WM8946ECSSLASHR datasheet(64/175 Pages) WOLFSON

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WM8946

Production Data

PD, July 2012, Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R17 (11h)

Status Flags

LDO_UV_STS

LDO Undervoltage status

0 = Normal

1 = Undervoltage

R53 (35h)

LDO

LDO_ENA

LDO Enable

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 Voltage reference select

0 = VMID

1 = Bandgap

LDO_OPFLT

LDO Output float

0 = Disabled (Output discharged

when disabled)

1 = Enabled (Output floats when

disabled)

LDO_BIAS_SRC

LDO Bias Source select

0 = Master Bias

1 = Start-Up Bias

4:0

LDO_VSEL

00111

LDO Voltage select

(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 39 for range)

R54 (36h)

Bandgap

BG_ENA

Bandgap Reference Control

0 = Disabled

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 40 for values)

Table 38 LDO Regulator Control

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