AS3722 datasheet(67/199 Pages) AMSOSRAM

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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- System Functions

PWM Input

With this input the PWM signal of the internal PWM generator

can be over-ruled. This input is then used to drive the PWM

output function of a GPIO if selected. The gpioX_mode should

be set to input.

Voltage_sdtby + Restart Input

As long as the GPIOx pin is high the DCDC/LDOs operate with

the normal register settings. If the GPIOx pin goes low the

settings will change to the ones stored in regX_voltage_stby. In

addition the chip is set into stand-by mode. regX_select_stby

defines the order of the regulators for going into stand_by. All

other regulators not defined in sdX_stby_on or ldoX_stdby_on

will be put into stand_by simultaneously at the end of the

sequence.

Pulling GPIOx pin high will wake-up the chip. The sequence is

reversed to going into stand_by.

Delays for the sequence can be set with regX_stby_delay and

delay_time_stby.

The gpioX_mode should be set to input.

OC_PG_SD0 Output

Please see section OC_PG pin function description in chapter

OC_PG (Output Pins) for a detailed description.

PWRGOOD Output

This signal will go high at the end of the start-up sequence. This

can be used as a second reset signal to the processor to e.g.

start oscillators. The gpioX_mode should be set to output.

Q32k Output

When selected the GPIOx will provide the 32kHz RTC crystal

frequency. If the oscillator is not enabled or not assembled an

internal RC oscillator based clock will be used for the output.

The gpioX_mode should be set to output.

Watchdog Input

When pulling the GPIO high the watchdog will be triggered to

avoid a reset cycle initiated by the watchdog. The gpioX_mode

should be set to input.

Soft-Reset Input

This will perform a start-up sequence to reset all voltage

registers. The gpioX_mode should be set to input.

PWM Output

The GPIO block includes an internal programmable PWM

generator (can be connected to any of the GPIO outputs). Its

timing is defined by pwm_h_time, pwm_l_time and pwm_div.

The gpioX_mode should be set to output.

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