Integrated Circuits Inc.

aP8921A/10A

Ver 2.1

Apr 3, 2007

16

TYPICAL APPLICATIONS

Fig. 12 Using 4.5V Battery

Note 1: Two capacitors Cin and Cout must be connected from VDD and V33 pins to VSS to

stabilize the power supply to the chip.

When small capacity battery, e.g. AG10, is

used, Cin and Cout may need to be as large as 22uF.

However, if Cin and Cout is

too large, the power-up reset generated by 0.1uF at the RST pin may not be function

because it takes longer time for both Cin and Cout to discharge.

Note 2: 16 Ohm speaker will provide lauder and better sound quality when the VOUT speaker

direct drive is used.

Note 3: The value of the 390 Ohm base resistor should be modified according to different Vdd

value, the kind of speaker and NPN transistor.

Note 4: The VPP pin should be leave unconnected for playback.

RST

OSC

S1

S2

S3

S4

SBT

VSS

VDD

V33

COUT

OUT1

VOUT2

VOUT1

4.5~5V

0.1uF

4.7uF

0.1uF

1KΩ

390Ω

8050D

Ros

c

16 Ω

Speaker

8 ΩSpeaker

Cin

1~2uF

Cout