ISD1700 SERIES
Example #3: Connecting the SPI Interface to a microcontroller
Reset
3
2
24
23
25
REC
PLAY
ERASE
RESET
LED
0.1µF
vAlert
D1
1 KΩ
26
FWD
Vcc
Gnd
**
VCCD
**
19
22
VCCA
VCCD
VCCP
VOL
FT
1
VCCD
VSSD
0.1 F
µ
*
28
VCCA
21
8
VCCA
VSSA
VCCP
7
6
*
µ
0.1 F
SS
VCCP
SCLK
MOSI
MISO
14
16
To uC
SPI
5
4
*
ISD1700
*
VSSP1
µ
0.1 F
µ
0.1
F
12
VSSP2
15
13
10
11
Speaker
or Buzzer
VCC
Speaker
SP+
SP-
MIC+
MIC -
AUD
AUX
17
27
0.1µF
9
AUD/AUX
INT/RDY
8050C
AnaIn
VCCD
Rosc ***
390
Ω
20
18
F
ROSC
AGC
100 KΩ
Optional
0.1µ F
µ
4.7
Optional: based upon the applications
*** At 8kHz sampling freq, Rosc = 80 K
: Digital ground;
: Analog ground;
: Ground for SP+;
: Ground for SP-
10.1
GOOD AUDIO DESIGN PRACTICES
To ensure the highest quality of voice reproduction, it is important to follow good audio design
practices in layout and power supply decoupling. See recommendations from below links or other
Application Notes in our websites.
Design Considerations for ISD1700 Family
AN-CC1002 Design Considerations for ISD1700 Family.pdf
Good Audio Design Practices
http://www.winbond-usa.com/products/isd_products/chipcorder/applicationinfo/apin11.pdf
Single-Chip Board Layout Diagrams
http://www.winbond-usa.com/products/isd_products/chipcorder/applicationinfo/apin12.pdf
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