AS3715 datasheet(68/159 Pages) AMSOSRAM

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Page 67

[v1-03] 2015-Aug-10

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AS3715 − Detailed Description – System Functions

Current Sink PWM Input

The GPIO is used as PMW input for the current sink to control

the current. 100% PWM mode will set the current to the value

set by currX_current. The PWM control has to be enabled by

currX_ctrl =11b for each current sink to be controlled. The

gpioX_mode should be set to input.

Vselect Input

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

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

settings will change to the ones stored in regX_voltage.

The gpioX_mode should be set to input.

The regulator affected by this mode is selected by regX_select.

While GPIO3 to GPIO6 always control all regulators selected by

regX_select, GPIO1 and GPIO2 may be used to control two

regulators separately:

Figure 70:

GPIO Vselect Modes

GPIO Vselect Mode: Shows the different GPIO voltage control modes for regulators.

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 3 regulators, the chip is set to stand-by mode when

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

pulled low.

The gpioX_mode should be set to input.

Only one GPIO is needed to control the stand-by function and

voltage setting of all 3 selectable regulators. It’s not

recommended to set this mode (gpioX_iosf=6) for more than

one GPIO at the same time. It’s not possible to control the

regulators by different GPIOs.

PWRGOOD Output

This signal will go high at the end of the start-up sequence. This

can be used as a second reset signal to the processor to e.g.

start oscillators. The gpioX_mode should be set to output.

gpio1_iosf

gpio2_iosf

Vselect Mode

≠ 5

No voltage select by GPIO for regulator

≠ 5

GPIO2 controls regulator selected by reg1_select, reg2_select and

reg3_select

5≠ 5

GPIO1 controls regulator selected by reg1_select, reg2_select and

reg3_select

GPIO1 controls regulator selected by reg1_select

GPIO2 controls regulator selected by reg2_select & reg3_select

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