Rainbow Electronics ISD1700 - Manual (Page 18)

ISD1700 SERIES
- 18 -
Example #3: Connecting the SPI Interface to a microcontroller
ISD1700
R
OSC
ERASE
PLAY
REC
AGC
AnaIn
MIC -
MIC+
MISO
MOSI
SCLK
SS
FWD
VOL
24
23
25
26
19
10
11
20
18
22
9
7
6
5
4
*** At 8kHz sampling freq, Rosc = 80 K
Rosc ***
4.7 F μ
FT
0.1 F μ
To uC
SPI
: Digital ground; : Analog ground; : Ground for SP+; : Ground for SP-
Vcc Gnd
V
CCA
SP+
AUD/AUX
V
SSD
V
CCD
V
CCA
0.1 F μ
LED
1 K Ω
V
CCD
*
D1
2
1
28
17
V
CCA
V
CCD
V
CCP
V
SSA
V
CCP
V
SSP1
SP-
V
SSP2
V
CCP
0.1 F μ
0.1 F μ
*
*
21
8
14
16
12
0.1 F μ
*
INT/RDY
27
** **
15
13
Speaker
or Buzzer
V
CCD
Optional
Ω 100 K
vAlert
Optional: based upon the applications
390 Ω
0.1 F μ
V
CC
8050C
Speaker
AUX
AUD
3
RESET
0.1 F μ
Reset
10.1 G OOD A UDIO D ESIGN P RACTICES
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