Integrated Circuits Inc.

aMTP777

MAY 10, 2011

6

TYPICAL APPLICATIONS

Using 3.3V Battery Direct Drive Speaker

Using 4.5V Battery with COUT speaker drive

VSS, VSSA

4.5V

RSTB

PB0

PB1

PB2

OSC

0.1uF

Tr

VOUT2_

COUT

8

1/4W

Speaker

HT7335

Output driving of HT LDO:

HT7133 (30mA, 3.3V)

HT7536 (100mA, 3.6V)

HT7335 (250mA, 3.5V)

Rb

4.7K

Note :

PB0 to PB2 are set to input

C1 and C2 must be connected directly on the VDD/VDDA and

VSS/VSSA pins

VDDA

C1, 0.1uF

Rp=1ohm

VDD

C2, 0.1uF

DAT

SCK

DO

EN

VDDA

VSS, VSSA

3.3V

RSTB

PB0

PB1

PB2

OSC

Crst = 0.1uF

C1, 0.1uF

VOUT1

VOUT2_

COUT

Rrst = 4.7K

Note:

1.

PB0 to PB2 are set to input; PB3 is set to output

2.

C1 and C2 must be connected directly on the VDD, VDDA and VSS, VSSA pins of the chip

R1

1M

SP

Rp=1ohm

VDD

C2, 0.1uF

DAT

SCK

DO

EN