Winsen ZS13 Temperature and Humidity Sensor Module User Manual

Winsen ZS13 Temperature and Humidity Sensor Module

Product Information

Specifications

• Model: ZS13
• Version: V1.0
• Date: 2023.08.30
• Manufacturer: Zhengzhou Winsen Electronics Technology Co., Ltd
• Website: www.winsen-sensor.com
• Power Supply Voltage Range: 2.2V to 5.5V

Overview
The ZS13 Temperature and Humidity Sensor Module is a versatile device suitable for various applications in different fields including home appliances, industrial settings, data logging, weather stations, medical devices, and more.

Features

• Fully calibrated
• Wide power supply voltage range, from 2.2V to 5.5V

Applications
The sensor module can be used in:

• Home appliance fields: HVAC, dehumidifiers, smart thermostats, room monitors, etc.
• Industrial fields: Automobiles, testing equipment, automatic control devices
• Other fields: Data loggers, weather stations, medical devices, and related temperature and humidity detection devices

Technical Parameters of Relative Humidity

Product Usage Instructions

Installation

1. Choose a suitable location for the sensor module.
2. Connect the power supply within the specified voltage range (2.2V to 5.5V).

Data Reading
Retrieve temperature and humidity data from the sensor module using the appropriate interface.

Maintenance
Keep the sensor module clean and free from dust or debris.

Frequently Asked Questions (FAQ)

• Q: What is the operating temperature range of the ZS13 sensor module?
  A: The operating temperature range is from X°C to Y°C.

• Q: Can the ZS13 sensor module be used outdoors?
  A: Yes, the sensor module can be used outdoors but ensure it is protected from direct exposure to elements.

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 c omponents inside of the sensor, we shall not be responsible for the loss.
The specific such as color, appearance , sizes etc, please in kind prevail. We are devoting ourselves to products develop ment and technical innovation , so we r eserve the right to improve the products without notice. Please confirm it is the valid version before using this manual. At the same time, users’ comments on optimized using way are welcome. Please keep the manual properly, in order to get help if you have questions during the usage in the future.
Zhengzhou Winsen Electronics Technology CO., LTD

Overview

ZS13 is a brand new product, which is equipped with special ASIC sensor chip, a high-performance semiconductor silicon-based capacitive humidity sensor and a standard on-chip temperature sensor, it uses standard I²C output signal format. ZS13 products have stable performance in high temperature and high humidity environment; At the same time, the product has great advantages in accuracy, response time and measurement range. Each sensor is strictly calibrated and tested before leaving the factory to ensure and meet the large- scale application of customers.

Features

• Fully calibrated
• Wide power supply voltage range, from 2.2V to 5.5V
• Digital output, standard I²C signal
• Quick response and strong anti-interference ability
• Excellent long-term stability under high humidity conditions

Application

• Home appliance fields: HVAC, dehumidifiers, smart thermostats, and room monitors etcs;
• Industrial fields: Automobiles, testing equipment, and automatic control devices;
• Other fields: data loggers, weather stations, medical and other related temperature and humidity detection devices.

Technical parameters of relative humidity

Relative humidity

Accuracy error1

| ****

Typical

| –| ****

±2

| Refer to

Figure 1

| ****

%RH

Repeatability| –| –| ±0.1| –| %RH
Hysteresis| –| –| ±1.0| –| %RH
Non-linearity| –| –| <0.1| –| %RH
Response time2| τ63 %| –| <8| –| s
Working Range 3| –| 0| –| 100| %RH
Prolonged Drift4| Normal| –| < 1| –| %RH/yr

Technical parameters of temperature

Accuracy error5

| Typical| –| ±0.3| –| °C
Max| See figure 2| | –
Repeatability| –| –| ±0.1| –| °C
Hysteresis| –| –| ±0.1| –| °C
Response time6| ****

τ63%

| ****

5

| ****

–

| ****

30

| ****

s

Working Range| –| -40| –| 85| °C
Prolonged Drift| –| –| <0.04| –| °C/yr

Electrical characteristics

Power Supply, IDD7

| Sleep| –| 250| –| nA
Measure| –| 980| –| µA

Consumption8

| Sleep| –| –| 0.8| µW
Measure| –| 3.2| –| mW
Communication Format| I2C

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 airflow.
3. Normal working range: 0-80% RH. Beyond this range, the sensor reading will deviate (after 200 hours under 90% RH humidity, it will temporarily drift < 3% RH). The working range is further limited to – 40 – 85 ℃.
4. If there are volatile solvents, pungent tapes, adhesives and packaging materials around the sensor, the reading may be offset.
5. The accuracy of the sensor is 25℃ under the factory power supply condition. This value excludes hysteresis and nonlinearity and applies only to non-condensing conditions.
6. The response time depends on the thermal conductivity of the sensor substrate.
7. The minimum and maximum supply current are based on VDD = 3.3V and T < 60 ℃.
8. The minimum and maximum power consumption are based on VDD = 3.3V and T < 60 ℃.

