ISD-ES302.PDF

02/10/06

DEVICES SUPPORTED:

CONTENTS OF KIT:

−

Two AA Battries

−

16 Ohm Speaker

−

ES302 Demo board with user’s guide

−

Three ISD4003 PDIP Samples

OVERVIEW:

The ES302 Demo board is designed to let listeners hear the voice quality of the 3 volt part and to

demonstrate some of the features available through the SPI bus control.

HARDWARE:

The three major Integrated Circuits on the board are the ISD4000 voice chip, U2, the NSC COP820C

microcontroller, U4, and an audio chip, U3. The audio chip is an ISD1020 of which only the microphone

preamplifier and the speaker driver are used. It is run on 5 V whereas the ISD4000 is run on 3 V. The

audio chip would not normally be needed because the audio input and speaker output functions are

already on the board in a cellular phone, for example. The board is powered by two AA cells on the

bottom side. These cells drive a voltage converter to get the 5 V for the audio chip and the

microcontroller. This voltage is then regulated down to 3 V (or 3.3 VDC) for the ISD4000 device.

SOFTWARE:

The COP microcontroller provides the interface between the user’s fingers on the keyboard and the

ISD4000 device. It interprets the key strokes and issues the appropriate commands to the ISD4000. It

also monitors the ISD4000 status registers and Interrupt Output to keep track of operations.

Products Supported

Ordering Code

ISD4002-120

ISD-ES302

ISD4002-150

ISD-ES302

ISD4002-180

ISD-ES302

ISD4002-240

ISD-ES302

ISD4003-04M

ISD-ES302

ISD4003-05M

ISD-ES302

ISD4003-06M

ISD-ES302

ISD4003-08M

ISD-ES302

ISD4004-08M

ISD-ES302

ISD4004-10M

ISD-ES302

ISD4004-12M

ISD-ES302

ISD4004-16M

ISD-ES302