AM2315

AM2315 ETC1 | Alldatasheet

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Digital temperature and humidity sensor AM2315 Product Manual www.aosong.com

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 1 - 1、Product Overview AM2315 capacitive humidity sensing digital temperature and humidity sensor is one that contains the temperature and humidity combined sensor has been calibrated digital signal output. Special temperature and humidity acquisition technology, to ensure that the product has high reliability and excellent long-term stability. The sensor includes a capacitive sensor wet components and an integrated high-precision temperature measurement devices, and connected with a high-performance microprocessor. The product has excellent quality, fast response, strong anti-jamming capability, and high cost. AM2315 communication standard I2C communication. I2C communication standard communication timing, the user can be directly linked to on the I2C communication bus, no additional wiring, simple to use. Transmission of digital data output directly compensated by the temperature, humidity, temperature and Check (CRC) and other digital information, the user does not need the digital output for the second calculation, and no need for temperature compensation of the humidity, you can get an accurate temperature and humidity information . Product of four leads, convenient connection, special packages according to user needs. Physical map Dimensions (unit: mm) 2、Applications HVAC air conditioners, dehumidifiers, testing and inspection equipment, consumer goods, automotive, automation, data loggers, weather stations, home appliances, humidifiers, medical, and other related humidity measurement and control. 3、Features Completely interchangeable, low cost, long-term stability, relative humidity and temperature measurement, long distance signal transmission, digital signal output, precise calibration, low power consumption, standard I C bus digital interface. 4、Interface definition

4.1 AM2315 pin assignment

Table 1: AM2315 pin assignment Pin Color Name Description 1 Red VDD Power (3.3V-5.5V)

2 Yellow SDA Serial data, bidirectional

3 Black GND Ground

4 White SCL Serial Clock, input

Figure 1: AM2315wiring diagram

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 2 -

4.2 Power supply pins（VDD GND）

AM2315 supply voltage range of 3.3 - 5.5V, recommended supply voltage is 5V.

4.3 Data line（SDA SCL）

C communication signal line when the clock line, SCL used for communication between the microprocessor and the AM2315 synchronous. SDA pin is tri-state structure for reading, writing sensor data. Specific communication timing, see a detailed description of communication protocols. 5、Sensor Performance

5.1 Relative Humidity

Table 2: AM2315 relative humidity performance table Parameter Condition min typ max Unit Resolution 0.1 %RH Range 0 99.9 %RH Accuracy [1] 25℃ ±2 %RH Repeatability ±0.1 %RH Exchange Completely interchangeable Response [2] 1/e(63%) <5 S Sluggish <0.3 %RH Drift [3] Typical <0.5 %RH/yr Figure 2: 25 ℃ relative humidity when the AM2315 maximum error Figure 3: The maximum temperature error of temperature sensor 6、Electrical Characteristics Electrical characteristics, such as energy consumption, high, low, input, output voltage, depends on power. Table 4 details the AM2315 electrical characteristics, if not stated otherwise supply voltage of 5V. For best results with the sensors, design strictly in accordance with Table 4 and Table 6 of the conditions of the design.

5.2 Temperature

Table 3: AM2315 relative temperature performance table Parameter Condition min typ max Unit Resolution 0.1 ℃ 16 bit Accuracy ±0.1 ±1 ℃ Range -40 125 ℃ Repeat ±0.2 ℃ Exchange Completely interchangeable Response 1/e(63%) <5 S Drift ±0.1 ℃/yr