Interface definition

Sensor Communication

ZS13 uses standard I2C protocol for communication.

Start sensor
The first step is to power on the sensor at the selected VDD power supply voltage (range between 2.2V and 5.5V). After power on, the sensor needs a stabilization time of no less than 100ms (at this time, SCL is high level) to reach the idle state to be ready for receiving the command sent by the host (MCU).

Start/Stop Sequence
Each transmission sequence starts with the Start state and ends with the Stop state, as shown in Fig 9 and Fig 10.

Note: When SCL is high, SDA is converted from high to low. The start state is a special bus state controlled by the master, indicating the start of the slave transfer (after Start, the BUS is generally considered to be in a busy state)

Note: When SCL is high, the SDA line changes from low to high. The stop state is a special bus state controlled by the master, indicating the end of the slave transmission (after Stop, the BUS is generally considered to be in an idle state).

Transmission of command
The first byte of I²C that is subsequently transmitted includes the 7-bit I²C device address 0x38 and an SDA direction bit x (read R: ‘1’, write W: ‘0’). After the 8th falling edge of the SCL clock, pull down the SDA pin (ACK bit) to indicate that the sensor data is received normally. After sending measure command 0xAC, MCU should wait until the measurement is completed.

Table 5 Status bit description:

status
---|---|---
Bit[6:5]| Retain| Retain
Bit[4]| Retain| Retain
Bit[3]| CAL Enable| 1 –calibrated 0 –uncalibrated
Bit[2:0]| Retain| Retain

Sensor reading process

1. 40ms waiting time is required after power-on. Before reading the temperature and humidity value, check whether the calibration enables bit (Bit[3]) is 1 or not (you can get a status byte by sending 0x71). If it’s not 1, send the 0xBE command (initialization), this command has two bytes, the first byte is 0x08, and the second byte is 0x00.
2. Send the 0xAC command (measurement trigger) directly. This command has two bytes, the first byte is 0x33, and the second byte is 0x00.
3. Wait for 75 ms for the measurement to be completed, and Bit[7] of the busy indicator is 0, and then six bytes can be read (read 0X71).
4. Calculate the temperature and humidity value.
   Note: The calibration status check in the first step only needs to be checked when the power is turned on, which is not required during the normal reading process.

To trigger measurement:

To read humidity and temperature data:

Serial Data SDA
SDA pin is used for data input and output of sensor. When sending a command to the sensor, SDA is valid on the rising edge of the serial clock (SCL), and when SCL is high, SDA must remain stable. After the falling edge of SCL, the SDA value can be changed. In order to ensure communication security, the effective time of SDA should be extended to TSU and tho before the rising edge and after the falling edge of SCL respectively. When reading data from the sensor, SDA is effective (TV) after SCL becomes low and maintained to the falling edge of the next SCL.

In order to avoid signal conflict, the microprocessor (MCU) must only drive SDA and SCL at low level. An external pull-up resistor (e.g. 4.7K Ω) is required to pull the signal to high level. The pull-up resistor has been included in the I / O circuit of the microprocessor of ZS13. Detailed information on the input/output characteristics of the sensor can be obtained by referring to tables 6 and 7.

Note:

1. When the product is used in the circuit, the power supply voltage of the host MCU must be consistent with the sensor.
2. In order to further improve the reliability of the system, the sensor power supply can be controlled.
3. When the system is just powered on, give priority to supplying power to the sensor VDD, and set the SCL and SDA high level after 5ms.

Relative humidity conversion
The relative humidity RH can be calculated according to the relative humidity signal SRH output by SDA through the following formula (the result is expressed in% RH).

Temperature conversion
The temperature T can be calculated by substituting the temperature output signal ST into the following formula (the result is expressed in temperature ℃).

Product Dimension

Performance Supplement

Suggested working environment
The sensor has stable performance within the recommended working range, as shown in Figure 7. Long-term exposure in the non-recommended range, such as high humidity, may cause temporary signal drift (for example, >80%RH, drift +3% RH after 60 hours). After returning to the recommended range environment, the sensor will gradually return to the calibration state. Long-term exposure to the non-recommended range may accelerate the aging of the product.

