2003 Microchip Technology Inc. DS21732B-page 1
MMCP3221
Features
• 12-bit resolution
• ±1 LSB DNL, ±2 LSB INL max.
• 250 µA max conversion current
• 5 nA typical standby current, 1 µA max.
•I2C™ compatible serial interface
- 100 kHz I2C Standard Mode
- 400 kHz I2C Fast Mode
• Up to 8 devices on a single 2-Wire bus
• 22.3 ksps in I2C Fast Mode
• Single-ended analog input channel
• On-chip sample and hold
• On-chip conversion clock
• Single-supply specified operation: 2.7V to 5.5V
• Temperature range:
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
• Small SOT-23 package
Applications
• Data Logging
• Multi-zone Monitoring
• Hand-Held Portable Applications
• Battery-Powered Test Equipment
• Remote or Isolated Data Acquisition
Package Type
Description
The Microchip Technology Inc. MCP3221 is a succes-
sive approximation A/D converter with 12-bit resolu-
tion. Available in the SOT-23 package, this device
provides one single-ended input with very low power
consumption. Based on an advanced CMOS technol-
ogy, the MCP3221 provides a low maximum conver-
sion current and standby current of 250 µA and 1 µA,
respectively. Low current consumption, combined with
the small SOT-23 package, make this device ideal for
battery-powered and remote data acquisition
applications.
Communication to the MCP3221 is performed using a
2-wire, I2C compatible interface. Standard (100 kHz)
and Fast (400 kHz) I2C modes are available with the
device. An on-chip conversion clock enables indepen-
dent timing for the I2C and conversion clocks. The
device is also addressable, allowing up to eight devices
on a single 2-wire bus.
The MCP3221 runs on a single supply voltage that
operates over a broad range of 2.7V to 5.5V. This
device also provides excellent linearity of ±1 LSB differ-
ential non-linearity and ±2 LSB integral non-linearity,
maximum.
Functional Block Diagram
5-Pin SOT-23A
SCL
AIN
MCP3221
1
2
3
5
SDA
VSS
VDD
4
Comparator
Sample
and
Hold
12-bit SAR
DAC
I2C™ Interface
AIN
VSS
VDD
SCL SDA
Clock
Control Logic
–
+
Low Power 12-Bit A/D Converter With I2C™ Interface
MCP3221
DS21732B-page 2 2003 Microchip Technology Inc.
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD...................................................................................7.0V
Analog input pin w.r.t. VSS.......... ............. -0.6V to VDD +0.6V
SDA and SCL pins w.r.t. VSS........... .........-0.6V to VDD +1.0V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-65°C to +125°C
Maximum Junction Temperature .......... .........................150°C
ESD protection on all pins (HBM) .................................≥ 4kV
† Stresses above those listed under “Maximum ratings” may
cause permanent damage to the device. This is a stress rating
only and functional operation of the device at those or any
other conditions above those indicated in the operational list-
ings of this specification is not implied. Exposure to maximum
rating conditions for extended periods may affect device reli-
ability.
PIN FUNCTION TABLE
Name Function
VDD +2.7V to 5.5V Power Supply
VSS Ground
AIN Analog Input
SDA Serial Data In/Out
SCL Serial Clock In
DC ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise noted, all parameters apply at VDD = 5.0V, VSS = GND, RPU = 2 kΩ
TAMB = -40°C to +85°C, I2C Fast Mode Timing: fSCL = 400 kHz (Note 3).
Parameters Sym Min Typ Max Units Conditions
DC Accuracy
Resolution 12 bits
Integral Nonlinearity INL — ±0.75 ±2 LSB
Differential Nonlinearity DNL — ±0.5 ±1 LSB No missing codes
Offset Error — ±0.75 ±2 LSB
Gain Error — -1 ±3 LSB
Dynamic Performance
Total Harmonic Distortion THD — -82 — dB VIN = 0.1V to 4.9V @ 1 kHz
Signal-to-Noise and Distortion SINAD — 72 — dB VIN = 0.1V to 4.9V @ 1 kHz
Spurious-Free Dynamic Range SFDR — 86 — dB VIN = 0.1V to 4.9V @ 1 kHz
Analog Input
Input Voltage Range VSS-0.3 — VDD+0.3 V 2.7V ≤ VDD ≤ 5.5V
Leakage Current -1 — +1 µA
SDA/SCL (open-drain output):
Data Coding Format Straight Binary
High-level input voltage VIH 0.7 VDD ——V
Low-level input voltage VIL — — 0.3 VDD V
Low-level output voltage VOL ——0.4VI
OL = 3 mA, RPU = 1.53 kΩ
Hysteresis of Schmitt trigger inputs VHYST —0.05V
DD —Vf
SCL = 400 kHz only
Note 1: “Sample time” is the time between conversions once the address byte has been sent to the converter.
Refer to Figure 5-6.
2: This parameter is periodically sampled and not 100% tested.
3: RPU = Pull-up resistor on SDA and SCL.
4: SDA and SCL = VSS to VDD at 400 kHz.
5: tACQ and tCONV are dependent on internal oscillator timing. See Figure 5-5 and Figure 5-6 for relation to
SCL.
2003 Microchip Technology Inc. DS21732B-page 3
MCP3221
TEMPERATURE SPECIFICATIONS
Input leakage current ILI -1 — +1 µA VIN = 0.1 VDD and 0.9 VDD
Output leakage current ILO -1 — +1 µA VOUT = 0.1 VSS and 0.9 VDD
Pin capacitance
(all inputs/outputs)
CIN,
COUT
— — 10 pF TAMB = 25°C, f = 1 MHz;
(Note 2)
Bus Capacitance CB— — 400 pF SDA drive low, 0.4V
Power Requirements
Operating Voltage VDD 2.7 — 5.5 V
Conversion Current IDD — 175 250 µA
Standby Current IDDS — 0.005 1 µA SDA, SCL = VDD
Active bus current IDDA — — 120 µA Note 4
Conversion Rate
Conversion Time tCONV —8.96—µsNote 5
Analog Input Acquisition Time tACQ —1.12—µsNote 5
Sample Rate fSAMP — — 22.3 ksps fSCL = 400 kHz (Note 1)
Electrical Characteristics: Unless otherwise noted, all parameters apply at VDD = 5.0V, VSS = GND.
