WM8945
Production Data
DESCRIPTION
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
R17 (11h)
0
LDO_UV_STS
0
LDO Undervoltage status
0 = Normal
Status Flags
1 = Undervoltage
LDO Enable
R53 (35h)
LDO
LDO_ENA
0
0
15
14
0 = Disabled
1 = Enabled
LDO_REF_SEL_F
AST
LDO Voltage reference select
0 = VMID (normal)
1 = VMID (fast start)
This field is only effective when
LDO_REF_SEL = 0
LDO_REF_SEL
LDO_OPFLT
0
0
LDO Voltage reference select
0 = VMID
13
12
1 = Bandgap
LDO Output float
0 = Disabled (Output discharged
when disabled)
1 = Enabled (Output floats when
disabled)
LDO_BIAS_SRC
LDO_VSEL
0
LDO Bias Source select
0 = Master Bias
5
1 = Start-Up Bias
00111
LDO Voltage select
4:0
(Sets the LDO output as a ratio of
the selected voltage reference. The
voltage reference is set by
LDO_REF_SEL.)
00111 = Vref x 1.97 (default)
(See Table 37 for range)
Bandgap Reference Control
0 = Disabled
R54 (36h)
Bandgap
BG_ENA
0
15
1 = Enabled
4:0
BG_VSEL[4:0]
01010
Bandgap Voltage select
(Sets the Bandgap voltage)
00000 = 1.200V
… 26.7mV steps
01010 = 1.467V (default)
…
01111 = 1.600V
10000 to 11111 = reserved
(See Table 38 for values)
Table 36 LDO Regulator Control
PD, May 2011, Rev 4.1
60
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
