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China DUUHNN Temperature and Humidity Sensor Module

The Temperature and Humidity Sensor is calibrated, calibrated and tested.It has the characteristics of long-term stability, high reliability, high precision and low power consumption.

  • Brand:

    DUUHNN
  • Item NO.:

    DH01C

Product Summary

Temperature-Humidity Sensor Module


This DUUHNN Temperature-Humidity Sensor Module is a high stability capacitive humidity sensor as a sensing element, through the microprocessor acquisition and processing into digital signal output.Each sensor is calibrated, calibrated and tested.It has the characteristics of long-term stability, high reliability, high precision and low power consumption.


Dimensions

Unit:mm(±0.5)

image.png


Product features

  • Digital output, IIC protocol.

  • Ultra-low power consumption.

  • 0-100% relative humidity measurement range.

  • Full calibration, temperature drift calibration.

  • Using Independent humidity sensor , good stability, strong anti-pollution ability


Product performance

Relative Humidity 


Table 1

Parameter

Condition

min

typ

max

Unit

Resolution



0.1


%RH

Operating Range


0


99.9

%RH

Accuracy

25


±3


%RH

Repeatability



±0.1


%RH

Response time

t 63%


8


S

Hysteresis



±0.5


%RH

Long term drift



<3


%RH/yr


Figure1

image.png

Temperature

Table 2

Parameter

Condition

min

typ

max

Unit

Resolution



0.1


Operating Range


-40


80

Accuracy

25


±0.5


Repeatability



±0.2


Response time

t 63%

1



S

Hysteresis



±0.1


Long term drift



<0.2


/yr


Figure2

image.png


Electrical Specification


Table 3

Parameter

Condition

Min

Typ

Max

Unit

Supply Voltage, VDD


2.8

3.3

5.5

V

Supply Current, IDD

sleep mode


0.2


μA

measuring


500


μA

Sampling period



2.0


S

Low level output voltage

Io<4mA

0


250

mV

High level output voltage

Rp<25kΩ

80%


100%

VDD

Low level input voltage

Falling edge

0%


20%

VDD

High level input voltage

Rising edg

80%


100%

VDD

output current

on



4

mA

Tri-state gateoff


10

20

μA

lo :low level output current     Rp: Pull-up resistors


User Guide

image.png

1.1power pin(VDD GND)

The power supply voltage of this product is 2.8 ~ 5.5V, and the recommended power supply voltage is 3.3V.

1.2 Serial data(SDA)

   SDA is a data port with a three-state structure. SDA changes its state after the falling edge of the SCK clock and is only effective at the rising edge of the SCK.

1.3 Serial clock(SCK)

   SCK is used for communication synchronization between microprocessor and HTMC01.Pay attention to the frequency range.


2. Communication protocol

HTMC01 In order to accurately measure the humidity of the gas and reduce the influence of temperature on the measurement, the HTMC01 sensor will automatically switch to sleep mode when it is not working, so as to reduce the influence of its own heat on the humidity of the surrounding gas.HTMC01 adopts passive operation mode, that is, after the host awakenes the sensor through instructions, the sensor starts measuring, responding and other actions.After the communication, the sensor goes into hibernation.

2.1 HTMC01 Circuit diagram


3.jpg

Figure 3 IIC communication connection diagram


2.2  Input/output characteristics

Electrical characteristics, such as power consumption, high and low level voltages of input and output, depend on the power supply voltage.Table 3 explains the electrical characteristics of HTMC01 in detail.For optimal communication with the sensor, strictly follow the conditions in Table 4 and Figure 5 when designing.

4.jpg


Figure 4

 


Parameter

min

typ

max

Units

FSCK

SCK frequency



100

KHZ

TSCKx

SCK High/low time

5



µs

TR/TF

SCK Rise/fall time



1

µs

TFO

SDA fall time



800

µs

TRO

SDA rise time



1000

µs

TV

SDA Valid Time


400


µs

TSU

SDA Set-Up Time


350


µs

THD

SDA Hold Time


100


µs

Table 5

2.3 IIC communication protocol

HTMC01 uses standard I2C protocol to communicate.Therefore, more details about I2C will not be described in this manual.Please refer to the I2C Agreement for more information than is provided in the following sections.

2.4 Starting sensor

choose the right power supply, the power on rate should not be less than 1V/ms.

