Samsung SCH-1000 Service Manual page 17

4-5 Desk-Top Rapid Charger
4-5-1 Description
The following document will provide the
specifications for SAMSUNG-SPRINT's battery
charger unit, system #PCS, which be sold as an
accessory to cellular telephone, model SCH-
1000/RC.
The bettery charger sequentially charges two
NiMH batteries that are to be used with the
cellular telephone.
The first slot will be able to accommodate a battery
attached to the cellular telephone. The second slot
can be used a spare battery.
This charger supports several types of protection
mode and intelligent algorithem to cope with
abnormal cheminal reaction, early cut-off,
excessive temperature, battery short/open, etc.
4-5-3 Interface Requirements
I/O DESCRIPTIONS
The interface requirements for the charger base will consist of the following signals.
Wall Adaptor Interface
Signal Technology
+13V Analog
Battery Interface
Signal Technology
BATT1+
BATT1-
NTC1
RR1
BATT2+
BATT2-
NTC2
RR2
Samsung Electronics
Type
Type
Analog I/O
Analog I/O
Analog I
Analog I
Analog I/O
Analog I/O
Analog I
Analog I
Two bi-color LED indicate charging status of each
battery type. Charging current is automatically
controlled and battery type is indentified by the
resistance between BATT_R(RR) and GND(B–)
contact of battery.
4-5-2 Specification
This specification is applied to every unit of
PCS/RC, revision level 0.
Description
I Supply Voltage
Description
Positive Conductor
Negative Conductor
Thermistor Input
Type Check
Positive Conductor
Negative Conductor
Thermistor Input
Type Check
Circuit Description
From/To
Wall Adaptor
From/To
B a t t e r y 1
B a t t e r y 1
B a t t e r y 1
B a t t e r y 1
B a t t e r y 2
B a t t e r y 2
B a t t e r y 2
B a t t e r y 2
4-7