AS3715 datasheet(68/160 Pages) AMSCO

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Page 68

ams Datasheet, Confidential

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[v1-00] 2014-Sep-10

AS3715 − Detailed Description – System Functions

Figure 70:

GPIO Stand-by and Vselect Modes

Stand-by and Vselect Mode: Shows the different GPIO voltage and stand-by control modes for regulators.

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 internal 32kHz

oscillator frequency. 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.

SU1 OC Output

This output signal can be used to control an external disconnect

transistor if SU1 detects an over current condition. The

gpioX_mode should be set to output.

Charger Active Output

When selected, the GPIOx will go high if the charger is active.

The gpioX_mode should be set to output.

EOC Output

When selected, the GPIOx will go high if the charger has reached

the EOC state. The gpioX_mode should be set to output.

100/900mA Charger Input

With this function the charger input current limiter can be set

to 100 or 900mA (low power or high power USB limit). The

gpioX_mode should be set to input.

gpio1_iosf

gpio2_iosf

Vselect mode

Stand-by control

≠ 6

No voltage select by GPIO for regulator

≠ 6

GPIO2 controls regulator selected by reg1_select,

reg2_select and reg3_select

Yes

6≠ 6

GPIO1 controls regulator selected by reg1_select,

reg2_select and reg3_select

Yes

GPIO1 controls regulator selected by reg1_select

GPIO2 controls regulator selected by reg2_select

& reg3_select

Yes

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