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TC815 데이터시트(PDF) 1 Page - Microchip Technology |
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TC815 데이터시트(HTML) 1 Page - Microchip Technology |
1 / 26 page © 2002 Microchip Technology Inc. DS21474B-page 1 TC815 Features • Auto-Range Operation for AC and DC Voltage and Resistance Measurements - Two User Selected AC/DC Current Ranges 20mA and 200mA • 22 Operating Ranges - 9 DC/AC Voltage - 4 AC/DC Current - 9 Resistance and Low Power Ohms • Display HOLD Function • 3-1/2 Digit Resolution in Auto-Range Mode: - 1/2000 • Extended Resolution in Manual Mode: 1/3000 • Memory Mode for Relative Measurements: -±5% F.S. • Internal AC to DC Conversion Op Amp • Triplex LCD Drive for Decimal Points, Digits and Annunciators • Continuity Detection and Piezoelectric Transducer Driver • Compact Surface Mounted 64-pin Plastic Flat Package • Low Drift Internal Reference: 75ppm/°C • 9V Battery Operation: 10mW • Low Battery Detection and LCD Annunciator Device Selection Table General Description The TC815 is a 3-1/2 digit integrating analog-to-digital converter with triplex LCD display drive and automatic ranging. A display hold function is on-chip. Input volt- age/ohm attenuators ranging from 1 to 1/10,000 are automatically selected. Five full scale ranges are pro- vided. The CMOS TC815 contains all the logic and analog switches needed to manufacture an auto- ranging instrument for ohms and voltage measure- ments. User selected 20mA and 200mA current ranges are available. Full scale range and decimal point LCD annunciators are automatically set in auto-range oper- ation. Auto-range operation is available during ohms (high and low power ohms) and voltage (AC and DC) measurements, eliminating expensive range switches in hand-held DMM designs. The auto-range feature may be bypassed allowing decimal point selection and input attenuator selection control through a single line input. Expensive rotary switches are not required. During Manual mode operation, resolution is extended to 3000 counts full scale. The extended range opera- tion is indicated by a flashing 1 MSD. The extended resolution is also available during 200k Ω and 2000V full scale auto-range operation. The Memory mode subtracts a reading, up to ±5% of full scale from subsequent measurements. Typical applications involve probe resistance compensation for resistance measurements, tolerance measurements, and tare weight measurements. The TC815 includes an AC to DC converter for AC measurements. Only external diodes/resistors/ capacitors are required. A complete LCD annunciator set describes the TC815 meter function and measurement range during ohms, voltage and current operation. AC measurements are indicated as well as auto-range operation. A low battery detection circuit also sets the low battery display annunciator. The triplex LCD display drive levels may be set and temperature compensation applied via the VDISP pin. With HOLD low, the display is not updated. A HOLD mode LCD annunciator is activated. The “low ohms” measurement option allows in-circuit resistance measurements by preventing semiconduc- tor junctions from being forward biased. Part Number Package Operating Temperature Range TC815CBU 64-Pin PQFP 0 °Cto +70°C 3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function |
유사한 부품 번호 - TC815 |
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유사한 설명 - TC815 |
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