AS3689 datasheet(11/72 Pages) AMSOSRAM

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AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

9 - 70

7.1.1 LDO Registers

Table

4 – Register definition for Analog LDO

Reg. Control

Addr: 00

This register enables/disables the LDOs, Charge Pumps, Charge Pump

LEDs, current sinks, the Step Up DC/DC Converter, and low-power mode.

Bit

Bit Name

Default

Access

Description

ldo_ on

R/W

0 = Analog LDO is switched off

1 = Analog LDO is switched on

Table

5 – Register definition for the LDO

Ldo voltage

Addr: 08h

This register sets the output voltage (RGB3) for the LDO.

Bit

Bit Name

Default

Access

Description

4:0

ldo_voltage

00h

R/W

Controls LDO voltage selection.

00000b = 1.85V.

... LSB = 50mV

11111b = 3.4V

ldo_pulld

R/W

Enable a pulldown for LDO ANA (pin RGB3). If RGB3

current sink or the external charge pump is used, leave

this bit at default 0; if the LDO is used in a system, set

this bit always to 1

0 = pulldown is disabled

1 = pulldown is enabled; has only effect if LDO is

off (ldo_ana_on = 0)

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