STV9211 datasheet(19/37 Pages) STMICROELECTRONICS

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STV9211

Functional description

2.17

Serial interface

The 2-wire serial interface is an I2C interface. The slave address of the STV9211 is DC hex.

The host MCU can write into the STV9211 Registers. Read mode is not available.

In order to write data into the STV9211, after the “start” message, the MCU must send the

following data (see

Figure 13):

the I2C address slave byte with a low level for the R/W bit,

the byte to the internal Register address where the MCU wants to write data,

the data.

All bytes are sent with MSB bit first. The transfer of written data is ended with a “stop” message.

When transmitting several data, the Register addresses and data can be written with no need to

repeat the start and slave addresses.

2.18

Power-on reset

A power-on reset function is implemented on the STV9211 so that the I2C registers have a

determined status after power-on. The Power-on reset threshold for a rising supply on VCCA (Pin 7)

is 3.8 V (typ.) and 3.2V when the VCC decreases.

11011100

Figure 13: I2C write operation

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