Cinterion MC55i - Terminal Circuit

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
T
r
e
i
b
e
r
D
-
S
u
b
9
-
p
i
n
LED driver
G
S
M
/
G
P
R
S
s
t
a
t
u
s
E
M
C
(
A
u
d
i
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
o
w
e
r
S
u
p
p
l
y
W
e
s
t
e
r
n
j
a
c
k
6
p
i
n
W
e
s
t
e
r
n
4
p
i
n
FME 50 Ohm
VDD
VDD
E
M
C
(
o
n
/
o
f
f
)
R
S
2
3
2
I
n
t
e
r
f
a
c
e
.
/ RXD0, / T XD0,/ RTS0,/ C TS0, / 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
o
d
u
l
e
LED
SIM
RS 232 interface
Audio
ON/ OFF logic
Power supply
Antenna interface
Terminal circuit
A
u
d
i
o
F
l
e
x
c
a
b
l
e
Antenna Interface
Voltage
limiter
DTR
VDD
VMIC
VMIC
DC
DC
5V
BATT+
Lin
.
Reg.
EMC
EN
M
o
d
u
l
e
a
d
a
p
t
e
r
B
o
a
r
d
-
t
o
-
b
o
a
r
d
c
o
n
n
e
c
t
o
r