Siemens TC65 Specifications download pdf (Page 73)

TC65 Hardware Interface Description

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TC65_HD_V02.000 Page 73 of 120 08.06.2006

3.18 Control Signals

3.18.1 Synchronization Signal

The synchronization signal serves to indicate growing power consumption during the

transmit burst. The signal is generated by the SYNC pin. Please note that this pin can adopt

three different operating modes which you can select by using the AT^SSYNC command:

the mode AT^SSYNC=0 described below, and the two LED modes AT^SSYNC=1 or

AT^SSYNC=2 described in

[1] and Chapter 3.18.2.

The first function (factory default AT^SSYNC=0) is recommended if you want your

application to use the synchronization signal for better power supply control. Your platform

design must be such that the incoming signal accommodates sufficient power supply to the

TC65 module if required. This can be achieved by lowering the current drawn from other

components installed in your application.

The timing of the synchronization signal is shown below. High level of the SYNC pin

indicates increased power consumption during transmission.

Figure 31: SYNC signal during transmit burst

The duration of the SYNC signal is always equal, no matter whether the traffic or the

access burst are active.

Transmit burst

1 Tx 577 µs every 4.616 ms

2 Tx 1154 µs every 4.616 ms

SYNC signal

t = 180 s

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 119 120

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Siemens TC65 Specifications Page 73