NSW-5
System Module UT5U
PAMS Technical Documentation
Page 28
Issue 1 10/00
Nokia Mobile Phones Ltd.
– charging control (PWM), charger detection
– watchdog
– sleep clock (32 kHz) and control
– 8–channel AD–converter.
CHAPS Main Features
CHAPS comprises the hardware for charging the battery and protecting
the phone from over–voltage in charger connector.
The main function are
– transient, over–voltage and reverse charger voltage protection
– limited start–up charge current for a totally empty battery
– voltage limit when battery removed
– with SW protection against too high charging current
INF
An infrared transceiver module is implemented as an alternative to a
cable between the phone and a PC. See the figure below:
8
4 RxD
6 Vcc
3 TxD
VBB
VBAT
Anode 1
IR MODULE
N350
MAD1
D202
R350
C355R355
C352
C353
X100
SYSTEM CONNECTOR12 13
R209
A11
A12FBUSTXD
FBUSRXD
7 SC
B1DSPGenPIO(3)
IRDAEN >
2.5 V
R212
R354
1,7
53
26
D350
Enable
V200
R352
C350
V350
R357
R358
V351
Shut down
Dual bus
buffer
VBB
The infrared transceiver module is a stand alone component capable of
infrared transmitting and receiving by transforming signals transmitted in
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