Owner's manual

Preliminary
APR6016 Data Sheet
Voice Recording & Playback Device Page 15
Revision 1.0
Sample Application
Fi
g
ure 15 shows a sample application utilizin
g
a
g
eneric
microcontroller and SPI interface for messa
g
e mana
g
ement.
The microcontroller uses three
g
eneral purpose inputs for the
pla
y
, record and skip buttons. Five
g
eneral purpose I/O si
g
-
nals are utilized in the SPI interface. The /RESET and /BUSY
si
g
nal are not used in this desi
g
n.
The output si
g
nal must be amplified in order to drive a
speaker. Several vendors suppl
y
inte
g
rated speaker amplifi-
ers that can be used for this purpose.
A microphone amplifier and AGC are recommended. Both
blocks are optional. Several vendors suppl
y
inte
g
rated micro-
phone/AGC amplifiers that can be used for this purpose.
Note that the AGC circuit can be simplified by using the SQLCAP signal as a
peak detector signal.
Figure 15 Sample Schematic using DIP package
All resistors 2.2 K
/CS
DI
DO
VSSD
NC
NC
NC
ANAOUT-
ANAOUT+
NC
/RESET
VSSA
AUDOUT
SQLCAP
SCLK
VCCD
EXTCLK
/INT
SAC
VSSA
NC
/BUSY
NC
NC
VCCA
ANAIN+
ANAIN-
/SQLOUT
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Generic
Microcontroller
I/O_4
I/O_5
I/O_7
I/O_8
I/O_6
0.1
µ
F
100K
Vcc
/IRQ
I/O_3
I/O_2
I/O_1
Pla
y
Record
Skip
Vcc
1.0 uF
Vcc
Speaker
APR6016 DIP
AGC
Block
Speaker
Am plifier
Vcc
Mic
Pre-Amp
Mic
Vcc
2.2K
2.2K