Integrated Circuits Inc.

aIVR8511

Oct 06, 2009

8

5V CPU Control with COUT

Note for COUT speaker drive:

1. C1 must be connected as close to the chips VDD and VSS pins as possible.

2. Rb is base resistor from 120 Ohm to 390 Ohm depends on value of VDD 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 can support sampling rate up to 14KHz.

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

Bonding Diagrams

Note: Substrate must be connected to VSS

VDD,VDD

VS

RSTB

PB3

OS

0.1uF

C1, 0.1uF

=610K

Tr

VOUT2

_

8Ω 1/4W

Speaker

HT7335

PB0

PB1

PB2

VOUT=+3.5

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

Rb

4.7K