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TC835CBU Datasheet(PDF) 6 Page - Microchip Technology |
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TC835CBU Datasheet(HTML) 6 Page - Microchip Technology |
6 / 24 page TC835 DS21478B-page 6 © 2002 Microchip Technology Inc. 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin Number 28-Pin PDIP Symbol Description 1 V- Negative power supply input. 2 REF IN External reference input. 3 ANALOG COMMON Reference point for REF IN. 4 INT OUT Integrator output. Integrator capacitor connection. 5 AZ IN Auto zero input. Auto zero capacitor connection. 6 BUFF OUT Analog input buffer output. Integrator resistor connection. 7CREF- Reference capacitor input. Reference capacitor negative connection. 8CREF+ Reference capacitor input. Reference capacitor positive connection. 9 -INPUT Analog input. Analog input negative connection. 10 +INPUT Analog input. Analog input positive connection. 11 V+ Positive power supply input. 12 D5 Digit drive output. Most Significant Digit (MSD) 13 B1 Binary Coded Decimal (BCD) output. Least Significant Bit (LSB) 14 B2 BCD output. 15 B4 BCD output. 16 B8 BCD output. Most Significant Bit (MSB) 17 D4 Digit drive output. 18 D3 Digit drive output. 19 D2 Digit drive output. 20 D1 Digit drive output. Least Significant Digit (LSD) 21 BUSY Busy output. At the beginning of the signal-integration phase, BUSY goes High and remains High until the first clock pulse after the integrator zero crossing. 22 CLOCK IN Clock input. Conversion clock connection. 23 POLARITY Polarity output. A positive input is indicated by a logic High output. The polarity output is valid at the beginning of the reference integrate phase and remains valid until determined during the next conversion. 24 DGND Digital logic reference input. 25 RUN/HOLD Run / Hold input. When at a logic High, conversions are performed continuously. A logic Low holds the current data as long as the Low condition exists. 26 STROBE Strobe output. The STROBE output pulses low in the center of the digit drive outputs. 27 OVERRANGE Over range output. A logic High indicates that the analog input exceeds the full scale input range. 28 UNDERRANGE Under range output. A logic High indicates that the analog input is less than 9% of the full scale input range. |
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