User Guide

Pin Signal I/O Engine connection Notes
3 BSI -> EM ASIC N2200 BSI Battery size
indication
(fixed resistor
inside the
battery pack)
Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which
is located on the transceiver PWB, at a place where the phone temperature is most stable.
For service purposes, the device SW can be forced into local mode by using pull down resistors connected to
the BSI line.
Internal interfaces
Name of Connection Connector reference
Display X8001 in 1YC FPC
ALS V8004
Vibra M2200
Microphone B2100
Earpiece B8000 in 1YC FPC
IHF speaker B8200 in 1YC FPC
Side keys X1550
Display connector and interface connections
Table 25 Display interface connections
Pin Signal I/O Engine connection Notes
1 VLED1 - <- N2301 VLEDout N2301 is
controlled by
EM ASIC N2300
2 VLED2- <- N2301 VLEDout N2301 is
controlled by
EM ASIC N2300
3 VDDI <- EM ASIC N2200 VAUX Core Voltage
4 GND
5 WRX <- Application
processor
Lcdrdx Read Enable
(active low)
6 DO <- Application
processor
Lcdrmd Data/
Command
select
(high = data
low =
command)
RM-208
System Module Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 9 –27
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