TDA7801SM datasheet(34/48 Pages) STMICROELECTRONICS

Part #	TDA7801SM

Description	Digital input quad power amplifier with built-in diagnostics features

PDF	48 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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34 / 48 page

I2C bus interface

TDA7801

34/48

DocID022674 Rev 4

I2C bus interface

Data transmission from microprocessor to the TDA7801 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).

When I2C bus is active any operating mode of the IC may be modified and the diagnostic

may be controlled and results read back.

The protocol used for the bus is depicted in Figure 38 and comprises:



a start condition (S)



a chip address byte (the LSB bit determines read/write transmission)



a subaddress byte



a sequence of data (N-bytes + acknowledge)



a stop condition (P)

Figure 38. I2C bus protocol description

Description:

S = Start

R/W = '0' => Receive-Mode (Chip could be programmed by µP)

I = Auto increment; when 1, the address is automatically increased for each byte transferred

X: not used

A = Acknowledge

P = Stop

MAX CLOCK SPEED 400kbit/sec

* = available in PowerSO36

TDA7801SM Datasheet(PDF) 34 Page - STMicroelectronics