Anode driver needed for common cathode display

Thread Starter

CollieJim

Joined Nov 27, 2004
34
I have a large 4-digit, 7-segment, common cathode display which requires at least 7v to be visible.

I'm using a 74HC138 to select the digit, and tried to use a 74HC238 for the anodes but it's very dim.

Would some sort of buffer chip be useful here?

I'm using a PIC16F1827 and a DS3232 I2C clock module.

TIA
Jim
 

MMcLaren

Joined Feb 14, 2010
859
Hi Jim,

Consider using a Micrel MIC5891 eight bit serial-to-parallel high voltage driver. It has separate VCC and VBB inputs and is perfect for those higher voltage multi-LED-per-segment displays.

Cheerful regards, Mike

 

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