AS3933 datasheet(19/64 Pages) AMSCO

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[v1-08] 2015-Sep-02

AS3933 − Detailed Description

AS3933 needs the following external components:

• Power supply capacitor - CBAT - 100 nF.

• 32.768 kHz crystal with its two pulling capacitors - XTAL

and CL - (it is possible to omit these components if the

internal RC oscillator is used instead of the crystal

oscillator).

• One, two, or three LC resonators according to the number

of used channels.

In case the internal RC-oscillator is used (no crystal oscillator is

mounted), the pin XIN has to be connected to the supply, while

pin XOUT should stay floating. Application diagrams with and

without crystal are shown in Figure 2, Figure 3 and Figure 4.

Operating Modes

The diagram in Figure 20 shows how the AS3933 operates.

Figure 20:

Operating Modes Flow Chart

Pattern

Correlation

(Wake=0)

Listening Mode

(WAKE=0)

Data Receiving

(WAKE=1)

Frequency Detection OK

And

Pattern Detection Enabled

Frequency Detection OK

And

Pattern Detection Disabled

Pattern matches

Clear Wake

Time out

Pattern doesn’t

match

Start RSSI

(Wake=1)

Start RSSI

(Wake=0)

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