AS3722 datasheet(66/199 Pages) AMSOSRAM

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ams Datasheet

Page 65

[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Figure 64:

GPIO Block Diagram

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

IO Functions

Normal IO Operation

If set to input, the logic level of the signal present at the GPIOx

pin can be read from gpioX_in. If the output mode is chosen,

gpioX_out specifies the logic level of the GPIOx pin.

This mode is also used for the on/off control of the DCDC and

LDOs. The selection which regulator is controlled by which

GPIO, is done with the gpio_ctrl_sdX or gpio_ctrl_ldoX bits. The

gpioX_mode should be set to input.

Interrupt Output

GPIOx pin logic state is derived from the interrupt signal INT.

Whenever an interrupt is present, the GPIOx pin is pulled high.

The gpioX_mode should be set to output.

VSUP_VBAT_Low Output (not 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.

GPIO Interrupt Input

A falling or rising edge will set the gpio_int bit. The gpioX_mode

should be set to input.

VSUP_GPIO

gpioX_out: 0

Interrupt output: 1

VSUP_VBAT_low output: 2

GPIO interrupt input: 3

PWM input: 4

vselect_stdby input: 5

OC_PG_SD0: 6

pwr_good output: 7

Q32k output: 8

watchdog input: 9

PWM output: 12

VSUP_VBAT_low (debounced): 13

n/a: 10

Soft reset input: 11

OC_PG_SD6 low output: 14

n/a: 15

gpioX_iosf

gpioX_invert

gpioX_iosf

gpioX_in: 0

gpioX_mode = 0,2,4,5 or 6

gpioX_mode = 1 or 7

gpioX_mode = 1, 2 or 6

GPIOx

gpioX_mode = 4 or 6

gpioX_mode = 5

300k

VDD_GPIO_lv

gpioX_mode = 1

gpioX_mode = 4, 6 or 7

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