Parameters Symbol Min Typ Max Units Conditions
Temperature Ranges
Industrial Temperature Range TA-40 — +85 °C
Extended Temperature Range TA-40 — +125 °C
Operating Temperature Range TA-40 — +125 °C
Storage Temperature Range TA-65 — +150 °C
Thermal Package Resistances
Thermal Resistance, 5L-SOT23A θJA —256 —°C/W
DC ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise noted, all parameters apply at VDD = 5.0V, VSS = GND, RPU = 2 kΩ
TAMB = -40°C to +85°C, I2C Fast Mode Timing: fSCL = 400 kHz (Note 3).
Parameters Sym Min Typ Max Units Conditions
Note 1: “Sample time” is the time between conversions once the address byte has been sent to the converter.
Refer to Figure 5-6.
2: This parameter is periodically sampled and not 100% tested.
3: RPU = Pull-up resistor on SDA and SCL.
4: SDA and SCL = VSS to VDD at 400 kHz.
5: tACQ and tCONV are dependent on internal oscillator timing. See Figure 5-5 and Figure 5-6 for relation to
SCL.
MCP3221
DS21732B-page 4 2003 Microchip Technology Inc.
TIMING SPECIFICATIONS
FIGURE 1-1: Standard and Fast Mode Bus Timing Data.
Electrical Characteristics: All parameters apply at VDD = 2.7V - 5.5V, VSS = GND, TAMB = -40°C to +85°C.
Parameters Sym Min Typ Max Units Conditions
I2C Standard Mode
Clock frequency fSCL 0 — 100 kHz
Clock high time THIGH 4000 — — ns
Clock low time TLOW 4700 — — ns
SDA and SCL rise time TR— — 1000 ns From VIL to VIH (Note 1)
SDA and SCL fall time TF— — 300 ns From VIL to VIH (Note 1)
START condition hold time THD:STA 4000 — — ns
START condition setup time TSU:STA 4700 — — ns
Data input setup time TSU:DAT 250 — — ns
STOP condition setup time TSU:STO 4000 — — ns
STOP condition hold time THD:STD 4000 — — ns
Output valid from clock TAA — — 3500 ns
Bus free time TBUF 4700 — — ns Note 2
Input filter spike suppression TSP — — 50 ns SDA and SCL pins (Note 1)
I2C Fast Mode
Clock frequency FSCL 0 — 400 kHz
Clock high time THIGH 600 — — ns
Clock low time TLOW 1300 — — ns
SDA and SCL rise time TR20 + 0.1CB— 300 ns From VIL to VIH (Note 1)
SDA and SCL fall time TF20 + 0.1CB— 300 ns From VIL to VIH (Note 1)
START condition hold time THD:STA 600 — — ns
START condition setup time TSU:STA 600 — — ns
Data input hold time THD:DAT 0—0.9ms
Data input setup time TSU:DAT 100 — — ns
STOP condition setup time TSU:STO 600 — — ns
STOP condition hold time THD:STD 600 — — ns
Output valid from clock TAA — — 900 ns
Bus free time TBUF 1300 — — ns Note 2
Input filter spike suppression TSP — — 50 ns SDA and SCL pins (Note 1)
Note 1: This parameter is periodically sampled and not 100% tested.
2: Time the bus must be free before a new transmission can start.
TF
THIGH VHYS TR
TSU:STA
TSP
THD:STA
TLOW THD:DAT TSU:DAT TSU:STO
TBUF
TAA
SCL
SDA
IN
SDA
OUT
2003 Microchip Technology Inc. DS21732B-page 5
MCP3221
2.0 TYPICAL PERFORMANCE CURVES
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-1: INL vs. Clock Rate.
FIGURE 2-2: INL vs. VDD - I2C™
Standard Mode (fSCL = 100 kHz).
FIGURE 2-3: INL vs. Code
(Representative Part).
FIGURE 2-4: INL vs. Clock Rate
(VDD =2.7V).
FIGURE 2-5: INL vs. VDD - I2C™ Fast
Mode (fSCL = 400 kHz).
FIGURE 2-6: INL vs. Code
(Representative Part, VDD = 2.7V).
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 100 200 300 400
I2C Bus Rate (kHz)
INL (LSB)
Positive INL
Negative INL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
2.533.544.555.5
VDD (V)
INL (LSB)
Positive INL
Negative INL
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0 1024 2048 3072 4096
Digital Code
INL (LSB)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 100 200 300 400
I2C Bus Rate (kHz)
INL (LSB)
Positive INL
Negative INL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
2.533.544.555.5
VDD (V)
INL (LSB)
Positive INL
Negative INL
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0 1024 2048 3072 4096
Digital Code
INL (LSB)
MCP3221
DS21732B-page 6 2003 Microchip Technology Inc.
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-7: INL vs. Temperature.
FIGURE 2-8: DNL vs. Clock Rate.
FIGURE 2-9: DNL vs. VDD - I2C™
Standard Mode (fSCL = 100 kHz).
FIGURE 2-10: INL vs. Temperature
(VDD =2.7V).
FIGURE 2-11: DNL vs. Clock Rate
(VDD =2.7V).
FIGURE 2-12: DNL vs. VDD - I2C™ Fast
Mode (fSCL = 400 kHz).
