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參數(shù)資料
| 型號： | MSA180 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Piezo Speaker Amplifier |
| 中文描述： | 壓電揚聲器放大器 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 147K |
| 代理商： | MSA180 |
7/16
MSA180
Semiconductor
Application Example for Circuits Containing the MSM6378A/MSM6379 Speech Synthesizers
This example shows how to connect the MSA180 with an MSM6378A or MSM6379 speech
synthesizer using an external transistor and the MODE1 pin. The analog output of both synthesizers
lowers to 0 V in their standby mode. For this reason, the voice signal can be used to control operation
and standby modes of the MSA180. The circuit also controls the voltage via an external transistor.
If this function is not used, leave the BASE pin open.
MSM6378A
or MSM6379
V
DD
AOUT
GND
SP
START SWITCH
C1
C2
A
IN
MSA180
V
DD
BASE
MODE2
V
CC
SP
GND
MODE1
PIEZO SPEAKER
R2
R1
Operation Flow
1. When the start switch is pressed, power is supplied to the V
DD
pins on the MSM6378A or
MSM6379, and operation mode is invoked. Voice output level then rises.
2. When operation mode is involved, the voice signal rises above the GND level, and MODE1 on
MSA180 goes high (H).
3. The BASE pin on MSA180 goes low (L) to drive the external transistor for power-supply control.
4. The audio IC continues to operate using the external transistor as a power supply. The device
continues to operate and voice sounds, even if the start switch is released at this time.
5. When the sound ends, MODE1 on MSA180 falls low (L), the voice signal falls to GND level, and
standby mode ensues.
6. The external transistor for power-supply control is switched off, switching the voice synthesizer
off because the power supply is switched off.
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