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TC820CLW датащи(PDF) 4 Page - TelCom Semiconductor, Inc |
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TC820CLW датащи(HTML) 4 Page - TelCom Semiconductor, Inc |
4 / 22 page 3-152 TELCOM SEMICONDUCTOR, INC. ELECTRICAL CHARACTERISTICS (Cont.) Symbol Parameter Test Conditions Min Typ Max Units Buzzer Frequency fOSC = 40kHz — 5 — kHz Counter Timebase Period fOSC = 40kHz — 1 — Second Low Battery Flag Voltage VDD to VSS 6.7 7 7.3 V VIL Input Low Voltage — — DGND + 1.5 V VIH Input High Voltage VDD – 1.5 — — V VOL Output Low Voltage, IL = 50µA — — DGND + 0.4 V UR, OR Outputs VOL Output High Voltage, IL = 50µAVDD – 1.5 — — V UR, OR Outputs Control Pin VIN = VDD —5 — µA Pull-Down Current PIN DESCRIPTION Pin No. Pin No. (40-Pin (44-Pin Flat Package) Package) Symbol Description 1 40 L-E4 LCD segment driver for L ("logic LOW"), polarity, and "e" segment of most significant digit (MSD). 2 41 AGD4 LCD segment drive for "a," "g," and "d" segments of MSD. 3 42 BC4P3 LCD segment drive for "b" and "c" segments of MSD and decimal point 3. 4 43 HFE3 LCD segment drive for H ("logic HIGH"), and "f" and "e" segments of third LSD. 5 44 AGD3 LCD segment drive for "a," "g," and "d" segments of third LSD. 6 1 BC3P2 LCD segment drive for "b" and "c" segments of third LSD and decimal point 2. 7 2 OFE2 LCD segment drive for "overrange," and "f" and "e" segments of second LSD. 8 3 AGD2 LCD segment drive for "a," "g," and "d" segments of second LSD. 9 4 BC2P1 LCD segment drive for "b " and "c" segments of second LSD and decimal point 1. 10 5 PKFE1 LCD segment drive for "hold peak reading," and "f" and "e" segments of LSD. 11 6 AGD1 LCD segment drive for "a," "g," and "d" segments of LSD. 12 7 BC1BT LCD segment drive for "b" and "c" segments of LSD and "low battery." 13 8 BP3 LCD backplane #3. 14 9 BP2 LCD backplane #2. 15 10 BP1 LCD backplane #1. —11 VDISP Sets peak LCD drive signal: VPEAK = (VDD ) –VDISP. VDISP may also be used to compensate for temperature variation of LCD crystal threshold voltage. 16 12 DGND Internal logic digital ground, the logic "0" level. Nominally 4.7V below VDD. 17 13 ANNUNC Square-wave output at the backplane frequency, synchronized to BP1. ANNUNC can be used to control display annunciators. Connecting an LCD segment to ANNUNC turns it on; connecting it to its backplane turns it off. 18 14 LOGIC Logic mode control input. When connected to VDD, the converter is in logic mode. The LCD displays "OL" and the decimal point inputs control the HIGH and LOW annunciators. When the "low" annunciator is on, the buzzer will also be on. When unconnected or connected to DGND, the TC820 is in the voltage/frequency measurement mode. This pin has a 5 µA internal pull-down to DGND. 19 15 RANGE/ Dual-purpose input. In range mode, when connected to VDD, the integration time FREQ will be 200 counts instead of 2000 counts and the LCD will display the analog input divided by 10. (See text for limitation with TC820.) In frequency mode, this pin is the frequency input. A digital signal applied to this pin will be measured with a 1-second time base. There is an internal 5 µA pull-down to DGND. 3-3/4 A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE TC820 |
Аналогичный номер детали - TC820CLW |
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Аналогичное описание - TC820CLW |
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