wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 129

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
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The default output voltage for DC-DC Converters 1, 3 and 4 is set by writing to the DCn_VSEL
register bits. The ‘image’ voltage settings DCn_VIMG are alternate values that may be invoked when
the HIBERNATE software or hardware control is asserted as described above.
The DC-DC Converters 1, 3 and 4 are dynamically programmable - the output voltage may be
adjusted in software at any time. These Converters are buck (step-down) converters; their output
voltage can therefore be lower than the input voltage, but cannot be higher.
R180 (B4h) for
DC-DC1
R186 (BAh) for
DC-DC3
R189 (BDh) for
DC-DC4
R182 (B6h) for
DC-DC1
R188 (BCh) for
DC-DC3
R191 (BFh) for
DC-DC4
Note: n is either 1, 3 or 4 and identifies the individual DC-DC converter
Table 73 Output Voltage Control for DC-DC Converters 1, 3 and 4
When the DC-DC Converters 1, 3 and 4 are disabled, the output can be set to float or else the
outputs can be actively discharged through internal resistors. This feature is controlled using the
register bits described in Table 74.
R180 (B4h) for
DC-DC1
R186 (BAh) for
DC-DC3
R189 (BDh) for
DC-DC4
Note: n is either 1, 3 or 4 and identifies the individual DC-DC converter
Table 74 Output Float Control for DC-DC Converters 1, 3 and 4
ADDRESS
ADDRESS
BIT
6:0
6:0
10
BIT
DCn_VSEL
[6:0]
DCn_VIMG
[6:0]
DCn_OPFLT
LABEL
LABEL
Dependant on
CONFIG[1:0]
000 0110
DEFAULT
DEFAULT
settings
0
Enable discharge of DC-DCn outputs
when DC-DCn is disabled
0 = Enabled - Output to be discharged
1 = Disabled - Output is left floating
DC-DCn Converter output voltage
settings in 25mV steps.
Maximum output = 3.4V.
110 0110 = 3.4V
110 0010 = 3.3V
101 0110 = 3.0V
100 1110 = 2.8V
……
010 0110 = 1.8V
000 1110 = 1.2V
000 0110 = 1.0V
000 0000 = 0.85V
DC-DCn Converter output image voltage
settings in 25mv steps.
Maximum output = 3.4V.
110 0110 = 3.4V
110 0010 = 3.3V
101 0110 = 3.0V
100 1110 = 2.8V
……
010 0110 = 1.8V
000 1110 = 1.2V
000 0110 = 1.0V
000 0000 = 0.85V
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
WM8351
129