Integrated Circuits Inc.

aP89021/010

Ver 4.0

Aug 23, 2010

17

CPU Parallel Mode

Fig. 14 5V CPU Control with COUT

Note:

1. C1 is capacitor from 0.1uF to 4.7uF depends on the kind of Vdd source and sound loudness.

2. Rb is base resistor from 120 Ohm to 390 Ohm depends on Vdd value and transistor gain.

3. T is an NPN transistor with beta larger than 150.

4. Reference value for the above components are C = 2.2uF, Rb = 390 Ohm and T = 8050D.

5. Refer to the Oscillator Resistor Table for suitable value of Rosc.