Production Data
WM8325
7.3 RESET THRESHOLDS
Unless otherwise noted: TJ = -40°C to +125°C; Typical values are at TJ = +25ºC
PARAMETER
Power On Reset
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Power on Reset threshold
VPMIC rising
VPOR, DE-
ASSERT
1.18
1.08
V
V
VPMIC (LDO12VOUT) voltage
at which device transitions
between NO POWER and
BACKUP states
VPMIC falling
VPOR, ASSERT
Power on Reset hysteresis
Device Reset Control
Device Reset threshold
VPOR, HYST
100
mV
VPMIC rising
VPMIC falling
VRES, DE-
ASSERT
1.89
1.80
V
V
VPMIC (LDO12VOUT) voltage
at which device transitions
between BACKUP and OFF
states
VRES, ASSERT
Device Reset hysteresis
Device Shutdown
VRES, HYST
90
mV
V
Shutdown threshold
VSHUTDOWN
PVDD falling
PVDD falling,
2.7
PVDD voltage at which the
device forces an OFF transition
SYSLO threshold accuracy
VSYSLO
-3
-3
+3
+3
%
%
PVDD voltage at which SYSLO
is asserted.
VSYSLO set by SYSLO_THR
(2.8V to 3.5V)
SYSOK threshold accuracy
PVDD rising,
VSYSOK
PVDD voltage at which SYSOK
is asserted.
VSYSOK set by SYSOK_THR
(2.8V to 3.5V)
Note the SYSOK hysteresis
margin (VSYSOK, HYST) is added
to SYSOK_THR.
SYSOK hysteresis
VSYSOK, HYST
40
mV
7.4 REFERENCES
Unless otherwise noted: TJ = +25ºC
PARAMETER
SYMBOL
VVREFC
TEST CONDITIONS
MIN
TYP
0.8
MAX
UNIT
V
Voltage Reference
Current Reference
100k to GND
VIREFR
0.5
V
PD, February 2012, Rev 4.0
23
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
