Advertisement
Notice:
-
Must not set the value of tp (set by register:h'1C [D4:D3] Peak_Charge1..0) smaller than the
value of Quick Charge Coefficient (set by register:h'1B[D7:D6]Charge2_Ref1..0).
-
Set the value of tp (set by register:h'1C [D4:D3] Peak_Charge1..0) much smaller than the value of
tr (set by register:h'1C[D7:D5]Peak_Ref2..0).
-
The peak hold level can be monitored at the register:h'1F[D7:D0]PEAK7..0.
-
Limiter will be bypassed when Data Comparator Quick Charge 2 is not used.
(5)
Signal Detection
In ASK, TC32306FTG is available 2 types of detections, RSSI Detection / Preamble Detection. Those
detections are as same as that in FSK. Noise Detection cannot be available in ASK.
6.5.8
Bit Rate Filter
The cutoff frequency of Bit Rate Filter can be available in 12 steps between 0.436 kHz and 19.78 kHz
by the setting of register:h'0E[D4:D1]. Select and set suitable cutoff frequency regarding demodulated
signal data rate. There are different characteristic of LPF in ASK or FSK. Set the cutoff frequency with
considering them.
The cutoff frequency is only for Bit Rate Filter. Set it to consider the influence of LPF (FSK: fc = 20kHz,
ASK: fc = 40 kHz) of the previous circuit.
Table 6-25 Settings of Bit Rate Filter and Cutoff Frequency including LPF
h'0E[D4]
h'0E[D3]
h'0E[D2]
BRF_Bit3
BRF_Bit2
BRF_Bit1
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
Notice:
The cutoff frequency and the Internal Clock of Bit Rate Filter are derived from 30.32MHz Reference
Clock Frequency.
6.5.9
Data Comparator
Data Comparator shapes the waveform of the demodulated output signal of Bit Rate Filter, and
Cutoff
h'0E[D1]
Frequency
BRF_Bit0
(fc)
0
0
19.8 kHz
0
1
14.0 kHz
1
0
9.90 kHz
1
1
6.98 kHz
0
0
4.95 kHz
0
1
3.49 kHz
1
0
2.48 kHz
1
1
1.74 kHz
0
0
1.24 kHz
0
1
0.872 kHz
1
0
0.619 kHz
1
1
0.436 kHz
0
0
19.8 kHz
0
1
14.0 kHz
1
0
19.8 kHz
1
1
14.0 kHz
Cutoff Frequency including
the previous LPF
FSK
14.1 kHz
11.5 kHz
8.91 kHz
6.60 kHz
4.81 kHz
3.44 kHz
2.46 kHz
1.74 kHz
1.24 kHz
0.872 kHz
0.619 kHz
0.436 kHz
14.1 kHz
11.5 kHz
14.1 kHz
11.5 kHz
27
TC32306FTG
Internal Clock
(fbc)
ASK
17.8 kHz
758 kHz
13.2 kHz
758 kHz
9.62 kHz
379 kHz
6.88 kHz
379 kHz
4.91 kHz
189 kHz
3.47 kHz
189 kHz
2.47 kHz
94.8 kHz
1.74 kHz
94.8 kHz
1.24 kHz
47.4 kHz
0.872 kHz
47.4 kHz
0.619 kHz
23.7 kHz
0.436 kHz
23.7 kHz
17.8 kHz
758 kHz
13.2 kHz
758 kHz
17.8 kHz
758 kHz
13.2 kHz
758 kHz
2015-10-01
Advertisement
