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| 型号： | TC820C/PL |
| 元件分类： | ADC |
| 英文描述： | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
| 封装： | 0.600 INCH, PLASTIC, DIP-40 |
| 文件页数： | 7/34页 |
| 文件大小： | 435K |
| 代理商： | TC820C/PL |
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2007 Microchip Technology Inc.
DS21476C-page 15
TC820
4.0
FUNCTION CONTROL INPUTS
PIN
4.1
Functional Description
The TC820 Operating modes are selected with the
function control inputs. See the control input truth,
Table 4-1. The high logic threshold is
≥ V
DD – 1.5V and
the low logic level is
≤ DGND +1.5V.
TABLE 4-1:
TC820 CONTROL INPUT
TRUTH TABLE
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 VDD, 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 A pull-down to DGND.
4.1.2
LOGIC
The LOGIC input is used to activate the logic probe
function. When connected to VDD, 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.
When LOGIC is unconnected, or connected to DGND,
the TC820 will perform analog-to-digital or frequency
measurements, as selected by the FREQ/VOLTS
input. The LOGIC input has an internal 5 A pull-down
to DGND.
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 VDD, RANGE/FREQ is the input for the
frequency counter function. Pulses at this input are
counted with a time-base equal to FOSC/40,000. Since
this input has CMOS input levels (VDD – 1.5V and
DGND +1.5V), an external buffer is recommended.
When the TC820 analog-to-digital converter function is
selected, connecting RANGE/FREQ to VDD 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.
4.1.4
DP0/LO, DP1/HI
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
LCD decimal points. See the decimal point truth,
Table 4-1. These inputs have internal 5 A pull-downs
to DGND when the Voltage/Frequency Measurement
mode is active.
TABLE 4-1:
TC820 DECIMAL POINT
TRUTH TABLE
Connecting the LOGIC input to VDD places the TC820
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
VDD, the "high" annunciator will turn on. When DP0/LO
is connected to VDD, 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.
4.1.5
BUZIN
This input controls the TC820 on-chip buzzer driver.
Connecting BUZIN to VDD 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.
4.2
Additional Features
The TC820 is available in 40-pin and 44-pin packages.
Several additional features are available in the 44-pin
package.
Logic Input
TC820 Function
FREQ/
VOLTS
RANGE/
FREQ
LOGIC
X
1
Logic Probe
0
A/D Converter,
VFULL SCALE = 2 x VREF
0
1
0
A/D Converter,
VFULL SCALE = 20 x VREF
1
Frequency
Counter
Input
0
Frequency Counter
Note
1:
Logic "0" = DGND
2:
Logic "1" = VDD-
DP1
DP0
LCD
0
3999
0
1
399.9
1
0
39.99
1
3.999
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