Imagine UDC-5212 User Manual

UDC-5212 and DTD-5225 Digital Time/Date Display Clocks Installation and Operation Manual 29
Chapter 3: Supporting Information
5225DB Display Module
The 5225DB Display module communicates with the microcontroller
on the 5100DL board via a high speed serial bus. The digits data is
transferred from the microcontroller to a MAX7219 8x8 display driver
IC.
This display driver IC generates all the control functions to drive the
multiplexed digit displays. The segment control lines are fed to a pair of
LM339 voltage comparators. These comparators perform a level-shift
of the display driver output voltage (5 V) to a higher voltage (12 V)
required by the LEDs. This higher voltage signal is then used to turn on
the 2N4401 transistors which provide the current to actually drive the
LED segments.
Similarly, the display driver IC directly controls the sink transistors for
each LED digit. These 2N5323 transistors are capable of passing the
large amounts of current supplied to the LEDs.
The voltage regulator provides 12 Volts for half of the digits, while the
regulator on the 5100DL board provides this voltage for the other half
of the digits.

Imagine UDC-5212 Specifications

General

Brand	Imagine
Model	UDC-5212
Category	Clock
Language	English