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 3 - Table 4: AM2315 DC Characteristics。 Parameter Condition min typ max Unit Supply voltage 3.3 5 5.5 V Power [4] Dormancy 10 15 µA Measuring 500 µA Average 300 µA Low-level output IOL [5] 0 300 mV High output Rp<25 kΩ 90% 100% VDD Low input voltage Decline 0 30% VDD Input High Rise 70% 100% VDD Rpu [6] VDD = 5V VIN = VSS 30 45 60 kΩ Output current On 8 mA Off 10 20 µA Sampling period 2 S 7、I C Communication protocol 7.1 I C communication protocol introduced 7.1.1 I C About the bus AM2315 and micro-processor control interface form of the I C serial bus, in this brief introduction about the I C bus protocol standard. Due to space limitations, the agreement can not list the entire contents of a deeper problem, please refer to the relevant information (refer to the Philips site inspection). 7.1.2 I C Bus Overview Philips (Philips) at 20 years ago invented a simple two-way two-wire serial communication bus, the bus is known as the Inter-I C bus. I C bus has now become the industry standard solution for embedded applications, is widely used in variety of microcontroller-based professional, consumer and telecommunications products, as a control, diagnostics and power management bus. More in line with standard I C bus devices can communicate with an I C bus, without the need to address decoder. I C bus only composed by the two signal lines, a serial data line SDA, the other root is the serial clock line SCL. I C bus devices generally have their SDA and SCL pins are open-drain (or open collector) output structure. Therefore, the actual use, SDA and SCL signal lines must be pull-up resistor (Rp, Pull-Up Resistor). Pull-up resistor on the general value of 3 ~ 10 kΩ . Therefore, when the bus is free, the two signal lines remain high, almost no current consumption; electrical compatibility, and supports a variety of different voltage logic interface; different between the two can be directly connected to the bus, not require additional conversion circuitry to support a variety of ways a master multi-slave communication is the most common means of communication. It also supports dual-host communications, multi-host communications, and broadcast mode, and so on. I C typical configuration is shown in Figure 4。 [1] The accuracy of the factory test, the sensor at 25 ℃ and 5V, the accuracy of indicators under the conditions tested, it does not include hysteresis and non-linear, and only for non-condensing environment. [2] at 25 ℃ and 1m / s air flow conditions, to reach 63% of first-order response time required. [3] in volatile organic compounds, the values may be higher. See manual application to store information. [4] This value is VDD = 5.0V, when the temperature is 25 ℃, 2S / time, average conditions. [5] low output current. [6] that pull-up resistor.

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 4 - Figure 4：I C typical configuration 7.1.3 I C Bus protocol specification ◎ I C Bus Definition of Terms I C-bus serial data (SDA) and serial clock (SCL) line connected to the bus, allowing the device to transmit information between each device has a unique address identification, and can be used as a transmitter or receiver (the device features decision), the device performs data transmission can also be seen as a master or a slave, the host is initialized bus allows data transfer and generates the clock signal transmission device. At this point, any device addressed is considered a slave. Details of the I C bus definition of terms in Table 5. ◎ I C Bus transfer rate I C Bus communication speed controlled by the host, to fast to slow. However, the maximum rate is limited, I C bus data transfer rate up to the standard mode, fast 100Kb /s. ◎ I C Bus bit transmission I C Bus bit transmission is through the data line SDA and SCL line to complete the two lines together. In the high period of SCL clock line, data line SDA low logic level, said current transmission "0"; in the high period of SCL clock line, data line SDA high logic level, said current transmission "1." Logic "0" (low) and "1" (high) level, is related by the VDD voltage level (for details see Table 4 AM2315 DC Characteristics table). In addition, each data bit transferred on to generate a clock pulse. Table 5：I C Bus definitions of terms Term Description Transmitter Devices to send data to the bus Receiver Device receiving data from the bus Host Initialization and termination of the clock signal sent sent produce devices From machine Addressed by the host device Multi-host At the same time try to control more than one host, but does not destroy the message bus. Arbitration It's a multiple hosts simultaneously try to control the bus but only one is allowed to control the bus and make the message is not destroyed in the process. Synchronous Two or more devices synchronized clock signal in the process

