ACT5880
Rev 2, 03-Sep-13
REGISTER AND BIT DESCRIPTIONS CONT’D
DE-
ADDRESS
and BIT
FAULT
and
BLOCK
NAME
DESCRIPTION
ACCESS
7
6
5
x
x
0
0
1
0
0
1
0
0
W/R
W/R
W/R
W/R
W/R
For internal use only.
VSET[5]
VSET[4]
VSET[3]
VSET[2]
VSET[1]
VSET[0]
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
4
0x20
3
2
1
0
W/R DC/DC AND LDO OUTPUT VOLTAGE SETTING table for details.
W/R
W/R
Regulator On/Off Bit. Set bit to 1 to turn on the regulator, set bit to 0
to turn off the regulator.
7
ON
1
W/R
Regulator Phase Control. Set bit to 1 for the regulator to operate
W/R 180° out of phase with the oscillator, set bit to 0 for the regulator to
operate in phase with the oscillator.
6
PHASE
1
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.
5
MODE
0
W/R
0x22
4
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[2]
DELAY[1]
DELAY[0]
0
0
0
W/R
W/R
W/R
3
2
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.
1
nFLTMSK
OK
0
W/R
REG2
Regulator Power-OK Status. Value is 0 when the output is out of
regulation, value is 1 when the output is in regulation.
0
R
R
7
6
5
x
x
0
0
1
0
0
1
0
0
1
0
W/R
W/R
W/R
W/R
W/R
W/R details.
W/R
W/R
For internal use only.
VSET[5]
VSET[4]
VSET[3]
VSET[2]
VSET[1]
VSET[0]
x
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
4
0x28
3
2
1
0
7
6
WE/R
WE/R
Not used.
x
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.
5
LOWIQ
1
W/R
4
x
x
x
0
0
0
x
x
x
Not used.
Not used.
Not used.
3
0x29
2
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.
1
nFLTMSK
OK
0
0
W/R
R
Regulator Power-OK Status. Value is 0 when the output is out of
regulation, value is 1 when the output is in regulation.
0
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