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参数资料
| 型号： | TC820CLW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 3/24页 |
| 文件大小： | 185K |
| 代理商： | TC820CLW |
11
TC820
3-3/4 A/D Converter with Frequency
Counter and Logic Probe
TC820-10 10/17/96
2001 Microchip Technology Inc.
DS21476A
tCOUNT =
Thus, the counter will operate with a 1-second time
base when a 40kHz oscillator is used. The frequency counter
accuracy is determined by the oscillator accuracy. For
accurate frequency measurements, a crystal oscillator is
recommended.
The frequency counter will automatically select the
proper range. Auto-range operation extends over four
decades, from 3.999kHz to 3.999mHz. Decimal points are
set automatically in the frequency mode (Figure 5).
The logic switching levels of the RANGE/FREQ input
are CMOS levels. For best counter operation, an external
buffer is recommended. See the applications section for
details.
Logic Probe
The TC820 can also function as a simple logic probe
(Figure 6). This mode is selected when the LOGIC input is
high. Two dual-purpose pins, which normally control the
decimal points, are used as logic inputs. Connecting either
input to a logic high level will turn on the corresponding
LCD annunciator. When the "low" annunciator is on the
buzzer will be on. As with the frequency counter input,
external level shifters/buffers are recommended for the
logic probe inputs.
fOSC
40,000
DATA LATCH, PEAK
HOLD REGISTER,
LCD DECODER/DRIVERS
OVERRANGE
DETECT
UNDERRANGE
DETECT
AUTO-RANGE
CONTROL
PROGRAMMABLE
DIVIDER
(
÷1, 10, 100, 1000)
CLOCK
OSCILLATOR
TO DECIMAL
POINT DRIVERS
FREQUENCY
INPUT
RANGE/
FREQ
÷20,000
FROM INTEGRATOR
OF A/D CONVERTER
COMPARATOR
LCD
3-3/4 DIGIT COUNTER
ENABLE
COUNT
OVERFLOW
A/D CONVERTER
FREQUENCY COUNTER
A/D CONVERTER/FREQUENCY
COUNTER SELECT
TC820
÷2
FREQ/
VOLTS
Figure 4. TC820 Counter Operation
When the logic probe function is selected while FREQ/
VOLTS is low (A/D mode), the ADC will remain in the auto-
zero mode. The LCD will read "OL" and all decimal points
will be off (Figure 7).
If the logic probe is active while FREQ/VOLTS is high
(counter mode), the frequency counter will continue to
operate. The display will read "OL" but the decimal points
will be visible. If the logic probe input is also connected to
the RANGE/FREQ input, bringing the LOGIC input low will
immediately display the frequency at the logic probe input.
Analog Pin Functional Description
Differential Signal Inputs (V
+
IN), (V
–
IN)
The TC820 is designed with true differential inputs,
and accepts input signals within the input stage common-
mode voltage (VCM) range. The typical range is VDD –1V to
VSS +1.5V. Common-mode voltages are removed from the
system when the TC820 operates from a battery or floating
power source (isolated from measured system) and VSS is
connected to analog common. (See Figure 8.)
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