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| 型号： | TC7107CLW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DGT LED DVR 44-PLCC |
| 标准包装： | 500 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 800µA |
| 电源电压： | 5V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC |
| 包装： | 带卷 (TR) |
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TC7106/A/TC7107/A
Segment
Drive
LCD Display
Measured
System
V BUF
C AZ
V INT
POL BP
OSC1
V+
V-
GND
V IN +
V IN -
Analog
Common
TC7106A
V REF - V REF +
V+
OSC3
OSC2
V-
V+
V-
Power
Source
GND
+
9V
FIGURE 8-2:
Common Mode Voltage Removed in Battery Operation with V IN - = Analog Common.
The analog common pin serves to set the analog section
reference or common point. The TC7106A is specifically
designed to operate from a battery, or in any
measurement system where input signals are not
referenced (float), with respect to the TC7106A power
source. The analog common potential of V+ – 3.0V gives
a 6V end of battery life voltage. The common potential
external voltage references. External R and C values
do not need to be changed. Figure 8-4 shows analog
common supplying the necessary voltage reference for
the TC7106A/TC7107A.
200
has a 0.001% voltage coefficient and a 15 Ω output
impedance.
With sufficiently high total supply voltage (V+ – V- >
180
160
140
No Maximum Specified
No
Maximum
Specified
Typical
7.0V), analog common is a very stable potential with
excellent temperature stability, typically 20 ppm/°C.
This potential can be used to generate the reference
voltage. An external voltage reference will be
unnecessary in most cases because of the 50 ppm/°C
120
100
80
60
40
Maximum
Limit
Typical
No
Maximum
Specified
Typical
8.4
TEST (Pin 37)
20
0
TC
7106A
ICL7106
ICL7136
The TEST pin potential is 5V less than V+. TEST may
be used as the negative power supply connection for
external CMOS logic. The TEST pin is tied to the
internally generated negative logic supply (Internal
Logic Ground) through a 500 Ω resistor in the
TC7106A. The TEST pin load should be no more than
1 mA.
FIGURE 8-3: Analog Common
Temperature Coefficient.
1
If TEST is pulled to V+ all segments plus the minus sign
will be activated. Do not operate in this mode for more
than several minutes with the TC7106A. With
TEST = V+, the LCD segments are impressed with a
DC voltage which will destroy the LCD.
The TEST pin will sink about 10 mA when pulled to V+.
V- V+
TC7106A
TC7107A
36
V REF +
V REF
V REF - 35
24k Ω
1k Ω
8.5
Internal Voltage Reference
Analog 32
Common
The analog common voltage temperature stability has
been significantly improved ( Figure 8-3 ). The “A”
Set V REF = 1/2 V FULL SCALE
version of the industry standard circuits allow users to
upgrade old systems and design new systems without
? 2008 Microchip Technology Inc.
FIGURE 8-4:
Connection.
Internal Voltage Reference
DS21455D-page 17
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