WM8321 datasheet(253/253 Pages) WOLFSON

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Production Data

WM8321

PD, February 2012, Rev 4.0

253

33 REVISION HISTORY

DATE

REV

DESCRIPTION OF CHANGES

CHANGED

October 2010

2.0

SDOUT1 description amended to Open Drain, with external pull-up required.

December

2010

2.0

Default value of PWRSTATE_DLY corrected.

Undervoltage margin specified for all DC-DC converters.

Overvoltage margin specified for DC-DC converters 1,2.

Chip Temperature (AUX_DATA) equation updated.

07/03/11

2.0

Added notes that SLEEP > OFF is not a controlled transition; converters and

regulators are disabled immediately.

RESET pin description updated to note integrated pull-up.

IRQ description updated to note pull-up in Open Drain mode.

System Reset and Device Reset descriptions updated, consistent with the

Summary Table.

Recommended external pull-up resistances added in Pin Description.

Internal pull-up / pull-down resistances added in Electrical Characteristics.

Noted Active High (non-inverted) polarity for GPIO “Power On/Off request”

function is not fully supported in development mode.

25/03/11

3.0

Noted maximum limit on Software Resets. Also clarification of the maximum

number of Watchdog / Undervoltage Device Resets.

Correction to DBVDD test conditions (Section 7.7).

RTC_PINT_FREQ definition updated.

DC-DC output inductor saturation limit recommendations added.

SYSOK_THR register description updated.

Quiescent current characteristics updated for DC-DC 1-4.

15/09/11

4.0

Backup battery power updated; Charger control registers deleted.

LDO11 output amended for LDO11_VSEL_SRC=1 and DC-DC1 disabled.

OTP Register Map overview correction (GPn_TRI replaced with GPn_ENA).

LDO11 maximum output current increased (only for PVDD ≥ 3.1V).

01/02/12

4.0

Electrical Characteristics updated.

DC3_STNBY_LIM, DC4_STNBY_LIM descriptions updated.

SYSOK_THR description updated.

14/02/12

4.0

Product status updated to Production Data

JMacD

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