Ask For Help

[Bakari]

Dear Member,

Could you please tell me why you need to connect the interrupt pin from ISD4002 to the microcontroller while you can read the EOM or OVF flag from the MISO register? Also, why are you connecting the RAC pin? I think it’s possible to keep it floating. Finally, is it required to set a frequency for the SCLK pin from the microcontroller or they will communicate by default without setting any clock?

All my questions are based on my understanding. If there is any thing wrong please inform me. I am sorry for disturbing you. Thanks again for your help.

Best regards,
Bakari

[mister_e]

for the code... sorry i can't post this one. It's prop to a customer but i remind to see some example here... do a search and you'll find them

Yes you can skip the INT pin and read the EOM instead, same for RAC.

I used them to make things simple and retrieve the begin and end address of each message.

ISDs chips are close to be great, the only kind of bug if those 4002, is the pop sound at the begining and at the end... wich can be resolved in hardware... one reason of the RAC and INT.

You don't need to bother about the SCLK frequency... it will work. It's a synchronous communication, not like a simple SERIN/SEROUT where the baudrate is important.

[Bakari]

Dear mister_e,

I am sending this email for you to say thanks a lot for your great efforts (no other questions up to now)... Thaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aanks.

Yours,
Bakari

[Agent36]

ISDs chips are close to be great, the only kind of bug if those 4002, is the pop sound at the begining and at the end... wich can be resolved in hardware... one reason of the RAC and INT.

Hi,
I am having problems with the pop sound can you let me know how you resolved it please? I found a data sheet from winbond giving a solution to the pop when recording, but not during the play back.

Thanks
Nick

[mister_e]

That's a pain, the only way i found was to monitor the address and use a extra mute circuit just before the EOF Interrupt.

[Agent36]

I was thinking of turning the audio amp off a few milli seconds before the pop,
If I record the output audio of the 4002 back to my laptop I can use audio software to determine the average pop time and power down the lm386 before it happens.

When I saw the bit about RAC and INT I thought you might have a way controlling it via the software.

Regards
Nick