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參數(shù)資料
| 型號： | HI7106D |
| 廠商： | Intersil Corporation |
| 英文描述： | 3 1/2 Digit, LCD/LED Display, A/D Converter |
| 中文描述： | 3 1 / 2位，液晶/ LED顯示，A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 123K |
| 代理商： | HI7106D |
6
The second function is a “l(fā)amp test”. When TEST is pulled
high (to V+) all segments will be turned on and the display
should read “1888”. The TEST pin will sink about 15mA
under these conditions.
CAUTION: In the lamp test mode, the segments have a constant DC
voltage (no square-wave). This may burn the LCD display if main-
tained for extended periods.
Digital Section
Figures 6 shows the digital section for the HI7106. In the
HI7106, an internal digital ground is generated from a 6V
Zener diode and a large P-Channel source follower.
This supply is made stiff to absorb the relative large capaci-
tive currents when the back plane (BP) voltage is switched.
The BP frequency is the clock frequency divided by 800. For
three readings/sec., this is a 60Hz square wave with a nomi-
nal amplitude of 5V. The segments are driven at the same
frequency and amplitude and are in phase with BP when
OFF, but out of phase when ON. In all cases negligible DC
voltage exists across the segments.
The polarity indication is “on” for negative analog inputs. If
IN LO and IN HI are reversed, this indication can be
reversed also, if desired.
HI7106
V+
BP
TEST
21
37
TO LCD
BACKPLANE
TO LCD
DECIMAL
POINT
1M
FIGURE 4. SIMPLE INVERTER FOR FIXED DECIMAL POINT
HI7106
V+
BP
TEST
DECIMAL
POINT
SELECT
CD4030
GND
V+
TO LCD
DECIMAL
POINTS
FIGURE 5. EXCLUSIVE ‘OR’ GATE FOR DECIMAL POINT DRIVE
7
SEGMENT
DECODE
SEGMENT
OUTPUT
0.5mA
2mA
INTERNAL DIGITAL GROUND
TYPICAL SEGMENT OUTPUT
V+
LCD PHASE DRIVER
LATCH
7
SEGMENT
DECODE
÷
200
LOGIC CONTROL
INTERNAL
DIGITAL
GROUND
V
TH
= 1V
7
SEGMENT
DECODE
1000’s
COUNTER
100’s
10’s
1’s
TO SWITCH DRIVERS
FROM COMPARATOR OUTPUT
÷
4
CLOCK
40
39
38
OSC 1
OSC 2
OSC 3
BACKPLANE
21
V+
TEST
V-
500
37
26
6.2V
COUNTER
COUNTER
COUNTER
1
c
a
b
c
d
f
g
e
a
b
a
b
c
d
f
g
e
a
b
c
d
f
g
e
THREE INVERTERS
ONE INVERTER SHOWN FOR CLARITY
FIGURE 6. HI7106 DIGITAL SECTION
HI7106
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