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

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