ams AG AS3932 Примітка до заявки - Сторінка 6
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Друкувати сторінкуApplication Note AS3932 - Migration from ATA5283 (1-channel) to AS3932
2.3
Serial Digital Interface
The AS3932 has a 4-wire serial data interface (CS, SDI, SDO, SCL) while the ATA5283 has no interface,
since no programmability is allowed. The Serial Digital Interface of AS3932 needs to be programmed accordingly
(see p. 16 to p. 18 of AS3932 data sheet).
2.4
Wakeup and data pin
Both AS3932 and ATA5283 have two dedicated pins for the wakeup and data; the only difference is that the
wakeup pin of ATA5283 (WAKEUP) has an inverted meaning compared to AS3932 (WAKEUP=high=no wakeup,
WAKEUP=low=wakeup)
2.5
Manchester clock recovery
Furthermore the AS3932 has a fully integrated Manchester clock recovery, which provides the recovered clock
on the pin CL_DAT. This pin is missing in the ATA5283, thus no clock recovery is possible. In case clock recovery
is not required, the pin CL_DAT of AS3932 can remain floating.
3
Protocol compatibility
The ATA5283 wakes up if a carrier burst of at least 704 periods is followed by a "start gap" (no Signal); an
example is given in the figure 3-1.
Figure 3-1: ATA5283 wakeup protocol description
In order to have full compatibility to ATA5283, AS3932 should be set to frequency detection only (R1<1>=0). In
this way the AS3932 will react to the presence of the carrier signal (WAKE signal goes high as soon as the carrier
Version 1.0, Date: 20/02/2009
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