AS3709 datasheet(31/74 Pages) AMSCO

31 / 74 page

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

AS3709 – 31

Detaile d Desc rip t ion - S y st em Fu nc tions

Figure 41:

GPIO Pin Characteristics

GPIO Pins: Shows the key electrical parameter of the GPIO pins. VSUP=2.7 to 5.5V; unless otherwise mentioned.

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 XINT.

Whenever an interrupt is present the GPIOx pin will be pulled

high.

The gpioX_mode should be set to output.

VSUP_low Output

GPIOx pin will go high if VSUP 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.

Symbol

Parameter

Note

Min

Typ

Max

Unit

VGPIO_max

Max. voltage on GPIO1/2

pins

Pin VSUP is used as supply for

the GPIO pins

VSUP +

0.3

VOL

Low level output voltage

IOL=+1mA

digital output

+0.4

VOH

High level output voltage

IOH=–1mA; digital push-pull

output

0.8*VSUP

VIL

Low level input voltage

Digital input

0.4

VIH

High level input voltage

Digital input

1.4

ILEAKAGE

Leakage current

High impedance

μA

Rpull-up

Pull-up resistance

if enabled; VSUP = 3.6V

300

kΩ

Rpull-down

Pull-down resistance

if enabled; VSUP = 3.6V

300

kΩ

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