driving 64 transistors

[bm_masri]

Hello,

I have a newbie question. I'm trying to find CMOS or circuit that using 6 Micro controller pins I need to control 64 transistors. These transistors will driver 64 digits (7-seg LEDs).

My thinking is to use 6 BCD decoder/multipler (if one available) to control these 64 digits (transistors). If that is not possible, how can I control 64 digits with the least amount of PIC pins?

Can someone help me please?

Thanks

 

[kchriste]

Connect some shift registers to the PIC to do this. The 74HC595 is well suited because it has a built in latch as well. Cascade as many as you need using the same 3 pins on the PIC. You can also look at multiplexing the digits to reduce the number of transistors and pins required. Or choose a PIC with more pins.