AMTP777 Datasheet, PDF (6/8 Pages) Aplus Intergrated Circuits – APLUS INTEGRATED CIRCUITS INC

Integrated Circuits Inc.
TYPICAL APPLICATIONS
Rp=1ohm
aMTP777
3.3V
R1
C2, 0.1uF
1M
ROSC=220K
Rrst = 4.7K
Crst = 0.1uF
VDD
OSC
PB0
PB1
PB2
VDDA
VOUT1
VOUT2_
COUT
C1, 0.1uF
SP
RSTB
VSS, VSSA
DAT
SCK
DO
EN
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
Using 3.3V Battery Direct Drive Speaker
HT7335
4.5V
C2, 0.1uF
Rp=1ohm
C1, 0.1uF
ROSC=220K
4.7K
0.1uF
VDD
OSC
PB0
PB1
PB2
VDDA
VOUT2_
COUT
RSTB
VSS, VSSA
DAT
SCK
DO
EN
8Ω 1/4W
Speaker
Tr
Rb
Note :
PB0 to PB2 are set to input
C1 and C2 must be connected directly on the VDD/VDDA and
VSS/VSSA pins
Output driving of HT LDO:
HT7133 (30mA, 3.3V)
HT7536 (100mA, 3.6V)
HT7335 (250mA, 3.5V)
Using 4.5V Battery with COUT speaker drive
6
MAY 10, 2011