DISPLAY DRIVERS

Apr 01, 2002

Using the MAX6950 and the MAX6951 LED Display

Drivers with Multiplex Dual-Digit Displays

This application note discusses how to connect the MAX6950 (5 digit) and

MAX6951 (8 digit) 7-segment LED display drivers to multiplex dual digit LED

displays instead of regular single digit 7 segment displays.

This application note discusses how to connect the MAX6950 and MAX6951 7-segment LED display

drivers to multiplex type (internally communed) dual digit displays, instead of regular single digit

displays.

The MAX6950 and MAX6951 are five-digit and eight-digit common-cathode LED display drivers that

use an unusual multiplexing scheme. This multiplexing scheme minimizes the connections between the

driver and the LED display, but requires the segment connections to be different to each of the five

(MAX6950) or eight (MAX6951) digits (Table 1).

Table 1. Standard Driver Connections to Single-Digit Displays

DIG0/SEG0

Pin 6

DIG1/SEG1

Pin 5

DIG2/SEG2

Pin 4

DIG3/SEG3

Pin 3

DIG4/SEG4

Pin 14

DIG5/SEG5

Pin 13

DIG6/SEG6

Pin 12

DIG7/SEG7

Pin 11

SEG8

Pin

10

LED

Digit

0

CC 0

SEG dp

SEG g

SEG f

SEG e

SEG d

SEG c

SEG b

SEG

a

LED

Digit

1

SEG dp

CC1

SEG g

SEG f

SEG e

SEG d

SEG c

SEG b

SEG

a

LED

Digit

2

SEG dp

SEG g

CC2

SEG f

SEG e

SEG d

SEG c

SEG b

SEG

a

LED

Digit

3

SEG dp

SEG g

SEG f

CC3

SEG e

SEG d

SEG c

SEG b

SEG

a

LED

Digit

4

SEG dp

SEG g

SEG f

SEG e

CC4

SEG d

SEG c

SEG b

SEG

a

LED

Digit

5*

SEG dp

SEG g

SEG f

SEG e

SEG d

CC5

SEG c

SEG b

SEG

a