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 7 - ◎ Schematic diagram of the basic data transfer format Figure 10 and Figure 11 are given the I C data transmit and receive the basic format. It should be noted, Figure 11 and Figure 12 is different, in Figure 11, the host sends to the last byte from the data, the response from the machine may or may not answer, but in any case the host can generate stop condition. If the host sends data to the slave (even including slave address) when the detected non-response from the machine, you should promptly stop the transmission. Figure 10： I C The bus master sends data to the basic format from Figure 11： I CThe bus master receives data from the slave's basic format

7.2 AM2315 Sensor I

C bus serial interface, in full accordance with the standard I2C protocol addressing, can be directly linked to the I C bus. AM2315 sensor I2C address (SLAVE ADDRESS) is 0xB8, the I C bus protocol based on the standard, based on ModBus protocol, developed a unique communication protocol, reducing the transmission error rate. Microcontroller read AM2315 sensor, the sensor I C_ModBus in strict accordance with AM2315 communication protocol and timing design. 7.2.1 I C Interface Description AM2315 digital temperature and humidity sensor as a slave, and the host (user microprocessor) way communication between the I C bus standard mode. For the accurate measurement of humidity, temperature and humidity to reduce the impact, AM2315 sensors in the non-working period, automatically be converted to sleep, to reduce the work consumption, to reduce the sensor self-heating of the humidity of the surrounding environment. AM2315 uses passive mode, that is, the host through the instruction wake-up sensor, and then sends the appropriate commands, read the corresponding values of temperature and humidity; communication after the acquisition of temperature and humidity sensor is triggered once; so if the long did not read the sensor, please read the two consecutive second sensor (minimum interval of two to read 2S), the second is the latest measured value; collected after the end of the sensor automatically be converted to sleep. Next host to be read sensor, the need to re-awaken the sensor. Must be noted that host communication from start to finish, for a maximum of 3S. If communication is not completed within 3S, sensors automatically end communication, automatically be converted to sleep, read again the host, such as sensors, need to re-send the wake-up command.

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 8 - 7.2.2 I C Interface Features This section describes the AM2315 Sensor I C interface characteristics, if you want to get the best communications with the sensor results, designed strictly in accordance with Figure 12 and Table 6 of condition design.。 Figure 12：AM2315 Typical application circuit and the I2C bus timing diagram Table 6：AM2315 Sensor I C interface characteristics Symbol Parameters Standard I C mode Unit min max SCLClock frequency 100 kHz tw(SCLL) SCLClock low time 4.7 μs tw(SCLH) SCLClock high time 4.0 tsu(SDA) SDA Setup time 250 ns th(SDA) SDA Data hold time 0 [1] tr(SDA) tr(SCL) SDA & SCL Rise time 1000 tf(SDA) tf(SCL) SDA & SCL Fall Time 300 th(STA) Start condition hold time 4.0 μs tsu(STA) Repeated START condition setup time 4.7 tsu(STO) Stop condition setup time 4.0 μs tw(STO:STA) Stop to Start condition time (bus free) 4.7 μs Cb Capacitive load for each bus 400 pF

7.2.3 Communication protocol

C communication protocol is a standard I C bus protocol based on the reference ModBus protocol, the sensor according to AM2315 own characteristics, a combination of I C_ModBus agreement. The following format:：

