TDA6502 datasheet(9/44 Pages) PHILIPS

9 / 44 page

2000 Mar 16

Philips Semiconductors

Preliminary speciﬁcation

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

TDA6502; TDA6502A;

TDA6503; TDA6503A

8.2

I2C-bus data format

8.2.1

I2C-BUS ADDRESS SELECTION

The module address contains programmable address

bits MA1 and MA0 (see Tables 3, 4 and 9) which offer the

possibility of having several synthesizers (up to 4) in one

system by applying a specific voltage on pin CE/AS.

The relationship between bits MA1 and MA0 and the input

voltage applied to pin CE/AS is given in Table 6.

8.2.2

WRITE MODE

The write mode is defined by the address byte ADB with

bit R/W = 0 (see Tables 3 and 4).

Data bytes can be sent to the device after the address

transmission (first byte). Four data bytes are needed to

fully program the device.

The bus transceiver has an auto-increment facility which

permits the programming of the device within one single

transmission (address byte + 4 data bytes). The device

can also be partially programmed providing that the first

data byte following the address byte is divider byte DB1 or

the control byte CB.

The first bit of byte DB1 indicates whether frequency data

(first bit = 0) or control and band-switch data (first bit = 1)

will follow. Until an I2C-bus STOP command is sent by the

controller, additional data bytes can be entered without the

need to re-address the device.

The frequency register is loaded after the 8th clock pulse

of byte DB2, the control register is loaded after the 8th

clock pulse of the byte CB and the band-switch register is

loaded after the 8th clock pulse of byte BB.

Table 3

I2C-bus data format for write mode of TDA6502 and TDA6503

Table 4

I2C-bus data format for write mode of TDA6502A and TDA6503A

NAME

BYTE

BITS

MSB

LSB

Address byte

ADB

11000

MA1

MA0

R/W=0

Divider byte 1

DB1

N14

N13

N12

N11

N10

Divider byte 2

DB2

Control byte

RSA

RSB

Band-switch byte

XXXX

FMST

PUHF

PVHFH

PVHFL