AS3709 datasheet(30/74 Pages) AMSCO

30 / 74 page

AS3709 – 30

ams Datasheet, Confidential: 2013-Aug [1-02]

Det a il e d De sc r i pt ion - S y s t em F u nc t i on s

Figure 39:

Reference Parameter

GPIO Pins

The device contains 2 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.

The polarity of the input and output signals can be inverted

with the corresponding gpioX_invert bit, all further descriptions

refer to normal (non-inverted) mode.

Figure 40:

GPIO Block Diagram

GPIO block diagram: Shows the internal structure of the IO pads

Symbol

Parameter

Note

Min

Typ

Max

Unit

fCLK

Accuracy of Internal

reference clock

Adjustable by serial interface

-12

fCLK

+12

gpioX_out: 0

VSUP_low output: 2

Pwr_good output: 7

Q32k output: 8

Interrupt output: 1

n/a: 10

n/a: 11

n/a: 13

gpioX_in: 0

n/a: 4

vselect input: 5

Stand-by + vselect input: 6

GPIO Interrupt input: 3

n/a: 7

n/a: 12

n/a: 13

n/a: 15

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

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