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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7280A датащи(PDF) 9 Page - Analog Devices |
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AD7280A датащи(HTML) 9 Page - Analog Devices |
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9 / 48 page  AD7280A Rev. 0 | Page 9 of 48 Pin No. Mnemonic Description 21 CS Chip Select Input. The CS input is used to frame the input and output data on the SPI and daisy-chain interfaces. On the master AD7280A device, the CS input is supplied from the DSP/microprocessor. When the AD7280A acts as a slave in a daisy chain, this input should be connected to the CShi output of the AD7280A immediately below it in potential in the daisy chain. 22 SCLK Serial Clock Input. On the master AD7280A device, the SCLK input is supplied from the DSP/microprocessor. When the AD7280A acts as a slave in a daisy chain, this input should be connected to the SCLKhi output of the AD7280A immediately below it in potential in the daisy chain. 23 SDI Serial Data Input. Data to be written to the on-chip registers is provided on this input and is clocked into the AD7280A on the falling edge of the SCLK input. On the master AD7280A device, SDI is the data input of the SPI interface. When the AD7280A acts as a slave in a daisy chain, this input accepts data from the SDOhi output of the AD7280A immediately below it in potential in the daisy chain. 24 CNVST Convert Start Input. The conversion is initiated on the falling edge of CNVST. On the master AD7280A, the CNVST pulse is supplied from the DSP/microprocessor; this input can also be tied to DVCC and the conversion initiated through the serial interface. When the AD7280A acts as a slave in a daisy chain, this input should be connected to the CNVSThi output of the AD7280A immediately below it in potential in the daisy chain. 25 SDOlo Serial Data Output in Daisy-Chain Mode. On the master AD7280A device, this output should be connected to VSS either directly or through a pull-down, 1 kΩ resistor. When the AD7280A acts as a slave in a daisy chain, this output should be connected to the SDIhi input of the AD7280A immediately below it in potential in the daisy chain. 26 SDO Serial Data Output. The conversion output data or the register output data is supplied to this pin as a serial data stream. The bits are clocked out on the rising edge of the SCLK input; 32 SCLKs are required to access the data. On the master AD7280A device, the SDO output should be connected to the DSP/microprocessor. The SDO outputs of the remaining AD7280As in the daisy chain should be connected to VSS either directly or through a pull-down, 1 kΩ resistor. 27 ALERT Digital Output. This flag indicates cell or auxiliary ADC input overvoltage or undervoltage. The ALERT output of the master AD7280A should be connected to the DSP/microprocessor. The ALERT outputs of the remaining AD7280As in the daisy chain should be connected to VSS either directly or through a pull-down, 1 kΩ resistor. 28 ALERTlo Alert Output in Daisy-Chain Mode. On the master AD7280A, this output should be connected to VSS either directly or through a pull-down, 1 kΩ resistor. When the AD7280A acts as a slave in a daisy chain, this output should be connected to the ALERThi input of the AD7280A immediately below it in potential in the daisy chain. 29 VDRIVE Logic Power Supply Input. The voltage supplied at this pin determines the voltage at which the SPI interface operates. This pin should be decoupled to DGND. On the master AD7280A device, the voltage range on this pin is 2.7 V to 5.5 V. The VDRIVE voltage can be different from the voltage at AVCC and DVCC, but it should never exceed either by more than 0.3 V. The VDRIVE pin of the remaining AD7280As in the daisy chain should be connected to VREG. 30 AVCC Analog Supply Voltage for the ADC Core, 4.9 V to 5.5 V. The AVCC and DVCC voltages should ideally be at the same potential. For best performance, it is recommended that the AVCC and DVCC pins be shorted together to ensure that the voltage difference between them never exceeds 0.3 V, even on a transient basis. This supply should be decoupled to AGND. Place 100 nF decoupling capacitors on the AVCC pin. The AVCC supply pin should be connected to the VREG output. 31 AGND Analog Ground. This pin is the ground reference point for all analog circuitry on the AD7280A. This input should be at the same potential as the base of the series-connected battery cells. The AGND and DGND voltages should ideally be at the same potential and must not be more than 0.3 V apart, even on a transient basis. 32 AUXTERM Thermistor Termination Resistor Input. If this function is not required in the application, it is recommended that this pin be connected to VREG through a 10 kΩ resistor. 33 to 38 AUX6 to AUX1 Auxiliary, Single-Ended 5 V ADC Inputs. If any of these inputs is not required in the application, it is recommended that the pin be connected to VREG through a 10 kΩ resistor. 39 CREF Reference Capacitor. A 100 nF decoupling capacitor to REFGND should be placed on this pin. 40 VREF Reference Output, 2.5 V. The on-chip reference is available on this pin for use external to the AD7280A. A 1 μF decoupling capacitor to REFGND is recommended on this pin. 41 REFGND Reference Ground. This pin is the ground reference point for the internal band gap reference circuitry on the AD7280A. The REFGND voltage should be at the same potential as the AGND voltage. 42 ALERThi Alert Input in Daisy-Chain Mode. The alert signal from each AD7280A in the daisy chain is passed through the ALERTlo output and the ALERThi input of each AD7280A in the chain and is supplied to the DSP/micro- processor through the ALERT output of the master AD7280A. This input should be connected to the ALERTlo output of the AD7280A immediately above it in potential in the daisy chain. The AD7280A at the highest potential in the stack does not require an alert input; in this case, the pin should be connected to VDD through a 1 kΩ resistor. |
Аналогичный номер детали - AD7280A |
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Аналогичное описание - AD7280A |
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