SDP800 datasheet(6/14 Pages) ETC2

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Version 0.5 – January 2017

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5. Digital Interface Description

The SDP8xx-digital interface is compatible with the I2C protocol. This chapter describes the command set for SDP8xx-digital.

For detailed information about the I2C protocol, please check the document "NXP I2C-bus specification and user manual".

5.1

I2C Address

The I2C address for SDP8xx-digital is 0x25 (b 0100101). The address is followed by a read or write bit.

For other I2C addresses contact Sensirion.

5.2

I2C Sequences

The commands are 16-bit. Data is read from the sensor in multiples of 16-bit words, each followed by an 8-bit checksum to

ensure communication reliability.

I2C master writes 16 bit command

I2C master sends read header and receives multiple 16bit words with CRC byte.

Dark areas with white text indicate that the sensor controls the SDA (Data) line.

I2C sequences can be aborted with a NACK and STOP condition.

5.3

I2C Commands

The command set of the SDP8xx-digital consists of a set of different commands:

Continuous measurement

Start Continuous measurement commands

Stop measurement command

Triggered measurement commands

Soft reset

Entering and exiting sleep mode

Read product identifier and serial number

I2CAdr[6:0]

Cmd[15:8]

Cmd[7:0]

I2CAdr[6:0]

Data1[15:8]

Data1[7:0]

CRC1[7:0]

Data2[15:8]

Data2[7:0]

CRC2[7:0]

DataX[15:8]

DataX[7:0]

CRCX[7:0]

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