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AD7416ARZ-REEL7 Folha de dados(PDF) 4 Page - Analog Devices |
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AD7416ARZ-REEL7 Folha de dados(HTML) 4 Page - Analog Devices |
4 / 20 page REV. G –4– AD7416/AD7417/AD7418 AD7417 PIN FUNCTION DESCRIPTION Pin No. Mnemonic Description 1, 16 NC No Connection. Do not connect anything to this pin. 2 SDA Digital I/O. Serial bus bidirectional data. Push-pull output. 3 SCL Digital Input. Serial bus clock. 4 OTI This is a logic output. The overtemperature indicator (OTI) is set if the result of a conversion on Channel 0 (temperature sensor) is greater than an 8-bit word in the overtemperature register (OTR). The signal is reset at the end of a serial read operation. Open-drain output. 5 REFIN Reference Input. An external 2.5 V reference can be connected to the AD7417 at this pin. To enable the on-chip reference, the REFIN pin should be tied to GND. If an external reference is connected to the AD7417, the internal reference will shut down. 6GND Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry. 7–10 AIN1 to AIN4 Analog Input Channels. The AD7417 has four analog input channels. The input channels are single-ended with respect to GND. The input channels can convert voltage signals in the range 0 V to VREF. A chan- nel is selected by writing to the configuration register of the AD7417. (See Control Byte section.) 11 A2 Digital Input. The highest programmable bit of the serial bus address. 12 A1 Digital Input. The middle programmable bit of the serial bus address. 13 A0 Digital Input. The lowest programmable bit of the serial bus address. 14 VDD Positive Supply Voltage, 2.7 V to 5.5 V. 15 CONVST Logic Input Signal. Convert start signal. The rising edge of this signal fully powers up the part. The power-up time for the part is 4 µs. If the CONVST pulse is greater than 4 µs, the falling edge of CONVST places the track-and-hold mode into hold mode and initiates a conversion. If the pulse is less than 4 µs, an internal timer ensures that the track-and-hold does not go into hold and conversion is not initiated until the power-up time has elapsed. The track-and-hold goes into track mode again at the end of con- version. (See Operating Mode section.) AD7417 PIN CONFIGURATION SOIC/TSSOP TOP VIEW (Not to Scale) NC = NO CONNECT NC SDA SCL OTI REFIN GND AIN1 AIN2 NC CONVST VDD A0 A1 A2 AIN4 AIN3 AD7417 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 |
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