Specifications

TC35 / TC37 Hardware Interface Description
TC35_37_HD_02_V03.10 - Released Page 48 of 92 21.12.2001
3.8.2 Outputs
3.8.2.1 Synchronization signal
The synchronization signal serves to indicate growing power consumption during the
transmit burst. The signal is generated by the SYNC pin (pin number 32). Please note that
this pin can adopt two different operating modes which you can select by using the
AT^SSYNC command (mode 0 and 1). For details refer to the "AT Command Set".
To generate the synchronization signal the pin needs to be configured to mode 0 (= default).
This setting 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
accomodates sufficient power supply to the TC35 module if required. This can be achieved
by lowering the current drawn from other components installed in your application. The
characteristics of the synchronization signal are explained below.
Table 15: TC35 synchronization signal (if SYNC pin is set to mode 0 via AT^SSYNC)
Function Pin Status Description
= 0 No operationSynchronization SYNC
= 1 Indicates increased power consumption
during transmission.
Figure 18: TC35 output control signals
*)
The duration of the SYNC signal is always equal, no matter whether the traffic or the
access burst are active.
Transmit burst
576.9 µs
18 µs (approx.)
350 - 400 µs
SYNC signal
*)