STW5093 Просмотр технического описания (PDF) - STMicroelectronics
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STW5093 Datasheet PDF : 34 Pages
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STW5093
tone range" (i.e. from 15.6Hz to 3984Hz in 15.6Hz step) according to the values described in CONTROL REG-
ISTER CR8 and CR9.
CONTROL REGISTER CR11
Bit BE(7) permits connection of a f1 squarewave PWM Ring signal, amplitude modulated or not by a f2 square-
wave signal, to buzzer driver output BZ. Bits BZ5 to BZ0 define the duty cycle of the PWM squarewave, accord-
ing to the following formula:
Duty Cycle = CR11(5 to 0) x 0.78125%
where CR11(5 to 0) is the decimal equivalent of the binary value BZ5 to BZ0.
When BE = 1, if bits F1 = 1 and F2 = 0 in register CR7, a f1 PWM ring signal is present at the buzzer output,
while if bits F1 = 1 and F2 = 1 in register CR7 the f1 PWM ring signal is also amplitude modulated by a f2 square-
wave frequency. Bit BI (6) allows to chose the logic level at which the duty cycle is referred: BI = 0 means that
duty cycle is intended as the relative width of the logic1, while BI = 1 means that duty cycle is intended as the
relative width of the logic 0. When BE = 0 (or during power down) BZ = 0 if BI = 0 or BZ = 1 if BI = 1.
Table 14. Examples of Usual Frequency Selection (Standard frequency tone range)
Description
Tone 250 Hz
Tone 330 Hz
Tone 425 Hz
Tone 440 Hz
Tone 800 Hz
Tone 1330 Hz
f1 value (decimal)
32
42
54
56
102
170
Theoretic value (Hz)
250
330
425
440
800
1330
Typical value (Hz)
250
328.2
421.9
437.5
796.9
1328.1
Error%
-.00
-.56
-.73
-.56
-.39
-.14
DTMF 697Hz
89
DTMF 770 Hz
99
DTMF 852 Hz
109
DTMF 941 Hz
120
DTMF 1209 Hz
155
DTMF 1336 Hz
171
DTMF 1477 Hz
189
DTMF 1633 Hz
209
697
695.3
-.24
770
773.4
+.44
852
851.6
-.05
941
937.5
-.37
1209
1210.9
+.16
1336
1335.9
-.01
1477
1476.6
.00
1633
1632.8
.00
SOL
LA
SI
DO
RE
MI flat
MI
FA
FA sharp
SOL
SOL sharp
LA
SI
DO
RE
MI
50
392
390.6
-.30
56
440
437.5
-.56
63
494
492.2
-.34
67
523.25
523.5
+.04
75
587.33
586.0
-.23
80
622.25
625.0
+.45
84
659.25
656.3
-.45
89
698.5
695.3
-.45
95
740
742.2
+.30
100
784
781.3
-.34
106
830.6
828.2
-.29
113
880
882.9
+.33
126
987.8
984.4
-.34
134
1046.5
1046.9
+.04
150
1174.66
1171.9
-.23
169
1318.5
1320.4
+.14
19/34
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