
Parallel to this pin of the UEMEK is connected the Test/Flash pad BSI_PULS used when the phone is flashed.
The BSI connection of the battery, BSI_BATT pad of the Flsh/Test interface, is connected to the LS/ALCO AD input
of the UEMEK. Via this A/D converter the Battery Size Indication (BSI)resistor value is determined.
The BSI connection of the battery is also connected to the SIMCardDet input of the UEMEK. When the BSI of the
battery is disconnected the UEMEK will close the SIM bus down immediately, in a well-controlled manner.
Figure 173 PopPort™ bottom connector (charger plug socket & PopPort™ system connector
Table 12 System connector interface description
Pin #
Signal
Notes
1
VCHAR
2
GND
Charge ground
3
ACI
Insertion & removal detection /
Serial data bi-directional 1 kbit/s
4
Vout
Power supply for external
accessories
5
Not used in this product
6
FBUS_RX
Serial data from accessory to
phone /115 kbit/s
7
FBUS_TX
Serial data from phone to
accessory /115 kbit/s
8
GND
Data ground
9
XMIC N
Negative audio in signal
10
XMIC P
Positive audio in signal
11
HSEAR N
Negative audio out signal (left
channel)
12
HSEAR P
Positive audio out signal (left
channel)
13
HSEAR RN
Negative audio out signal (right
channel)
RM-51
Nokia Customer Care
System module and user interface
Page 9–12
Company Confidential
9238460 (Issue 1)
Copyright ©2005 Nokia. All Rights Reserved.