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AD7747 データシート(PDF) 8 Page - Analog Devices |
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AD7747 データシート(HTML) 8 Page - Analog Devices |
8 / 29 page AD7747 Rev. 0 | Page 7 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SCL RDY SHLD TST REFIN(+) CIN1(–) REFIN(–) CIN1(+) 1 2 3 4 5 7 6 8 SDA NC VDD GND VIN(–) VIN(+) NC NC 16 15 14 13 12 11 10 9 AD7747 TOP VIEW (Not to Scale) NC = NO CONNECT Figure 3. Pin Configuration 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 SHLD Capacitive Input Active AC Shielding. To eliminate the CIN parasitic capacitance to ground, the SHLD signal can be used for shielding the connection between the sensor and CIN. If not used, this pin should be left as an open circuit. 4 TST This pin must be left as an open circuit for proper operation. 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. The measured capacitance is connected between the CIN1(−) pin and GND. If not used, this pin should be left as an open circuit. 8 CIN1(+) CDC Positive Capacitive Input. The measured capacitance is connected between the CIN1(+) pin and GND. If not used, this pin should be left as an open circuit. 9, 10 NC Not Connected. These pins should be left as an open circuit. 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. |
同様の部品番号 - AD7747_17 |
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同様の説明 - AD7747_17 |
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