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TC3404 Scheda tecnica(PDF) 5 Page - Microchip Technology |
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TC3404 Scheda tecnica(HTML) 5 Page - Microchip Technology |
5 / 16 page © 2002 Microchip Technology Inc. DS21413B-page 5 TC3404 2.0 PIN DESCRIPTIONS Thedescriptionsof the pins arelistedinTable2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (16-Pin PDIP (16-Pin QSOP) Symbol Description 1 IN1+ Analog Input. This is the positive terminal of a true differential input with the negative input tied internally to GND. See Section 1.0, Electrical Characteristics. 2 IN2+ Analog Input. This is the positive terminal of a true differential input with the negative input tied internally to GND. See Section 1.0, Electrical Characteristics. 3 IN3+ Analog Input. This is the positive terminal of a true differential input consisting of IN3+ and IN3-. VIN3 = (IN3+ – IN3-). See Section 1.0, Electrical Characteristics. 4 IN3- Analog Input. This is the negative terminal of a true differential input consisting of IN3+ and IN3-. VIN3 = (IN3+ – IN3-) IN3- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics. 5 IN4+ Analog Input. This is the positive terminal of a true differential input consisting of IN4+ and IN4-. VIN4 = (IN4+ – IN4-). See Section 1.0, Electrical Characteristics. 6 IN4- Analog Input. This is the negative terminal of a true differential input consisting of IN4+ and IN4-. VIN4 = (IN4+ – IN4-) IN4- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics. 7REFIN Analog Input. The converter’s reference voltage is the differential between this pin and ground times two. It may be tied directly to REFOUT or scaled using a resistor divider. Any user supplied reference voltage less than 1.25 may be used in place of REFOUT. 8 GND Ground Terminal. 9REFOUT Analog Output. The internal reference connects to this pin. It may be scaled externally, andtiedtothe REFIN input to provide the converter’s reference voltage. Care must be taken in connecting external circuitry to this pin. This pin is in a high impedance state during Sleep mode. See Section 1.0, Electrical Characteristics. 10 SDAT Digital Output (push-pull). This is the microPort™ serial data output. SDAT is driven low while the TC3404 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 resultingdatawordon the SDAT pin(from MSB toLSB). 11 PFO Digital Output (open drain). This is the output of the internal threshold detector. When PFI is less than the internal reference, PFO is driven low. 12 PFI Analog Input. This is the positive input to an internal comparator used as a threshold detector. The negative input is tied to an internal reference. 13 A1 Digital Input. Controls analog multiplexer in conjunction with A0 to select one of the four Input channels. This address is latched at the falling edge of the SCLK, which starts an A/D conversion. A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4. 14 A0 Digital Input. Controls analog multiplexer in conjunction with A1 to select one of four Input channels. This address is latched at the falling edge of the SCLK, which starts an A/D conversion. A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4. 15 SCLK Digital Input. This is the microPort™ serial clock input. The TC3404 comes out of Sleep mode and a conversion cycle begins when this pin is driven low. After the conversion starts, each additional falling edge (up to six) detected on SCLK 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. 16 VDD Power Supply Input. |
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