TDA7572 datasheet(29/64 Pages) STMICROELECTRONICS

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TDA7572

I2C and mode control

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The protocol used for the bus is the following 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)

Table 20.

Addresses

S = Start

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

"1" -> Transmission-Mode (Data could be received by µP)

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

X: not used

ACK = Acknowledge

P = Stop

MAX CLOCK SPEED 500kbits/s

The I2C address is user determined by pins ADDR1 and ADDR0. See table below:

Write procedure:

Two possible write procedures are possible:

without increment: the I bit is set to 0 and the register is addressed by the subaddress.

Only this register is written by the data following the subaddress byte.

with increment: the I bit is set to 1 and the first register read is the one addressed by

subaddress. Are written the register from this address up to stop bit or the reaching of

last register.

Example of write instruction with increment:

Chip address

Subaddress

Data [7:0]

MSBLSB

MSB

LSB

AAAAAA R/W ACK

AAAA

ACK

DATA

ACK P

Table 21.

I2C chip address

MSB

LSB

R/W

01000

ADDR1

ADDR0

Device

Address

R/W

Address

DATA 1

DATA 2

DATA n

0011000

ADDR

MS1

LS1

MS2

LS2

MSn

LSn

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