WM8351 datasheet(44/330 Pages) WOLFSON

44 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

11.6 REGISTER LOCKING

Certain control fields are protected against accidental overwriting. This includes:



Watchdog timer and system control settings in Registers R3, R4, R6 and R12 (03h, 04h, 06h

and 0Ch).



Battery charger control fields in Registers R168, R169 and R170 (A8h, A9h and AAh).

By default, these registers are locked, i.e. writing to them has no effect. However, they can be

unlocked by writing a value of 0013h to Register R219 (DBh).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R219 (DBh)

Security

15:0

SECURITY

[15:0]

0000h

The value 0013h needs to be set in this

security locked registers.

Table 4 Locking and Unlocking Protected Registers

It is recommended to re-lock the protected registers immediately after writing to them. This helps

protect the system against accidental overwriting of register values.

It is recommended to contact Wolfson Applications support for guidance on features that are affected

by Register Locking.

11.7 SPECIAL REGISTERS

11.7.1

CHIP ID

A read instruction from register 0 can be used to confirm that the chip is a WM8351.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R0 (00h)

Chip ID

15:0

CHIP_ID

[15:0]

6143h

Reading this register returns 6143h.

Table 5 Chip ID

11.7.2

DEVICE INFORMATION

The read-only register 1 provides additional information about the WM8351 device.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (01h)

15:12

CHIP_REV

[3:0]

The functional silicon revision - this tracks

changes in functionality which are

separate from ROM mask settings

11:10

CONF_STS

[1:0]

The state of the configuration pins. This

selects what register defaults should be.

7:0

CUST_ID [7:0]

The chip revision number

R2 (02h)

Revision

7:0

MASK_REV

[7:0]

The ROM mask ID

Table 6 Reading Device Information

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