參數(shù)資料
型號(hào)： TC7107IPL
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40
封裝： 0.600 INCH, PLASTIC, DIP-40
文件頁(yè)數(shù)： 2/34頁(yè)
文件大小： 482K
代理商： TC7107IPL
TC7106/A/TC7107/A
DS21455D-page 10
2008 Microchip Technology Inc.
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 VIN+ and VIN- are reversed,
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.
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.
Display Font
1000s'
100s'
10s'
1s'
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