Production Data
WM8352
The default output voltage for DC-DC Converters 1, 3, 4 and 6 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, 4 and 6 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.
ADDRESS
R180 (B4h) for
DC-DC1
BIT
LABEL
DEFAULT
DESCRIPTION
6:0
DCn_VSEL
[6:0]
Dependant
on CONFIG settings in 25mV steps.
settings
DC-DCn Converter output voltage
Maximum output = 3.4V.
R186 (BAh) for
DC-DC3
110 0110 = 3.4V
110 0010 = 3.3V
101 0110 = 3.0V
100 1110 = 2.8V
……
R189 (BDh) for
DC-DC4
010 0110 = 1.8V
000 1110 = 1.2V
000 0110 = 1.0V
000 0000 = 0.85V
R195 (C3h) for
DC-DC6
R182 (B6h) for
DC-DC1
6:0
DCn_VIMG
[6:0]
000 0110
DC-DCn Converter output image voltage
settings in 25mv steps.
Maximum output = 3.4V.
R188 (BCh) for
DC-DC3
110 0110 = 3.4V
110 0010 = 3.3V
101 0110 = 3.0V
100 1110 = 2.8V
……
R191 (BFh) for
DC-DC4
010 0110 = 1.8V
000 1110 = 1.2V
000 0110 = 1.0V
000 0000 = 0.85V
R197 (C5h) for
DC-DC6
Note: n is either 1, 3, 4 or 6 and identifies the individual DC-DC converter
Table 74 Output Voltage Control for DC-DC Converters 1, 3, 4 and 6
When the DC-DC Converters 1, 3, 4 and 6 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 75.
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R180 (B4h) for
DC-DC1
10
DCn_OPFLT
0
Enable discharge of DC-DCn outputs
when DC-DCn is disabled
0 = Enabled - Output to be discharged
1 = Disabled - Output is left floating
R186 (BAh) for
DC-DC3
R189 (BDh) for
DC-DC4
R195 (C3h) for
DC-DC6
Note: n is either 1, 3, 4 or 6 and identifies the individual DC-DC converter
Table 75 Output Float Control for DC-DC Converters 1, 3, 4 and 6
PD, February 2011, Rev 4.4
129
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
