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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TC820CLW Fiches technique(PDF) 5 Page - TelCom Semiconductor, Inc |
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TC820CLW Fiches technique(HTML) 5 Page - TelCom Semiconductor, Inc |
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5 / 22 page  3-153 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 PIN DESCRIPTION Pin No. Pin No. (40-Pin (44-Pin Flat Package) Package) 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 µA 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 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 µA pull-down 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 µA pull-down 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 µA pull-down 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 µA pull-down 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. TC820 3-3/4 A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE |
Numéro de pièce similaire - TC820CLW |
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Description similaire - TC820CLW |
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