Temperature and Humidity Sensor Module (Model: ZS21) Manual Version: V1.0 Date: 2022.03.18 Zhengzhou Winsen Electronics Technology Co., Ltd

Statement This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without the written permission, any part of this manual shall not be copied, translated, stored in database or retrieval system, also can’t spread through electronic, copying, record ways. Thanks for purchasing our product. In order to let customers use it better and reduce the faults caused by misuse, please read the manual carefully and operate it correctly in accordance with the instructions. If users disobey the terms or remove, disassemble, change the components inside of the sensor, we shall not...

Zhengzhou Winsen Electronics Technology Co., Ltd ZS21 Temperature and Humidity Sensor Module Overview ZS21 is a brand new product equipped with a dedicated ASIC sensor chip, a high-performance semiconductor silicon-based capacitive humidity sensor and a standard on-chip temperature sensor, and is connected with a high-performance 8-bit microcontroller to output standard I2C data signals. At the same time, each sensor is calibrated in a high-precision temperature and humidity verification box, so the product has good consistency; ZS21 products use special humidity-sensitive materials, so that...

Zhengzhou Winsen Electronics Technology Co., Ltd Fig 1 Maximum error of relative humidity at 25°C Technical parameters of temperature Parameter Accuracy error Prolonged Drift Fig 2 Temperature typical error and maximum error Email: [email protected] Leading gas sensing solutions supplier i

Zhengzhou Winsen Electronics Technology Co., Ltd Electrical characteristics Parameter Power Supply Low level input voltage High level input voltage Sampling period Communication Format Table 3 1. This accuracy is the testing accuracy of the sensor under the condition of 25 ℃ power &supply voltage of 3.3V during delivery inspection. This value excludes hysteresis and nonlinearity and applies only to non condensing conditions. 2 the time required to reach 63% of the first-order response at 25 ℃ and 1m/s air flow. 3. Normal working range: 0-80% RH. Beyond this range, the sensor reading will deviate...

Zhengzhou Winsen Electronics Technology Co., Ltd Fig 3 Working scope 1.2 RH accuracy at different temperatures Figure 4 shows the maximum humidity error for other temperature ranges. Figure 4 The maximum error of the corresponding humidity in the range of 0-80℃ 2.1 Welding instructions Reflow soldering or wave soldering is prohibited for products. For manual welding, the contact time must be less than 5 seconds under the temperature of up to 300 ℃. Note: after welding, the sensor shall be stored in the environment of > 75% RH for at least 12 hours to ensure the rehydration of the polymer. Otherwise,...

Zhengzhou Winsen Electronics Technology Co., Ltd Temperature and humidity sensors are not ordinary electronic components and need careful protection, which users must pay attention to. Long term exposure to high concentration of chemical vapor will cause the reading of the sensor to drift. Therefore, it is recommended to store the sensor in the original package, including the sealed ESD pocket, and meet the following conditions: the temperature range is 10 ℃ - 50 ℃ (0-85 ℃ in a limited time); Humidity is 20-60% RH (sensor without ESD package). For those sensors that have been removed from their...

Zhengzhou Winsen Electronics Technology Co., Ltd PIN V Serial data, bidirectional Power -Ground Serial data, bidirectional 3.2 Serial data See the specific description of the communication protocol 4.Sensor communication ZS21 sensor adopts standard I2C communication protocol, which is suitable for a variety of devices. The protocol uses two data lines: serial data bus (SDA) and serial clock bus (SCL). The resistance is generally 4~10 kΩ. Multiple sensor devices can share the bus; however only one host device can be present on the bus, the sensor I2C address is 0x88. 4.1 I2C Communication Interface...

Zhengzhou Winsen Electronics Technology Co., Ltd start signal time SCL Clock high width Set time relative to SCL edge start condition Data retention time relative to SCL SDA edge Data Setup Time Relative to SCL SDA Edge Set time in SCL stop condition BUS Idle Time Between Stop and Start Condition 4.2 I2C output When the host initiates a start signal, and the operation mode of the SCL bus satisfies the above time parameter conditions, the sensor will start communication. Commands or data are always sent when SCL is on the rising edge, until the sensor receives the stop signal sent by the host...

Zhengzhou Winsen Electronics Technology Co., Ltd Temperature High Bit + Temperature Low Bit + Temperature CRC Check + Humidity High Bit + Humidity Low Bit + Humidity CRC Check  Communication data (information frame) format Check code calculation routine: Email: [email protected]

Zhengzhou Winsen Electronics Technology Co., Ltd Important notice Warning, Personal Injury Do not apply this product to safety protection devices or emergency stop equipment, and any other applications that may cause personal injury due to the product's failure. Do not use this product unless there is a special purpose or use authorization. Refer to the product data sheet and application guide before installing, handling, using or maintaining the product. Failure to follow this recommendation may result in death and serious personal injury. If the buyer intends to purchase or use Winsen’s products...