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-50-25 0 255075100125
Temperature (°C)
INL (LSB)
Positive INL
Negative INL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 100 200 300 400
I2C Bus Rate (kHz)
DNL (LSB)
Positive DNL
Negative DNL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
2.5 3.5 4.5 5.5
VDD (V)
DNL (LSB)
Positive DNL
Negative DNL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-50-25 0 255075100125
Temperature (°C)
INL (LSB)
Negative INL
Positive INL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 100 200 300 400
I2C Bus Rate (kHz)
DNL (LSB)
Negative DNL
Positive DNL
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
2.533.544.555.5
VDD (V)
DNL (LSB)
Positive DNL
Negative DNL
2003 Microchip Technology Inc. DS21732B-page 7
MCP3221
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-13: DNL vs. Code
(Representative Part).
FIGURE 2-14: DNL vs. Temperature.
FIGURE 2-15: Gain Error vs. VDD.
FIGURE 2-16: DNL vs. Code
(Representative Part, VDD = 2.7V).
FIGURE 2-17: DNL vs. Temperature
(VDD =2.7V).
FIGURE 2-18: Offset Error vs. VDD.
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 1024 2048 3072 4096
Digital Code
DNL (LSB)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-50-25 0 255075100125
Temperature (°C)
DNL (LSB)
Negative DNL
Positive DNL
-1
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
2.533.544.555.5
VDD (V)
Gain Error (LSB)
Fast Mode
(fSCL=100 kHz) Standard Mode
(fSCL=400 kHz)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 1024 2048 3072 4096
Digital Code
DNL (LSB)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-50-25 0 255075100125
Temperature (°C)
DNL (LSB)
Positive DNL
Negative DNL
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2.533.544.555.5
VDD (V)
Offset Error (LSB)
fSCL = 100 kHz & 400 kHz
MCP3221
DS21732B-page 8 2003 Microchip Technology Inc.
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-19: Gain Error vs. Temperature.
FIGURE 2-20: SNR vs. Input Frequency.
FIGURE 2-21: THD vs. Input Frequency.
FIGURE 2-22: Offset Error vs.
Temperature.
FIGURE 2-23: SINAD vs. Input Frequency.
FIGURE 2-24: SINAD vs. Input Signal
Level.
-3
-2
-1
0
1
2
3
-50 -25 0 25 50 75 100 125
Temperature (°C)
Gain Error (LSB)
VDD = 5V
VDD = 2.7V
0
10
20
30
40
50
60
70
80
90
100
110
Input Frequency (kHz)
SNR (dB)
VDD = 5V
VDD = 2.7V
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
110
Input Frequency (kHz)
THD (dB)
VDD = 2.7V
VDD = 5V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
-50 -25 0 25 50 75 100 125
Temperature (°C)
Offset Error (LSB)
VDD = 5V
VDD = 2.7V
0
10
20
30
40
50
60
70
80
90
100
110
Input Frequency (kHz)
SINAD (dB)
VDD = 5V
VDD = 2.7V
0
10
20
30
40
50
60
70
80
-40 -30 -20 -10 0
Input Signal Level (dB)
SINAD (dB)
VDD = 5V
VDD = 2.7V
2003 Microchip Technology Inc. DS21732B-page 9
MCP3221
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-25: ENOB vs. VDD.
FIGURE 2-26: SFDR vs. Input Frequency.
FIGURE 2-27: Spectrum Using I2C™ Fast
Mode (Representative Part, 1 kHz Input
Frequency).
FIGURE 2-28: ENOB vs. Input Frequency.
FIGURE 2-29: Spectrum Using I2C™
Standard Mode (Representative Part, 1 kHz
Input Frequency).
FIGURE 2-30: IDD (Conversion) vs. VDD.
11.5
11.55
11.6
11.65
11.7
11.75
11.8
11.85
11.9
11.95
12
2.5 3 3.5 4 4.5 5 5.5
VDD (V)
ENOB (rms)
0
10
20
30
40
50
60
70
80
90
100
110
Input Frequency (kHz)
SFDR (dB)
VDD = 2.7V
VDD = 5V
-130
-110
-90
-70
-50
-30
-10
10
0 2000 4000 6000 8000 10000
Frequency (Hz)
Amplitude (dB)
9
9.5
10
10.5
11
11.5
12
110
Input Frequency (kHz)
ENOB (rms)
VDD = 2.7V
VDD = 5V
-130
-110
-90
-70
-50
-30
-10
10
0 500 1000 1500 2000 2500
Frequency (Hz)
Amplitude (dB)
fSAMP = 5.6 ksps
0
50
100
150
200
250
2.5 3 3.5 4 4.5 5 5.5
VDD (V)
IDD (µA)
MCP3221
DS21732B-page 10 2003 Microchip Technology Inc.
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-31: IDD (Conversion) vs. Clock
Rate.
FIGURE 2-32: IDD (Conversion) vs.
Temperature.
FIGURE 2-33: IDDA (Active Bus) vs. VDD.
FIGURE 2-34: IDDA (Active Bus) vs. Clock
Rate.
FIGURE 2-35: IDDA (Active Bus) vs.
Temperature.
FIGURE 2-36: IDDS (Standby) vs. VDD.
