
TC32306FTG
2015-10-01
73
6.10.20 h’1C Peak Hold Settings
Table 6-75 Register (h’1C)
D7
D6
D5
D4
D3
D2
D1
D0
Name
Peak_Ref2
Peak_Ref1
Peak_Ref0
Peak_
Charge1
Peak_
Charge0
NIR_2L0
NIR_L1
NIR_L0
Initial
1
0
0
0
1
0
0
0
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
[D7:D5] Peak_Ref2..0 [Limiter (Peak Hold Voltage Discharge Coefficient)]
When to set ASK Demodulation (h'0A[D4]FSK_ASK = "1") and Data Comparator Quick Charge 2 (h’10[D6]Charge2_en = ”1”),
this setting is valid. Set the discharge time constant of Peak Hold circuit.
Discharge time constant τ: τ
= tr / fbc
tr: Setting value of this register:Peak_Ref2..0 (Refer to the table below.)
fbc: Internal clock signal frequency depends on Bit Rate Filter register:h’0E [D4:D1]BRF_Bit3..0
[D7]Peak_Ref2
[D6]Peak_Ref1
[D5]Peak_Ref0
1/tr
tr
0
0
0
1/64
64
0
0
1
1/128+1/256
85.3
0
1
0
1/128
128
0
1
1
1/256+1/512
170.7
1
0
0
1/256
256
1
0
1
1/512+1/1024
341.3
1
1
0
1/512
512
1
1
1
1/1024+1/2048
682.7
See section 6.5.7 about Peak Hold circuit.
Notice: The cutoff frequency of Bit Rate Filter is derived from 30.32MHz Reference Clock Frequency.
[D4:D3] Peak_Charge1..0 [Limiter (Peak Hold Voltage Charge Coefficient)]
When to set ASK Demodulation (h'0A[D4]FSK_ASK = "1") and Data Comparator Quick Charge 2 (h’10[D6]Charge2_en = ”1”),
this setting is valid. Set the charging time constant peak tracking of Peak Hold circuit.
Charge time constant peak tracking
τ: τ
= tp’ / fbc
tp’: Inverse of “(1/tp)+(1/tr)”
tp: Setting value of this register:Peak_Charge1..0 (Refer to the table below.)
tr: Setting value of this register:Peak_Ref2..0
fbc: Internal clock signal frequency depends on Bit Rate Filter register:h’0E [D4:D1]BRF_Bit3..0
[D4]Peak_
Charge1
[D3]Peak_
Charge0
1/tp
tp
0
0
1/8
8
0
1
1/16
16
1
0
1/32
32
1
1
1/64
64
See section 6.5.7 about Peak Hold circuit.
Notice: The cutoff frequency of Bit Rate Filter is derived from 30.32MHz Reference Clock Frequency.
[D2 ]NIR_2L0
When to use NIR filter (h'10[D1]NIR_Fil_en = "1") and Delay Detection (h'10[D0]Sel_Det = "0"), set this register "0".
When to use NIR filter (h'10[D1]NIR_Fil_en = "1") and Pulse Count Detection (h'10[D0]Sel_Det = "1"), set this register "1".