RH accuracy at different temperatures
Figure 8 shows the maximum humidity error for other temperature ranges.

Application guide

environment instructions
Reflow soldering or wave soldering is prohibited for products. For manual welding, the contact time must be less than 5 seconds under a 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, the sensor reading will drift. The sensor can also be placed in a natural environment (> 40% RH) for more than 2 days to rehydrate it. The use of low-temperature solder (such as 180 ℃) can reduce the hydration time.
Do not use the sensor in corrosive gases or in environments with condensate.

Storage Conditions and Operating Instructions
Humidity sensitivity level (MSL) is 1, according to IPC/JEDECJ-STD-020 standard. Therefore, it is recommended to use it within one year after shipment. 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 original packaging, we recommend storing them in antistatic bags made of metal-containing PET/AL /CPE materials. In the process of production and transportation, the sensor should avoid contact with high concentrations of chemical solvents and long-term exposure. Avoid contact with volatile glue, tape, stickers or volatile packaging materials, such as foam foil, foam materials, etc. The production area should be well-ventilated.

Recovery Processing
As mentioned above, the readings can drift if the sensor is exposed to extreme operating conditions or chemical vapors. It can be restored to the calibration state by the following processing.

1. Drying: Keep it at 80-85 ℃ and <5% RH humidity for 10 hours;
2. Re-hydration: Keep it at 20-30 ℃ and >75% RH humidity for 24 hours.

Temperature Effect
The relative humidity of gases depends largely on temperature. Therefore, when measuring humidity, all sensors measuring the same humidity should work at the same temperature as possible. When testing, it is necessary to ensure that the same temperature, and then compare the humidity readings. High measurement frequency will also affect the measurement accuracy, because the temperature of the sensor itself will increase as the measurement frequency increases. To ensure that its own temperature rise is below 0.1°C, the activation time of ZS13 should not exceed 10% of the measurement time. It is recommended to measure the data every 2 seconds.

Materials for sealing and encapsulation
Many materials absorb moisture and will act as a buffer, which increases response time and hysteresis. Therefore, the material of the surrounding sensor should be selected carefully. Recommended materials are: metal materials, LCP, POM (Delrin), PTFE (Teflon), PE, peek, PP, Pb, PPS, PSU, PVDF, PVF. Materials for sealing and bonding (conservative recommendation): it is recommended to use the method filled with epoxy resin for the packaging of electronic components, or silicone resin. Gases released from these materials may also contaminate ZS13 (see 2.2). Therefore, the sensor should be finally assembled and placed in a well-ventilated place, or dried in an environment of

50 ℃ for 24 hours, so that it can release the polluting gas before packaging.

Wiring rules and signal integrity
If the SCL and SDA signal lines are parallel and very close to each other, it may lead to signal crosstalk and communication failure. The solution is to place VDD or GND between two signal lines, separate the signal lines, and use shielded cables. In addition, reducing the SCL frequency may also improve the integrity of signal transmission.

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 without obtaining any application licenses and authorizations, the buyer will bear all the compensation for personal injury and death arising therefrom, and exempt Winsen’s managers and employees and affiliated subsidiaries from this , Agents, distributors, etc. may incur any claims, including: various costs, compensation fees, attorney fees, etc.

ESD Protection
Due to the inherent design of the component, it is sensitive to static electricity. In order to prevent the damage caused by static electricity or reduce the performance of the product, please take necessary anti-static measures when using this product.

Quality Assurance
The company provides a 12-month (1-year) quality guarantee (calculated from the date of shipment) to direct purchasers of its products, based on the technical specifications in the product data manual published by Winsen. If the product is proved to be defective during the warranty period, the company will provide free repair or replacement. Users need to satisfy the following conditions:

1. Notify our company in writing within 14 days after the defect is found.
2. The product should be within the warranty period.

The company is only responsible for products that are defective when used in applications that meet the technical conditions of the product. The company does not make any guarantees, guarantees or written statements about the application of its products in those special applications. At the same time, the company does not make any promises about the reliability of its products when applied to products or circuits.

Zhengzhou Winsen Electronics Technology Co., Ltd
Add: No.299, Jinsuo Road, National Hi-Tech Zone, Zhengzhou 450001 China
Tel: +86-371-67169097/67169670
Fax: +86-371-60932988
E-mail: sales@winsensor.com
Website: www.winsen-sensor.com

References

• Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics
• Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics

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