help on zn449e analog-digital converter setup

[LightningEagle]

Hello,

As stated in the subject, I am looking for help on using a zn449e analog-digital converter.

I have looked through the datasheet several times without getting the feeling of enlightenment. Maybe I am just dumb, but I can't get to a working setup for some reason.

I have tried to recreate the setup on page 12 in the datasheet, but without luck.
I am primarily puzzled by BUSY, RD, CLOCK and WR.

I hope someone here might be able to help me.

The zn449e is meant to communicate with a PIC16F628A or rather, the 8 pins for the 8 bits are to be connected to PORT A on the PIC, which is meant to store the value.

Thanks in advance. : )

 

[karesz]

Hi,
Check it as simplest version, maybe as "continuous conversion" or standalone ADC...
You can find more simple ADCs i.e. from National_if you wish.
K.

 

[betwixt]

It's quite an old device!

Basically, look at the pins this way:

BUSY = a conversion is in progress so don't read the outputs yet.

RD = enables the output drivers, turn them off until needed if the outputs share a bus with other devices. Usually, the pin is called something like 'output enable'.

CLOCK = moves to the next successive step in the conversion process. You need to toggle this bit as many times as there are bits in the result you want.

WR = starts the conversion process, think of it as a 'start conversion' signal.

Hope that helps!

Brian.