AS3933 datasheet(34/64 Pages) AMSCO

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Page 33

[v1-08] 2015-Sep-02

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AS3933 − Detailed Description

Figure 36:

Bit Setting for the Operating Frequency Range and Time Windows Generation for the Frequency

Detection

The frequency detection is successful if in two consecutive time

windows the zero threshold counter detects M zero crossing,

where M depends also on the operating frequency range. The

frequency detection criteria can be tighter or more relaxed

according to the setup described in R2<1:0> (see Figure 36).

Figure 37:

Tolerance Settings for Frequency Detection in the Bands

23-150 kHz

Figure 37 shows the value of M for the different tolerance

settings for the operating frequency bands from 23 to 150 kHz.

Figure 38 shows M in case the operating frequency range is the

lowest one (15 to 23 kHz).

Figure 38:

Tolerance Settings for Frequency Detection in the Bands

15-23 kHz

R8<7>

R8<6>

R8<5>

Operating Frequency Range [kHz]

95-150

65-95

40-65

23-40

15-23

R2<1>

R2<0>

16±6

16±4

16±2

n.a

R2<1>

R2<0>

8±3

8±2

8±1

n.a

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