TC7106(2002) View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
TC7106 Datasheet PDF : 26 Pages
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ments (a “111” display) to worst case (a “1888” display),
the resistor will change about 230mW, while a circuit
without the resistor will change about 470mW. There-
fore, the resistor will reduce the effect of display dissi-
pation on reference voltage drift by about 50%.
The change in LED brightness caused by the resistor is
almost unnoticeable as more segments turn off. If dis-
play brightness remaining steady is very important to
the designer, a diode may be used instead of the
resistor.
FIGURE 9-4:
+5V
DIODE OR RESISTOR
LIMITS PACKAGE POWER
DISSIPATION
IN
-5V
+
–
24kΩ
1MΩ
150Ω
TP3
1kΩ
0.47
100
pF
0.01
µF
µF 0.22
µF
TP5
TP2
0.1
Display
100
kΩ
TP1
µF
47
kΩ
40
30
TP
21
4
TC7107A
1
10
20
5.1Ω 1/4W
1N4001
Display
10.0 TYPICAL APPLICATIONS
10.1 Liquid Crystal Display Sources
Several manufacturers supply standard LCDs to inter-
face with the TC7106A 3-1/2 digit analog-to-digital
converter.
Manufacturer Address/Phone
Representative
Part Numbers*
Crystaloid
Electronics
AND
Epson
Hamlin, Inc.
5282 Hudson Dr.
Hudson, OH 44236
216-655-2429
720 Palomar Ave.
Sunnyvale, CA 94086
408-523-8200
3415 Kashikawa st.
Torrance, CA 90505
213-534-0360
612 E. Lake St.
Lake Mills, WI 53551
414-648-236100
C5335, H5535,
T5135, SX440
FE 0201, 0701
FE 0203, 0701
FE 0501
LD-B709BZ
LD-H7992AZ
3902, 3933, 3903
Note: Contact LCD manufacturer for full product listing and
specifications.
TC7106/A/TC7107/A
10.2 Light Emitting Diode Display
Sources
Several LED manufacturers supply seven segment
digits with and without decimal point annunciators for
the TC7107A.
Manufacturer
Hewlett-Packard
Components
AND
Address/Phone Display
640 Page Mill Rd.
LED
Palo Alto, CA 94304
720 Palomar Ave.
LED
Sunnyvale, CA 94086
408-523-8200
10.3 Decimal Point and Annunciator
Drive
The TEST pin is connected to the internally generated
digital logic supply ground through a 500Ω resistor. The
TEST pin may be used as the negative supply for exter-
nal CMOS gate segment drivers. LCD display annunci-
ators for decimal points, low battery indication, or
function indication may be added without adding an
additional supply. No more than 1mA should be sup-
plied by the TEST pin; its potential is approximately 5V
below V+ (see Figure 10-1).
FIGURE 10-1:
DECIMAL POINT DRIVE
USING TEST AS LOGIC
GROUND
V+
V+
TC7106A
BP 21
TEST 37
4049
GND
To LCD
Decimal
Point
To LCD
Backplane
V+ BP
TC7106A
Decimal
Point
Select
TEST
V+
To LCD
Decimal
Point
4030
GND
© 2002 Microchip Technology Inc.
DS21455B-page 17
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