TDA9850 データシートの表示（PDF） - Philips Electronics

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TDA9850

I2C-bus controlled BTSC stereo/SAP decoder

Philips Electronics 

Philips Semiconductors

I2C-bus controlled BTSC stereo/SAP decoder

Preliminary specification

TDA9850

I2C-BUS PROTOCOL

I2C-bus format to read (slave transmits data)

S

SLAVE ADDRESS

R/W

A

DATA

MA

DATA

Table 1 Explanation of I2C-bus format to read (slave transmits data)

NAME

S

Standard SLAVE ADDRESS (MAD)

Pin programmable SLAVE ADDRESS

R/W

A

DATA

MA

P

DESCRIPTION

START condition; generated by the master

1011011 pin MAD not connected

1011010 pin MAD connected to ground

1 (read); generated by the master

acknowledge; generated by the slave

slave transmits an 8-bit data word

acknowledge; generated by the master

STOP condition; generated by the master

Table 2 Definition of the transmitted bytes after read condition

FUNCTION

Alignment read 1

Alignment read 2

BYTE

ALR1

ALR2

MSB

D7

D6

D5

D4

D3

D2

D1

Y SAPP STP A14 A13 A12 A11

Y SAPP STP A24 A23 A22 A21

Table 3 Function of the bits in Table 2

STP

SAPP

A1X to A2X

A1X

A2X

Y

BITS

FUNCTION

stereo pilot identification (stereo received = 1)

SAP pilot identification (SAP received = 1)

stereo alignment read data

for wideband expander

for spectral expander

indefinite

P

LSB

D0

A10

A20

The master generates an acknowledge when it has received the first data word, ALR1, then the slave transmits the next

data word ALR2. The master next generates an acknowledge, then slave begins transmitting the first data word ALR1,

and so on until the master generates no acknowledge and transmits a STOP condition.

1995 Jun 19

15

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