Chaps Main Features; Inf - Nokia NSW-5 Series Service Manual

NSW-5
System Module UT5U
– 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:
IRDAEN > 2.5 V
DSPGenPIO(3) B1
FBUSRXD A11
MAD1
R209
D202
FBUSTXD A12
The infrared transceiver module is a stand alone component capable of
infrared transmitting and receiving by transforming signals transmitted in
Page 28
1,7
3 5
VBB
Dual bus
buffer
R212
D350
C352
2 6
R355
V200
X100
12 13 SYSTEM CONNECTOR
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
VBB
R358
R357
V351
V350
6 Vcc
Shut down
R354
4 RxD
Anode 1
C353
IR MODULE
N350
3 TxD
C355
7 SC
8
VBAT
C350
R350
R352
Issue 1 10/00