TDA7501 datasheet(10/18 Pages) STMICROELECTRONICS

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Single supply mode

If VCC and Vdd are connected to a single supply

the maximum possible output swing is about 2.8V

rms . The output reference voltage pin can be left

open or otherwise the internal voltage divider can

be used to generate for the outputs a VCC/2 refer-

ence.

DIGITAL BUS

The TDA7501 digital interface offers two different

protocols: SPI and I

2C. To select I2C-mode the

SEL-pin has to beconnected to VDD. If the voltage

at the SEL-pin is more than about 1V below the

VDD voltage the interface switches to SPI-mode.

In both cases the interface is able to work with a

3.3V microprocessor as well as with a 5V micro-

processor. For details of both protocols refer to

the programming section.

SPI BUS MODE

Interface protocol

The TDA7501 SPI interface protocol comprises :

- a subaddress and

- a sequence of n databytes

each consisting of 8 bits (see figure 8).

Figure 8. Timing diagram for the SPI bus mode.

CHIP ADDRESS

SUBADDRESS

DATA 1...DATA n

MSB

LSB

MSB

LSB

MSB

LSB

10001100 ACK 00

0 SA3 SA2 SA1 SA0 ACK

DATA

ACK

ACK = Acknowledge

S = Start

P = Stop

2C BUS MODE

Interface Protocol

The interface protocol comprises:

-a start condition (S)

-a chip address byte (write mode only)

-a subaddress byte

-a sequence of data (N-bytes + acknowledge)

-a stop condition (P)

TDA7501

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