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 9 - ◎ Communication data (information frame) format I CAdd+R/W Function code Data area CRC Check [3] 1Byte [2] 1Byte ＮByte 16-bit CRC (cycle redundancy code) [1] If the interface does not allow to extend the time low, only need to comply with the longest hold time Start condition. [2] A byte consists of 8-bit binary number (both 8 bit). [3] CRC checksum algorithm, for details see: CRC code calculation method; detailed below. ◎ Communication and information transfer process When the communication command from the sending device (host) to the sensor, I C address of the command line with the sensor, the sensor was to receive, and in accordance with the relevant requirements of the function code and read the information; and the implementation of the results (data) back to the host. The information returned includes the function code, data and after the implementation of the CRC code (user time to read the CRC, stop conditions can be sent directly). ◎ Communication I C slave address AM2315 I C addresses are the same for each sensor, and is 0xB8. Therefore, in the same bus can only be linked to a AM2315 sensor, the sensor only after receiving the start signal and the same with its I C address only to respond to the host. ◎ I C communication function code Communication of information for each function code is the first byte of the frame transmission. I C_ModBus communication rules, define the function code is 1 to 127. As a host request, through the function code tells the slave what action should be implemented. Response as a slave, the slave returns the function code and the functions from the host to send the same code, it indicates that the response from the host machine and have been associated operations. I C_ModBus part of the function codes described in Table 7. Table 7：I C_ModBus Part of the function code Function code Definition Operations (binary) 0x03 Read register data Read data from one or more registers 0x10 Write multiple registers Multiple sets of binary data is written to multiple registers ◎ I C communication data area Data area including the need to return to what information from the sensor or perform any action. This information can be data (such as: temperature, humidity, the sensor device information, user-written data, etc.), the reference address. For example, the host told the sensor 03 through the function code value return register (read register contains the starting address and length of register read), the returned data includes the length of the data register and data register contents. Data format： Data length：

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 10 - I C_Modbus sensor uses a custom communication protocol, host, use of communication commands (function code 03), can read the data register any of its data register table shown in Table 8. Sensor temperature and humidity data register stores the value and the corresponding sensor signal equipment and other related information; each data register is a single byte (8 bits) of binary data; read sensor, up to 10 registers of data, more than reading take the length of the sensor will return the corresponding error code. Error code information, see Table 1. Table 8：AM2315 Data register table Register information Add Register information Add Register information Add Register information Add High RH 0x00 Model high 0x08 Users register a high 0x10 Retention 0x18 Low RH 0x01 Model low 0x09 Users register a low 0x11 Retention 0x19 High temp. 0x02 Version number 0x0A Users register 2 high 0x12 Retention 0x1A Low temp. 0x03 ID(24-31) Bit 0x0B Users register 2 low 0x13 Retention 0x1B Retention 0x04 ID(16-23) Bit 0x0C Retention 0x14 Retention 0x1C Retention 0x05 ID(8 - 15) Bit 0x0D Retention 0x15 Retention 0x1D Retention 0x06 ID(0 - 7 ) Bit 0x0E Retention 0x16 Retention 0x1E Retention 0x07 Status Register 0x0F Retention 0x17 Retention 0x1F ◎ Temperature output format Temperature resolution is 16Bit, the maximum temperature position (Bit15) equal to 1 indicates a negative temperature, the temperature highest (Bit15) is equal to 0 for positive temperature; temperature in addition to highest (Bit14 ~ Bit0) that string out of the temperature sensor. String out of the temperature sensor is 10 times the actual temperature； ◎ Status Register Status register, Bit7-Bit0 bit, temporarily reserved Status register bits Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Features Retention ◎ I C_ModBus Function Code Description 一、Function code “03”：Read multiple sensors register Host sends a read frame format： START+ (I CAddress+W )+ Function code（0x03）+ Start address + Register number +STOP The host to read back the data： START+ (I C Add+R )+ Continuously read sensor data returned +STOP Sensor response frame format： Function code（0x03）+ Register number + Data +CRC [1] for example：The host continues to read sensor data: 0x00 start address register of the four sensor data. Sensor data register address and data：

