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SC668
Register Map (continued)
LDO3 Control Register (0Ch)
This register is used to enable LDO3 and set its output
voltage level.
Bits [D5:D4]
These bits are unused and are always zeroes.
LDO3V3 through LDO3V0 [D3:D0]
These bits are used to set the output voltage of LDO3 as
shown in Table 12.
Table 12 — LDO3 Control Codes
LDO4 Control Register (0Dh)
This register is used to enable LDO4, set its output voltage
level, and provide power for the internal ADC. The ADC
will not function without first turning on LDO4.
The output of LDO4 is used internally to provide the full-
scale reference voltage for the ADC. When the ADC is
active, LDO4 also provides a convenient source of power
for devices such as ambient light sensors, and tempera-
ture sensors.
Bits [D5:D4]
LDO3V3
0
0
0
0
0
LDO3V2
0
0
0
0
1
LDO3V1
0
0
1
1
0
LDO3V0
0
1
0
1
0
V LDO3
OFF
3.3V
3.2V
3.1V
3.0V
These bits are unused and are always zeroes.
LDO4V3 through LDO4V0 [D3:D0]
These bits are used to set the output voltage of LDO4 as
shown in Table 13.
Table 13 — LDO4 Control Codes
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
2.9V
2.8V
2.7V
2.6V
2.5V
2.4V
2.2v
1.8V
1.7V
1.6V
1.5V
LDO4V3
0
0
0
0
0
0
0
0
1
1
LDO4V2
0
0
0
0
1
1
1
1
0
0
LDO4V1
0
0
1
1
0
0
1
1
0
0
LDO4V0
0
1
0
1
0
1
0
1
0
1
V LDO4
OFF
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.6V
2.5V
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
2.4V
2.2V
1.8V
1.7V
1.6V
1.5V
37
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