W528SXX Datasheet, PDF (14/15 Pages) Winbond – ADPCM VOICE SYNTHESIZER(PowerSpeech)

W528SXX
TYPICAL APPLICATION CIRCUIT
V DD
TG1
TG2
TG3
OSC
V DD
TG4/LED2/STPC
LED1
STPB
STPA
SPK
VSS
Rosc
R
39/100 ohm
8050 D
Speaker
8 ohm
1/4 watt
C Rs
s
Notes:
1. In principle, the playing speed determined by ROSC should correspond to the sampling rate during the coding phase.
The playing speed may be adjusted by varying ROSC, however.
2. Rs is an optional current-dividing resistor. If Rs is added, the resistance should be between 470 and 750Ω.
3. Cs is optional.
4. The DC current gain β of transistor 8050 ranges from 120 to 200.
5. All unused trigger pins can be left open because of their internal pull-high resistance.
6. R is used to limit the current on the LED. Case 1: VDD = 3V, R = 39Ω for 1/2/3 LEDs.
Case 2: VDD = 4.5V, R = 39Ω for 2/3 LEDs and R = 100Ω for 1 LED.
7. No warranty for production.
SUPPLEMENT
A. Power Bouncing
If an irregularity (such as bouncing) occurs in the power supply to VDD, as shown in the diagram, the
W528xxx may hang or the logic state machine may lock up. To return the chip to normal operation,
short VDD and VSS for the W528xxx and then release again.
Power bouncing
Power on reset
VDD
W528x
Power on
Battery
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