TC7107ACLW713 Microchip Technology, TC7107ACLW713 Datasheet - Page 10
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TC7107ACLW713
Manufacturer Part Number
TC7107ACLW713
Description
IC ADC 3 1/2DGT LED DVR 44-PLCC
Manufacturer
Microchip Technology
Datasheet
1.TC7107CPL.pdf
(34 pages)
Specifications of TC7107ACLW713
Display Type
LED
Configuration
7 Segment
Digits Or Characters
A/D 3.5 Digits
Current - Supply
800µA
Voltage - Supply
5V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
44-PLCC
Lead Free Status / RoHS Status
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Interface
-
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Part Number
Manufacturer
Quantity
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Part Number:
TC7107ACLW713
Manufacturer:
Microchip Technology
Quantity:
10 000
TC7106/A/TC7107/A
5.0
DIGITAL SECTION (TC7106A)
The TC7106A
(Figure
5-2) contains all the segment
drivers necessary to directly drive a 3-1/2 digit liquid
crystal display (LCD). An LCD backplane driver is
included. The backplane frequency is the external
clock
frequency
divided
by
800.
For
three
conversions per second, the backplane frequency is
60Hz with a 5V nominal amplitude. When a segment
driver is in phase with the backplane signal, the
segment is “OFF.” An out of phase segment drive
signal causes the segment to be “ON” or visible. This
AC drive configuration results in negligible DC voltage
across each LCD segment. This insures long LCD
display life. The polarity segment driver is “ON” for
negative analog inputs. If V
+ and V
- are reversed,
IN
IN
this indicator will reverse.
When the TEST pin on the TC7106A is pulled to V+, all
segments are turned “ON.” The display reads -1888.
During this mode, the LCD segments have a constant
DC voltage impressed. DO NOT LEAVE THE
DISPLAY IN THIS MODE FOR MORE THAN
SEVERAL MINUTES! LCD displays may be destroyed
if operated with DC levels for extended periods.
The display font and the segment drive assignment are
shown in
Figure
5-1.
Display Font
1000s
100s'
10s'
1s '
'
FIGURE 5-1:
Display Font and Segment
Assignment
In the TC7106A, an internal digital ground is generated
from a 6-volt zener diode and a large P channel source
follower. This supply is designed to absorb the large
capacitive currents when the backplane voltage is
switched.
© 2008 Microchip Technology Inc.
DS21455D-page 10