Siemens TC35i User Manual download pdf (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.

Pin assignment:

2 free

5 free

1 PLUS

3 PD_IN

4 IGT_IN

6 GND

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).

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Siemens TC35i User Manual Page 18