AS3709 datasheet(29/74 Pages) AMSCO

29 / 74 page

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

AS3709 – 29

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

Stand-by

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 38:

Stand-by

Internal References

Low Power Mode

Use bit low_power_on to activate the Low Power Mode. In this

mode the on-chip voltage reference and the temperature

supervision comparators are operating in pulsed mode. This

reduces the quiescent current of the AS3709 by 45μA (typ.).

Because of the pulsed function some specifications are not

fulfilled in this mode (e.g. increased noise), but still the full

functionality is available.

Note(s): Low power mode can be controlled by the serial

interface.

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 to define the sequence for going into stand-by for up to 3 regulators

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

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

ldoX_stby_on)

• Activate the selected GPIO

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)

• 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_on 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 goes active (can be disabled with standby_reset_disable) and pwr_good goes inactive

Leave

The chip will come out of stand-by with

• IRQ activation or

• GPIO control (if entered via GPIO)

Start-Up sequence is provided defined by the boot ROM.

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