AN2491 datasheet(14/32 Pages) STMICROELECTRONICS

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Functions

AN2491

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Functions

STW8110x has 3 bits which are programmable in I2C mode. This means that eight

STW8110x devices should be connected to the same I2C master.

The choice of device is performed via the 3 programmable address bits (A2, A1, A0 set to

0V (0) or 3.3V (1)). This is why, if I2C mode is selected, some functions require a

supplementary parameter which specifies the address of the device to access I2C_ADD (0

to 7).

5.1

Both modes

STW8110x_Init()

Description

Initializes the STW8110x HCL.

Definition

t_stw8110x_error STW8110x_Init(

t_stw8110x_Config *Device_config_init

#ifdef __INTERFACE_I2C

,t_uint8 I2C_ADD

#endif

);

Arguments

Both modes (out)

I2C mode (in)

Device_config_init

: Structure containing default config of device

I2C_ADD

: Address of STW8110x device (only I2C mode)

Return value

t_stw8110x_error

FunctionType

Synchronous

Comments

Potential errors:

– Both modes:

–I2C modes:

ERR_BAD_DEVICE

ERR_I2C_ACK

ERR_I2C_READ

The routine initializes the device configuration descriptor. If I2C mode is

selected, a read of the read only register is performed to check if the selected

target matches with the accessed device.

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