0
20
40
60
80
100
120
140
160
180
200
0 100 200 300 400
I2C Clock Rate (kHz)
IDD (µA)
VDD = 5V
VDD = 2.7V
0
50
100
150
200
250
-50 -25 0 25 50 75 100 125
Temperature (°C)
IDD (µA)
VDD = 5V
VDD = 2.7V
0
10
20
30
40
50
60
70
80
90
100
2.533.544.555.5
VDD (V)
IDDA (µA)
0
10
20
30
40
50
60
70
80
90
100
0 100 200 300 400
I2C Clock Rate (kHz)
IDDA (µA)
VDD = 5V
VDD = 2.7V
0
10
20
30
40
50
60
70
80
90
100
-50 -25 0 25 50 75 100 125
Temperature (°C)
IDDA (µA)
VDD = 5V
VDD = 2.7V
0
10
20
30
40
50
60
2.533.544.555.5
VDD (V)
IDDS (pA)
2003 Microchip Technology Inc. DS21732B-page 11
MCP3221
Note: Unless otherwise indicated, VDD = 5V, VSS = 0V, I2C Fast Mode Timing (SCL = 400 kHz), Continuous Conversion
Mode (fSAMP = 22.3 ksps), TA = +25°C.
FIGURE 2-37: IDDS (Standby) vs.
Temperature.
FIGURE 2-38: Analog Input Leakage vs.
Temperature.
2.1 Test Circuits
FIGURE 2-39: Typical Test Configuration.
0.0001
0.001
0.01
0.1
1
10
100
1000
-50-25 0 255075100125
Temperature (°C)
IDDS (nA)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
-50-250 255075100125
Temperature (°C)
Analog Input Leakage (nA)
0.1 µF
AIN MCP3221
VDD = 5V
VCM = 2.5V
VIN
VDD
VSS
10 µF
SDA
SCL
2kΩ2kΩ
MCP3221
DS21732B-page 12 2003 Microchip Technology Inc.
3.0 PIN FUNCTIONS
TABLE 3-1: PIN FUNCTION TABLE
3.1 VDD and VSS
The VDD pin, with respect to VSS, provides power to the
device as well as a voltage reference for the conversion
process. Refer to Section 6.4, “Device Power and
Layout Considerations”, for tips on power and
grounding.
3.2 Analog Input (AIN)
AIN is the input pin to the sample-and-hold circuitry of
the Successive Approximation Register (SAR) con-
verter. Care should be taken in driving this pin. Refer to
Section 6.1, “Driving the Analog Input”. For proper con-
versions, the voltage on this pin can vary from VSS to
VDD.
3.3 Serial Data (SDA)
SDA is a bidirectional pin used to transfer addresses
and data into and out of the device. Since it is an open-
drain terminal, the SDA bus requires a pull-up resistor
to VDD (typically 10 kΩ for 100 kHz and 2 kΩ for
400 kHz SCL clock speeds). Refer to Section 6.2,
“Connecting to the I2C Bus”, for more information.
For normal data transfer, SDA is allowed to change only
during SCL low. Changes during SCL high are reserved
for indicating the START and STOP conditions. Refer to
Section 5.1, “I2C Bus Characteristics”.
3.4 Serial Clock (SCL)
SCL is an input pin used to synchronize the data trans-
fer to and from the device on the SDA pin and is an
open-drain terminal. Therefore, the SCL bus requires a
pull-up resistor to VDD (typically 10 kΩ for 100 kHz and
2kΩ for 400 kHz SCL clock speeds. Refer to
Section 6.2, “Connecting to the I2C Bus”).
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating the START and STOP
conditions. Refer to Section 6.1, “Driving the Analog
Input”.
Name Function
VDD +2.7V to 5.5V Power Supply
VSS Ground
AIN Analog Input
SDA Serial Data In/Out
SCL Serial Clock In
2003 Microchip Technology Inc. DS21732B-page 13
MCP3221
4.0 DEVICE OPERATION
The MCP3221 employs a classic SAR architecture.
This architecture uses an internal sample and hold
capacitor to store the analog input while the conversion
is taking place. At the end of the acquisition time, the
input switch of the converter opens and the device uses
the collected charge on the internal sample-and-hold
capacitor to produce a serial 12-bit digital output code.
The acquisition time and conversion is self-timed using
an internal clock. After each conversion, the results are
stored in a 12-bit register that can be read at any time.
Communication with the device is accomplished with a
2-wire, I2C interface. Maximum sample rates of
22.3 ksps are possible with the MCP3221 in a continu-
ous-conversion mode and an SCL clock rate of
400 kHz.
4.1 Digital Output Code
The digital output code produced by the MCP3221 is a
function of the input signal and power supply voltage,
VDD. As the VDD level is reduced, the LSB size is
reduced accordingly. The theoretical LSB size is shown
below.
EQUATION
The output code of the MCP3221 is transmitted serially
with MSB first. The format of the code is straight binary.
4.2 Conversion Time (tCONV)
The conversion time is the time required to obtain the
digital result once the analog input is disconnected
from the holding capacitor. With the MCP3221, the
specified conversion time is typically 8.96 µs. This time
is dependent on the internal oscillator and is
independent of SCL.
4.3 Acquisition Time (tACQ)
The acquisition time is the amount of time the sample
cap array is acquiring charge.
The acquisition time is, typically, 1.12 µs. This time is
dependent on the internal oscillator and independent of
SCL.
4.4 Sample Rate
Sample rate is the inverse of the maximum amount of
time that is required from the point of acquisition of the
first conversion to the point of acquisition of the second
conversion.
The sample rate can be measured either by single or
continuous conversions. A single conversion includes
a Start Bit, Address Byte, Two Data Bytes and a Stop
bit. This sample rate is measured from one Start Bit to
the next Start Bit.
For continuous conversions (requested by the Master
by issuing an acknowledge after a conversion), the
maximum sample rate is measured from conversion to
conversion or a total of 18 clocks (two data bytes and
two Acknowledge bits). Refer to Section 5-2, “Device
Addressing”.
FIGURE 4-1: Transfer Function.
LSB SIZE
VDD
4096
------------
=
VDD = Supply voltage
1111 1111 1111 (4095)
1111 1111 1110 (4094)
AIN
0000 0000 0001 (1)
0000 0000 0011 (3)
Output Code
VDD-1.5 LSB
.5 LSB
1.5 LSB VDD-2.5 LSB
2.5 LSB
0000 0000 0000 (0)
0000 0000 0010 (2)
MCP3221
DS21732B-page 14 2003 Microchip Technology Inc.
