WM8321 datasheet(22/253 Pages) WOLFSON

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WM8321

Production Data

PD, February 2012, Rev 4.0

7.3

RESET THRESHOLDS

Unless otherwise noted: TJ = -40°C to +125°C; Typical values are at TJ = +25ºC

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Power On Reset

Power on Reset threshold

VPMIC (LDO12VOUT) voltage

at which device transitions

between NO POWER and

BACKUP states

VPOR, DE-

ASSERT

VPMIC rising

1.18

VPOR, ASSERT

VPMIC falling

1.08

Power on Reset hysteresis

VPOR, HYST

100

Device Reset Control

Device Reset threshold

VPMIC (LDO12VOUT) voltage

at which device transitions

between BACKUP and OFF

states

VRES, DE-

ASSERT

VPMIC rising

1.89

VRES, ASSERT

VPMIC falling

1.80

Device Reset hysteresis

VRES, HYST

Device Shutdown

Shutdown threshold

PVDD voltage at which the

device forces an OFF transition

VSHUTDOWN

PVDD falling

2.7

SYSLO threshold accuracy

PVDD voltage at which SYSLO

is asserted.

VSYSLO

PVDD falling,

VSYSLO set by SYSLO_THR

(2.8V to 3.5V)

-3

SYSOK threshold accuracy

PVDD voltage at which SYSOK

is asserted.

VSYSOK

PVDD rising,

VSYSOK set by SYSOK_THR

(2.8V to 3.5V)

Note the SYSOK hysteresis

margin (VSYSOK, HYST) is added

to SYSOK_THR.

-3

SYSOK hysteresis

VSYSOK, HYST

7.4

REFERENCES

Unless otherwise noted: TJ = +25ºC

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Voltage Reference

VVREFC

0.8

Current Reference

VIREFR

100k

 to GND

0.5

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