
13-30
ML63326 User's Manual
Chapter 13 Voice Synthesis
13.12 Example of Connections Made When Using a Piezoelectric Speaker
The ML63326 has two built-in amplifiers that can directly drive a piezoelectric speaker. When
using this amplifier, it is possible to output the voice and other sounds from a piezoelectric
speaker by externally connecting one capacitor and two resistors. An example of connections
to be made for using a piezoelectric speaker is shown in Figure 13-9.
The AOUT output amplitude can be varied by changing the ratio R
1
:R
2
of the external
resistors. In the example below, since R
1
is 50 k
W
and R
2
is 100 k
W
, the amplitude of the
AOUT output is increased twofold and is output to the SP(–) and SP(+) pins. When selecting
R
1
and R
2
, make sure that the sum of R
1
and R
2
is 100 k
W
or more.
By connecting the SPEN pin with the ENVOICE pin as shown below, the amplifiers will also
become enabled only when the voice synthesis section is enabled.
Figure 13-9 Example of Connections Made When Using a Piezoelectric Speaker
–
+
–
+
ML63326
Open
DACOUT
AOUT
C = 0.1
m
F
R
1
= 50 k
W
SPIN
R
2
= 100 k
W
SP(–)
SP(+)
SPEN
(–)
(+)
ENVOICE
EN
100 k
W
100 k
W
1/2 AV
DD
EN
Piezoelectric speaker
!
Note:
•
When selecting R
1
and R
2
(external resistors), make sure that their resistance values are
: (R
1
) + (R
2
)
≥
100 k
Ω
•
For the (–) and (+) terminals of the piezoelectric speaker, connect either terminal to the
SP(–) or SP(+) pin and tie the other to V
SS
.
Содержание ML63326
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Страница 14: ...Chapter 1 Overview 1 ...
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Страница 38: ...Chapter 2 CPU and Memory Spaces 2 ...
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Страница 50: ...CPU Control Functions Chapter 3 3 ...
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Страница 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Страница 58: ...Interrupt INT326 Chapter 4 4 ...
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Страница 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
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Страница 84: ...Time Base Counter TBC Chapter 6 6 ...
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Страница 122: ...Chapter 9 9 Watchdog Timer WDT ...
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Страница 180: ...Chapter 12 12 Melody Driver MELODY63K ...
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Страница 196: ...13 Chapter 13 Voice Synthesis ...
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Страница 228: ...14 Chapter 14 Shift Register SFT ...
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Страница 236: ...15 Chapter 15 LCD Driver LCD ...
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Страница 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
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Страница 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Страница 256: ...Chapter 17 17 Power Supply Circuit POWER ...
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Страница 321: ...Appendix 60 ML63326 User s Manual Appendix G ...