Outputs; Synchronization Signal; Figure 22: Sync Signal During Transmit Burst; Table 16: Mc45 Synchronization Signal (If Sync Pin Is Set To Mode 0 Via At^ssync) - Siemens MC45 Manual

MC45 Hardware Interface Description
P R E L I M I N A R Y

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 following chapter and 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
accommodates sufficient power supply to the MC45 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 16: MC45 synchronization signal (if SYNC pin is set to mode 0 via AT^SSYNC)

Function
Synchronization
Transmit burst
SYNC signal
*)
The duration of the SYNC signal is always equal, no matter whether the traffic or the
access burst are active.
MC45_HD_01_V00.02a
Pin Pin status
SYNC Low
High
1 Tx 577 µs every 4.616 ms
2 Tx 1154 µs every 4.616 ms
*)
300 µs

Figure 22: SYNC signal during transmit burst

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Description
No operation
Indicates increased power consumption
during transmission.
12.08.2002