LM71QCIMF/NOPB - NATIONAL SEMICONDUCTOR

LM71

LM71/LM71Q SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor

Literature Number: SNIS125C

LM71/LM71Q

January 20, 2011

SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor

General Description

The LM71 is a low-power, high-resolution digital temperature

sensor with an SPI and MICROWIRE compatible interface,

available in the 5-pin SOT23 or the 6-pin LLP (no pull back)

package. The host can query the LM71 at any time to read

temperature. Its low operating current is useful in systems

where low power consumption is critical.

The LM71 has 13-bit plus sign temperature resolution

(0.03125°C per LSB) while operating over a temperature

range of −40°C to +150°C.

The LM71’s 2.65V to 5.5V supply voltage range, fast conver-

sion rate, low supply current, and simple SPI interface make

it ideal for a wide range of applications. The LM71Q is avail-

able in the 5-lead SOT23 package only.

Applications

■System Thermal Management

■Personal Computers

■Portable Electronic Devices

■Disk Drives

■Office Electronics

■Electronic Test Equipment

■Vending Machines

■Automotive

Features

■LM71Q is AEC-Q100 Grade 0 qualified and is

manufactured on an Automotive Grade Flow.

■SOT23-5 or No-Pull-Back LLP-6 Packages

■Operates over a full −40°C to +150°C range

■SPI and MICROWIRE Bus interface

Key Specifications

■ Supply Voltage 2.65V to 5.5V

■ Supply Current operating 300 µA (typ)

550 µA (max)

■ Temperature

Accuracy −10°C to +65°C ±1.5°C (max)

−40°C to 150°C +3/− 2°C (max)

■ Temperature

Resolution

31.25 m°C

Simplified Block Diagram

20031701

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

LM71/LM71Q SPI/MICROWIRE™ 13-Bit Plus Sign Temperature Sensor

Connection Diagrams

SOT23-5

20031702

TOP VIEW

NS Package Number MF05A

LLP-6 No Pull-Back

20031728

TOP VIEW

NS Package Number SDE06A

Ordering Information

Order

Number

Package

Marking

Package

Number

Supply

Voltage Transport Media Features

LM71CIMF T16C MF05A 2.65V to 5.5V 1000 Units in Tape and Reel

LM71CIMFX 3000 Units in Tape and Reel

LM71QCIMF

T16Q MF05A 2.65V to 5.5V

1000 Units in Tape and Reel AEC-Q100 Grade 0

Qualified;

Automotive Production

Flow

LM71QCIMFX 3000 Units in Tape and Reel

LM71CISD LM71C SDE06A 2.65V to 5.5V 1000 Units in Tape and Reel

LM71CISDX 4500 Units in Tape and Reel

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LM71/LM71Q

Pin Descriptions

Label Pin Number Function Typical Connection

SOT23-5 LLP-6

CS 1 4 Chip Select input From controller

GND 2 2, 5 Power Supply Ground Connect all GND Pins to ground

SI/O 3 3 Slave Input/Output - Serial bus bi-directional

data line. Shmitt trigger input. From and to controller

SC 4 1 Slave Clock - Serial bus clock Shmitt trigger

input line From controller

V+5 6 Positive Supply Voltage Input DC voltage from 2.65V to 5.5V. Bypass with

a 0.1 μF ceramic capacitor.

Typical Application

20031703

FIGURE 1. COP Microcontroller Interface

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LM71/LM71Q

Absolute Maximum Ratings (Note 1)

Supply Voltage −0.3V to 6.0V

Voltage at any Pin −0.3V to V+ + 0.3V

Input Current at any Pin (Note 2) 5 mA

Storage Temperature −65°C to +150°C

Soldering Information, Lead Temperature

SOT23-5 Package (Note 3)

Vapor Phase (60 seconds)

Infrared (15 seconds)

215°C

220°C

LLP-6 Package (Note 3)

Infrared (5 seconds) 215°C

ESD Susceptibility (Note 4)

Human Body Model

Machine Model

2000V

200V

Operating Ratings

Specified Temperature Range

(Note 5)TMIN to TMAX

LM71CIMF, LM71CISD,

LM71QCIMF −40°C to +150°C

Supply Voltage Range (+VS)

LM71CIMF, LM71CISD,

LM71QCIMF +2.65V to +5.5V

Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications

apply for V+ = 2.65V to 3.6V (Note 6). Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless

otherwise noted.

