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AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
8.8.3
External Clock Source
To clock the AS3932 with an external signal the crystal oscillator has to be enabled ( R1<0> =1). As shown in the Figure 3 the clock must be
applied on the pin XIN while the pin XOUT must stay floating. The RC time constant has to be 15μs with a tolerance of ±10% (e.g. R=680 k Ω
and C=22pF). In the Table 25 the clock characteristics are summarized.
Table 25. Characteristics of External Clock
Symbol
VI
Vh
Parameter
Low level
High level
Conditions
Min
0
0.9 * V DD
Typ
Max
0.1 * V DD
V DD
Units
V
V
Tr
Tf
Rise-time
Fall-time
3
3
μs
μs
T = RC
RC Time constant
13.5
15
16.5
μs
Note: In power down mode the external clock has to be set to V DD .
8.9 Channel Selection in Scanning Mode and ON/OFF Mode
In case only 2 channels are active and one of the Low Power modes is enabled, then the channels 1 and 3 have to be active. If the chip works in
On-Off mode and only one channel is active then the active channel has to be the channel 1.
Both Low Power modes are not allowed to be enabled at the same time.
www.ams.com/LF-Receiver/AS3932
Revision 1.7
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