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 11 - Register add Register data Data on Register add Register data Data on 0x00 0x01 High RH 0x02 0x00 High temp. 0x01 0xF4 Low RH 0x03 0xFA Low temp. Host sends the message format： Sensor response to the return message format： Numerical： Read back from the sensor temperature and humidity values, as long as the value into a decimal number 10 is divided by the value corresponding to the temperature and humidity, the temperature of the corresponding unit ℃, humidity units of % RH. For example, read back the data above: Humidity: 01F4 = 1 ×256+15×16+4 = 500 => Humidity = 500÷10=50.0%RH;  Note： CRC verification code CRC is calculated by the code to arrive, and then pass the CRC and the sensor compared; the same, the data is received correctly, or that the data has errors. 二、 Function code "10": write multiple registers to sensor The host can use this function code multiple data stored in the register to the sensor. AM2315 sensors register a single one-byte or 8 bits. Sensors allow you to save a maximum of 10 Host sends Bytes message Remarks Sensor add 1 0xB8 Sensor I C address（0xB8）+W（0） Function code 1 0x03 Read the register Start add 1 0x00 Register start add 0x00 Register No. 1 0x04 Read the register number Response from machine Bytes Send Remarks Function code 1 0x03 Read the register Returns No. of bytes 1 0x04 Back 4 of 4 bytes register Register 1 1 0x01 Add 0x00 of the content (RH high byte) Register 2 1 0xF4 Add 0x01 of the content (RH low byte) Register 3 1 0x00 Add the content of 0x02 (temp. high byte) 寄存器 4 1 0xFA Add 0x03 of the content (temp. low byte) CRC 码 2 31A5 Back to the CRC, the low byte first ; [1]： Details of the CRC calculations see the back of the CRC introduced, the sensor returns all the data are CRC check, the user can choose to read or not read。

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 12 - data registers. Therefore, the host single sensor to save up to 10 registers. More than 10, the sensor will return the corresponding error code. Host sends write frame format： START+(I C Add+W )+ Function code (0x10)+ Start address + Register number + Save the data +CRC+STOP Confirm the host to read instructions： START+(I C Add+R )+ Read the sensor data returned +STOP Sensor response frame format： Function code（0x10）+ Start Add + Register number +CRC For example：Should save the address of the host 01, 02 10, 11 of the sensor to register. Host sends the message format: Sensor response to the return message format： ◎ CRC Check Host or check code can be used to discriminate the sensor to receive inform ation is correct. As the electronic noise or some other interference, the information during transmission error sometimes occurs, the error check code (CRC) can verify that the host or sensor data transmission process in the communication of information is wrong, wrong data can be discarded (either send or receive), which increases the system's security and efficiency. I C_ModBus protocol of CRC (cycle redundancy code) consists of 2 bytes, or 16-bit binary number. CRC code from the sending device (host), is placed in the rear send a message frame, I C address is not included in the CRC calculation. CRC are either sent or received by the low byte first, high byte format after sending. Host sends Bytes Send Remarks Sensor Add 1 0xB8 Sensor I C Add （0xB8）+W（0） Function code 1 0x10 Write multiple registers Start Add 1 0x10 To write the start address register Byte length 1 0x02 Save the data word length (2 Byte ) Data 1 1 0x01 Save the data (address: 10) Data 2 1 0x02 Save the data (address: 11) CRC Code 2 C092 Host calculated CRC code, low byte first C addresses not included in the CRC calculation) Response from machine Bytes Send message Remarks Function Code 1 0x10 Write multiple registers Start address 1 0x10 Save the start address Save the data length 1 0x02 Sensors save data length CRC Code 2 FC04 Sensors return the CRC calculation, the low byte first ;

