NSB–6
System Module
PAMS Technical Documentation
Page 10
Issue 1 06/2000
E
Nokia Mobile Phones Ltd.
External and Internal Signals and Connections
This section describes the external electrical connection and interface lev-
els on the baseband. The electrical interface specifications are collected
into tables that covers a connector or a defined interface.
DC (charger) connector
DC (charger) connector is physically integrated in the same component
with the accessory interface connector. DC connector has both jack and
contact pads for desk stand.
Service connector
Name
Parameter
Min
Typ
Max
Unit
Remark
MBUS
Serial clock
from the
Prommer
0
2.0
logic low
logic low
0.8
2.85
V
Prommer detection and Seri-
al Clock for synchronous
communication
FBUS_RX
Serial data
from the
Prommer
0
2.0
logic low
logic high
0.8
2.85
V
Receive Data from
Prommer to Baseband
FBUS_TX
Data ac-
knowledge to
the Prommer
0
2.0
logic low
logic high
0.5
2.85
V
Transmit Data from Base-
band to Prommer
GND
GND
0
0
V
Ground
The service connector is used as a flash programming interface for up-
dating (i.e. re–programming) the flash program memory and an electrical
access for services to the engine.
When the flash prommer is connected to the phone supply power is pro-
vided through the battery contacts and the phone is powered up with a
pulse given to the BTEMP line.
Battery connector
The BSI contact on the battery connector is used to detect when the bat-
tery is to be removed to be able to shut down the operations of the SIM
card before the power is lost if the battery is removed with power on. The
BSI contact disconnects earlier than the supply power contacts to give
enough time for the SIM and LCD shut down.
Name
Min
Typ
Max
Unit
Notes
VBATT
3.0
3.9
4.2
V
Battery voltage
BSI
0
2.85
V
Battery size indication
Phone has 100kohm pull up resistor.
SIM Card removal detection
(Treshold is 2.4V@VBB=2.8V)
68
kohm
Battery indication resistor (BLB–2)
22
kohm
Battery indication resistor (service battery)
