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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 15/34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
4.0
4.1
FUNCTION CONTROL INPUTS
PIN
Functional Description
When the TC820 analog-to-digital converter function is
selected, connecting RANGE/FREQ to V DD will divide
the integration time by 10. Therefore, the RANGE/
FREQ input can be used to perform a 10:1 range
change without changing external components.
The TC820 Operating modes are selected with the
function control inputs. See the control input truth,
4.1.4
DP0/LO, DP1/HI
the low logic level is ≤ DGND +1.5V.
The function of these dual purpose pins is determined
by the LOGIC input. When the TC820 is in the Analog-
to-Digital Converter mode, these inputs control the
TABLE 4-1:
TC820 CONTROL INPUT
TRUTH TABLE
LCD decimal points. See the decimal point truth,
to DGND when the Voltage/Frequency Measurement
Logic Input
mode is active.
FREQ/
VOLTS
RANGE/
FREQ
LOGIC
TC820 Function
TABLE 4-1:
TC820 DECIMAL POINT
TRUTH TABLE
X
0
X
0
1
0
Logic Probe
A/D Converter,
DP1
DP0
LCD
V FULL SCALE = 2 x V REF
0
0
3999
0
1
0
A/D Converter,
0
1
399.9
V FULL SCALE = 20 x V REF
1
0
39.99
1
Frequency
0
Frequency Counter
1
1
3.999
Counter
Input
Connecting the LOGIC input to V DD places the TC820
Note 1:
2:
Logic "0" = DGND
Logic "1" = V DD -
in the Logic Probe mode. In this mode, the DP0/LO and
DP1/HI inputs control the LCD "low" and "high"
annunciators directly. When DP1/HI is connected to
4.1.1 FREQ/VOLTS
This input determines whether the TC820 is in the
Analog-to-Digital Conversion mode, or in the
Frequency Counter mode. When FREQ/VOLTS is
connected to V DD , the TC820 will measure frequency
at the RANGE/FREQ input. When unconnected, or
connected to DGND, the TC820 will operate as an
analog-to-digital converter. This input has an internal
5 μA pull-down to DGND.
V DD , the "high" annunciator will turn on. When DP0/LO
is connected to V DD , the "low" annunciator and the
buzzer will turn on. The internal pull-downs on these
pins are disabled when the logic probe function is
selected.
These inputs have CMOS logic switching thresholds.
For optimum performance as a logic probe, external
level shifters are recommended. See the applications
section for details.
4.1.2
LOGIC
4.1.5
BUZIN
The LOGIC input is used to activate the logic probe
function. When connected to V DD , the TC820 will enter
the Logic Probe mode. The LCD will show "OL" and all
decimal points will be off. The decimal point inputs
directly control "high" and "low" display annunciators.
This input controls the TC820 on-chip buzzer driver.
Connecting BUZIN to V DD will turn the buzzer on.
There is an external pull-down to DGND. BUZIN can be
used with external circuitry to provide additional
functions, such as a fast, audible continuity indication.
When LOGIC is unconnected, or connected to DGND,
the TC820 will perform analog-to-digital or frequency
4.2
Additional Features
measurements, as selected by the FREQ/VOLTS
input. The LOGIC input has an internal 5 μA pull-down
to DGND.
The TC820 is available in 40-pin and 44-pin packages.
Several additional features are available in the 44-pin
package.
4.1.3
RANGE/FREQ
The function of this dual purpose pin is determined by
the FREQ/VOLTS input. When FREQ/VOLTS is
connected to V DD , RANGE/FREQ is the input for the
frequency counter function. Pulses at this input are
counted with a time-base equal to F OSC /40,000. Since
this input has CMOS input levels (V DD – 1.5V and
DGND +1.5V), an external buffer is recommended.
? 2007 Microchip Technology Inc.
DS21476C-page 15
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