4.5 Differential Non-Linearity (DNL)
In the ideal A/D converter transfer function, each code
has a uniform width. That is, the difference in analog
input voltage is constant from one code transition point
to the next. Differential nonlinearity (DNL) specifies the
deviation of any code in the transfer function from an
ideal code width of 1 LSB. The DNL is determined by
subtracting the locations of successive code transition
points after compensating for any gain and offset
errors. A positive DNL implies that a code is longer than
the ideal code width, while a negative DNL implies that
a code is shorter than the ideal width.
4.6 Integral Non-Linearity (INL)
Integral nonlinearity (INL) is a result of cumulative DNL
errors and specifies how much the overall transfer
function deviates from a linear response. The method
of measurement used in the MCP3221 A/D converter
to determine INL is the “end-point” method.
4.7 Offset Error
Offset error is defined as a deviation of the code transi-
tion points that are present across all output codes.
This has the effect of shifting the entire A/D transfer
function. The offset error is measured by finding the dif-
ference between the actual location of the first code
transition and the desired location of the first transition.
The ideal location of the first code transition is located
at 1/2 LSB above VSS.
4.8 Gain Error
The gain error determines the amount of deviation from
the ideal slope of the A/D converter transfer function.
Before the gain error is determined, the offset error is
measured and subtracted from the conversion result.
The gain error can then be determined by finding the
location of the last code transition and comparing that
location to the ideal location. The ideal location of the
last code transition is 1.5 LSBs below full-scale or VDD.
4.9 Conversion Current (IDD)
The average amount of current over the time required
to perform a 12-bit conversion.
4.10 Active Bus Current (IDDA)
The average amount of current over the time required
to monitor the I2C bus. Any current the device con-
sumes while it is not being addressed is referred to as
“Active Bus” current.
4.11 Standby Current (IDDS)
The average amount of current required while no con-
version is occurring and while no data is being output
(i.e., SCL and SDA lines are quiet).
4.12 I2C Standard Mode Timing
I2C specification where the frequency of SCL is
100 kHz.
4.13 I2C Fast Mode Timing
I2C specification where the frequency of SCL is
400 kHz.
2003 Microchip Technology Inc. DS21732B-page 15
MCP3221
5.0 SERIAL COMMUNICATIONS
5.1 I2C Bus Characteristics
The following bus protocol has been defined:
• Data transfer may be initiated only when the bus
is not busy.
• During data transfer, the data line must remain
stable whenever the clock line is high. Changes in
the data line while the clock line is high will be
interpreted as a START or STOP condition.
Accordingly, the following bus conditions have been
defined (refer to Figure 5-1).
5.1.1 BUS NOT BUSY (A)
Both data and clock lines remain high.
5.1.2 START DATA TRANSFER (B)
A high-to-low transition of the SDA line while the clock
(SCL) is high determines a START condition. All
commands must be preceded by a START condition.
5.1.3 STOP DATA TRANSFER (C)
A low-to-high transition of the SDA line while the clock
(SCL) is high determines a STOP condition. All
operations must be ended with a STOP condition.
5.1.4 DATA VALID (D)
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the clock signal’s high period.
The data on the line must be changed during the low
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a START condition
and terminated with a STOP condition. The number of
data bytes transferred between the START and STOP
conditions is determined by the master device and is
unlimited.
5.1.5 ACKNOWLEDGE
Each receiving device, when addressed, is obliged to
generate an acknowledge bit after the reception of
each byte. The master device must generate an extra
clock pulse which is associated with this acknowledge
bit.
The device that acknowledges has to pull down the
SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable-low during the high
period of the acknowledge-related clock pulse. Setup
and hold times must be taken into account. During
reads, a master device must signal an end of data to
the slave by not generating an acknowledge bit on the
last byte that has been clocked out of the slave (NAK).
In this case, the slave (MCP3221) will release the bus
to allow the master device to generate the STOP
condition.
The MCP3221 supports a bidirectional, 2-wire bus and
data transmission protocol. The device that sends data
onto the bus is the transmitter and the device receiving
data is the receiver. The bus has to be controlled by a
master device which generates the serial clock (SCL),
controls the bus access and generates the START and
STOP conditions, while the MCP3221 works as a slave
device. Both master and slave devices can operate as
either transmitter or receiver, but the master device
determines which mode is activated.
FIGURE 5-1: Data Transfer Sequence on the Serial Bus.
SCL
SDA
(A) (B) (D) (D) (A)(C)
START
CONDITION
ADDRESS OR
ACKNOWLEDGE
VALID
DATA
ALLOWED
TO CHANGE
STOP
CONDITION
MCP3221
DS21732B-page 16 2003 Microchip Technology Inc.
5.2 Device Addressing
The address byte is the first byte received following the
START condition from the master device. The first part
of the control byte consists of a 4-bit device code,
which is set to 1010 for the MCP3221. The device code
is followed by three address bits: A2, A1 and A0. The
default address bits are 1001. Contact the Microchip
factory for additional address bit options. The address
bits allow up to eight MCP3221 devices on the same
bus and are used to determine which device is
accessed.
The eighth bit of the slave address determines if the
master device wants to read conversion data or write to
the MCP3221. When set to a ‘1’, a read operation is
selected. When set to a ‘0’, a write operation is
selected. There are no writable registers on the
MCP3221. Therefore, this bit must be set to a ’1’ in
order to initiate a conversion.
The MCP3221 is a slave device that is compatible with
the I2C 2-wire serial interface protocol. A hardware
connection diagram is shown in Figure 6-2. Communi-
cation is initiated by the microcontroller (master
device), which sends a START bit followed by the
address byte.
