AS3722 datasheet(68/199 Pages) AMSOSRAM

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ams Datasheet

Page 67

[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Vsup_vbat_low Output (de-bounced)

GPIOx pin will go high if VSUP falls below vsup_min or VBAT falls

below ResVoltFall and SupResEn = 0. The gpioX_mode should be

set to output.

OC_PG_SD6 Output

GPIOx pin will go high if DCDC6 is disabled. GPIOx pin will be

low during start-up of DCDC6.

After start-up of DCDC6 the GPIOx pin will be high as long

DCDC6 is not in a low voltage or overcurrent operation. The

inputs may be masked with pg_powergood_sd6_mask and

pg_ovcurr_sd6_mask. There is no 90us black-out time like for

DCDC0. The gpioX_mode should be set to output.

ADC_reference Output

By setting adc_buf_on the buffered 1.6V ADC reference is

available on GPIO7. The gpio7_mode should be set to “3”

(tristate) gpio7_iosf should be set to “0” (normal).

Dedicated IO Pins

Input Pins

ENABLE1/CORE_PWRREQ

As long as the ENABLE1 pin is high the DCDC/LDOs operate with

the normal register settings. If the ENABLE1 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 ENABLE1 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.

ENABLE1 pin is default disabled after start-up from off state.

enable1_stby_en and enable1_inv will enable the input and set

the polarity.

ENABLE2/CPU_PWRREQ

ENABLE2 is a dedicated pin to on/off control of SD0.

enable2_enable and enable2_inv will enable the input and set

the polarity.

THERM

Is an external signal which triggers an immediate power down

similar to VSUP_low or a chip over-temperature event. The chip

will not power-on again before the THERM signal is de-asserted.

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