W528S50 datasheet(14/15 Pages) WINBOND

14 / 15 page

W528SXX

- 14 -

TYPICAL APPLICATION CIRCUIT

Speaker

8 ohm

1/4 watt

OSC

Rosc

TG1

TG2

TG3

TG4/LED2/STPC

LED1

STPB

STPA

SPK

8050 D

39/100 ohm

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 750

Ω.

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 = 39

Ω for 1/2/3 LEDs.

Case 2: VDD = 4.5V, R = 39

Ω 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

Battery

Power on

W528x

VDD

Power on reset

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