Are there any four bit to hex display chips for seven seg displays?
There are none in the 4000 series so....any around?

 

The very old and expensive TIL311 was the closest thing I found. There was a discussion here awhile back on using a PIC.

 

what retard in the electornics industry decided to make EVERY BLOODY seven seg decoder not use HEX....its the most bloody used thing!

 

Think this is the one.
http://forum.allaboutcircuits.com/showthread.php?t=43433

 

what retard in the electornics industry decided to make EVERY BLOODY seven seg decoder not use HEX....its the most bloody used thing!

The guy who said, "This chip needs to be fast, and low cost. We can omit hex, because very few people count hex."

 

Z80!!!! All processors!!! Assembly!!!!!
We all need hex!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

The MAX6954 supports HEX output to multiple 7-, 14- and 16-segment monocolor LED displays with its' input via a serial interface.

http://www.maxim-ic.com/app-notes/index.mvp/id/3210

 

Just use a shift register. That us what I did. I have code for a PIC. Just let me know if you are interested.

 

The MAX6954 is an SPI to seven segment driver. The OP wants binary.

 

There are a couple of results if you search for MC14495 on ebay
Bit pricey, but does the job.

 

I just made a PIC program where it can drive up to 16 seven seg diplays. It needs four IO ports (A to D) and you have the following:
Port A - 8 bit binary number
Port B - The address to save the number / the other four pins are control
Port C - The address selector ( selects which dispaly you want to drive)
Port D - The seven seg out

the trick is to split the 8 bit number into two four bit numbers and then save the first fourbit number into address (x) and the second number into address(x+1)

So when it displays the hex you get an 8 bit number into two hex displays
What do ya think...its also my first free product for the PIC18F45K20

 

I just made a PIC program where it can drive up to 16 seven seg diplays. It needs four IO ports (A to D) and you have the following:
Port A - 8 bit binary number
Port B - The address to save the number / the other four pins are control
Port C - The address selector ( selects which dispaly you want to drive)
Port D - The seven seg out

the trick is to split the 8 bit number into two four bit numbers and then save the first fourbit number into address (x) and the second number into address(x+1)

So when it displays the hex you get an 8 bit number into two hex displays
What do ya think...its also my first free product for the PIC18F45K20

It seems you started liking microcontrollers after you fixed all of your problems with the PICkit 3...

 

yup...thanks tom

 

I just made a PIC program where it can drive up to 16 seven seg diplays. It needs four IO ports (A to D) and you have the following:
Port A - 8 bit binary number
Port B - The address to save the number / the other four pins are control
Port C - The address selector ( selects which dispaly you want to drive)
Port D - The seven seg out

the trick is to split the 8 bit number into two four bit numbers and then save the first fourbit number into address (x) and the second number into address(x+1)

So when it displays the hex you get an 8 bit number into two hex displays
What do ya think...its also my first free product for the PIC18F45K20

So that is 24 pins??? Yikes!

I would think you could do better with POV. You would probably want t a decoder chip or two to select each of the displays.

 

but its a damn good chip
I could use a tiny pic which would take a single Hex number in and drive a single display...this one is for use with cpus like z80 so seeing the data is easier...

 

Sorry for the late reply but I just wanted to mention that this old design works quite well... Use two of them to display a 16-bit number (example silkscreen below)...

Regards, Mike

;
;  // psuedo C code program example
;
;  char DigSel = 0;                     // digit select, 0 or 128
;
;  char SegData [] = { 0b00111111,      // "0"   -|-|F|E|D|C|B|A
;                      0b00000110,      // "1"   -|-|-|-|-|C|B|-
;                      0b01011011,      // "2"   -|G|-|E|D|-|B|A
;                      0b01001111,      // "3"   -|G|-|-|D|C|B|A
;                      0b01100110,      // "4"   -|G|F|-|-|C|B|-
;                      0b01101101,      // "5"   -|G|F|-|D|C|-|A
;                      0b01111101,      // "6"   -|G|F|E|D|C|-|A
;                      0b00000111,      // "7"   -|-|-|-|-|C|B|A
;                      0b01111111,      // "8"   -|G|F|E|D|C|B|A
;                      0b01101111,      // "9"   -|G|F|-|D|C|B|A
;                      0b01110111,      // "A"   -|G|F|E|-|C|B|A
;                      0b01111100,      // "b"   -|G|F|E|D|C|-|-
;                      0b00111001,      // "C"   -|-|F|E|D|-|-|A
;                      0b01011110,      // "d"   -|G|-|E|D|C|B|-
;                      0b01111001,      // "E"   -|G|F|E|D|-|-|A
;                      0b01110001 };    // "F"   -|G|F|E|-|-|-|A
;
;  void Main()
;  { char temp = porta;                 // sample input 
;    CMCON = 7;                         // turn comparator off
;    TRISA = 255;                       // Port A all inputs
;    TRISB = 0;                         // Port B all outputs
;    while(1)                           // loop forever
;    { if(DigSel.b7)                    // if left (hi) digit
;        temp /= 16;                    // use hi nibble, 0..15
;      else                             // otherwise
;        temp &= 15;                    // use lo nibble, 0..15
;      temp = SegData[temp];            // get segment data
;      temp |= DigSel;                  // pick up digit select bit
;      PORTB = temp;                    // update display
;      DelayUS(8000-23);                // delay 8-msecs total
;      DigSel ^= 128;                   // toggle digit select bit
;    }
;  }
;