multiple IC''s using same data pins
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Posts: 46,084
The option you describe closely resembles
self-flagellation. The less masochistic technique is
to use a unique data pin for each IC, while commoning
the clock pin and (separately) commoning the chip
select pin to all IC's. With a common data pin there
is no guarantee that the line will be quiet except for
the data you want.
Bob Pence
--- Aaron Nielsen <snazzyguy2@y...> wrote:
> Hello;
>
> I've ran into a bit of a problem with my project I
> have run out of
> pins however I was looking at the datasheets for the
> IC's I have to
> connect three 74HC165 (parralel in serial out
> register) and two
> ADC0834's. Is my assumption true that if I drive the
> clk inhibit pin
> on the 74hc165 high on all but the one I want to use
> then have all
> the clock pins connect to a common stamp pin and all
> the shift load
> pins connected to another would I be able to read
> only the IC I had
> selected. Also for the adc0834's I was thinking of
> doing the same
> thing however driving the CS pin low on the one I
> don't want to use.
> also if possible I'd like the data pin for all of
> these to be common.
> Will this work or is there a better way of doing it.
>
> Thank You
> Aaron Nielsen
>
>
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
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self-flagellation. The less masochistic technique is
to use a unique data pin for each IC, while commoning
the clock pin and (separately) commoning the chip
select pin to all IC's. With a common data pin there
is no guarantee that the line will be quiet except for
the data you want.
Bob Pence
--- Aaron Nielsen <snazzyguy2@y...> wrote:
> Hello;
>
> I've ran into a bit of a problem with my project I
> have run out of
> pins however I was looking at the datasheets for the
> IC's I have to
> connect three 74HC165 (parralel in serial out
> register) and two
> ADC0834's. Is my assumption true that if I drive the
> clk inhibit pin
> on the 74hc165 high on all but the one I want to use
> then have all
> the clock pins connect to a common stamp pin and all
> the shift load
> pins connected to another would I be able to read
> only the IC I had
> selected. Also for the adc0834's I was thinking of
> doing the same
> thing however driving the CS pin low on the one I
> don't want to use.
> also if possible I'd like the data pin for all of
> these to be common.
> Will this work or is there a better way of doing it.
>
> Thank You
> Aaron Nielsen
>
>
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
__________________________________________________
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