2.5 Start/stop timing


Each transport series starts with a START state and ends with a STOP state

 7.jpg

Figure 5 Start Transmission State (S) - SDA switches from high to low when SCK is high.The start state is a special bus state controlled by the host, indicating the start of machine transmission.

Figure 6 Stop Transmission Status (P) - SDA switches from low to high when SCK is high.The stop state is a special bus state controlled by the host, indicating the end of the slave transmission.


2.6 Send the command

After the transmission is started, the first byte of I2C that is subsequently transmitted consists of a 7-bit I2C device address (currently only supported 44H) and an SDA direction bit (read R: '1', write W: '0').After the eighth SCL clock falling edge, the sensor data communication is normal by pulling down the SDA signal line (ACK bit).

Sensor address

44H

Trigger temperature and humidity measurements

2C10H

Trigger temperature measurement

CC44H

Trigger humidity measurement

CC66H

Table 6 Sensor communication parameters

 

2.7 Read temperature and humidity

Time sequence diagram of HTMC01 reading temperature and humidity is as follows: white is controlled by microcontroller, sensor response is gray block

Read steps are as follows:

a. Reset sensor, initialize


instruction

Hexadecimal code

Soft reset

0x30A2

Initialize 1

0xCCB8

Initialize 2

0xCCBA

5.jpg 


b. Obtain humidity operation coefficient and system configuration ( can not read)

instruction

Hexadecimal code

Read HumA 8 bits high

0xD208

Read HumA 8 bits low

0xD209

Read HumB8 bits high

0xD210

Read HumB8 bits low

0xD211

Read configuration word Cfg (not read)

0xD206

6.jpg 

c. Trigger the measurement of temperature and humidity

  Separate temperature and humidity measurement modes

  A humidity or temperature data collection is triggered by sending the measurement command CC44H or CC66H.During transmission, each data value is always by CRC checks and.The 16-bit commands are shown in the following table.Repeatability (low, medium and high default is high) and clock extension (enabling or disabling default is disabled) can be achieved by modifying the configuration registers.Repeatability affects the duration of the measurement, which in turn affects the total power consumption of the sensor.

 

instruction

Hexadecimal code

Measuring temperature

0xCC44

Measuring humidity

0xCC66

8.jpg 

Simultaneous measurement mode

instruction

Hexadecimal code

Measure temperature and humidity

0x2C10

9.jpg 

Temperature and relative humidity conversion

Through the above two ways, 16bit temperature raw data ST and 16bit humidity raw data SH can be obtained, then we plug it into the following formula

Temperature (℃) : 11.jpg

Humidity (%RH) :      12.jpg

Note: Rh is limited to 0~100, if(RH>100) RH=100;

Else if (RH<0) RH=0;

 

d. Modify the configuration register

Cfg

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x02

Reserved

Reserved

clk_strench

Mps2

Mps1

Mps0

Repeatbil

ity1

Repeatbil

ity1

describe

keep

IC interface clock stretch enabler:

0: No stretching allowed

1:Allow tretching

 

Selection of measurement times per second:

000: single

 

Repeatability Settings:

00: Low repeatability

01:Moderate reproducibility

10: High repeatability

 

 

instruction

Hexadecimal code

Modify the configuration word Cfg

0x5206

13.jpg 

 

e. Cyclic redundancy check (CRC) calculation

The 8-bit CRC checksum sent after each data word is generated by the CRC algorithm.Its properties are shown in the following table

 

attribute

numerical

name

CRC-8

bit wide 

8 bit

Protect the data

Read/write

polynomial

0x31X8+X5+X4+1

initial data

0xFF

Whether each byte of the data under test is bitwise reversed

no


Application information

1.working conditions

To ensure the normal and stable performance of the sensor, it is recommended to use the temperature range of -40℃-80℃ and the humidity range of 0-99.9%RH.Extra-recommended ranges may cause a temporary drift in the measurement results.

2. Storage conditions and recovery

To ensure the normal and stable performance of the sensor, it is recommended to use the temperature range of -40℃-80℃ and the humidity range of 0-99.9%RH.Extra-recommended ranges may cause a temporary drift in the measurement results.

3. temperature influence

Relative humidity is largely dependent on temperature.The product has made the temperature calibration compensation before leaving the factory. When measuring humidity, the sensor should be guaranteed to work at the same temperature as far as possible. When it is installed on the product, it should be as far away from the heat source as possible.Otherwise it will not be able to accurately test the relative humidity of the gas.

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