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 13 - Receive information (sensors) and then recalculate the information rec eived by the CRC, the CRC is calculated by comparing the receiver to match, if they do not match, then the error. Users need special Do note that the sensor reading instruction without adding the CRC; write sensor, the CRC must increase; and all the return data are CRC. ◎ CRC code is calculated 1．Preset a 16-bit registers as hexadecimal FFFF (that is, all 1); call this register is the CRC register; 2．The first 8 -bit binary data (communication of information both the first byte of the frame) and 16-bit CRC register, or the lower 8 bits are different, the results put in the CRC register; 3．The CRC register right one (towards low) with 0 fill the highest place, and check out right after the bit; 4．If out of the bit is 0: Repeat Step 3 (again shifted to the right one); if out of place as 1: CRC register with the polynomial A001 (1010 0000 0000 0001) XOR; 5．Repeat steps 3 and 4, until the right 8 times, so that all of the 8-bit data were processed; 6．Repeat steps 2 through 5, the communication frame to the n ext byte of information processing; 7．All bytes of the communication of information frames calculated according to the above steps completed, the resulting 16-bit CRC register is the high and low bytes are exchanged; 8．Finally, get the contents of the CRC register is: CRC code. ◎ CRC code calculation code in C language Description: This program calculates the length of * ptr within the first len bytes of the CRC. unsigned short crc16(unsigned char *ptr, unsigned char len) unsigned short crc=0xFFFF; unsigned char i; while(len--) crc ^=*ptr++; for(i=0;i<8;i++) if(crc & 0x01) crc>>=1; crc^=0xA001; }else crc>>=1; return crc; 7.2.4 I C Communication Timing AM2315 sensor I C communication, although communication is based on standard I C timing, but

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 15 - (register length) + STOP Figure 15：Sends a read command example temperature and humidity Step three data read back or confirmation signal Send read / write command, the host must wait at least 1.5ms, and then send a read sequence, to read back the data example shown in Figure 16; to note is that you read the data, finished his I2C address is required wait at least 30μ s before sending over the next serial clock, the read data, or communication error will occur. Figure 16: Example values of temperature and humidity reading Data is read back to the host： 0x03(Function code)+0x04(Data length)+0x03(High humidity)+0x39(Low humidity)+ 0x01(High temperature)+0x15(Low temperature)+0xE1(CRC Low byte checksum)+ 0xFE(CRC Checksum high byte)； So： 0339H = 3×256+3×16+9 = 825 => Humidity = 825÷10=82.5%RH; 0115H = 1×256+1×16+5 = 277 => Temperature = 277÷10=27.7℃ Through the above three steps to complete all the registers of the sensor reading and writing operations (users can write registers, only five, namely, the status register, four user registers at the same time, the status register, can be written separately, otherwise an error ); users in the design, follow these three steps must be fully read and write. Sensors send the data, trigger a temperature and humidity measurement; measurement is completed, record temperature and humidity values, then a communication completed, the sensor automatically into hibernation; so long as the sensor does not read, read the second consecutive sensors, back to the second reading of the temperature and humidity for the latest value (minimum interval of continuous reading 2S).

7.2.5 Peripherals read the flow chart

AM2315 schematic diagram I2C sensor reading is shown in Figure 17, while our company also provides sample code to read C51, customers need to download, please visit our website (www.aosong.com) associated download, this manual does not provide code instructions.

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 16 - Figure 17: Sensor with I2C read flow chart

