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AD7745ARUZ-REEL7 Folha de dados(PDF) 7 Page - Analog Devices |
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AD7745ARUZ-REEL7 Folha de dados(HTML) 7 Page - Analog Devices |
7 / 28 page AD7745/AD7746 Rev. 0| Page 7 of 28 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 AD7745 TOP VIEW (Not to Scale) SCL EXCA EXCB REFIN(+) REFIN(–) CIN1(–) CIN1(+) RDY SDA VDD GND VIN(–) VIN(+) NC NC NC NC = NO CONNECT Figure 4. AD7745 Pin Configuration (16-Lead TSSOP) 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 AD7746 TOP VIEW (Not to Scale) SCL EXCA EXCB REFIN(+) REFIN(–) CIN1(–) CIN1(+) RDY SDA VDD GND VIN(–) VIN(+) CIN2(–) CIN2(+) NC NC = NO CONNECT Figure 5. AD7746 Pin Configuration (16-Lead TSSOP) Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 SCL Serial Interface Clock Input. Connects to the master clock line. Requires pull-up resistor if not already provided in the system. 2 RDY Logic Output. A falling edge on this output indicates that a conversion on enabled channel(s) has been finished and the new data is available. Alternatively, the status register can be read via the 2-wire serial interface and the relevant bit(s) decoded to query the finished conversion. If not used, this pin should be left as an open circuit. 3, 4 EXCA, EXCB CDC Excitation Outputs. The measured capacitance is connected between one of the EXC pins and one of the CIN pins. If not used, these pins should be left as an open circuit. 5, 6 REFIN(+), REFIN(–) Differential Voltage Reference Input for the Voltage Channel (ADC). Alternatively, the on-chip internal reference can be used for the voltage channel. These reference input pins are not used for conversion on capacitive channel(s) (CDC). If not used, these pins can be left as an open circuit or connected to GND. 7 CIN1(–) CDC Negative Capacitive Input in Differential Mode. This pin is internally disconnected in single-ended CDC configuration. If not used, this pin can be left as an open circuit or connected to GND. 8 CIN1(+) CDC Capacitive Input (in Single-Ended Mode) or Positive Capacitive Input (in Differential Mode). The measured capacitance is connected between one of the EXC pins and one of the CIN pins. If not used, this pin can be left as an open circuit or connected to GND. 9, 10 (AD7745) NC Not Connected. This pin should be left as an open circuit. 9 (AD7746) CIN2(+) CDC Second Capacitive Input (in Single-Ended Mode) or Positive Capacitive Input (in Differential Mode). If not used, this pin can be left open circuit or connected to GND. 10 (AD7746) CIN2(–) CDC Negative Capacitive Input in Differential Mode. This pin is internally disconnected in a single-ended CDC configuration. If not used, this pin can be left as an open circuit or connected to GND. 11, 12 VIN(+), VIN(–) Differential Voltage Input for the Voltage Channel (ADC). These pins are also used to connect an external temperature sensing diode. If not used, these pins can be left as an open circuit or connected to GND. 13 GND Ground Pin. 14 VDD Power Supply Voltage. This pin should be decoupled to GND, using a low impedance capacitor, for example in combination with a 10 µF tantalum and a 0.1 µF multilayer ceramic. 15 NC Not Connected. This pin should be left as an open circuit. 16 SDA Serial Interface Bidirectional Data. Connects to the master data line. Requires a pull-up resistor if not provided elsewhere in the system. |
Nº de peça semelhante - AD7745ARUZ-REEL7 |
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Descrição semelhante - AD7745ARUZ-REEL7 |
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