MC55i Terminal Hardware Interface Description
3.4 Terminal Circuit
32
MC55i_Terminal_HD_v01.201a
Page 21 of 47
2010-04-16
Confidential / Released
3.4
Terminal Circuit
Figure 3:
MC55i Terminal circuit block diagram
R
S
2
3
2
Tr
ei
b
e
r
D
-S
u
b
9-
pi
n
LED driver
G
S
M
/G
P
R
S
st
at
us
E
M
C
(A
u
di
o)
EMC
( Power)
Overvoltage
protection
Regulator
Power on/off
logic
IGT_IN
(Ignition)
/ IGT (Ignition)
Power on/
of
f
BATT+
(Main supply)
Fuse
SIM
Card
Interface
EPN, EPP
MICN, MICP
SYNC
CCxxx
VDD
VPLUS
(Power)
P
ow
er
S
u
pp
ly
W
e
st
er
n
ja
ck
6
pi
n
W
es
te
rn
4
pi
n
FME 50 Ohm
VDD
VDD
E
M
C
(o
n/
of
f)
R
S
23
2
In
te
rf
a
ce
.
/ RXD0,/TXD0,/RTS0,/ CTS0,/DTR0,/DSR0,/ DCD0,/ RING0
U.FL-R-SMT (Antenna reference point)
PD_IN
(Power Down)
/EMERGOFF
(Power Down)
Microphone
supply
VPP
VPP
VDD
VDDLP
(Power down supply)
VDD
8
6
RF cable
G
S
M
M
od
ul
e
LED
SIM
RS 232 interface
Audio
ON/ OFF logic
Power supply
Antenna interface
Terminal circuit
A
ud
io
F
le
x
ca
bl
e
Antenna Interface
Voltage
limiter
DTR
VDD
VMIC
VMIC
DC
DC
5V
BATT+
Lin
.
Reg.
EM
C
EN
M
od
ul
e
ad
ap
te
r
B
oa
rd
-t
o-
bo
ar
d
co
nn
ec
to
r
