White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Table 14. LDO2_CNTL (Address 0x0C)
Table 15. AUDIO_CNTL (Address 0x0D)
BIT
NAME
CODE
DESCRIPTION
BIT
NAME
CODE
DESCRIPTION
B7, B6
N/A, do not use.
Audio amplifier and
B5
LDO2_EN
0
1
LDO2 is disabled.
LDO2 is enabled.
0
charge-pump
clocks are not
synchronized.
B4
LDO2_PD
0
Active pulldown enabled
during OFF condition.
B7
SYNC
Audio amplifier and
charge-pump clocks
1
0000
0001
0010
0011
0100
Active pulldown disabled
during OFF condition.
1.5V
1.6V
1.8V
2.0V
2.2V
1
00
are synchronized.
Charge pump
oscillator clock =
audio clock / 2.
Oscillator frequency
1100kHz, fixed-
frequency mode.
Oscillator frequency
0101
0110
2.3V
2.4V
B6, B5
CLK_CNTL[1:0]
01
1400kHz, fixed-
frequency mode.
Oscillator frequency
B3–B0
LDO2[3:0]
0111
1000
2.5V
2.6V
10
1250kHz, spread-
spectrum mode.
1001
1010
1011
1100
2.7V
2.8V
2.9V
3.0V
B4
AMP_EN
11
0
1
Reserved for future
use.
Class D amplifier is
disabled.
Class D amplifier is
1101
3.1V
enabled.
1110
1111
Note: Defaults in bold italics.
3.2V
3.3V
0000
0001
0010
0011
0100
0101
0110
-3dB
0dB
3dB
6dB
9dB
12dB
15dB
B3–B0
AUDIO_GAIN[3:0]
0111
1000
1001
1010
1011
1100
1101
1110
1111
18dB
21dB
24dB
N/A, do not use.
N/A, do not use.
N/A, do not use.
N/A, do not use.
N/A, do not use.
N/A, do not use.
Note: Defaults in bold italics.
26
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