Nokia Mobile Phones NSE-5 Series Service Manual page 24

NSE–5
System Module
Pin IB- Name Function
pin
13 Yes FBUS Serial
_TX _ data out da a u
(f (from
phone to
accesso- accesso-
ry) ry)
12 Yes FBUS Serial
_RX RX data in d t i
(from ac- (from ac-
cessory to
phone) h
11 Yes MBUS Bidirec-
tional seri- ti
al bus al bus
FLAS FLAS
H_CL
K K Flash seri- Flash seri-
al data
clock
(from ac- (f
cessory to cessory to
phone)
Page 2 – 10
Table 3. System/IBI connector
Min Typ Max
0.1
1.7
47
220
47
0
2.0
220
y
)
47
2.2
0
l i
2.0
0
2.1
4.7
220
100
Technical Documentation
(continued)
Unit Description
0.8 V Output low voltage @ I
4 mA (ref. GND)
2.8 V Output high voltage @ I
4 mA (ref. GND)
k Pull–up resistor in phone
k Pull–down resistor in acces-
sory
100 Serial (EMI filtering) resistor
in phone
150 pF Cable capacitance
ms
1 Rise/Fall time
0.8 V Input low voltage (ref. GND)
2.8 V Input high voltage (ref. GND)
k Pull–down resistor in phone
k Pull–up resistor in accessory
k Serial (EMI filtering) resistor
in accessory
150 pF Cable capacitance
ms
2 Rise/Fall time @ 115kbits/s
ms
1 Rise/Fall time @ 230kbits/s
0.8 V Input low voltage (ref. GND)
2.8 V Input high voltage (ref. GND)
0.8 V Output low voltage @ I
4 mA (ref. GND)
2.9 V Output high voltage @ I
100 mA (ref. GND)
k Pull–up resistor in phone
k Pull–down resistor in acces-
sory
Serial (EMI filtering) resistor
in phone
200 pF Cable capacitance
ms
5 Rise/Fall time @ 9600 bits/s
PAMS
OL
OH
OL
OH
Issue 1 07/99