Parameter Conditions Typical

(Note 7)

LM71CIMF

LM71CISD

Limits

(Note 8)

Units

(Limit)

Temperature Error

(Note 6)

TA = −10°C to +65°C ±1.5 °C (max)

TA = −40°C to +85°C ±2.0 °C (max)

TA = −40°C to +150°C +3/−2 °C (max)

Resolution 14

0.03125 Bits

°C

Temperature Conversion

Time (Note 9) 200 270 ms (max)

Quiescent Current Serial Bus Inactive 300 550 μA (max)

Logic Electrical Characteristics

DIGITAL DC CHARACTERISTICS

Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V (Note 6). Boldface limits apply for TA = TJ = TMIN to

TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.

Symbol Parameter Conditions Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

VIN(1) Logical “1” Input Voltage V+ × 0.7 V (min)

V+ + 0.3 V (max)

VIN(0) Logical “0” Input Voltage −0.3 V (min)

V+ × 0.3 V (max)

Input Hysteresis Voltage V+ = 3.0V to 3.6V 0.4 0.33 V (min)

IIN(1) Logical “1” Input Current VIN = V+0.005 3.0 μA (max)

IIN(0) Logical “0” Input Current VIN = 0V −0.005 −3.0 μA (min)

CIN All Digital Inputs 20 pF

VOH High Level Output Voltage IOH = −400 μA 2.4 V (min)

VOL Low Level Output Voltage IOL = +2 mA 0.4 V (max)

IO_TRI-STATE TRI-STATE ®Output Leakage Current VO = GND

VO = V+

−1

μA (min)

μA (max)

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LM71/LM71Q

SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS

Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V (Note 6); CL (load capacitance) on output lines =

100 pF unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless

otherwise noted.

Symbol Parameter Conditions Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

t1SC (Clock) Period 0.16

μs (min)

(max)

t2CS Low to SC (Clock) High Set-Up Time 100 ns (min)

t3CS Low to Data Out (SO) Delay 70 ns (max)

t4SC (Clock) Low to Data Out (SO) Delay 70 ns (max)

t5CS High to Data Out (SO) TRI-STATE 200 ns (max)

t6SC (Clock) High to Data In (SI) Hold Time 50 ns (min)

t7Data In (SI) Set-Up Time to SC (Clock) High 30 ns (min)

trSC (Clock) Rise Time 100 ns (max)

tfSC (Clock) Fall Time 100 ns (max)

20031704

FIGURE 2. Data Output Timing Diagram

20031705

FIGURE 3. TRI-STATE Data Output Timing Diagram

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LM71/LM71Q

20031706

FIGURE 4. Data Input Timing Diagram

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating

the device beyond its rated operating conditions.

Note 2: When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > +VS) the current at that pin should be limited to 5 mA.

Note 3: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National

Semiconductor Linear Data Book for other methods of soldering surface mount devices.

Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.

Note 5: The life expectancy of the LM71 will be reduced when operating at elevated temperatures. LM71 θJA (thermal resistance, junction-to-ambient) when

attached to a printed circuit board with 2 oz. foil is summarized in the table below:

Device Number NS Package

Number

Thermal

Resistance (θJA)

LM71CIMF/LM71QCIMF MF05A 250°C/W

LM71CISD SDE06A 57.6°C/W

Note 6: The LM71 will operate properly over the V+ supply voltage range of 2.65V to 5.5V.

Note 7: Typicals are at TA = 25°C and represent most likely parametric norm.

Note 8: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).

Note 9: This specification is provided only to indicate how often temperature data is updated. The LM71 can be read at any time without regard to conversion

state (and will yield last conversion result). A conversion in progress will not be interrupted. The output shift register will be updated at the completion of the read

and a new conversion restarted.

Note 10: For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy with internal heating. This can cause an error of 0.64°C at

full rated sink current and saturation voltage based on junction-to-ambient thermal resistance.

