GE
Sensing & Inspection Technologies
ChipCap
The Fully Calibrated Humidity
and Temperature Solution
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 configurations available:
Voltage 0V to 1V
10 to 90% of VDD
ZACwire
TM
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
• Instrumentation
Portable instruments
Data loggers and recorders
Weather stations
• Medical
Nebulizers
Oxygen air
CPAP/Sleep apnea devices
• Automotive
Cabin climate control
Defrost control
• Appliances and white goods
• OEM assemblies available
Applications
• HVAC Controls
Humidistats
Enthalpy control
Indoor air quality (IAQ)
Humidifiers
Dehumidifiers
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ChipCap The Fully Calibrated
Humidity and Temperature Sensor
The ChipCap series humidity sensor by GE o ers a
new standard in the field of accurate relative humidity
measurement. Based on a capacitive polymer sensing
technology, this device o 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 delivery no
further calibration is needed. ChipCap can be
incorporated into an assembly or finished sensor to meet
customer specifications. 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).
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.
Digital Interface
V supply
3V to 5.5V
8
9
10
NC
NC
NC
V+
NC
NC
OUT-RH
NC
NC
NC
GND
7
6
5
4
3
2
1
0.1μ
RH
Sensor
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 o 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.
μC
11
12
13
14
ChipCap
NC
NC
NC
Gnd
Analog Interface
V supply
3V to 5.5V
8
9
10
11
12
13
RH Output
14
NC
NC
NC
V+
NC
NC
OUT-RH
NC
NC
NC
GND
NC
NC
NC
7
6
5
4
3
2
1
Gnd
0.1μ
RH
Sensor
ChipCap
9.5 ±0.07 mm
6.00 ±0.02 mm
Temp Output
3.22 ±0.10 mm
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 Specifications
Relative Humidity
RH Sensor
Planar Capacitive Polymer
Power Supply
Reverse Polarity Protection
12.5 VDC, 100 A (15VDC, 60s)
Voltage Supply
3 to 5.5 VDC
RH Range
0 to 100% RH
Current Supply
500 microamps @ 5 VDC, 25°C
RH Accuracy @ 25°C
±2% from 20% to 80%
±3% from 0% to 20% and 80% to 100%
Outputs
RH Voltage Output (Ratiometric)
Vout = (Vsupply/5)(0.5+(.04*RH)); 0.5 to 4.5V ratiometric;
5VDC nom.
RH Resolution
0.4% RH
Temperature
Temperature Sensor
Integral band gap PTAT
RH Voltage Output (Linear, 0-1V)
Vout = 0.01(RH)
RH Digital Output
Manchester 8-bit encoded
Temperature Scale
-50°C to 150°C
Temperature Voltage Output (Ratiometric)
Vout = (Vsupply/5)(1.5 + (.02*T°C)); 0.5 to 4.5V
ratiometric; 5VDC nom.
Temperature Accuracy
±0.6°C at 25°C (see graph below)
Temperature Voltage Output (Linear)
Vout = (0.005T °C) +0.25
Temperature Resolution
0.2°C
Temperature Digital Output
Manchester 10-bit encoded
4.0
3.0
Maximum Error
2.0
1.0
Error (C)
Typical Error
0.0
-40
-1.0
Maximum Error
-20
0
25
50
70
85
-2.0
-3.0
-4.0
Temperature
Environmental
Operating Temperature Range
-40°C to 85°C
Ordering Information
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
Operating RH Range
0 to 100 % RH, non-condensing
Packaging
Packaging
SOP-14, SMD
-
-
Soldering
IR Solder Reflow, 260°C, 10 sec
Pin Connection
4 Pin; +V, Gnd, RHout, Tout
Absolute Maximum Ratings
Symbol
Vdd
Vio
Ta
Tstrg
Tj
Parameter
DC Supply Voltage
Voltage at all Analog and
Digital I/O pins
Ambient Temperature
(operation)
Storage Temperature
Junction Temperature
Min.
-0.3
-0.3
-50
-40
-55
-55
Max.
6
Vdd + 0.3
150
85
150
160
Units
V
V
°C
°C
°C
°C
ASIC
RH Sensor
Notes
Recommended Operation Conditions
Symbol
Vdd
Idd
Vss
To
Cvdd
C
LD
C
LA
R
LA
Parameter
Analog DC Supply
Supply Current
Analog Ground
Ambient Temperature
External Capacitance
between Vdd and Vss
Digital Output Load (only
capacitive, no resistive)
Analog Output Load
Capaictance
Analog Output Load
Resistance
5
-40
100
Min.
3
Type
5
550
0.0
27
220
85
470
100
5
Max.
5.5
Units
V
A
V
°C
nF
pF
nF
K
25°C
Notes
g
www.gesensinginspection.com
920-426B
© 2008 General Electric Company. All Rights Reserved. Specifications 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 a liated with GE.
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