On completion of the conversion(s) performed by the
MCP3221, the microcontroller must send a STOP bit to
end communication.
The last bit in the device address byte is the R/W bit.
When this bit is a logic ‘1’, a conversion will be exe-
cuted. Setting this bit to logic ‘0’ will also result in an
“acknowledge” (ACK) from the MCP3221, with the
device then releasing the bus. This can be used for
device polling. Refer to Section 6.3, “Device Polling”,
for more information.
FIGURE 5-2: Device Addressing.
5.3 Executing a Conversion
This section will describe the details of communicating
with the MCP3221 device. Initiating the sample-and-
hold acquisition, reading the conversion data and
executing multiple conversions will be discussed.
5.3.1 INITIATING THE SAMPLE AND
HOLD
The acquisition and conversion of the input signal
begins with the falling edge of the R/W bit of the
address byte. At this point, the internal clock initiates
the sample, hold and conversion cycle, all of which are
internal to the ADC.
FIGURE 5-3: Initiating the Conversion,
Address Byte.
FIGURE 5-4: Initiating the Conversion,
Continuous Conversions.
START READ/WRITE
SLAVE ADDRESS R/W A
1001101
Address Bits(1)
Note 1: Contact Microchip for additional address bits.
Device Code
123456789
SCL
SDA 1 0 0 1 A2 A1 A0 R/W
ACK
Start
Bit
Address Byte
Address bits Device bits
tACQ + tCONV is
initiated here
SCL
SDA D3 D2 D2
ACK
Lower Data Byte (n)
tACQ + tCONV is
initiated here
D6 D5 D4 D0D7
ACK
D8
17 18 19 20 21 22 23 24 25 26
2003 Microchip Technology Inc. DS21732B-page 17
MCP3221
The input signal will initially be sampled with the first
falling edge of the clock following the transmission of a
logic-high R/W bit. Additionally, with the rising edge of
the SCL, the ADC will transmit an acknowledge bit
(ACK = 0). The master must release the data bus dur-
ing this clock pulse to allow the MCP3221 to pull the
line low (refer to Figure 5-3).
For consecutive samples, sampling begins on the fall-
ing edge of the LSB of the conversion result, which is
two bytes long. Refer to Figure 5-6 a for timing diagram.
5.3.2 READING THE CONVERSION DATA
Once the MCP3221 acknowledges the address byte,
the device will transmit four ‘0’ bits followed by the upper
four data bits of the conversion. The master device will
then acknowledge this byte with an ACK = Low. With the
following 8 clock pulses, the MCP3221 will transmit the
lower eight data bits from the conversion. The master
then sends an ACK = high, indicating to the MCP3221
that no more data is requested. The master can then
send a stop bit to end the transmission.
FIGURE 5-5: Executing a Conversion.
5.3.3 CONSECUTIVE CONVERSIONS
For consecutive samples, sampling begins on the fall-
ing edge of the LSB of the conversion result. See
Figure 5-6 for timing.
FIGURE 5-6: Continuous Conversion.
SDA
S
T
A
R
T
S
T
O
P
A
C
K
tACQ + tCONV is
initiated here
Address Byte
Address bits
Device bits
1001AR
/
W
Upper Data Byte
0000
DDDA
C
K
Lower Data Byte
N
A
K
S P
11 10
2
A
1
A
09
D
8
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
12345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
SCL
SDA
fSAMP = 22.3 ksps (fCLK = 400 kHz)
A
C
K
tACQ + tCONV is
initiated here
Address Byte
Address bits
Device bits
1 0 0 1 A2 A1 A0 R
/
W
Upper Data Byte (n)
A
C
K
Lower Data Byte (n)
A
C
K
S
tACQ + tCONV is
initiated here
0000
DDD
11 10 9
D
8
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
12345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
SCL
S
T
A
R
T
0
28
MCP3221
DS21732B-page 18 2003 Microchip Technology Inc.
6.0 APPLICATIONS INFORMATION
6.1 Driving the Analog Input
The MCP3221 has a single-ended analog input (AIN).
For proper conversion results, the voltage at the AIN
pin must be kept between VSS and VDD. If the converter
has no offset error, gain error, INL or DNL errors, and
the voltage level of AIN is equal to or less than
VSS + 1/2 LSB, the resultant code will be 000h. Addi-
tionally, if the voltage at AIN is equal to or greater than
VDD - 1.5 LSB, the output code will be FFFh.
The analog input model is shown in Figure 6-1. In this
diagram, the source impedance (RSS) adds to the inter-
nal sampling switch (RS) impedance, directly affecting
the time required to charge the capacitor (CSAMPLE).
Consequently, a larger source impedance increases
the offset error, gain error and integral linearity errors of
the conversion. Ideally, the impedance of the signal
source should be near zero. This is achievable with an
operational amplifier, such as the MCP6022, which has
a closed-loop output impedance of tens of ohms.
FIGURE 6-1: Analog Input Model, AIN.
6.2 Connecting to the I2C Bus
The I2C bus is an open-collector bus, requiring pull-up
resistors connected to the SDA and SCL lines. This
configuration is shown in Figure 6-2.
FIGURE 6-2: Pull-up Resistors on I2C
Bus.
The number of devices connected to the bus is limited
only by the maximum bus capacitance of 400 pF. A
possible configuration using multiple devices is shown
in Figure 6-3.
FIGURE 6-3: Multiple Devices on I2C™
Bus.