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LM71/LM71Q

Electrical Characteristics

20031708

FIGURE 5. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)

TRI-STATE Test Circuit

20031707

FIGURE 6.

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LM71/LM71Q

Typical Performance Characteristics

Static Supply Current vs. Temperature

20031796

Temperature Error

20031797

1.0 Functional Description

The LM71 temperature sensor incorporates a temperature

sensor and 13-bit plus sign ΔΣ ADC (Delta-Sigma Analog-to-

Digital Converter). Compatibility of the LM71's three wire

serial interface with SPI and MICROWIRE allows simple com-

munications with common microcontrollers and processors.

Shutdown mode can be used to optimize current drain for dif-

ferent applications. A Manufacture's/Device ID register iden-

tifies the LM71 as National Semiconductor product.

1.1 POWER UP AND POWER DOWN

The LM71 always powers up in a known state. The power up

default condition is continuous conversion mode. Immediately

after power up the LM71 will output an erroneous code until

the first temperature conversion has completed.

When the supply voltage is less than about 1.6V (typical), the

LM71 is considered powered down. As the supply voltage

rises above the nominal 1.6V power up threshold, the internal

registers are reset to the power up default state described

above.

1.2 SERIAL BUS INTERFACE

The LM71 operates as a slave and is compatible with SPI or

MICROWIRE bus specifications. Data is clocked out on the

falling edge of the serial clock (SC), while data is clocked in

on the rising edge of SC. A complete transmit/receive com-

munication will consist of 32 serial clocks. The first 16 clocks

comprise the transmit phase of communication, while the

second 16 clocks are the receive phase.

When CS is high SI/O will be in TRI-STATE. Communication

should be initiated by taking chip select (CS) low. This should

not be done when SC is changing from a low to high state.

Once CS is low the serial I/O pin (SI/O) will transmit the first

bit of data. The master can then read this bit with the rising

edge of SC. The remainder of the data will be clocked out by

the falling edge of SC. CS can be taken high at any time during

the transmit phase. If CS is brought low in the middle of a

conversion the LM71 will complete the conversion and the

output shift register will be updated after CS is brought back

high.

The receive phase of a communication starts after 16 SC pe-

riods. CS can remain low for 32 SC cycles. The LM71 will read

the data available on the SI/O line on the rising edge of the

serial clock. Input data is to an 8-bit shift register. The part will

detect the last eight bits shifted into the register. The receive

phase can last up to 16 SC periods. All ones must be shifted

in order to place the part into shutdown. All zeros must be

shifted in order to place the LM71 into continuous conversion

mode. Only the following codes should be transmitted to the

LM71:

•00 hex for continuous conversion

•FF hex for shutdown

Another code may place the part into a test mode. Test modes

are used by National Semiconductor to thoroughly test the

function of the LM71 during production testing. Only eight bits

have been defined above since only the last eight transmitted

are detected by the LM71, before CS is taken HIGH.

The following communication can be used to determine the

Manufacturer's/Device ID and then immediately place the part

into continuous conversion mode. With CS continuously low:

•Read 16 bits of temperature data

•Write 16 bits of data commanding shutdown

•Read 16 bits of Manufacture's/Device ID data

•Write 8 to 16 bits of data commanding Conversion Mode

•Take CS HIGH.

Note that 300 ms will have to pass for a conversion to com-

plete before the LM71 actually transmits temperature data.

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LM71/LM71Q

1.3 TEMPERATURE DATA FORMAT

Temperature data is represented by a 14-bit, two's comple-

ment word with an LSB (Least Significant Bit) equal to

0.03125°C:

Temperature Digital Output

Binary Hex

+150°C 0100 1011 0000 0011 4B03

+125°C 0011 1110 1000 0011 3E83

+25°C 0000 1100 1000 0011 0C83

+0.03125°C 0000 0000 0000 0111 0007

0°C 0000 0000 0000 0011 0003

−0.03125°C 1111 1111 1111 1111 FFFF

−25°C 1111 0011 1000 0011 F383

−40°C 1110 1100 0000 0011 EC03

The first data byte is the most significant byte with most sig-

nificant bit first, permitting only as much data as necessary to

be read to determine temperature condition. For instance, if

the first four bits of the temperature data indicate an overtem-

perature condition, the host processor could immediately take

action to remedy the excessive temperatures.

