wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 140

• Manufacturer Part Number: wm8400
• Description: Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
• Manufacturer: Wolfson Microelectronics plc

WM8400
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DC-DC CONVERTER / LDO REGULATOR VOLTAGE SELECT
The output voltage of the DC-DC Converters and LDO Regulators may be set in hardware or using
software control. If software control is used, the output voltages may be set using the register fields
detailed in Table 86. The output voltages may be set dynamically, without needing to disable or reset
any part of the WM8400. Note that the output voltages in Hibernate Mode are separately configured
(see Table 91).
In the case of the DC-DC Converters, note that the performance figures in the Electrical
Characteristics are valid for output voltages of up to 3.4v only.
Table 86 DC-DC Converter and LDO Regulator Voltage Setting (Software)
R65 (41h)
R66 (42h)
R67 (43h)
R68 (44h)
R70 (46h)
R72 (48h)
REGISTER
ADDRESS
BIT
4:0
4:0
4:0
4:0
6:0
6:0
LDO1_VSEL
[4:0]
LDO2_VSEL
[4:0]
LDO3_VSEL
[4:0]
LDO4_VSEL
[4:0]
DC1_VSEL
[6:0]
DC2_VSEL
[6:0]
LABEL
DEFAULT
0000000b
0000000b
00000b
00000b
00000b
00000b
LDO1 voltage select
0.9v to 1.6v in 0.05v steps,
1.7 to 3.3v in 0.10v steps
See Table 87 for details
LDO2 voltage select
0.9v to 1.6v in 0.05v steps,
1.7 to 3.3v in 0.10v steps
See Table 87 for details
LDO3 voltage select
0.9v to 1.6v in 0.05v steps,
1.7 to 3.3v in 0.10v steps
See Table 87 for details
LDO4 voltage select
0.9v to 1.6v in 0.05v steps,
1.7 to 3.3v in 0.10v steps
See Table 87 for details
DC1 voltage select
0.85v to 4.025v in 0.025v steps
See Table 88 for details
DC2 voltage select
0.85v to 4.025v in 0.025v steps
See Table 88 for details
DESCRIPTION
PP, April 2009, Rev 3.0
Pre-Production
140