AS3608 datasheet(30/68 Pages) AMSCO

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AS3608 2v2

Data Sheet - D e t a i l e d D e s c r i p t i o n - S Y S T E M F u n c t i o n s

9.6 GPIO Pins

AS3608 features 4 GPIO pins.

If not re-configured in the start-up sequence GPIO1, GPIO3 and GPIO4 are input per default.GPIO2 is set to output and the pin is driven to low

right at the beginning of the startup sequence. GPIO1 and GPIO2 have a dedicated bit to switch the direction between input and output. GPIO3/

4 have one state defined as input and three states as output. The following table shows the different input/output options.

When configured as input the following functionality is available:

ADC input, to measure external voltage sources

Wake-up input to return from hibernation

Hibernation enable input (GPIO1/2/3 only)

PWM dimming input (GPIO1/2/3 only)

GPIO pins have a 200kOhm pull-down resistor activated when they are used as an input. (HiZ-mode).

Please note that all GPIO pins are open-drain outputs. They can only output a logic “high” if a pull-up and the corresponding pull-up voltage is

present.

Table 14. GPIO Configuration

GPIO1

GPIO2

GPIO4/3

xCharging (1Hz pulses)

LOW

HiZ / HiZ (input)

xVSUP_low

xVSUP_low / xCharging (1Hz pulses)

xPWRUP

HIGH

xPWRUP / PWRGOOD

PWRGOOD

xCharging (1Hz pulses)

xEOC / xCharger_active

Table 15. GPIO Output Functions

Function

Description

xCharging (1Hz pulses)

The output will be high when the charger is no active. The output toggles between high and low as

long as the charging is on going. If EOC, a timeout or overtempertur event stops the charger the

output stops toggling.

xCharger_active

The output will be high when the charger is no active or in EOC; it will be low if the charger is active.

xEOC

The output will be high when the charger active; it will be low if the charger is has reached EOC.

The output will return back to high if the charger enters resume state.

xPWRUP

The output will get low if the PWRUP pin is high.

PWRGOOD

The output will be high about 3ms after the start-up sequence is finished. It will be low during the

sequence. Please be sure to configure the GPIO before the pull-up voltage, otherwise the output

will be high as long as the GPIOs are default inputs.

xVSUP_low

The output will get low if the VSUP undervoltage level is reached.

HIGH

The output will be high.

LOW

The output will be low.

AS3608 Datasheet(PDF) 30 Page - ams AG

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