CPIN
VA
RSS AIN
7pF
VT = 0.6V
VT = 0.6V ILEAKAGE
Sampling
Switch
SS RS = 1 kΩ
CSAMPLE
= DAC capacitance
VSS
VDD
= 20 pF
±1 nA
Legend
VA = signal source
RSS = source impedance
AIN = analog input pad
CPIN = analog input pin capacitance
VT= threshold voltage
ILEAKAGE = leakage current at the pin
due to various junctions
SS = sampling switch
RS= sampling switch resistor
CSAMPLE = sample/hold capacitance
PICmicro®
SDA
SCL
VDD
RPU
RPU
RPU is typically: 10 kΩ for fSCL = 100 kHz
2kΩ for fSCL = 400 kHz
MCP3221
Analog
Input
Signal
Microcontroller
AIN
SDA SCL
PIC16F876
Microcontroller
MCP3221
12-bit ADC
TC74
Temperature
Sensor
24LC01
EEPROM
2003 Microchip Technology Inc. DS21732B-page 19
MCP3221
6.3 Device Polling
In some instances, it may be necessary to test for
MCP3221 presence on the I2C bus without performing
a conversion. This operation is described in Figure 6-4.
Here we are setting the R/W bit in the address byte to
a zero. The MCP3221 will then acknowledge by pulling
SDA low during the ACK clock and then release the
bus back to the I2C master. A stop or repeated start bit
can then be issued from the master and I2C
communication can continue.
FIGURE 6-4: Device Polling.
6.4 Device Power and Layout
Considerations
6.4.1 POWERING THE MCP3221
VDD supplies the power to the device as well as the ref-
erence voltage. A bypass capacitor value of 0.1 µF is
recommended. Adding a 10 µF capacitor in parallel is
recommended to attenuate higher frequency noise
present in some systems.
FIGURE 6-5: Powering the MCP3221.
6.4.2 LAYOUT CONSIDERATIONS
When laying out a printed circuit board for use with
analog components, care should be taken to reduce
noise wherever possible. A bypass capacitor from VDD
to ground should always be used with this device and
should be placed as close as possible to the device pin.
A bypass capacitor value of 0.1 µF is recommended.
Digital and analog traces should be separated as much
as possible on the board, with no traces running under-
neath the device or the bypass capacitor. Extra precau-
tions should be taken to keep traces with high-
frequency signals (such as clock lines) as far as
possible from analog traces.
Use of an analog ground plane is recommended in
order to keep the ground potential the same for all
devices on the board. Providing VDD connections to
devices in a “star” configuration can also reduce noise
by eliminating current return paths and associated
errors (Figure 6-6). For more information on layout tips
when using the MCP3221 or other ADC devices, refer
to AN688, “Layout Tips for 12-Bit A/D Converter
Applications”.
FIGURE 6-6: VDD traces arranged in a
‘Star’ configuration in order to reduce errors
caused by current return paths.
6.4.3 USING A REFERENCE FOR
SUPPLY
The MCP3221 uses VDD as both power and a refer-
ence. In some applications, it may be necessary to use
a stable reference to achieve the required accuracy.
Figure 6-7 shows an example using the MCP1541 as a
4.096V, 2% reference.
FIGURE 6-7: Stable Power and
Reference Configuration.
123456789
SCL
SDA 100
1A2 A1A0 0
ACK
Start
Bit
Address Byte
Address bits
Device bits R/W Start
Bit
MCP3221 response
VDD
VDD
AIN
SCL
SDA
To
Microcontroller
10 µF
MCP3221
0.1 µF
VDD
RPU
RPU
VDD
Connection
Device 1
Device 2
Device 3
Device 4
VDD
VDD
4.096V
Reference
1µF
0.1 µF
MCP1541 CL
AIN
To
Microcontroller
MCP3221
VDD
RPU
SCL
SDA
MCP3221
DS21732B-page 20 2003 Microchip Technology Inc.
7.0 PACKAGING INFORMATION
7.1 Package Marking Information
*Standard device marking consists of Microchip part number, year code, week code, and traceability
code.
2 13
54
5-Pin SOT-23A (EIAJ SC-74) Device
cdef
Legend: 1 Part Number code + temperature range
2 Part Number code + temperature range
3 Year and work week
4 Lot ID
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line thus limiting the number of available characters
for customer specific information.
Part Number Address Option SOT-23
MCP3221A0T-I/OT 000 EE
MCP3221A1T-I/OT 001 EH
MCP3221A2T-I/OT 010 EB
MCP3221A3T-I/OT 011 EC
MCP3221A4T-I/OT 100 ED
MCP3221A5T-I/OT 101 S1 *
MCP3221A6T-I/OT 110 EF
MCP3221A7T-I/OT 111 EG
MCP3221A0T-E/OT 000 GE
MCP3221A1T-E/OT 001 GH
MCP3221A2T-E/OT 010 GB
MCP3221A3T-E/OT 011 GC
MCP3221A4T-E/OT 100 GD
MCP3221A5T-E/OT 101 GA *
MCP3221A6T-E/OT 110 GF
MCP3221A7T-E/OT 111 GG
* Default option. Contact Microchip Factory for other
address options.
2003 Microchip Technology Inc. DS21732B-page 21
MCP3221
5-Lead Plastic Small Outline Transistor (OT) (SOT23)
10501050
β
Mold Draft Angle Bottom
10501050
α
Mold Draft Angle Top
0.500.430.35.020.017.014BLead Width
0.200.150.09.008.006.004
c
Lead Thickness
10501050
φ
Foot Angle
0.550.450.35.022.018.014LFoot Length
3.102.952.80.122.116.110DOverall Length
1.751.631.50.069.064.059E1Molded Package Width
3.002.802.60.118.110.102EOverall Width
0.150.080.00.006.003.000
A1
Standoff §
1.301.100.90.051.043.035A2Molded Package Thickness
1.451.180.90.057.046.035AOverall Height
1.90.075
p1
Outside lead pitch (basic)
0.95.038
p
Pitch
55
n
Number of Pins
MAXNOMMINMAXNOMMINDimension Limits
MILLIMETERSINCHES*Units
1
p
D
B
n
E
E1
L
c
β
φ
α
A2
A
A1
p1
* Controlling Parameter
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MO-178
Drawing No. C04-091
§ Significant Characteristic
MCP3221
DS21732B-page 22 2003 Microchip Technology Inc.
