3.7.2.3 Antenna Tuning Capacitor Range and Amplitude Detector Range

The antenna detector range is adjusted automatically. The following table provides more information about the different amplitude ranges during amplitude measurement.

Table 3-50. Antenna Tuning Amplitude Detector Range

FEALR.RNGE[1:0]

Amplitude ANT_TUNE

Equivalent FEANT.LVLC[3:0]

0

0.26V peak to 0.52V peak

2/12

1

0.50V peak to 0.93V peak

2/12

2

0.72V peak to 1.35V peak

2/12

3

0.93V peak to 1.75V peak

2/12

The following table shows the control of CTUNE with FEAT.ANTN[3:0]. The CTUNE has a tolerance of ±15%. This must be considered in the application design. Microchip advises against using the ANT_TUNE pin without automatic or end-of-line antenna tuning.

Table 3-51. Antenna Tuning Capacitance Array CTUNE

FEAT.ANTN[3:0]

CTUNE

0

4.00 pF ±15%

1

4.33 pF ±15%

2

4.66 pF ±15%

…

...

14

8.67 pF ±15%

15

9.00 pF ±15%