Specifications

AC65/AC75 Hardware Interface Description
3.17 Control Signals
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AC65_AC75_HD_v01.002 Page 68 of 117 2006-10-30
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3.17 Control Signals
3.17.1 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 Section 3.17.2.
The first function (factory default AT^SSYNC=0) is recommended if you want your application to use the syn-
chronization signal for better power supply control. Your platform design must be such that the incoming signal
accommodates sufficient power supply to the AC65/AC75 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 34: SYNC signal during transmit burst
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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
2Tx 1154 every 4.616 msµs
t = 180 µs
SYNC signal
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