NOTES:
2003 Microchip Technology Inc. DS21732B-page 23
MCP3221
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Sales and Support
Device: MCP3221T: 12-Bit 2-Wire Serial A/D Converter
(Tape and Reel)
Temperature Range: I = -40°C to +85°C
E= -40°C to +125°C
Address Options: XX A2 A1 A0
A0 = 0 0 0
A1 = 0 0 1
A2 = 0 1 0
A3 = 0 1 1
A4 = 1 0 0
A5 * = 1 0 1
A6 = 1 1 0
A7 = 1 1 1
* Default option. Contact Microchip factory for other
address options
Package: OT = SOT-23, 5-lead (Tape and Reel)
PART NO. XXX
Address Temperature
Range
Device
Examples:
a) MCP3221A0T-I/OT: Industrial, A0 Address,
Tape and Reel
b) MCP3221A1T-I/OT: Industrial, A1 Address,
Tape and Reel
c) MCP3221A2T-I/OT: Industrial, A2 Address,
Tape and Reel
d) MCP3221A3T-I/OT: Industrial, A3 Address,
Tape and Reel
e) MCP3221A4T-I/OT: Industrial, A4 Address,
Tape and Reel
f) MCP3221A5T-I/OT: Industrial, A5 Address,
Tape and Reel
g) MCP3221A6T-I/OT: Industrial, A6 Address,
Tape and Reel
h) MCP3221A7T-I/OT: Industrial, A7 Address,
Tape and Reel
a) MCP3221A0T-E/OT: Extended, A0 Address,
Tape and Reel
b) MCP3221A1T-E/OT: Extended, A1 Address,
Tape and Reel
c) MCP3221A2T-E/OT: Extended, A2 Address,
Tape and Reel
d) MCP3221A3T-E/OT: Extended, A3 Address,
Tape and Reel
e) MCP3221A4T-E/OT: Extended, A4 Address,
Tape and Reel
f) MCP3221A5T-E/OT: Extended, A5 Address,
Tape and Reel
g) MCP3221A6T-E/OT: Extended, A6 Address,
Tape and Reel
h) MCP3221A7T-IE/OT: Extended, A7 Address,
Tape and Reel
/XX
Package
Options
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and
recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
MCP3221
DS21732B-page 24 2003 Microchip Technology Inc.
NOTES:
DS21732B-page 25 2003 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical
components in life support systems is not authorized except
with express written approval by Microchip. No licenses are
conveyed, implicitly or otherwise, under any intellectual
property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, MPLAB, PIC, PICmicro, PICSTART, PRO MATE and
PowerSmart are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL
and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
Accuron, Application Maestro, dsPICDEM, dsPICDEM.net,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-
Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
PICC, PICkit, PICDEM, PICDEM.net, PowerCal, PowerInfo,
PowerMate, PowerTool, rfLAB, rfPIC, Select Mode,
SmartSensor, SmartShunt, SmartTel and Total Endurance are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2003, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21732B-page 26 2003 Microchip Technology Inc.
M
AMERICAS
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com
Atlanta
3780 Mansell Road, Suite 130
Alpharetta, GA 30022
Tel: 770-640-0034 Fax: 770-640-0307
Boston
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848 Fax: 978-692-3821
Chicago
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 630-285-0071 Fax: 630-285-0075
Dallas
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924
Detroit
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Kokomo
2767 S. Albright Road
Kokomo, IN 46902
Tel: 765-864-8360 Fax: 765-864-8387
Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
Phoenix
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7966 Fax: 480-792-4338
San Jose
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
Toronto
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
ASIA/PACIFIC
Australia
Microchip Technology Australia Pty Ltd
Marketing Support Division
Suite 22, 41 Rawson Street
Epping 2121, NSW
Australia
Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
China - Beijing
Microchip Technology Consulting (Shanghai)
Co., Ltd., Beijing Liaison Office
Unit 915
Bei Hai Wan Tai Bldg.
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: 86-10-85282100 Fax: 86-10-85282104
China - Chengdu
Microchip Technology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401-2402, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: 86-28-86766200 Fax: 86-28-86766599
China - Fuzhou
Microchip Technology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: 86-591-7503506 Fax: 86-591-7503521
China - Hong Kong SAR
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
China - Shanghai
Microchip Technology Consulting (Shanghai)
Co., Ltd.
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1812, 18/F, Building A, United Plaza
No. 5022 Binhe Road, Futian District
Shenzhen 518033, China
Tel: 86-755-82901380 Fax: 86-755-8295-1393
China - Qingdao
Rm. B505A, Fullhope Plaza,
No. 12 Hong Kong Central Rd.
Qingdao 266071, China
Tel: 86-532-5027355 Fax: 86-532-5027205
India
Microchip Technology Inc.
India Liaison Office
Marketing Support Division
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Japan
Microchip Technology Japan K.K.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Microchip Technology (Barbados) Inc.,
Taiwan Branch
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
EUROPE
Austria
Microchip Technology Austria GmbH
Durisolstrasse 2
A-4600 Wels
Austria
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45-4420-9895 Fax: 45-4420-9910
France
Microchip Technology SARL
Parc d’Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Steinheilstrasse 10
D-85737 Ismaning, Germany
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Italy
Microchip Technology SRL
Via Quasimodo, 12
20025 Legnano (MI)
Milan, Italy
Tel: 39-0331-742611 Fax: 39-0331-466781
United Kingdom
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44-118-921-5869 Fax: 44-118-921-5820
05/30/03
WORLDWIDE SALES AND SERVICE
