Nokia 3105 Servicehandbuch
CCS Technical Documentation
Troubleshooting — BB
RH-48
Issue 1 11/2003
© 2003 Nokia Corporation Confidential
Page 19
Figure 13: Flashing, continued
Charging operation
Battery
In RH-48, a Lithium-Ion cell battery with a capacity of 850 mAh is used. Reading a resis-
tor inside the battery pack on the BSI line indicates the battery size. With an NTC resistor
on PWB, the phone measures the approximate temperature of the battery on the BTEMP
line.
tor inside the battery pack on the BSI line indicates the battery size. With an NTC resistor
on PWB, the phone measures the approximate temperature of the battery on the BTEMP
line.
Temperature and capacity information are needed for charge control. These resistors are
connected to BSI pin of the battery connector and BTEMP of the phone. Phone has
100 k
connected to BSI pin of the battery connector and BTEMP of the phone. Phone has
100 k
Ω pull-up resistors for this line so that they can be read by A/D inputs in the phone.
See the following figures for details.
Figure 14: BL-5C battery pack pin order
CH1 = PURX
CH2 = MBUS
CH3 = FBUSTX
CH4 = FBUSRX
CH2 = MBUS
CH3 = FBUSTX
CH4 = FBUSRX
M easure points
Production test pattern
(J396)
Production test pattern
(J396)
FLASH_3
Data transfer has
started (Fbus_Rx)
started (Fbus_Rx)