AS3715 datasheet(64/159 Pages) AMSOSRAM

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Page 63

[v1-03] 2015-Aug-10

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AS3715 − Detailed Description – System Functions

Stand-By

Description

Stand-By allows shutting down a part or the complete system.

Stand-By can be terminated by every possible interrupt or GPIO

of the PMU. The interrupt has to be enabled and GPIO has to be

configured before going to stand-by.

Figure 65:

Stand-By

Stand-By: Shows different options to enter and leave the stand-by state.

State

Description

Enter via GPIO

To enter stand-by mode the following settings have to be done:

• Enable just these IRQ sources which should lead to leave stand-by mode.

• Make sure that IRQ is inactive (IRQ flags get cleared by register reading)

• Set the GPIO to input (gpioX_mode = 0)

• Set the GPIO for stand-by control (gpioX_iosf = 6)

• Set regX_select and regX_voltage if another voltage is needed during stand-by for up to 3

regulators

• Define which regulators should be kept powered during stand-by (sdX_stby_on and

ldoX_stby_on)

• Activate the selected GPIO (set to HIGH)

Enter via SW

To enter stand-by mode the following settings have to be done:

• Enable just these IRQ sources which should lead to leave stand-by mode.

• Make sure that IRQ is inactive (IRQ flags get cleared by register reading)

• Set regX_select_stby and regX_voltage_stby if another voltage is needing during stand-by

for up to 7 regulators

• Define which regulators should be kept powered during stand-by (sdX_stby_on and

ldoX_stby_on)

• Set the delay for going into stand-by after the SW command (off_delay)

• set standby_mode to 1

Stand-By

V2_5 chip supply is kept ON

All other regulators are switched OFF dependent on the bits sdX_stby_on and ldoX_stby_on

XRES_OUT goes active (can be disabled with standby_reset_disable in the boot OTP) and

pwr_good goes inactive

Leave

The chip will come out of stand-by with

• IRQ activation (use the GPIO restart interrupt (gpio_restart_int) to leave with the same

GPIO you entered stand-by)

• ONKEY/ENx = High

Start-Up sequence is provided defined by the boot OTP

AS3715 Datasheet(PDF) 64 Page - ams-OSRAM AG

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