AS3722 datasheet(60/199 Pages) AMSOSRAM

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Page 59

[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Figure 57:

Stand-By

State

Description

Enter via

ENABLE1

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)

• Enable ENABLE1 (enable1_deepsleep=1)

• Set regX_select_stby to define the sequence for going into stand-by for up to 10

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)

• Define the delay between the regulators when going into stand-by (regX_delay_stdby

and delay_time_stby)

• Activate ENABLE1 (pull LOW)

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 = 5)

• Set regX_select_stby to define the sequence for going into stand-by for up to 10

regulators

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

• Define the regulators to be controlled by a specific GPIO (gpio_ctrl_sdX and

gpio_ctrl_ldoX)

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

ldoX_stby_on)

• Define the delay between the regulators when going into stand-by (regX_delay_stdby

and delay_time_stby)

• Set the delay for going into stand-by after GPIO activation (off_delay)

• 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 10 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_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_OUT goes active (can be disabled with stdby_reset_disable) and pwr_good goes

inactive

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