SI7013-A10-IM 데이터 시트보기 (PDF) - Silicon Laboratories

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SI7013-A10-IM

I2C HUMIDITY AND TWO-ZONE TEMPERATURE SENSOR

Silicon Laboratories 

Si7013-A10

5.1. Issuing a Measurement Command

The measurement commands instruct the Si7013 to perform one of four possible measurements; Relative

Humidity, Temperature, Auxiliary Temperature, or Analog Voltage. While the measurement is in progress, the

option of either clock stretching (Hold Master Mode) or Not Acknowledging read requests (No Hold Master Mode)

is available to indicate to the master that the measurement is in progress. For Humidity and Temperature

measurements, the chosen command code determines which mode is used. For Auxiliary Temperature and Analog

Voltage measurements, No Hold Master mode can be enabled by writing a "1" to bit D6 in register 2. Note that

internal Humidity and Temperature measurements should not be made with this bit set.

Optionally, a checksum byte can be returned from the slave for use in checking for transmission errors for Relative

Humidity and Temperature measurements. The checksum byte is optional after initiating an RH or temperature

measurement with commands 0xE5, 0xF5, 0xE3 and 0xF3. The checksum byte is required for reading the

electronic ID with commands 0xFA 0x0F and 0xFC 0xC9. For all other commands, the checksum byte is not

supported. The checksum byte will follow the least significant measurement byte if it is acknowledged by the

master. The checksum byte is not returned if the master “not acknowledges” the least significant measurement

byte. The checksum byte is calculated using a CRC generator polynomial of x8 + x5 + x4 + 1 with an initialization of

0x00.

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Rev. 1.0

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