SABRE-LL-I datasheet(93/141 Pages) STMICROELECTRONICS

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SABRE-LL-I

GPIO pins

93/141

GPIO pins

22.1

Overview

Some of the pins of S.A.B.Re are indicated as GPIO (General Purpose I/O). These pins can

be configured to be used in different ways depending on customer application. All GPIOs

can be used as digital input/output pins with digital value settable/readable using serial

interface or as analog input pins that can be converted using the A2D system. Some of the

pins can be used for special purposes: i.e. two of them can be used to access to the pass

switch function, other two are used as feedback pins for the auxiliary synchronous switching

regulators.

All input Schmitt triggers and output circuitry used for start-up purposes are powered by the

internally generated V3v3, while the digital output buffers are powered by VGPIO_SPI pin. To

ensure independency between V3v3 and VGPIO_SPI the GPIOs output drivers are open-drain

driver or the high side MOS is in back-to-back configuration to avoid the presence of the

body diode between output and supply (all back-to-back drivers can be customized to

become open-drain drivers with a metal change).

All digital output signals can be inverted before being provided on the relative GPIO pins.

Here below is reported the table with GPIO functions:

Table 67.

GPIO functions description

Name

Function(1)

Notes

Input

Output

Special

Analog

Digital

Analog

Digital

GPIO[0]

- ADC input

- SPI IN

- SPI OUT

- Interrupt ctrl.

- AuxPwm1

- AuxPwm2

Start-up

configuration

Open drain

output

GPIO[1]

- ADC input

- Comp1 In-

- Vaux1 F.B.

- SPI IN

- SPI OUT

- Interrupt ctrl.

- AuxPwm1

- AuxPwm2

Open drain

output

GPIO[2]

- ADC input

- Comp2 In-

- Vaux2 F.B.

- SPI IN

- IN PWM

- SPI OUT

- Interrupt ctrl.

- AuxPwm2

- AuxPwm3

Open drain

output

GPIO[3]

- ADC input

- SPI IN

- SPI OUT

- AuxPwm2

- AuxGpPwm3

Start-up

configuration

Open drain

output

GPIO[4]

- ADC input

- SPI IN

- SPI OUT

- Interrupt ctrl.

- AuxPwm1

- AuxPwm3

Start-up

configuration

Open drain

output

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