AS3709 datasheet(32/74 Pages) AMSCO

32 / 74 page

AS3709 – 32

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

Vselect Input

As long as the GPIOx pin is high the DCDC/LDOs operate with

the normal register settings. If the GPIOx pin goes low the

settings will change to the ones stored in regX_voltage.

The gpioX_mode should be set to input.

Figure 42:

GPIO Vselect Modes

IO Functions: Shows the 4 different Vselect modes, depending on the setting of gpioX_iosf

Stand-by and Vselect Input

This mode is very similar to the Vselect mode described in the

previous paragraph. In addition to switch between 2 register

settings of 2 regulators the chip is set into stand-by mode when

the GPIOx pin goes low and wakes up again when the pin is

pulled high.

The gpioX_mode should be set to input.

GPIO1 and GPIO2 may be used to control two regulators

separately.

Figure 43:

Stand-by and Vselect Modes

IO Functions: Shows the 4 different Vselect and Stand-by control modes, depending on the setting of gpioX_iosf

gpio1_iosf

gpio2_iosf

Vselect mode

<> 5

No voltage select by GPIO for regulator

<> 5

GPIO2 controls regulator selected by reg1_select and reg2_select

<> 5

GPIO1 controls regulator selected by reg1_select and reg2_select

GPIO1 controls regulator selected by reg1_select

GPIO2 controls regulator selected by reg2_select

gpio1_iosf

gpio2_iosf

Vselect Mode

Stand-by Control

<> 6

no voltage select by GPIO for regulator

<> 6

GPIO2 controls regulator selected by reg1_select

and reg2_select

Yes

6<> 6

GPIO1 controls regulator selected by reg1_select

and reg2_select

Yes

GPIO1 controls regulator selected by reg1_select

GPIO2 controls regulator selected by reg2_select

Yes

AS3709 Datasheet(PDF) 32 Page - ams AG

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