What is backplane in 7106 7-segment driver IC ?

[Guest]

Hello,

I don't understand what is the meaning of pin 21 of the 7106 7-seg
display driver IC. The Maplin picture says "backplane" , what does it
mean. Can I use this chip as a voltmeter at all, and which one should
I choose ? I understand that the 7106 has easier power supply
requirement since it doesn't need a -5V supply as the 7107 does, but
are there any other consideration ?

 

[Gert van den Heuvel]

Hi,

You should connect pin 21 to the backplane pin of the LCD.

The main difference between the 7106 and the 7107 is that the 7106 is meant
for driving LCDs, while the 7107 can directly drive an LED display.


HTH,


Gert van den Heuvel
webmaster www.HobbyElectronics.info

 

[Guest]

I need to drive three 7-segments led displays, which do I use?

 

[Gert van den Heuvel]

You must use the 7107.
And yes, it means you'll need a negative power supply. Fortunately, the
datasheet shows how to generate it using the clock signal.
Download the datasheet from:
http://www.intersil.com/design/parametric/partsearch.asp?txtprodnr=icl7107
and look at page 11.

 

[Mark Zenier]

I need to drive three 7-segments led displays, which do I use?

The Maxim MAX138, it's a 7107 with a built in negative voltage
generator. Or maybe it's the MAX139 or MAX140. They're all on
one datasheet.

Mark Zenier [email protected] Washington State resident