User Guide

FBUS interface electrical characteristics
Description Parameter Min Typ Max Unit Notes
High-level
input
voltage
V
IH
0.7 x
V
DDSHV2
V
DDSHV2
V Helen2/3 specific
(VDDSHV2 =
1.8V)
Low-level
Input
voltage
V
IL
0 0.3 x
V
DDSHV2
V
High-level
output
voltage
V
OH
0.8 x
V
DDSHV2
V
DDSHV2
V
Low-level
output
voltage
V
OL
0 0.22 x
V
DDSHV2
V
Rise/fall
time
tR/tF
0 25 ns
Headset hook detection interface (XMICN) electrical characteristics
Description Min Typ Max Unit Notes
Hook detection
threshold 1
1.25 1.35 1.45 V Two fixed
thresholds
inside Retu.
Selectable by
SW
Hook detection
threshold 2
0.5 0.6 0.7 V
Hook detection
hysteresis
25 mV
Hook detection
pull ups
1 2 4 uA
Audio signal electrical characteristics
Description Parameter Min Typ Max Unit Notes
XMIC N Audio in 1 V
pp
DC Offset 2.5-
2.78V
XMIC P Audio in 1 V
pp
DC Offset 2.5-
2.78V
HSEAR N Audio out 1 V
pp
10Ω nominal
serial
impedance
RM-1
Nokia Customer Care System Module
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