TDA7529 datasheet(16/60 Pages) STMICROELECTRONICS

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Function description

TDA7529

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3.10

GPIO - general purpose IO interface pins

The front-end has seven GPIO - general purpose control pins to switch external stages

(output), e.g amplifiers, or to read the status of external stages (input), e.g. control voltages.

Some control pins are multiplexed with other functions that are not necessary in every tuner

design (FM AGC keying, AM cascode control). All the GPIOs may put in tristate or in enable

mode. When in enable the GPIOs can be configured as shown in the following table.

All GPIOs are short-circuit protected by current limiter and voltage-tolerant up to 3.5V.

Table 5.

GPIO - general purpose IO interface pins

GPIO ports

FUNCTION

GPIO1

selects function of GPIO1: if input, connects

GPIO1 to ADC (ADC must then be configured

to use GPIO1 as input); if output, level depends

on GPIO Out Lev Ctrl

→ GPIO1

- AnlgIn to AD

- DigOut

GPIO2

selects function of GPIO2: if input, connects

GPIO2 to ADC (ADC must then be configured

to use GPIO2 as input) and to KAGC (FM

KAGC must then be enabled); if output, level

depends on GPIO Out Lev Ctr

→ GPIO2

- AnlgIn to AD – Kagc In

- DigOut

GPIO4

selects function of GPIO4: if input, configures

GPIO4 as AM Cascode VDS input; if output,

level depends on GPIO Out Lev Ctrl

→ GPIO4

- AnlgIn

- DigOut

GPIO5

selects function of GPIO5: if input, it is directly

connected to read-only register byte 48 bit 4; if

output, level depends on GPIO Out Lev Ctrl

→

GPIO5.

When set to input, it is necessary to set IF AMP

→ GPIO5 out mode to “ON GPIO5 out En”

(labels are wrong).

Also used for production testing as analog

output (not relevant for application).

- DigIn

- Out (Dig or Anlg)

GPIO6

selects function of GPIO6 if device is

configured in I2C mode: if input, it is directly

connected to read-only register byte 48 bit 5; if

output, level depends on GPIO Out Lev Ctrl

→

GPIO5.

When the device is configured in SPI mode,

program GPIO Out Lev Ctr

→ GPIO5 to “Low”.

The value of GPIO mode

→ GPIO5 does not

matter

- Din (spi MISO out)

- Dout (spi MISO out)

GPIO7

selects function of GPIO7: if digital output is

selected, level depends on GPIO Out Lev Ctrl

→ GPIO7; otherwise, configures GPIO7 as FM

AGC Vout

- Digital Out

- FM agc Vout

GPIO8

selects function of GPIO8: if output, level

depends on GPIO Out Lev Ctrl

→ GPIO8;

otherwise, configures GPIO8 as AM AGC Vout

- Digital Out

- AM agc Vout

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