FEDL7033-02
ML7033
1
Semiconductor
CR11 (Ringing_ON and Trapezoid crest factors control)
B7
B6
B5
B4
B3
B2
B1
B0
CH2
RING
CH2TG1
TRP2
CH2TG1
TRP1
CH2TG1
TRP0
CH1
RING
CH1TG1
TRP2
CH1TG1
TRP1
CH1TG1
TRP0
CR11
default
0
0
0
0
0
0
0
0
B7
… CH2 Tone Generator 1 (TG1) function select
0 : CH2TG1 works as a non-ringing tone generator (300 to 3400 Hz)
1 : CH2TG1 works as a ringing tone generator (15 to 50 Hz)
The frequency and level of CH2TG1 are set by CR16 to CR17.
B6 to B4
… CH2 ringing tone waveform setting
This 3-bit field determines the type of ringing tone waveform for TG1 on CH2. A
sinusoidal waveform, or a trapezoidal waveform with a crest factor between 1.225 V and
1.375 V at 0.025 V intervals, can be selected as shown in Table 15. For a definition of
‘crest factor’, refer to Figure 13. These bits are valid when the CH2RING (CR11-B7) bit is
set.
B3
… CH1 TG1 function select
0 : CH1TG1 works as a non-ringing tone generator (300 to 3400 Hz)
1 : CH1TG1 works as a ringing tone generator (15 to 50 Hz)
The frequency and level of CH1TG1 are set by CR9 to CR10.
B2 to B0
… CH1 ringing tone waveform setting
This 3-bit field determines the type of ringing tone waveform for TG1 on CH1. A
sinusoidal waveform, or a trapezoidal waveform with a crest factor between 1.225 V and
1.375 V at 0.025 V intervals, can be selected as shown in Table 15. For a definition of
‘crest factor’, refer to Figure 13. These bits are valid when the CH1RING (CR11-B3) bit is
set.
Vp
a
a
CrestFactor =1/ 1− 4a /3
1
Figure 13 Ringing Tone Waveform
Table 15 Crest Factor Setting
B6/B2
TG1 TRP2
B5/B1
TG1 TRP1
B4/B0
TG1 TRP0
Crest Factor
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
OFF
1.225
1.250
1.275
1.300
1.325
1.350
1.375
39/51
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