參數(shù)資料
型號(hào)： TC820CKW
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PQFP44
封裝： PLASTIC, FP-44
文件頁(yè)數(shù)： 20/24頁(yè)
文件大?。?/td> 185K
代理商： TC820CKW
5
TC820
3-3/4 A/D Converter with Frequency
Counter and Logic Probe
TC820-10 10/17/96
2001 Microchip Technology Inc.
DS21476A
PIN DESCRIPTION
Pin No.
(40-Pin Plastic (44-Pin Flat
DIP Pkg.)
Plastic Pkg.) Symbol
Description
20
16
DP0/LO
Dual-purpose input. Decimal point select input for voltage measurements. In logic
mode, connecting this pin to VDD will turn on the "low" LCD segment. There is an
internal 5
A pulldown to DGND in volts mode only. Decimal point logic:
DP1
DP0
Decimal Point Selected
0
None
0
1
DP1
1
0
DP2
1
DP3
21
17
DP1/HI
Dual-purpose input. Decimal point select input for voltage measurements. In logic
mode, connecting this pin to VDD will turn on the "high" LCD segment. There is an
internal 5
A pulldown to DGND in volts mode only.
22
18
BUZOUT
Buzzer output. Audio frequency, 5kHz, output which drives a piezoelectric buzzer.
23
19
BUZIN
Buzzer control input. Connecting BUZIN to VDD turns the buzzer on. BUZIN is
logically ORed (internally) with the "logic level low" input. There is an internal 5
A
pulldown to DGND.
24
20
FREQ/
Voltage or frequency measurement select input. When unconnected, or connected
VOLTS
to DGND, the A/D converter function is active. When connected to VDD, the
frequency counter function is active. This pin has an internal 5
A pulldown
to DGND.
25
21
PKHOLD
Peak hold input. When connected to VDD, the converter will only update the display
if a new conversion value is greater than the preceding value. Thus, the peak
reading will be stored and held indefinitely. When unconnected, or connected to
DGND, the converter will operate normally. This pin has an internal 5
A pulldown
to DGND.
22
UR
Underrange output. This output will be HIGH when the digital reading is 380 counts
or less.
23
OR
Overrange output. This output will be HIGH when the analog signal input is greater
than full scale. The LCD will display "OL" when the input is overranged.
26
24
VSS
Negative supply connection. Connect to negative terminal of 9V battery.
27
25
COM
Analog circuit ground reference point. Nominally 3.3V below VDD.
28
26
C
+
REF
Positive connection for reference capacitor.
29
27
C
–
REF
Negative connection for reference capacitor.
30
28
V
+
REF
High differential reference input connection.
31
29
V
_
REF
Low differential reference input connection.
32
30
V
–
IN
Low analog input signal connection.
33
31
V
+
IN
High analog input signal connection.
34
32
VBUFF
Buffer output. Connect to integration resistor.
35
33
CAZ
Auto-zero capacitor connection.
36
34
VINT
Integrator output. Connect to integration capacitor.
35
EOC/
Bidirectional pin. Pulses low (i.e., from VDD to DGND) at the end of each
HOLD
conversion. If connected to VDD, conversions will continue, but the display is not
updated.
37
36
OSC1
Crystal oscillator (input) connection.
38
37
OSC2
Crystal oscillator (output) connection.
39
38
OSC3
RC oscillator connection.
40
39
VDD
Positive power supply connection, typically 9V.
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