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TC3400 데이터시트(PDF) 5 Page - Microchip Technology |
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TC3400 데이터시트(HTML) 5 Page - Microchip Technology |
5 / 16 page © 2002 Microchip Technology Inc. DS21409B-page 5 TC3400 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin SOIC) (8-Pin PDIP) Symbol Description 1 IN+ Analog Input. This is the positive terminal of a true differential input consisting of IN+ and IN-. VIN1 = (IN+ – IN-). See Section 1.0 Electrical Characteristics. 2 IN- Analog Input. This is the negative terminal of a true differential input consisting of IN+ and IN-. VIN = (IN+ – IN-) IN- can swing to, but not below, ground. 3REFIN Analog Input. The converter’s reference voltage is the differential between this pin and ground times two. It maybetieddirectlytoREFOUT or scaled using a resistor divider. Any user supplied reference voltagelessthan1.25V maybeusedinplace of REFOUT. 4 GND Ground Terminal. 5REFOUT Analog Output. The internal reference connects to this pin. It may be scaled externally, if desired, and tied to the REFIN input to provide the converter’s reference voltage. Care must be taken in connecting external circuitry to this pin. 6 SDAT Digital Output (push-pull). This is the microPort™ serial data output. SDAT is driven low while the TC3400 is converting data, effectively providing a “busy” signal. After the conversion is complete, every high to low transition on the SCLK pin puts a bit from the resulting data word on the SDAT pin (from MSB to LSB). 7 SCLK Digital Input. This is the microPort™ serial clock input. The TC3400 comes out of sleep mode and a conversion cycle begins when this pin is driven low. After the conversion starts, each additional falling edge (uptosix) detected onSCLK for t4 seconds reduces the A/D resolution by one bit. When the conversion is complete, the data word can be shifted out on the SDAT pin by clocking the SCLK pin. 8VDD Power Supply Input. |
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