TC7126ACLW713 Microchip Technology, TC7126ACLW713 Datasheet - Page 16

• Manufacturer Part Number: TC7126ACLW713
• Description: IC ADC 3 1/2DGT LCD DVR 44-PLCC
• Manufacturer: Microchip Technology

Specifications of TC7126ACLW713

• Display Type: LCD
• Configuration: 7 Segment
• Digits Or Characters: A/D 3.5 Digits
• Current - Supply: 55µA
• Voltage - Supply: 9V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Interface: -

TC7126/A
8.0
8.1
Several manufacturers supply standard LCDs to inter-
face with the TC7126A, 3-1/2 digit analog-to-digital
converter.
8.2
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 annunciators for
decimal points, low battery indication, or function indi-
cation may be added, without adding an additional sup-
ply. No more than 1mA should be supplied by the TEST
pin; its potential is approximately 5V below V+ (see
Figure ).
DS21458C-page 16
Crystaloid
Electronics
AND
VGI, Inc.
Hamlin, Inc.
Manufacturer
Note:
TYPICAL APPLICATIONS
Liquid Crystal Display Sources
Decimal Point and Annunciator
Drive
Contact LCD manufacturer for full product list-
ing/specifications.
5282 Hudson Dr.
Hudson, OH 44236
216-655-2429
720 Palomar Ave.
Sunnyvale, CA 94086
408-523-8200
1800 Vernon St., Ste. 2
Roseville, CA 95678
916-783-7878
612 E. Lake St.
Lake Mills,
WI 53551
414-648-2361
Address/Phone
C5335, H5535,
T5135, SX440
FE 0801
FE 0203
LD-B709BZ
LD-H7992AZ
3902, 3933,
3903
Representative
Part Numbers*
FIGURE 8-1:
Annunciator Drives
8.3
The TC7126 is available in an epoxy 64-pin formed
lead package. A test socket for the TC7126ACBQ
device is available:
Part Number:
Manufacturer:
Distribution:
8.4
The TC7126A’s true differential input and differential
reference make ratiometric reading possible. In a ratio-
metric operation, an unknown resistance is measured
with respect to a known standard resistance. No
accurately defined reference voltage is needed.
The unknown resistance is put in series with a known
standard and a current passed through the pair. The
voltage developed across the unknown is applied to the
input and the voltage across the known resistor is
applied to the reference input. If the unknown equals
the standard, the display will read 1000. The displayed
reading can be determined from the following
expression:
EQUATION 8-1:
Displayed (Reading) =
Flat Package
Ratiometric Resistance
Measurements
TC7126A
TC7126A
Simple Inverter for Fixed Decimal Point
TEST
V+
V+
TEST 37
Multiple Decimal Point or
BP
BP
or Display Annunciator
Annunciator Driver
21
To LCD
Decimal
Point
Decimal Point and
IC 51-42
Yamaichi
Nepenthe Distribution
2471 East Bayshore, Ste. 520
Palo Alto, CA 94043
[phone]
© 2006 Microchip Technology Inc.
R
R
4049
STANDARD
UNKNOWN
GND
V+
4030
GND
V+
To LCD
Decimal
Point
To
Backplane
To LCD
Decimal
Point
x 1000