1.4 SHUTDOWN MODE/MANUFACTURER'S ID

Shutdown mode is enabled by writing XX FF to the LM71 as

shown in Figure 7c. The serial bus is still active when the

LM71 is in shutdown. When in shutdown mode the LM71 al-

ways will output 1000 0000 0000 1111. This is the

manufacturer's/Device ID information. The first 5-bits of the

field (1000 0XXX) are reserved for manufacturer's ID.

1.5 INTERNAL REGISTER STRUCTURE

The LM71 has three registers, the temperature register, the

configuration register and the manufacturer's/device identifi-

cation register. The temperature and manufacturer's/device

identification registers are read only. The configuration regis-

ter is write only.

1.5.1 Configuration Register

(Selects shutdown or continuous conversion modes):

(Write Only):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

X X X X X X X X Shutdown

D0–D15 set to XX FF hex enables shutdown mode.

D0–D15 set to 00 00 hex sets Continuous conversion mode.

Note: setting D0-D15 to any other values may place the LM70 into a manufacturer's test mode, upon which the LM71 will stop

responding as described. These test modes are to be used for National Semiconductor production testing only. See Section 1.2

Serial Bus Interface for a complete discussion.

1.5.2 Temperature Register

(Read Only):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSB Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit1 LSB 1 1

D0–D1: Logic 1 will be output on SI/0.

D2–D15: Temperature Data. One LSB = 0.03125°C. Two's complement format.

1.5.3 Manufacturer/Device ID Register

(Read Only):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

1000000000001111

D0–D1: Logic 1 will be output on SI/0.

D2–D15: Manufacturer's/Device ID Data. This register is accessed whenever the LM71 is in shutdown mode.

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LM71/LM71Q

2.0 Serial Bus Timing Diagrams

20031714

a) Reading Continuous Conversion - Single Eight-Bit Frame

20031715

b) Reading Continuous Conversion - Two Eight-Bit Frames

20031718

c) Writing Shutdown Control

FIGURE 7. Timing Diagrams

3.0 Application Hints

To get the expected results when measuring temperature with

an integrated circuit temperature sensor like the LM71, it is

important to understand that the sensor measures its own die

temperature. For the LM71, the best thermal path between

the die and the outside world is through the LM71's pins. In

the SOT23 package, all the pins on the LM71 will have an

equal effect on the die temperature. Because the pins repre-

sent a good thermal path to the LM71 die, the LM71 will

provide an accurate measurement of the temperature of the

printed circuit board on which it is mounted. There is a less

efficient thermal path between the plastic package and the

LM71 die. If the ambient air temperature is significantly dif-

ferent from the printed circuit board temperature, it will have

a small effect on the measured temperature.

In probe-type applications, the LM71 can be mounted inside

a sealed-end metal tube, and can then be dipped into a bath

or screwed into a threaded hole in a tank. As with any IC, the

LM71 and accompanying wiring and circuits must be kept in-

sulated and dry, to avoid leakage and corrosion. This is

especially true if the circuit may operate at cold temperatures

where condensation can occur. Printed-circuit coatings and

varnishes such as Humiseal and epoxy paints or dips are of-

ten used to insure that moisture cannot corrode the LM71 or

its connections.

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LM71/LM71Q

4.0 Typical Applications

20031720

FIGURE 8. Temperature monitor using Intel 196 processor

20031719

FIGURE 9. LM71 digital input control using micro-controller's general purpose I/O.

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LM71/LM71Q

Physical Dimensions inches (millimeters) unless otherwise noted

Order Number LM71 Top View

CIMF/QCIMF

NS Package Number MF05A

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LM71/LM71Q

Order Number LM71 Bottom View

CISD

NS Package Number SDE06A

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LM71/LM71Q

Notes

LM71/LM71Q SPI/MICROWIRE™ 13-Bit Plus Sign Temperature Sensor

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