TDA7563BH(2006) Ver la hoja de datos (PDF) - STMicroelectronics

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Fabricante

TDA7563BH
(Rev.:2006)

4 x 50 W multifunction quad power amplifier with built-in diagnostics feature

STMicroelectronics 

TDA7563B

7

I2C Bus

I2C Bus

7.1

I2C Programming/reading sequences

A correct turn on/off sequence respectful of the diagnostic timings and producing no audible

noises could be as follows (after battery connection):

– TURN-ON: PIN2 > 7V --- 10ms --- (STAND-BY OUT + DIAG ENABLE) --- 500 ms

(min) --- MUTING OUT

– TURN-OFF: MUTING IN --- 20 ms --- (DIAG DISABLE + STAND-BY IN) --- 10ms -

-- PIN2 = 0

– Car Radio Installation: PIN2 > 7V --- 10ms DIAG ENABLE (write) --- 200 ms ---

I2C read (repeat until All faults disappear).

– OFFSET TEST: Device in Play (no signal) -- OFFSET ENABLE - 30ms - I2C

reading (repeat I2C reading until high-offset message disappears).

7.2

7.2.1

7.2.2

7.2.3

7.2.4

I2C Bus interface

Data transmission from microprocessor to the TDA7563B and viceversa takes place through

the 2 wires I2C BUS interface, consisting of the two lines SDA and SCL (pull-up resistors to

positive supply voltage must be connected).

Data Validity

As shown by Figure 29, the data on the SDA line must be stable during the high period of

the clock. The HIGH and LOW state of the data line can only change when the clock signal

on the SCL line is LOW.

Start and Stop Conditions

As shown by Figure 30 a start condition is a HIGH to LOW transition of the SDA line while

SCL is HIGH. The stop condition is a LOW to HIGH transition of the SDA line while SCL is

HIGH.

Byte Format

Every byte transferred to the SDA line must contain 8 bits. Each byte must be followed by an

acknowledge bit. The MSB is transferred first.

Acknowledge

The transmitter* puts a resistive HIGH level on the SDA line during the acknowledge clock

pulse (see Figure 31). The receiver** the acknowledges has to pull-down (LOW) the SDA

line during the acknowledge clock pulse, so that the SDAline is stable LOW during this clock

pulse.

* Transmitter

– master (μP) when it writes an address to the TDA7563B

– slave (TDA7563B) when the μP reads a data byte from TDA7563B

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