Siemens TC35i - Manual (Page 18)

TC35i Terminal Hardware Interface Description
Confidential / Released
TC35i_T_HD_v01.05 Page 18/37 10.07.2003
3.5.1 Power supply and On/Off control
The power supply of the TC35i Terminal has to be a single voltage source of V
PLUS
=8V…30V
providing a peak current (pulsed 577ms at T=4.615ms) of about 1.1A at 12V during the
active transmission. The uplink burst causes strong ripple (drop) on the power lines. The
drop voltage should not exceed 1V, but the absolute minimum voltage during drops must be
>7.6V. The terminal is protected from supply voltage reversal and overvoltage. An internal
fuse is not removable and intended for electrical safety according to EN60950. To protect
the device from high voltages (>30V) an additional 1.25A quick-break fuse on Pin 1 of the
6-pole Western plug shall be used. In case you wish to use TC35i Terminal with power
packs and batteries observe the EN60950 guidelines.
A switching regulator regulates the input voltage for the internal supply. In POWER DOWN
mode the switching regulator is turned off by the On/Off logic.
A separate voltage regulator supplies the real time clock in the GSM engine.
When power fails for >1ms, TC35i Terminal resets or switches off and for >7s the RTC will
be reset.
1
Pin assignment:
2 free
5 free
1 PLUS
3 PD_IN
4 IGT_IN
6 GND
2
3 4
5
6
Figure 4: Female 6-pole Western plug for power supply, ignition, power down
Mains adapter:
It is recommended to use the adapter of the type approval reference configuration. Ordering
information can be found in Chapter 7. This 12V mains adapter comes with a 6-pole
Western plug and features an internal connection between IGT_IN pin and PLUS pin for
auto ignition (power up).