Integrated Circuits Inc.

aIVR1004

MAR 12 2015

7

5V CPU Control with COUT

Note:

1. C1 is capacitor from 0.1uF to 2.2uF depends on the kind of Vdd source and sound loudness.

E.g. If COUT is used, C1 can be 0.1uF. However, if PWM direct drive speaker is used, C1

should be at least 2.2uF

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

3. Tr is an NPN transistor with beta larger than 150, e.g. 8050D.

4. Rosc = 610K Ohm with Vdd=3.0V and support sampling rate up to 14KHz

5. For sampling rate higher than 14KHz, smaller value of Rosc should be used.

VDD,VDDA

VSS

RSTB

PB3

OSC

0.1uF

C1

=610K

Tr

VOUT2_

COUT

8

1/4W

Speaker

ACE507A33

PB0

PB1

PB2

VOUT=+3.5V

Addr[0]

Addr[1]

Addr[2]

IO0

VIN=+5V

Note :

PB0 to PB2 set to internal pull-up

Addr[0] to [2] are open drain output drive

Rb

4.7K