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 17 - Table 1: I C_MODBUS communication protocol summary table Read the bus Description: I2C address is 0xB8; access a maximum of 10 registers; Read the bus communication time for a maximum of a 3 S。 Each returned sensor data plus the CRC, the user can choose not to read the CRC。 Sensor reading frame format: Host frame format： (SLA+W )+ Function code（0x03）+ Start Add + Register number From the machine frame format： Function code（0x03）+ Data length + Return data +CRC Write frame format sensor: Host frame format： (SLA+W)+ Function code（0x10）+ Start Add + Register number + Save the data +CRC From the machine frame format： Function code（0x03）+ Start Add + Register number +CRC AM2315 sensor registers list: Register information Add Register information Add Register information Add Register information Add High RH 0x00 Model high 0x08 Users register 1 high 0x10 Retention 0x18 Low RH 0x01 Model low 0x09 Users register 1 low 0x11 Retention 0x19 High temp. 0x02 Version number 0x0A Users register 2 high 0x12 Retention 0x1A Low temp. 0x03 ID(24-31) Bit 0x0B Users register 2 low 0x13 Retention 0x1B Retention 0x04 ID(16-23) Bit 0x0C Retention 0x14 Retention 0x1C Retention 0x05 ID(8 - 15) Bit 0x0D Retention 0x15 Retention 0x1D Retention 0x06 ID(0 – 7 ) Bit 0x0E Retention 0x16 Retention 0x1E Retention 0x07 Status Register 0x0F Retention 0x17 Retention 0x1F Status Register Definition: Bit7-Bit0 bit reserved； Temperature format: temperature highest (Bit15) equal to 1 indicates a negative temperature, the temperature highest (Bit15) is equal to 0 for positive temperature; temperature in addition to the highest bit (Bit14 ~ Bit0) that string out of the temperature sensor. String out of the temperature sensor is 10 times the actual humidity value; Write sensor： Register is available for users to write (0x0F ~ 0x13); others prohibit write register and status register can only be written separately。 Reading and writing sample： Function code Start Add Frame data content Read temperature and humidity 0x03 0x00 Send：(SLA+W)+0x03+0x00+0x04 Return：0x03+0x04+ High RH + Low RH + High temp. + Low temp. +CRC Read the temp. 0x03 0x02 Send：(SLA+W)+0x03+0x02+0x02 Return：0x03+0x02+ High temp. + Low temp. +CRC Humidity reading 0x03 0x00 Send：(SLA+W)+0x03+0x00+0x02 Return：0x03+0x02+ Low RH+ Low RH+ CRC Read device information 0x03 0x08 Send：(SLA+W)+0x03+0x08+0x07 Return：0x03+0x07+ Model (16)+ Version (8)+ ID(32)+CRC Write Status Register 0x10 0x0F Send：(SLA+W)+0x10+0x0F+0x01+0x01+0xF4（Low）+0xB7（High） Note: Function code + register start address register number + Save + content + CRC Return：0x10+0x0F+0x01+0xB4（Low byte）+0x35（High byte） Note：Function code + register start address + register number + CRC Write user registers 1 0x10 0x10 Send：(SLA+W)+0x10+0x10+0x02+0x01+0x02+0xC0+0x92 Return：0x10+0x10+0x02+0xFC+0x04

Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 18 - Note: SLA = I2C address 0xB8. Table for the parity bit CRC, CRC for the 16-bit, low byte first, high byte in the post. Return error code: 0x80: does not support the function code 0x81: reading an illegal address 0x82: write data beyond the scope of 0x83: CRC checksum error 0x84: disable writes. 8、the license agreement Without the copyright holder's prior written permission in any form or by any means, electronic or mechanical (including photocopying), any part of this manual may be reproduced, nor may its contents be communicated to third parties. The contents are subject to change without notice. The company has a software and third-party ownership, the user only signed a contract or license the software before use. 9、warnings, and personal injury Do not use this product as safety or emergency stop devices, as well as the product failure could cause personal injury to any other application, unless there are special purpose or authorized use. In the installation, handling, use or maintenance of the product, please consult the product data sheets and application notes. Failure to comply with this proposal, likely to cause death and serious injury. The Company will not assume the resulting personal injury or death of any compensation, and thus exempt from the company's managers and employees and affiliated agents, distributors, etc. that may arise from any claims, including: a variety of costs, compensation costs, legal fees and so on. 10、Quality Assurance The company's direct purchase of their products to provide a period of 3 months quality assurance (from date of shipment). The company published the product data sheet specifications shall prevail. If the warranty period, the quality of the product proved defective indeed, the company will provide free repair or replacement. User must meet the following conditions: ① This product is found defective within 14 days of written notice to the Company; ② The product shall be paid by mail back to the company; ③ The product should be in the warranty period. The Company applied only to those who meet the technical requirements of the occasion of the product resulting from defective products responsible. Those companies for their products are used in special applications without any guarantee, warranty or written statement. The company or its products into the product reliability of the circuit does not make any promises.