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E-mail
319059197@qq.com
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Phone
15013668479
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Address
East 3rd Floor, Building 15, Majialong Industrial Zone, Nantou Street, Nanshan District, Shenzhen
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Shenzhen Yuanjian Sensing Technology Co., Ltd
Temperature and humidity module MHTCI
NegotiableUpdate on 06/24
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Overview
Product Manual Product Specification Product Name: Digital Temperature and Humidity Module Product Model: MHTCI Version: V1
Product Details
Product manual
product specification
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Product Name:
Digital temperature and humidity module
Product model:
MHTCI
edition:
V1.0
Developed by:
He Genwen
Reviewer:
Yuan Chao
1、 Product Description:
This product is a temperature and humidity integrated sensor with calibrated digital signal output. It uses imported sensing components and digital signal output, and has the characteristics of long-term stability, high reliability, high accuracy, and low power consumption. It is not affected by power noise and voltage fluctuations, and is widely used in HVAC automatic control, temperature controllers/thermostats, computer room monitoring, white goods, indoor weather stations, automotive climate control, medical and other fields;
2、 Performance indicators:
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Supply Voltage
DC 5V
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measurement accuracy
Temperature: ± 0.4 ℃ Humidity: ± 3% RH
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measuring range
Humidity 0% -100% RH Temperature -40 ℃ -85 ℃
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power consumption
Work:<1mA Standby: 150uA (3V)
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data interface
Standard I2C
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resolution
Temperature 0.1 ℃ Humidity: 0.1% RH
3、 Definition of I2C interface
3.1 Sensor Pin Allocation Table 1: Pin Allocation
Pin
name
describe
1
GND
grounds
2
VCC
Power supply DC5V
3
SCL
clock signal
4
SDA
Serial data, bidirectional port
3.2 Power Pin (VCC GND)
The power supply voltage of this product is DC5V
3.3 Serial Clock (SCL)
Figure 1: Pin allocation
SCL is used for communication synchronization between microprocessors and sensors.
3.4 Serial Data (SDA)
The SDA pin is a three state structure used for reading and writing sensor data. When sending commands to the sensor, SDA must remain stable when the rising edge of SCL is active and when SCL is high. SDA changes after the falling edge of SCL. When reading data from sensors, SDA becomes effective after SCL decreases and remains valid until the falling edge of the next SCL
Figure 2 Host Write Command
Sensor output dataTable 2 I/O Signal Characteristics Table
4、 Sensor Communication Instructions 4.1 I2C Signal Instructions
1) 7-bit addressing address
Start timing S
Stop timing P
I2C bus interface timing diagram
Each transmission sequence starts with the Start state. When SCL is at high level, SDA switches from high level to low level
level
Each transmission sequence ends with a Stop state. When SCL is at a high level, SDA transitions from a low level to a high level
flat
4.2 Timing Explanation
The parameters used are as follows
I2C command address byte
I2C Command Table
Ask the register to describe the following program
Humidity calculation
temperature calculation
5、 Basic Connection Diagram
Due to the addition of a 10K pull-up resistor inside the sensor, it can be directly connected and used when the communication distance is not very far. If the communication distance is too far, an external pull-up resistor must be added to ensure normal and reliable communication.
6、 Specification and size
7、 Application Information
7.1 Working and Storage Conditions
The relative humidity of the environment is greatly affected by temperature. When installing, the sensor should be kept away from electronic components with high working temperature rise as much as possible, while maintaining good ventilation.
7.2 Exposure to Chemical Substances
This product is similar to a capacitive humidity sensor and is sensitive to chemical vapors. The diffusion of chemical substances in the sensing layer can lead to inaccurate measurement data and decreased reaction sensitivity.
