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參數(shù)資料
| 型號： | UTC7106 |
| 廠商： | 友順科技股份有限公司 |
| 元件分類： | 串行ADC |
| 英文描述： | 3/12 DIGIT,LCD DISPLAY A/D CONVERTERS |
| 中文描述： | 3 / 12位數(shù)字，液晶顯示器的A / D轉換器 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大?。?/td> | 233K |
| 代理商： | UTC7106 |
UTC 7106
CMOS IC
only 10
μ
A of source current, so COMMON may easily be tied to a more negative voltage thus overriding the internal
reference.
V+
UTC
UNISONIC TECHNOLOGIES CO., LTD.
8
QW-R502-018,B
Iz
6.8V
ZENER
V-
V
REF HI
REF LO
UTC 7106
COMMON
REF LO
REF HI
UTC 7106
V
20k
6.8k
ICL8069
V+
1.2V
REFERENCE
FIGURE 2B.
FIGURE 2A.
FIGURE 2. USING AN EXTERNAL REFERENCE
TEST
The TEST pin serves two function. On the UTC 7106 it is coupled to the internally generated digital supply through
a 500
Ω
resistor. Thus it can be used as the negative supply for externally generated segment drivers such as
decimal points or any other presentation the user may want to include on the LCD display. Figures 3 and 4 show
such an application. No more than a 1mA load should be applied.
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 maintained for extended periods.
V+
TO LCD
BACKPLANE
1M
TO LCE
DECIMAL
POINT
21
37
TEST
BP
UTC 7106
FIGURE 3. SIMPLE INVERTER FOR
FIXED DECIMAL POINT
V+
TEST
UTC 7106
BP
DECIMAL
POINT
SELECT
TO LCD
DECIMAL
POINTS
CD4030
GND
V+
FIGURE 4. EXCLUSIVE "OR" GATE FOR
DECIMAL POINT DRIVE
DIGITAL SECTION
Figure 5 show the digital section for the UTC 7106, respectively. In the UTC 7106, 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 capacitive currents when the back plane(BP) voltage is switchied. The BP frequency is the clock
frequency divided by 800. For three readings/sec, this is a 60Hz square wave with a nominal amplitude of 5V. The
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