Siemens MC45 Manual page 63

MC45 Hardware Interface Description
P R E L I M I N A R Y
Function Signal name
Ignition /IGT
Emergency /EMERGOFF
shutdown
(Watchdog)
Synchroni- SYNC
zation
SIM interface CCIN
CCRST
CCIO
CCCLK
CCVCC
CCGND
MC45_HD_01_V00.02a
IO Signal form and level
I
R ≈ 100kW, C ≈ 1nF
I I
V max = 0.5V at Imax = -20µA
IL
V max = 2.3V
Open
~~~ ~~~
ON |____| Active Low ³ 100ms
I
R ≈22kW
I
V max = 0.5V at Imax = -100µA
IL
V max = 2.73V
Open
~~~
Signal |______|
Watchdog:
V max = 0.35V at I = 10µA
OL
V min= 2.25V at I = -10µA
OH
f min = 0.16Hz
O
f max = 1.55Hz
O
O V max = 0.2V at I = 1mA
OL
V min = 2.35V at I = -1mA
OH
V max = 2.73V
OH
1 Tx, 877µs impulse each 4.616ms and
2 Tx, 1454µs impulse each 4.616ms, with
300µs forward time.
I
R ≈ 100kW
I
V max = 0.5V
IL
V min = 2.15V at I = 20µA,
IH
V max=3.3V at I = 30µA
IH
O
R ≈47W
O
V max = 0.25V at I = 1mA
OL
V min = 2.3V at I = -1mA
OH
V max = 2.73V
OH
IO
R ≈10kW
I
V max = 0.5V
IL
V min = 1.95V, V max=3.3V
IH IH
R ≈220W
O
V max = 0.4V at I = 1mA
OL
V min = 2.15V at I = -1mA
OH
V min = 2.55V at I = -20µA
OH
V max = 2.96V
OH
O
R ≈220W
O
V max = 0.4V at I = 1mA
OL
V min = 2.15V at I = -1mA
OH
V max = 2.73V
OH
O
R max = 5W
O
CCVCCmin = 2.84V,
CCVCCmax = 2.96V
Imax = -20mA
Ground
Page 63 of 90
Comments
Input to switch the mobile
ON.
The line must be driven
low by an Open Drain or
Open Collector driver.
This line must be driven by
an Open Drain or Open
Collector driver.
Emergency shutdown
~~~
Active Low ³ 3.2s
deactivates the power
supply to the module.
The module can be reset if
/IGT is activated after
emergency shutdown.
To switch the mobile off
use the AT^SMSO
command.
/EMERGOFF also
indicates the internal
watchdog function.
If unused keep pin open.
Indicates increased current
consumption during uplink
transmission burst. Note
that timing is different
during handover.
Alternatively used to
control status LED.
If unused keep pin open.
CCIN = high, SIM card
holder closed (no card
recognition)
Maximum cable length
200mm to SIM card holder.
All signals of SIM interface
are protected against ESD
with a special diode array.
Usage of CCGND is
mandatory. See Chapter
3.7.3 for details on
grounding.
12.08.2002