ISD-ES302.PDF

02/10/06

INSTRUCTIONS:

The keyboard on the ES302 Demo board consists of a 2 x 3 matrix of various colored keys. As with

many microcontroller project boards, ISD has also provided the white MASTER_RESET button at the

bottom of the board in case of program lockup.

To operate the board, insert the desired ISD4000 product into the U2 socket. This can be any one of the

four sample rates for comparison of the voice quality versus time duration listening. Power ON the board

with S11 at the right hand side of the board. Up is the “ON” position. This applies the 3 V from the

batteries to the converter chip. Check that the speaker is plugged into JP2 so that you can hear the

results.

The six push-buttons are labeled on the PCB. Pushing the Yellow “Go_to_Beg” button will reset the

address pointer to the front of the chip or address 000. The indication that this has been done will be a

double flash of the LED, D11, in the bottom left corner of the PCB.

Pushing the Red “Record” button will turn on the Red LED to indicate that the chip is now recording

anything it hears at the microphone M1 near the top center of the board. The board will continue to

Record until the end of the chip is reached or the Black “Stop” button is pressed. At that time the LED

will go out and the board will stop Recording.

Pushing the White “Play_Last” button (or pushing the Yellow “Go_to_Beg” button, and then the White

“Play_Next” button) will playback what you have just recorded. This message will play through to its end

or stop when you press the Black “Stop” button.

The Blue “Skip_to_Next” button will let you bypass a message and play the one after that message. For

example, had you recorded three messages, beginning at the front of the chip, and gone back to the

beginning after the last message then you could press the White “Play_Next” button to play message #1,

press the Blue “Skip_tp_Next” button to bypass message #2 and then press the White “Play_Next” to

play message #3.