ACT5880 datasheet(21/87 Pages) ACTIVE-SEMI

21 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 21 -

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BLOCK

ADDRESS

and BIT

NAME

DE-

FAULT

and

ACCESS

DESCRIPTION

REG2

0x20

W/R

For internal use only.

W/R

VSET[5]

W/R

Voltage Setting for the buck regulation part of the REG2, which is

active in normal mode (Refer to byte 0x28 for REG2 output voltage

in sleep mode). Default setting is 1.8V. Refer to the STEP-DOWN

DC/DC AND LDO OUTPUT VOLTAGE SETTING

table for details.

VSET[4]

W/R

VSET[3]

W/R

VSET[2]

W/R

VSET[1]

W/R

VSET[0]

W/R

0x22

W/R

Regulator On/Off Bit. Set bit to 1 to turn on the regulator, set bit to 0

to turn off the regulator.

PHASE

W/R

Regulator Phase Control. Set bit to 1 for the regulator to operate

180° out of phase with the oscillator, set bit to 0 for the regulator to

operate in phase with the oscillator.

MODE

W/R

Regulator Mode Select. Set bit to 1 for fixed-frequency PWM mode

under all load conditions, set bit to 0 to allow PFM mode under light

-load conditions.

DELAY[2]

W/R

Regulator Turn-On Delay Control. DELAY[2:0]=000 for no delay.

Other code to delay relationship: 001 for 2ms, 010 for 4ms, 011 for

8ms, 100 for 16ms, 101 for 32ms, 110 for 64ms and 111 for 128ms.

There is a propagation delay for about 100μs if selecting no delay.

DELAY[1]

W/R

DELAY[0]

W/R

nFLTMSK

W/R

Regulator Fault Interrupt Mask. Set bit to 1 to enable fault-interrupt

when the output is out of regulation, set bit to 0 to disable fault-

interrupt.

Regulator Power-OK Status. Value is 0 when the output is out of

regulation, value is 1 when the output is in regulation.

0x28

W/R

For internal use only.

W/R

VSET[5]

W/R

Voltage Setting for the linear regulation part of the REG2, which is

active in sleep mode. Default setting is 1.8V. Refer to the STEP-

DOWN DC/DC AND LDO OUTPUT VOLTAGE SETTING

table for

details.

VSET[4]

W/R

VSET[3]

W/R

VSET[2]

W/R

VSET[1]

W/R

VSET[0]

W/R

0x29

1 WE/R

0 WE/R

LOWIQ

W/R

LDO Low-IQ Mode Control. Set bit to 1 for low quiescent current

mode, set bit to 0 for normal mode. If it is set to 1, the backup bat-

tery charger stops in the deep sleep mode.

Not used.

nFLTMSK

W/R

Regulator Fault Interrupt Mask. Set bit to 1 to enable fault-interrupt

when the output is out of regulation, set bit to 0 to disable fault-

interrupt.

Regulator Power-OK Status. Value is 0 when the output is out of

regulation, value is 1 when the output is in regulation.

Not used.

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