Hardware Interface Description - KORE Telematics

XT55/56 Hardware Interface Description
Confidential / Released
s
Function Signal name IO Signal form and level Comments
Ignition GSM_IGT I R I ≈ 100kΩ, C I ≈ 1nF
V IL max = 0.5V at Imax = -20µA
V Open max = 2.3V
ON
~~~ |____| ~~~ Active Low ≥ 100ms
Input to switch the mobile
ON.
The line must be driven low
by an Open Drain or Open
Collector driver.
Emergency
shutdown
(Watchdog)
GSM_EMERGOFF I/O
R I ≈22kΩ
V IL max = 0.5V at Imax = -100µA
V Open max = 2.73V
Signal
~~~ |______| ~~~ Active Low ≥
3.2s
Watchdog:
V OL max = 0.35V at I = 10µA
V OH min= 2.25V at I = -10µA
f O min = 0.16Hz
f O max = 1.55Hz
This line must be driven by
an Open Drain or Open
Collector driver.
Emergency shutdown
deactivates the power supply
to the module.
The module can be reset if
GSM_IGT is activated after
emergency shutdown.
To switch the mobile off use
the AT^SMSO command.
To avoid floating if pin is high
impedance, use pull-down
resistor tied to GND. See
Chapter 3.3.2.1.
GSM_EMERGOFF also
indicates the internal
watchdog function.
If unused keep pin open.
Synchronization
GSM_SYNC
O
V OL max = 0.2V at I = 1mA
V OH min = 2.35V at I = -1mA
V OH max = 2.73V
Indicates increased current
consumption during uplink
transmission burst. Note that
timing is different during
handover.
Alternatively used to control
status LED (see Chapter
3.12.2.2).
If unused keep pin open.
1 Tx, 877µs impulse each 4.616ms and
2 Tx, 1454µs impulse each 4.616ms,
with 300µs forward time.
XT55/56_hd_v02.06a Page 91 of 125 17.12.2004