The TLC548 A/D connected to a timer

richacm said:

Hi,

I have a TLC548 A/D convertor and I want to pulse it every 2 minutes to convert the voltage input to the digital output.

I've set up the circuit for the timer (using a TLC555 timer) and I'm not too sure where I place the output from the timer. Do I connect it to the I/O clock or do I just need to connect it to the CS and forget about the clock?

Thanks,

Craig

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richacm said:

Hi, thanks for the replies. Attached is my circuit to date.

I have a pressure sensor that will take a reading and then update LED displays indicating how full a tank is. At the same time I want to take a sample of the pressure every 2 minutes. This is what the Clock and the ADC are for. The clock will fire the ADC every 2 minutes and a sample is taken. The result is to be stored in to a FIFO store which I will then connect to and get the data (a further project!).

Cheers,

Craig

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richacm said:

OK, so after 2 minutes the clock pulses and has a high setting for 1 second. I attach this to the /CS pin to initiate the conversation.

Since the TLC548 has its own internal clock won't 8 bits of data just appear on the output - I don't need any more. Or do I need to wire to the I/O clk and cycle 8 times to get a high/low value? If this is the case can you point me to any circuits that do this...i.e. delay for X seconds and the clk Y times for Y bits of data.

Thanks for the help,

Craig

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richacm said:

Aha, thanks. This is going to be tricky then

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