AP89021 Aplus Integrated circuits Inc., AP89021 Datasheet - Page 17

• Manufacturer Part Number: AP89021
• Description: Voice Otp Ic
• Manufacturer: Aplus Integrated circuits Inc.

CPU Parallel Mode
Ver 2.2
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.
Addr[0]
Addr[1]
Addr[2]
Addr[3]
I[0..2]
VIN=+5V
Rin = 860KΩ x (VIN-VOUT) / VIN
HT7335
Integrated Circuits Inc.
VOUT=+3.5V
Fig. 14 5V CPU Control with COUT
R
Rin
OSC
0.1uF
3
RST
OSC
S1
S2
S3
S4
OUT[1..3]
17
VDD,VPP
VSS
COUT
aP89021/010
Rb
C1
T
8Ω 1/4W
Speaker
May 31, 2007