Your specialist in innovating humidity & temperature sensors
Digital relative humidity & temperature sensor RHT02
1. Feature & Application:
*High precision *Capacitive type *Full range temperature compensated *Relative humidity and temperature measurement *Calibrated digital signal
*Outstanding long-term stability *Extra components not needed *Long transmission distance, up to 100 meters *Low power consumption
2. Description:
RHT02 output calibrated digital signal. It applys exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. Its sensing elements is connected with 8-bit single-chip computer. Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite coefficient from memory. Small size & low consumption & long transmission distance(100m) enable RHT02 to be suited in all kinds of harsh application occasions.
3. Technical Specification:
Model Power supply Output signal Sensing element Operating range Accuracy
Resolution or sensitivity
RHT02 3.3-5.5V DC
digital signal via MaxDetect 1-wire bus
Polymer humidity capacitor
humidity 0-100%RH;
temperature -40~80Celsius
humidity +-3%RH(Max +-5%RH); temperature +-0.5Celsius
humidity 0.1%RH;
temperature 0.1Celsius
-1-
MaxDetect Technology Co., Ltd. -----------------------------------------
Thomas Liu (Sales Manager) Email:
[email protected] ,
[email protected]
http://www.humiditycn.com
Repeatability Humidity hysteresis Long-term Stability Interchangeability
Your specialist in innovating humidity & temperature sensors
humidity +-1%RH;
temperature +-0.3Celsius
+-0.5%RH
+-0.5%RH/year
fully interchangeable
4. Dimensions of RHT02's PCB board(unit----mm) and wiring diagram:
Pin Function 1 VDD----power supply , red wire 2 DATA--signal, yellow wire 3 GND, black wire 4 Null
5. Electrical connection diagram:
6. Operating specifications:
(1) Power and Pins Power's voltage should be 3.3-5.5V DC. When power is supplied to sensor, don't send any instruction to the sensor within one second to pass unstable status. One capacitor valued 100nF can be added between VDD and GND for wave filtering.
-2-
MaxDetect Technology Co., Ltd. -----------------------------------------
Thomas Liu (Sales Manager) Email:
[email protected] ,
[email protected]
http://www.humiditycn.com
Your specialist in innovating humidity & temperature sensors
(2) Communication and signal MaxDetect 1-wire bus is used for communication between MCU and RHT02. ( MaxDetect 1-wire bus is specially designed by MaxDetect Technology Co., Ltd. , it's different from Maxim/Dallas 1-wire bus, so it's incompatible with Dallas 1-wire bus.)
Illustration of MaxDetect 1-wire bus:
DATA=16 bits RH data+16 bits Temperature data+8 bits check-sum
Example: MCU has received 40 bits data from RHT02.