WM8351 datasheet(308/330 Pages) WOLFSON

308 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

308

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R216 (D8h)

Main

Bandgap

Control

MBG_LOAD_FUSES

Enables the current to the bandgap trim fuses.

This must be set to 1 when writing the fuses. To

read the trim value held in the fuse, this bit must

be set and then reset.

Main Bandgap Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R217 (D9h)

OSC Control

OSC_LOAD_FUSES

Enables the current to the bandgap trim fuses.

This must be set to 1 when writing the fuses. To

read the trim value, this bit must be set and then

reset.

Protected by security key.

OSC Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R218 (DAh)

RTC Tick

Control

RTC_TICK_ENA

Enable RTC counting (instruction only)

0 = disabled

1 = enabled

Protected by security key. Reset by state machine.

Default held in metal mask.

RTC_TICKSTS

Status of tick request. This bit can be used to

ensure the RTC is using the value of

RTC_TICK_ENA.

0 = disabled

1 = enabled

Protected by security key.

RTC_CLKSRC

RTC 32Khz clock source.

0 = take 32Khz from 32K OSC

1 = take 32Khz from GPIOx (Alternative GPIO

function)

Protected by security key. Reset by state machine.

Default held in metal mask.

OSC32K_ENA

On chip 32Khz OSC enable

0 = disable

1 = enable

Protected by security key. Reset by state machine.

Default held in metal mask.

9:0

RTC_TRIM[9:0] 00_0000_0000 RTC frequency trim. Used to adjust the count

value of the Tick Gen block to compensate for

crystal inaccuracies. RTC frequency trim is a 10bit

fixed point <4,6> 2's complement number. MSB

Scaling = -8Hz. The register indicates the error (in

Hz) with respect to the ideal 32768Hz) of the input

crystal frequency. e.g.:

Actual crystal freq: 32769.00Hz: Required trim

0xb0001_000000 (+1.000000)

Actual crystal freq: 32767.00Hz: Required trim

0xb1111_000000 (-1.000000)

Actual crystal freq: 32775.58Hz: Required trim

0xb0111_100101 (+7.578125)

Actual crystal freq: 32763.78Hz: Required trim

WM8351 Datasheet(PDF) 308 Page - Wolfson Microelectronics plc

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