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參數(shù)資料
| 型號(hào)： | TC820CPL |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3-3/4 Digit A/D Converter with Frequency Counter and Logic Probe |
| 中文描述： | 3-3/4位A / D轉(zhuǎn)換頻率計(jì)數(shù)器和邏輯轉(zhuǎn)換的探討 |
| 文件頁數(shù)： | 5/22頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TC820CPL |
3-153
TELCOM SEMICONDUCTOR, INC.
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PIN DESCRIPTION
Pin No.
(40-Pin
Package)
Pin No.
(44-Pin Flat
Package)
Symbol
Description
20
16
DP0/LO
Dual-purpose input. Decimal point select input for voltage measurements. In logic
mode, connecting this pin to V
DD
will turn on the "low" LCD segment. There is an
internal 5
μ
A pull-down to DGND in volts mode only. Decimal point logic:
DP1
DP0
Decimal Point Selected
0
0
None
0
1
DP1
1
0
DP2
1
1
DP3
Dual-purpose input. Decimal point select input for voltage measurements. In logic
mode, connecting this pin to V
DD
will turn on the "high" LCD segment. There is an
internal 5
μ
A pull-down to DGND in volts mode only.
Buzzer output. Audio frequency, 5kHz, output which drives a piezoelectric buzzer.
Buzzer control input. Connecting BUZIN to V
DD
turns the buzzer on. BUZIN is
logically ORed (internally) with the "logic level low" input. There is an internal 5
μ
A
pull-down to DGND.
Voltage or frequency measurement select input. When unconnected, or connected
to DGND, the A/D converter function is active. When connected to V
DD
, the
frequency counter function is active. This pin has an internal 5
μ
A pull-down
to DGND.
Peak hold input. When connected to V
DD
, 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
μ
A pull-down
to DGND.
Underrange output. This output will be HIGH when the digital reading is 380 counts
or less.
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.
Negative supply connection. Connect to negative terminal of 9V battery.
Analog circuit ground reference point. Nominally 3.3V below V
DD
.
Positive connection for reference capacitor.
Negative connection for reference capacitor.
High differential reference input connection.
Low differential reference input connection.
Low analog input signal connection.
High analog input signal connection.
Buffer output. Connect to integration resistor.
Auto-zero capacitor connection.
Integrator output. Connect to integration capacitor.
Bidirectional pin. Pulses low (i.e., from V
DD
to DGND) at the end of each
conversion. If connected to V
DD
, conversions will continue, but the display is not
updated.
Crystal oscillator (input) connection.
Crystal oscillator (output) connection.
RC oscillator connection.
Positive power supply connection, typically 9V.
21
17
DP1/HI
22
23
18
19
BUZOUT
BUZIN
24
20
FREQ/
VOLTS
25
21
PKHOLD
22
UR
23
OR
26
27
28
29
30
31
32
33
34
35
36
24
25
26
27
28
29
30
31
32
33
34
35
V
SS
COM
C
+
C
–
V
+
V
–
V
–
IN
V
+
V
BUFF
C
AZ
V
INT
EOC/
HOLD
37
38
39
40
36
37
38
39
OSC1
OSC2
OSC3
V
DD
TC820
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
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