Ic to drive 7 segement displays and leds

[Bhanuchander]

Display board was designed to drive 3 common anode seven segment displays, 1 common anode five segment displays, 16 LEDs and a buzzer input is provided from micro controller ( CLK ,LOAD,DIN)

used an LED driver IC(P/N-A6833SEPTR-T from Allegro) but now it is not available/obsolete so i thought of use other IC driver which doesn't leads to redesign of entire board,

ps, can you guys help me to solve this problem

 

[Pommie]

The closest I can think of is the MAX7219 which will drive 8 7seg displays or 8*8 individual LEDs or a combination of the two. I think finding a pin compatible chip is highly unlikely. Do you have a link to the data sheet?

Mike.

 

[simonbramble]

You actually want the MAX7221. This is an upgrade to the MAX7219. The MAX7219 has a glitch problem on the SPI bus. It is also wise to put 10k pull down resistors on the SPI lines with either chip. Attached is some code I wrote when I was at Maxim to time the settling of the head on a pint of Guinness (I wrote for the Americans celebrating St Patrick's Day) back in 1998

 

[rocket100]

Seems like an awesome chip! Since I have a bunch of open pins on my micro, I think I am just going to use a shift register chip to control the rows and transistors to sink the current on the columns.