TC7126CPL Microchip Technology, TC7126CPL Datasheet - Page 11

IC ADC 3 1/2DGT LCD DVR 40-DIP

TC7126CPL

Manufacturer Part Number
TC7126CPL
Description
IC ADC 3 1/2DGT LCD DVR 40-DIP
Manufacturer
Microchip Technology
Datasheet

Specifications of TC7126CPL

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
Through Hole
Package / Case
40-DIP (0.600", 15.24mm)
Resolution (bits)
3.5bit
Input Channel Type
Differential
Data Interface
Parallel
Supply Voltage Range - Analogue
9V
Supply Current
55µA
No. Of Pins
40
Operating Temperature Range
0°C To +70°C
Digital Ic Case Style
DIP
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Interface
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
TC7126CPLR
TC7126CPLR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TC7126CPL
Manufacturer:
MICROCHIP
Quantity:
12 000
5.0
The TC7126A contains all the segment drivers neces-
sary to directly drive a 3-1/2 digit LCD, including an
LCD backplane driver. The backplane frequency is the
external clock frequency divided by 800. For 3 conver-
sions 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 (visible). This AC drive configuration
results in negligible DC voltage across each LCD seg-
ment, ensuring long LCD life. The polarity segment
driver is ON for negative analog inputs. If V
are reversed, this indicator reverses.
On the TC7126A, when the TEST pin is pulled to V+,
all segments are turned ON and the display reads -
1888. During this mode, LCD segments have a
constant DC voltage impressed.
The display font and segment drive assignment are
shown in Figure 5-1.
FIGURE 5-1:
Assignment
© 2006 Microchip Technology Inc.
Note:
DIGITAL SECTION
Do not leave the display in this mode for
more than several minutes. LCDs may be
destroyed if operated with DC levels for
extended periods.
1000's
Display Font
100's
Display Font and Segment
10's
1's
IN
+ and V
IN
-
5.1
The oscillator frequency is divided by four prior to
clocking the internal decade counters. The four-phase
measurement cycle takes a total of 4000 counts
(16,000 clock pulses). The 4000-count cycle is
independent of input signal magnitude.
Each phase of the measurement cycle has the following
length:
1.
2.
EQUATION 5-1:
3.
The TC7126A is a drop-in replacement for the TC7126
and ICL7126, which offer a greatly improved internal
reference
component value changes are required to upgrade
existing designs.
Where: F
Auto-Zero Phase: 1000 to 3000 counts
(4000 to 12,000 clock pulses).
For signals less than full scale, the auto-zero
phase is assigned the unused reference
integrate time period.
Signal Integrate: 1000 counts
(4000 clock pulses).
This time period is fixed. The integration period
is:
Reference Integrate: 0 to 2000 counts
(0 to 8000 clock pulses).
System Timing
OSC
temperature
is the externally set clock frequency.
T
SI
= 4000
coefficient.
TC7126/A
F
OSC
1
DS21458C-page 11
No
external

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