User Guide

CBUS connections and electrical characteristics
CBUS connections
Pin name I/O Connection Notes
RAP CbusDa <-> EM ASIC
(N2200)
Serdata Cbus data
EM ASIC
(N2300)
CbusData
RAP CbusClk -> EM ASIC
(N2200)
SerClk Cbus clock, 2.4
MHz
EM ASIC
(N2300)
CbusClk
RAP CbusEn1X -> EM ASIC
(N2200)
Sersel Cbus enable
CBUS electrical characteristics
Description Parameter Min Typ Max Unit Notes
High-level
input voltage
VIH 0.7 x VDDS VDDS V RAP specific
(VDDS = 1.8V)
Low-level
input voltage
VIL 0 0.3 x
VDDS
V
High-level
output
voltage
VOH 0.8 x VDDS VDDS V
Low-level
output
voltage
VOL 0 0.22 x
VDDS
V
Frequency,
CbusClk
f 1 2.4 2.5 MHz
Rise and fall
time
tR/tF EM ASIC (N2300)
specific
CLK, DaOut,
EnX
6 ns
DaIn 25 ns
USB/FBUS connections and electrical characteristics
The USB operates in the low-power bus-mode only. The USB host provides VBUS voltage (5V, 100mA at
maximum) to USB device. The USB VBUS is connected to the input of the EM ASIC (N2300) USB/FBUS regulator,
which output is 3.3V in USB mode.
RM-170; RM-171
System Module Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 9 –29
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