DEVICES SUPPORTED:
Products Supported
Ordering Code
ISD4002-120
ISD4002-150
ISD4002-180
ISD4002-240
ISD4003-04M
ISD4003-05M
ISD4003-06M
ISD4003-08M
ISD4004-08M
ISD4004-10M
ISD4004-12M
ISD4004-16M
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
ISD-ES302
CONTENTS OF KIT:
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−
−
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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.
ISD-ES302.PDF
02/10/06
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