
AS3515 V15
austriamicrosystems
Data Sheet, Confidential
www.austriamicrosystems.com
Revision 3.1
38
- 66
6.13 Charger
6.13.1 General
This block can be used to charge a 4V Li-Io accumulator. It supports constant current and constant voltage charging modes with
adjustable charging currents (50 to 400mA) and maximum charging voltage (3.9 to 4.25V).
6.13.2 Trickle Charge
If the battery voltage is below 3V, the charger goes automatically in trickle charge mode with 50mA charging current and 3.9V endpoint
voltage. In this mode charging current and voltage are not precise, but provide a charger function also for deep discharged batteries. Also
the temperature supervision
6.13.3 Temperature Supervision
This charger block also features a supply for an external 100k NTC resistor to measure the battery temperature while charging. If the
temperature is too high, an interrupt can be generated.
6.13.4 Parameter
Table 39 Charger Parameter
Symbol
Parameter
Notes
Min
Typ
Max
Unit
ICHG_trick
Charging Current
(trickle charge)
BVDD<=3V, CHG_IN = 4.5V - 5.5V
25
50
100
mA
VCHG_trick
Charger Endpoint Voltage
(trickle charge)
BVDD<=3V, CHG_IN = 4.5V
0.72*
CHG_IN
4.1
V
ICHG (0-7) Charging Current
BVDD > 3V, ICHG = 150 – 400mA
INOM
-20%
INOM
+20%
mA
VCHG (0-7) Charging Voltage
BVDD > 3V, end of charge is true
VNOM
-60mV
VNOM
+30mV
V
VON_ABS
Charger On Voltage IRQ
BVDD = 3V
3.1
4.0
V
VON_REL
Charger On Voltage IRQ
CHG_IN-CHG_OUT
170
240
mV
VOFF_REL
Charger Off Voltage IRQ
CHG_IN-CHG_OUT
40
77
mV
VBATEMP_ON Battery Temp. high level
BVDD >3V
380
400
420
mV
VBATEMP_OFF Battery Temp. low level
BVDD >3V
480
500
520
mV
ICHG_OFF
End Of Charge current level
BVDD >3V
10%
INOM
mA
IREV_OFF
Reverse current shut down
CHG_OUT = 5V, CHG_IN = VSS
<1
uA
BVDD=3.6V; Tamb=25C; unless otherwise specified
ams
AG
Technical
content
still
valid