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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 3/4DGT LGC PROBE 40DIP |
| 标准包装： | 10 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.75 位数字 |
| 电流 - 电源： | 1mA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
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TC820
5.0
TYPICAL APPLICATIONS
5.2
Digital Ground (DGND)
5.1
Power Supplies
Digital ground is generated from an internal zener
diode ( Figure 5-3 ). The voltage between V DD and
The TC820 is designed to operate from a single power
supply such as a 9V battery ( Figure 5-1 ). The converter
will operate over a range of 7V to 15V. For battery oper-
ation, analog common (COM) provides a Common
mode bias voltage (see analog common discussion in
the theory of operation section). However, measure-
ments cannot be referenced to battery ground. To do so
will exceed the Negative Common mode voltage limit.
TC820
V DD
V REF +
DGND is the internal supply voltage for the digital
section of the TC820. DGND will sink a minimum of
3 mA.
DGND establishes the low logic level reference for the
TC820 mode select inputs, and for the frequency and
logic probe inputs. The DGND pin can be used as the
negative supply for external logic gates, such as the
logic probe buffers. To ensure correct counter
operation at high frequency, connect a 1 μF capacitor
from DGND to V DD .
DGND also provides the drive voltage for the LCD. The
TC820 40-pin package internally connects the LCD
V DISP pin to DGND, and provides an LCD drive voltage
of about 5V P-P . In the 44-pin package, connecting the
+
–
9V
V REF -
COM
V DISP pin to DGND will provide a 5V LCD drive voltage.
V DD
V IN +
V IN -
+
V IN
–
–
12μA
5V
3.2V
COM
V SS
+
N
Logic
Section
FIGURE 5-1:
Powering the TC820 from a
Single 9V Battery.
A battery with voltage between 3.5V and 7V can be
used to power the TC820, when used with a voltage
TC820
N
P
DGND
doubler, as shown in Figure 5-2 . The voltage doubler
uses the TC7660 and two external capacitors. With this
configuration, measurements can be referenced either
V SS
to analog common or to battery ground.
FIGURE 5-3:
DGND and Com Outputs.
5.3
Digital Input Logic Levels
V DD
Logic levels for the TC820 digital inputs are referenced
+
3.5V to 6V
V REF +
V REF -
COM
TC820
V IN +
V IN -
V IN
+
–
to V DD and DGND. The high level threshold is
V DD – 1.5V, and the low logic level is DGND + 1.5V. In
most cases, digital inputs will be connected directly to
V DD with a mechanical switch. CMOS gates can also
be used to control the logic inputs, as shown in the logic
probe inputs section.
2
8
V SS
5.4
Clock Oscillator
+
10μF
4
TC7660
3
5
10μF
+
The TC820 oscillator can be controlled with either a
crystal, or with an inexpensive resistor capacitor
combination. The crystal circuit, shown in Figure 5-4 , is
recommended when high accuracy is required in the
Frequency Counter mode. The 40 kHz crystal is a stan-
dard frequency for ultrasonic alarms, and will provide a
FIGURE 5-2:
Powering the TC820 from a
1-second time-base for the counter or 2.5 analog-to-
Low Voltage Battery.
? 2007 Microchip Technology Inc.
digital conversions per second. Consult the crystal
manufacturer for detailed applications information.
DS21476C-page 17
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