Author Topic: 32:1 low cost mux switch?  (Read 1237 times)

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Offline tozitomTopic starter

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32:1 low cost mux switch?
« on: July 20, 2020, 09:04:07 am »
hi forum,
I've designed a "keyboard sniffer/simulator" with 16 channels input/output - basic working is: a uC receives signals from 16 channels input (keyboard or other), and replicates them via 2x16 channels mux (4067d) - it also comunicates with other board in between via RX/TX bus...
example: if I have COL1 and ROW1 connected on input, I replicate it on output by controlling both mux"ABCD" inputs.

Anyway, I need to do the same but with 32 channels now... and using 32:1 mux seems not to be an option due to high cost of such components (ex = ADG732)! I planned to duplicate the 2x16 channels configuration and control the setup with the uC (ABCD + ENABLE) but wonder if there's out there some 4067D equivalent with 32 channels, or any other simple way to do the job...

Thanks for looking.
« Last Edit: July 20, 2020, 09:08:53 am by tozitom »
 

Offline capt bullshot

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Re: 32:1 low cost mux switch?
« Reply #1 on: July 20, 2020, 09:35:39 am »
I'd use four 4051 type muxes tied together to a 32:1 mux, using the enable pins. Most probably this is smaller and cheaper than a dual 4067 type.
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Offline NiHaoMike

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Re: 32:1 low cost mux switch?
« Reply #2 on: July 20, 2020, 01:38:51 pm »
Also take a look at cheap microcontrollers and FPGAs.
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Offline Scrts

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Re: 32:1 low cost mux switch?
« Reply #3 on: July 20, 2020, 04:37:03 pm »
Also take a look at cheap microcontrollers and FPGAs.

This.
Long time ago I did a mux with Xilinx 9536 CPLD, when other options were not available.
 

Online Kleinstein

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Re: 32:1 low cost mux switch?
« Reply #4 on: July 20, 2020, 05:55:20 pm »
i would consider 4051 (8:1) and using 4 pins from the µC. One does not even need to used the enable pins.
 

Offline tozitomTopic starter

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Re: 32:1 low cost mux switch?
« Reply #5 on: July 22, 2020, 08:51:02 am »
thanks all for your suggestions.
Another point to limit the options is I need it to be "voltage flexible". it will work with different kind of voltages on the "keyboard simulator" side, so the cheap uC/CPLD are not an option I think...
The 40xx has the advantage to work up to 18v on Texas version.
Will compare both options: (2x4067) vs (4x4051).

Thanks again.
« Last Edit: July 25, 2020, 06:51:59 pm by tozitom »
 


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