W523SXX Datasheet, PDF (13/14 Pages) Winbond – HIGH FIDELITY PowerSpeech-TM

W523SXX (PRELIMINARY)
2. Rs is an optional current-dividing resistor. If Rs is added, the resistance should be between 390 and 820 ohm.
3. The typical Rosc = 1.2 Mohm for 3 MHz Fosc; and Rosc = 2.4 Mohm for 1.5 MHz Fosc.
4. Cs is optional.
5. The DC current gain of the NPN transistor ranges from 120 to 200.
6. All unused trigger pins can be left open because of their internal pull-high resistance.
7. The OSC layout in customer’s PCB should be as closed as the OSC pad to avoid noise coupling.
8. The chip’s substrate must be wired to Vss.
2. PWM output:
VDD (2.4V ~ 5.5V)
Rosc
VDD1 VDD2
OSC
LED1
TEST
STPA/BUSY
STPB
TG1
LED2/STPC
TG2
STPD
W523Sxx
TG5
STPE
TG6
AUD/SPK+
SPK-
/RESET VSS1 VSS2
10 uF
LED 100 ohm
LED 100 ohm
Speaker
8 ohm
¼ watt
Note:
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 varing Rosc, however.
2. The typical Rosc = 1.2 Mohm for 3 MHz Fosc; and Rosc = 2.4 Mohm for 1.5 MHz Fosc.
3. The capacity, 10 uF, is necessary to reduce voltage fluctuation while PWM outputting.
4. All unused trigger pins can be left open because of their internal pull-high resistance.
5. The OSC layout in customer’s PCB should be as closed as the OSC pad to avoid noise coupling.
6. The chip’s substrate must be wired to Vss.
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Publication Release Date: Oct 2000
Revision A5