AN3209 datasheet(39/42 Pages) STMICROELECTRONICS

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AN3209

STTS75 I2C commands

Doc ID 17419 Rev 2

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Appendix C

STTS75 I2C commands

The M24LR64-R_Datalogger_application_firmware uses the i2c_ee.c C library to interface

with the STTS75 temperature sensor. The library is available under C:\Program

Files\M24LR64-R_Datalogger_Application\sources\M24LR64-

R_Datalogger_application_firmware or from Start > M24LR64-

R_Datalogger_Application > M24LR64-R_Datalogger_application_firmware.

The address Byte defines the address of the STTS75 on the I2C bus. It is defined by the

SENSOR_ADDRESS

global variable of the i2c_ee.c

#define SENSOR_ADDRESS

0x90

C.1

Acquire temperature

The I2C_SS_Config() function configures the STTS75 in temperature acquisition mode.

Refer to the STTS75 datasheet for a detailed description of the pointer byte and of the

corresponding registers.

Example

I2C_SS_Config (0x0183)

configures the STTS75 to perform one temperature

acquisition with a resolution of 9 bits and store the value in the 16 bits temperature register.

where

Pointer byte = 0x01

Configuration byte = 0x83

ConfigBytes = 0x0183.

C.2

Read acquired Temperature

The I2C_SS_BufferRead() function allows to read a temperature acquisition value.

Table 15.

I2C_SS_Config()

Function description

Prototype

I2C_SS_Config (uint16_t ConfigBytes)

Parameters

ConfigBytes: 2 bytes resulting from the concatenation of the Pointer byte and

Configuration byte.

Pointer byte: Bits P2 to P7 must always be set to 0. Bits P0 and P1 define the

pointer value corresponding to the register to be configured.

Configuration byte: Value to be programmed in the Configuration register. It is the

last byte of the Pointer Set Configuration Register Write frame. (see Section :

Acquire temperature). Default value is 0x00.

Returned

value

ErrorStatus:

SUCCEEDED

FAILED

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