AS3701 datasheet(47/110 Pages) AMSOSRAM

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[v1-11] 2016-Dec-14

AS3701 − Detailed Description – System Functions

GPIO Pins

AS3701A contains 2 GPIO pins and AS3701B offers 5 GPIO pins.

Each of the pins can be configured as digital input, digital input

(with pull-up or pull-down), push-pull output or open drain

output (with or without pull-up). When configured as output

the output source can be a register bit, or the PWM generator.

Additional the GPIO1 and GPIO2 can be configured as a Current

sink and the GPIO3 and GPIO4 (only available in AS3701B) can

offer an input to connect a NTC for supervising the battery

temperature.

The polarity of the input and output signals can be inverted

with the corresponding gpioX_invert [GPIOXcontrol] bit, all

further descriptions refer to normal (non-inverted) mode.

Figure 54:

GPIO Block Diagram

GPIO Block Diagram: Shows the internal structure of the IO pads

gpioX_out: 0

VSUP_low output: 2

Pwr_good output: 7

Interrupt output: 1

Charger active output: 10

EOC output: 11

PWM output: 14

gpioX_in: 0

Current sink PWM input: 4

vselect input: 5

Stand-by + vselect input: 6

GPIO Interrupt input: 3

Charger Current Range1: 8

Charger Current Range2: 9

100/500mA USB current limit: 12

900/1400mA USB current limit: 13

gpioX_invert

gpioX_iosf

gpioX_mode = 1, 2 or 6

gpioX_mode = 1

gpioX_mode = 0, 2, 4, 5 or 6

gpioX_mode = 4 or 6

gpioX_mode = 5

300k

VSUP

GPIOx

CURR1/2

Charger enable input: 15

gpio3/4_mode = 3 (NTC)

gpio1/2_mode = 7

gpioX_invert

gpioX_iosf

curr1/2_current

gpioX_out: 0

VSUP_low output: 2

Pwr_good output: 7

Interrupt output: 1

Charger active output: 10

EOC output: 11

PWM output: 14

gpio1/2_mode = 7

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