ACT8937A
Rev 1, 22-Oct-12
REGISTER AND BIT DESCRIPTIONS CONT’D
OUTPUT ADDRESS BIT
NAME
ACCESS
DESCRIPTION
Secondary Output Voltage Selection. Valid when VSEL is
driven high. See the Output Voltage Programming section for
more information.
REG2
REG2
0x31
0x32
[5:0]
[7]
VSET2
R/W
Regulator Enable Bit. Set bit to 1 to enable the regulator, clear
bit to 0 to disable the regulator.
ON
R/W
R/W
Regulator Phase Control. Set bit to 1 for the regulator to
operate 180° out of phase with the oscillator, clear bit to 0 for
the regulator to operate in phase with the oscillator.
REG2
REG2
0x32
0x32
[6]
[5]
PHASE
Regulator Mode Select. Set bit to 1 for fixed-frequency PWM
under all load conditions, clear bit to 0 to transit to power-
savings mode under light-load conditions.
MODE
R/W
Regulator Turn-On Delay Control. See the REG1, REG2,
REG3 Turn-on Delay section for more information.
REG2
REG2
0x32
0x32
[4:2]
[1]
DELAY
R/W
R/W
Regulator Fault Mask Control. Set bit to 1 enable fault-
interrupts, clear bit to 0 to disable fault-interrupts.
nFLTMSK
Regulator Power-OK Status. Value is 1 when output voltage
exceeds the power-OK threshold, value is 0 otherwise.
REG2
REG3
0x32
0x40
[0]
OK
-
R
R
[7:6]
Reserved.
Primary Output Voltage Selection. Valid when VSEL is driven
low. See the Output Voltage Programming section for more
information.
REG3
REG3
REG3
0x40
0x41
0x41
[5:0]
[7:6]
[5:0]
VSET1
-
R/W
R
Reserved.
Secondary Output Voltage Selection. Valid when VSEL is
driven high. See the Output Voltage Programming section for
more information.
VSET2
R/W
Regulator Enable Bit. Set bit to 1 to enable the regulator, clear
bit to 0 to disable the regulator.
REG3
REG3
0x42
0x42
[7]
[6]
ON
-
R/W
R/W
Reserved.
Regulator Mode Select. Set bit to 1 for fixed-frequency PWM
under all load conditions, clear bit to 0 to transit to power-
savings mode under light-load conditions.
REG3
0x42
[5]
MODE
R/W
Regulator Turn-On Delay Control. See the REG1, REG2,
REG3 Turn-on Delay section for more information.
REG3
REG3
0x42
0x42
[4:2]
[1]
DELAY
R/W
R/W
Regulator Fault Mask Control. Set bit to 1 enable fault-
interrupts, clear bit to 0 to disable fault-interrupts.
nFLTMSK
Regulator Power-OK Status. Value is 1 when output voltage
exceeds the power-OK threshold, value is 0 otherwise.
REG3
REG4
REG4
0x42
0x50
0x50
[0]
OK
-
R
R
[7:6]
[5:0]
Reserved.
Output Voltage Selection. See the Output Voltage
Programming section for more information.
VSET
R/W
Regulator Enable Bit. Set bit to 1 to enable the regulator, clear
bit to 0 to disable the regulator.
REG4
REG4
0x51
0x51
[7]
[6]
ON
R/W
R/W
Output Discharge Control. When activated, LDO output is
discharged to GA through 1.5kꢀ resistor when in shutdown.
Set bit to 1 to enable output voltage discharge in shutdown,
clear bit to 0 to disable this function.
DIS
LDO Low-IQ Mode Control. Set bit to 1 for low-power
operating mode, clear bit to 0 for normal mode.
REG4
REG4
REG4
0x51
0x51
0x51
[5]
[4:2]
[1]
LOWIQ
DELAY
R/W
R/W
R/W
Regulator Turn-On Delay Control. See the REG4, REG5,
REG6, REG7 Turn-on Delay section for more information.
Regulator Fault Mask Control. Set bit to 1 enable fault-
interrupts, clear bit to 0 to disable fault-interrupts.
nFLTMSK
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