AN874 Maxim Integrated Products, AN874 Datasheet

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AN874

Manufacturer Part Number
AN874
Description
Using the MAX6950 and the MAX6951 LED Display Drivers with Multiplex Dual-Digit Displays
Manufacturer
Maxim Integrated Products
Datasheet
1.AN874.pdf (6 pages)

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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
DISPLAY DRIVERS
LED
Digit
0
LED
Digit
1
LED
Digit
2
LED
Digit
3
LED
Digit
4
LED
Digit
5*
Using the MAX6950 and the MAX6951 LED Display
DIG0/SEG0
SEG dp
SEG dp
SEG dp
SEG dp
SEG dp
Pin 6
CC 0
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.
Drivers with Multiplex Dual-Digit Displays
DIG1/SEG1
SEG dp
SEG g
SEG g
SEG g
SEG g
Pin 5
CC1
DIG2/SEG2
SEG g
SEG g
SEG f
SEG f
SEG f
Pin 4
CC2
DIG3/SEG3
SEG e
SEG e
SEG f
SEG f
SEG f
Pin 3
CC3
DIG4/SEG4
Pin 14
SEG e
SEG e
SEG e
SEG e
SEG d
CC4
DIG5/SEG5
Pin 13
SEG d
SEG d
SEG d
SEG d
SEG d
CC5
DIG6/SEG6
Pin 12
SEG c
SEG c
SEG c
SEG c
SEG c
SEG c
DIG7/SEG7
Pin 11
SEG b
SEG b
SEG b
SEG b
SEG b
SEG b
Apr 01, 2002
SEG8
SEG
SEG
SEG
SEG
SEG
SEG
Pin
10
a
a
a
a
a
a

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AN874 Summary of contents

Page 1

DISPLAY DRIVERS 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 ...

Page 2

LED Digit SEG dp SEG g 6* LED Digit SEG dp SEG g 7* *These digits are not available for the MAX6950. The MAX6950 and MAX6951 were intended to drive single-digit displays, and this allows the segments for each digit ...

Page 3

Table 2. Example Driver Connections to Dual-Digit Displays When No DPs Are Required DIG0/SEG0 DIG1/SEG1 Pin 6 Pin 5 LED Digit CC 0 -unused- 0 LED Digit CC1 -unused- 1 LED Digit SEG g SEG f 2 LED Digit SEG ...

Page 4

Discrete LED LED anode Digit CC1 (cathode to 1 CC0) LED Digit SEG f SEG g 2 LED Digit SEG f SEG g 3 LED Digit SEG d SEG g 4 LED Digit SEG d SEG g 5* LED Digit ...

Page 5

Figure 2. External connections to modify a dual-digit display so that all segments are available Figure 2 shows the correct wiring to the dual-digit used as Digit 0 and Digit 1, which uses external diodes in series with the dp ...

Page 6

LED Digit SEG dp SEG g 6* LED Digit SEG dp SEG g 7* *These digits are not available for the MAX6950. More Information QuickView -- Full (PDF) Data Sheet MAX6950: QuickView -- Full (PDF) Data Sheet MAX6951: SEG d ...

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