TDA7427 datasheet(12/21 Pages) STMICROELECTRONICS

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dress being transmitted.

After this comparison, the TDA7427 will generate

an ”acknowledge” on the SDA line and will per-

form either a read or write operation according to

the state of R/W bit.

Write Operation

Following a START condition the master sends a

slave address word with the R/W bit set to ”0”.

The TDA7427 will ”acknowledge” after this first

transmission and wait for a second word (the

word address field).

This 8 bit address field provides an access to any

of the 8 internal addresses. Upon receipt of the

word address the TDA7427 slave device will re-

spond with an ”acknowledge”. At this time, all the

following words transmitted to the TDA7427 will

be considered as Data. The internal address will

be automatically incremented. After each word re-

ceipt the TDA7427 will answer with an ”acknow-

ledge”.

SOFTWARE SPECIFICATION

2C Protocol

The interface protocol comprises:

A start condition (s)

A chip address byte (the LSB determines

read/write transmission)

A sub-address byte.

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

CHIP ADDRESS

MSB

LSB

110

100

SUBADDRESS

MSB

LSB

FUNCTION

0000

Charge pump control

0001

PLL counter 1 (LSB)

0010

PLL counter 2 (MSB)

0011

PLL reference counter 1 (LSB)

0100

PLL reference counter 2 (MSB)

0101

PLL lockdetector control and PLL mode select

0110

IFC reference counter 1 (LSB)

0111

IFC reference counter 2 (MSB) and IFC mode select

1000

IF counter control 1

1001

IF counter control 2

1010

Oscillator adjust

1011

Port extension

page mode off

page mode enabled

T1, T2, T3 used for testing, in application mode they have to be ”0”

CHIP ADDRESS

SUBADDRESS

DATA 1 to DATA n

MSB

LSB

MSB

LSB

MSB

LSB

1100010

R/W ACK T

A3 A2 A1 A0 ACK

DATA

ACK

ACK = Acknowledge

S = Start

P = Stop

I = Auto Increment

T = used for testing (in application mode they have to be ” 0”)

MAX CLOCK SPEED 400kbits/s

TDA7427

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