ChipCap
g
Features
• Simultaneous relative humidity and temperature
outputs
• Precision accuracy ±2% RH, ±0.6°C
• Resolution 0.4% RH
• Factory selectable analog or digital outputs
• Output confi gurations available:
Voltage 0V to 1V
10 to 90% of VDD
ZACwireTM digital output (8-bit humidity)
• Factory calibrated, ready to use
• Designed for automated assembly
• Supply voltage: 3.0V to 5.5V
• Low quiescent current: 0.5mA@5V, 25°C
• SOP 14 package
Applications
• HVAC Controls
³ Humidistats
³ Enthalpy control
³ Indoor air quality (IAQ)
³ Humidifi ers
³ Dehumidifi ers
• Instrumentation
³ Portable instruments
³ Data loggers and recorders
³ Weather stations
• Medical
³ Nebulizers
³ Oxygen air
³ CPAP/Sleep apnea devices
• Automotive
³ Cabin climate control
³ Defrost control
• Appliances and white goods
• OEM assemblies available
The Fully Calibrated Humidity
and Temperature Solution
GE
Sensing & Inspection Technologies
ChipCap³The Fully Calibrated
Humidity and Temperature Sensor
The ChipCap series humidity sensor by GE oȺ ers a
new standard in the fi eld of accurate relative humidity
measurement. Based on a capacitive polymer sensing
technology, this device oȺ ers signal conditioning and
temperature compensation for a single SoC (Systemon-
Chip) solution. The device is very simple to use, fully
tested and calibrated for accuracy on delivery³no
further calibration is needed. ChipCap can be
incorporated into an assembly or fi nished sensor to meet
customer specifi cations. The measurement is accurate
to ±2% from 20% to 80% RH and ±3% across the entire
humidity range. Long term stability is excellent. The
temperature accuracy is ±1°C from 0°C to +70°C. Dual
outputs provide humidity and temperature as 0V to 1V,
or 0.5V to 4.5V ratiometric or available with digital output
(the ZACwire one-wire interface).
Accurate, Repeatable Humidity and
Temperature Measurement
ChipCap provides either analog or digital interfaces
on a single, 5VDC-powered chip. The package is highly
resistant to chemical vapors and other contaminants.
ChipCap sensors are precalibrated and oȺ er high
interchangeability. They also fully recover from
condensing environments and may be used across a
wide range of both temperature and relative humidity
ranges.
ChipCap relative humidity sensors change capacitance
in direct proportion to ambient relative humidity. An
internal solid-state band gap provides temperature
measurement. This integral design reduces overall cost
and complexity and improves reliability.
Small, Integrated Package for
Automated Assembly
ChipCap contains the entire signal conditioning circuitry
on a single silicon die. The sensor and circuitry are
integrated into a small footprint SoC to save board
real estate. ChipCap is shipped in tube packaging for
automated insertion on surface mount technology (SMT)
circuit boards. Tape and reel packaging is available upon
request for high volume applications.
9.5 ±0.07 mm 6.00 ±0.02 mm
3.22 ±0.10 mm
OUT-RH
NC
NC
V+
NC
NC
NC
NC
NC
NC
GND
NC
NC
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
3V to 5.5V
Gnd
0.1μ
supply
μC
ChipCap
RH
Sensor
Digital Interface
OUT-RH
NC
NC
V+
NC
NC
NC
NC
NC
NC
GND
NC
NC
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
RH Output
Temp Output
V
3V to 5.5V
Gnd
0.1μ
supply
ChipCap
RH
Sensor
Analog Interface
Linear mode:
%RH = Vout * 100
Tc = Vout * 200 -50
Ratiometric mode:
%RH = ((Vout - (0.1 * Vsupply))/(0.8 * Vsupply)) * 100
Tc = ((Vout - (0.1 * Vsupply))/(0.8 * Vsupply)) * 200 - 50
ChipCap Specifi cations
Relative Humidity
RH Sensor
Planar Capacitive Polymer
RH Range
0 to 100% RH
RH Accuracy @ 25°C
±2% from 20% to 80%
±3% from 0% to 20% and 80% to 100%
RH Resolution
0.4% RH
Temperature
Temperature Sensor
Integral band gap PTAT
Temperature Scale
-50°C to 150°C
Temperature Accuracy
±0.6°C at 25°C (see graph below)
Temperature Resolution
0.2°C
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
-40-200 25507085
Temperature
Error (C)
Maximum Error
Maximum Error
T
yp
ical Error
Power Supply
Reverse Polarity Protection
12.5 VDC, 100ƄA (15VDC, 60s)
Voltage Supply
3 to 5.5 VDC
Current Supply
500 microamps @ 5 VDC, 25°C
Outputs
RH Voltage Output (Ratiometric)
Vout = (Vsupply/5)(0.5+(.04*RH)); 0.5 to 4.5V ratiometric;
5VDC nom.
RH Voltage Output (Linear, 0-1V)
Vout = 0.01(RH)
RH Digital Output
Manchester 8-bit encoded
Temperature Voltage Output (Ratiometric)
Vout = (Vsupply/5)(1.5 + (.02*T°C)); 0.5 to 4.5V
ratiometric; 5VDC nom.
Temperature Voltage Output (Linear)
Vout = (0.005T °C) +0.25
Temperature Digital Output
Manchester 10-bit encoded
© 2008 General Electric Company. All Rights Reserved. Specifi cations are subject to change without notice. GE is a registered trademark of General Electric Company. Other company or product
names mentioned in this document may be trademarks or registered trademarks of their respective companies, which are not aȻ liated with GE.
gwww.gesensinginspection.com
Environmental
Operating Temperature Range
-40°C to 85°C
Operating RH Range
0 to 100 % RH, non-condensing
Packaging
Packaging
SOP-14, SMD
Soldering
IR Solder Refl ow, 260°C, 10 sec
Pin Connection
4 Pin; +V, Gnd, RHout, Tout
920-426B
Absolute Maximum Ratings
Symbol Parameter Min. Max. Units Notes
Vdd DC Supply Voltage -0.3 6 V
Vio Voltage at all Analog and
Digital I/O pins
-0.3 Vdd + 0.3 V
Ta Ambient Temperature
(operation)
-50
-40
150
85
°C
°C
ASIC
RH Sensor
Tstrg Storage Temperature -55 150 °C
Tj Junction Temperature -55 160 °C
Recommended Operation Conditions
Symbol Parameter Min. Type Max. Units Notes
Vdd Analog DC Supply 3 5 5.5 V
Idd Supply Current 550 ƄA 25°C
Vss Analog Ground 0.0 V
To Ambient Temperature -40 27 85 °C
Cvdd External Capacitance
between Vdd and Vss
100 220 470 nF
CLD Digital Output Load (only
capacitive, no resistive)
100 pF
CLA Analog Output Load
Capaictance
5nF
RLA Analog Output Load
Resistance
5K
Model Part Description
ChipCap-L ChipCap RH and Temperature Sensor, 0-1VDC Linear Output
ChipCap-R ChipCap RH and Temperature Sensor, 0.5- 4.5VDC
Ratiometric Output (5VDC Nominal)
ChipCap-D ChipCap RH and Temperature Sensor,
Digital Output
- -
Ordering Information
