WM8321 datasheet(55/253 Pages) WOLFSON

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Production Data

WM8321

PD, February 2012, Rev 4.0

The OTP Control Register contents for all OTP Verify Commands are detailed in Table 22.

VERIFY COMMAND

OTP CONTROL REGISTER VALUE

OTP Verify Page 0

2480h

OTP Verify Page 1

2481h

OTP Verify Page 2

2482h

OTP Verify Page 3

2483h

OTP Verify All

24A0h

Table 22 OTP Verify Command (Margin 1)

14.4.5 OTP FINALISE COMMAND

The Finalise command sets the OTP finalise bit for the user-programmable pages of the OTP

memory. The Finalise commands are selected by writing 1 to the OTP_FINAL bit.

Note that Page 0 and Page 1 will be programmed and finalised during manufacture; these memory

pages cannot be re-written by users. Following the user Finalise command, Page 2 and Page 3 of the

OTP memory will be prevented from any further OTP Write commands. Each page of the OTP

memory can be programmed only once; the OTP Finalise command ensures that any subsequent

Write commands will have no effect and that the OTP contents are maintained securely.

The OTP memory is selected by setting the OTP_MEM bit to 1. (Note that the WM8321 does not

support this function on the external ICE memory.)

The Customer Finalise bit (CUST_OTP_FINAL) is in Page 2. This page is selected by setting

OTP_PAGE = 10. Note that the Page 2 finalise bit locks the contents of Page 2 and Page 3.

All other bits in the OTP Control Register should be set to 0 when a Finalise command is issued.

(Note that OTP_PROG should be set to 0 when a Finalise command is issued.)

The programming supply voltage PROGVDD is required for the OTP Finalise command. It is also

necessary to overdrive the LDO12VOUT pin from an external supply. See Section 6 for details of the

required supply voltages.

Note that the OTP_FINAL command does not set the CUST_OTP_FINAL bit in the DCRW; it only

sets it in the OTP memory. Care is required when verifying a Finalised OTP page, to avoid an OTP

error indication, as described in Section 14.4.4.

The OTP Control Register contents for the OTP Finalise Command is detailed in Table 23. This is the

only recommended OTP Finalise Command; no variants of the Finalise Command should be used.

FINALISE COMMAND

OTP CONTROL REGISTER VALUE

OTP Finalise Page 2

(Note that this command finalises

the contents of OTP Page 2 and

Page 3.)

2802h

Table 23 OTP Finalise Command

14.4.6 OTP CONTROL REGISTER

The OTP Control register (R16394) is defined in Table 24. Note that some of the OTP Programming

registers are locked by the WM8321 User Key. These registers can only be changed by writing the

appropriate code to the Security register, as described in Section 12.4.

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