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參數資料
| 型號： | W52905 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 音頻合成 |
| 英文描述： | ADPCM/PCM Voice Synthesizer(ADPCM/PCM話音合成器) |
| 中文描述： | 20 SEC, SPEECH SYNTHESIZER, UUC18 |
| 文件頁數： | 5/40頁 |
| 文件大小： | 190K |
| 代理商： | W52905 |
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W529XX Application Note
- 5 -
For keypad matrix applications, these four direct trigger inputs can be used together with VSS and pins IO1~IO7
pins to obtain a 32 key matrix.
2. SPK
The SPK pin is a current-type voice output, connected to the internal D/A converter output. The full scale output
of the D/A converter is 5 mA. This output when amplified with a low-power NPN transistor with a
β
of around
120 - 160 is able to drive an external 8-
speaker.
The SPK output application circuit is shown as follows,
The shunt resistor Rs in the figure above is used to adjust the input base current of the NPN transistor in order
to drive the external speaker without distortion. Distortion results from two factors: one is due to saturation of
the transistor due to a large base current, and the other is the through the introduction of Rs which can cut small
signals out of the original waveform. The value of the shunt resistor Rs, can be adjusted to get the desired
voice. A value of around 310
- 750
is recommended. Note that the smaller the resistance, the smaller the
input current to the transistor.
Capacitor C in the figure above is used for low-pass filtering of unwanted high-frequency noise generated from
the D/A converter during sample transitions. Users may adjust the value of C to improve sound quality. Note
that this capacitor can also be omitted without having a major affect on the voice quality.
3. IO1 - IO8
The eight I/O pins can have four functions: SCAN, LED, STOP, and INPUT. All these functions are defined by
the MODE1 and MODE2 registers according to the following I/O function table.
Group
IO8
IO7
IO6
IO5
IO4
IO3
IO2
IO1
0
INPUT/STOP
INPUT/LED
1
FTEST/LED
SCAN/LED
SCAN/LED
2
INPUT/LED
SCAN/STOP
3
LED/STOP
LED/STOP
The MODE1 register selects the group (0~3), and the MODE2 register defines the function of each selected I/O
pin. A "0" for one of these bits selects the first pair of modes indicated; a "1" selects the second pair.
SPK
8
ohm
speaker
8050D
,
NPN
transi stor
R
C
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W-53 | 制造商:RAF Electronic Hardware 功能描述:SPRING, COMPRESSION, 3.6N, 19.1MM; Body Length:19.1mm; Compressed Length:12mm; Compression Load Max:3.6N; External Diameter:6.35mm; Wire Diameter:0.5mm ;RoHS Compliant: Yes |
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| W530-02 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Frequency-multiplying, Peak-reducing EMI Solution |
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| W530-02HT | 制造商:Cypress Semiconductor 功能描述: |
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