WM8352
Production Data
7.5 BATTERY CHARGER
Test Conditions
TA = +25ºC unless otherwise noted.
PARAMETER
General
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Wall adaptor voltage
LINE
USB
When charging from
wall adaptor
4.0
4.0
5.5
5.5
V
V
V
USB voltage
When charging from
USB power rail
Target voltage
CHG_VSEL=00
CHG_VSEL=01
CHG_VSEL=10
CHG_VSEL=11
4.0
4.05
4.1
4.05
4.1
4.1
4.15
4.2
4.15
4.15
4.2
4.25
Defective battery threshold
End of Charge Current
2.85
V
EOC
Programmable in
register R168
20 to 90
mA
CHG_EOC_SEL bits
Trickle Charging
Trickle charge initiation
threshold (WM8352 starts
trickle charging when battery is
below this threshold)
CHG_VSE
L - 100mV
V
50mA trickle charge current
100mA trickle charge current
Fast Charging
CHG_TRICKLE_SEL
= 0 (default)
35.9
78.6
mA
mA
CHG_TRICKLE_SEL
= 1
Fast charge threshold (WM8352
can only fast-charge if battery is
above this threshold)
3.1
V
Maximum fast-charge current
IMAX
750
mA
Backup Battery (VRTC)
Backup battery charger output.
(Note that this backup charger
voltage also determines the
UVLO threshold.)
2.5
2.7
2.9
V
7.6 CURRENT LIMIT SWITCH
Test Conditions
TA = +25ºC unless otherwise noted.
PARAMETER
CONDITION
MIN
2.7
TYP
MAX
UNITS
V
Maximum input voltage
On resistance (at 3.3V)
Current limit flag threshold
Current limit
LINE
2.0
180
215
7
ꢀ
mA
mA
μA
Quiescent current (EN but not ON)
Quiescent current (EN and ON)
μA
PD, February 2011, Rev 4.4
22
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
