Multiplex or Non-Multiplex

[Jwillis]

I'm wanting to fix an old Multimeter because it has a certain sentimental value to it.

I think I identified the chip used as an ICL7106 3 1 /2 Digit, LCD Display, A/D Converter. I based it on the surrounding components, values and pin configuration.
I removed the original COB chip as all it did was create heat when voltage is applied.
As you can see there is room to accommodate a 40 pin PDIP .

My problem began when searching the data sheet I ran into a degree of confusion. Now I'm second guessing my order.

The First data sheet from MAXIM states that it drirectly drives a NON-Multiplexed LCD  https://pdf.datasheetcatalog.com/datasheets/560/382681_DS.pdf

Other  data sheets from RENESAS, INTERSIL, and HARRIS state that it includes a Multiplexed Back plan Drive.
 https://www.renesas.com/us/en/document/dst/icl7136-datasheet?r=505941
 https://pdf1.alldatasheet.com/datasheet-pdf/view/67425/INTERSIL/ICL7106.html
 https://pdf.datasheetcatalog.com/datasheet_pdf/harris-semiconductor/ICL7106CM44_to_ICL7107RCPL.pdf

Yet the Pin configurations are the same for the 40 pin PDIP for all manufacturers and the component values are nearly the same for all Manufacturers.

The same thing occurs when searching the ICL7136
 MAXIM https://www.analog.com/media/en/technical-documentation/data-sheets/ICL7136.pdf   Non-multiplex
 RENESAS https://www.renesas.com/us/en/document/dst/icl7136-datasheet  Multiplexed
Again both have the same pin configuration and similar component values.

Google hasn't helped to identify what's what.
What's the difference between non-multiplex and multiplex LCDs and which do I have on this meter?

[asis]

Hi,

It seems to me that by multiplexing we are talking about dynamic LCD indication, as can be seen on the example of the Xerox 600T1616 DMM circuit.
As you can see, the MITEL MD4330B shift register is used.
In your case, you can use ICL7136 because it works with LCD and can replace ICL7106.

https://www.renesas.com/us/en/products/analog-products/data-converters/analog-digital-converters-adc-precision/integrating-display-output-ad-converters/icl7136-3-12- digit-lcdled-low-power-display-ad-converters-overrange-recovery?utm_source=supplyframe&utm_medium=SEP#overview

[Greybeard]

For my understanding it's a non-multiplexed LCD (every single segment has its own pin for contacting).

[Jwillis]

Hi,

It seems to me that by multiplexing we are talking about dynamic LCD indication, as can be seen on the example of the Xerox 600T1616 DMM circuit.
As you can see, the MITEL MD4330B shift register is used.
In your case, you can use ICL7136 because it works with LCD and can replace ICL7106.

https://www.renesas.com/us/en/products/analog-products/data-converters/analog-digital-converters-adc-precision/integrating-display-output-ad-converters/icl7136-3-12- digit-lcdled-low-power-display-ad-converters-overrange-recovery?utm_source=supplyframe&utm_medium=SEP#overview

Yes the ICL7136 does look like a viable replacement for the ICL7106. I will have to give that a try as well.

For my understanding it's a non-multiplexed LCD (every single segment has its own pin for contacting).

I think I'm beginning to understand this now. Through stumbling around I found this. Where Dave Jones referred to it as Static.


What still remains is to Why 3 out of the 4 manufacturers say the ICL7106 has Multiplex drive when they are in fact it has Non-multiplex(Static) drive.