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AD7747 Scheda tecnica(PDF) 16 Page - Analog Devices |
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AD7747 Scheda tecnica(HTML) 16 Page - Analog Devices |
16 / 29 page AD7747 Rev. 0 | Page 15 of 28 STATUS REGISTER Address Pointer 0x00, Read Only, Default Value 0x07 This register indicates the status of the converter. The status register can be read via the 2-wire serial interface to query a finished conversion. The RDY pin reflects the status of the RDY bit. Therefore, the RDY pin high-to-low transition can be used as an alternative indication of the finished conversion. Table 9. Status Register Bit Map Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Mnemonic – – – – – RDY RDYVT RDYCAP Default 0 0 0 0 0 1 1 1 Table 10. Bit Mnemonic Description 7 to 3 – Not used, always read 0. 2 RDY RDY = 0 indicates that conversion on the enabled channel(s) is complete and new unread data is available. If both capacitive and voltage/temperature channels are enabled, the RDY bit is changed to 0 after conversion on both channels is complete. The RDY bit returns to 1 either when data is read or prior to finishing the next conversion. If, for example, only the capacitive channel is enabled, then the RDY bit reflects the RDYCAP bit. 1 RDYVT RDYVT = 0 indicates that a conversion on the voltage/temperature channel is complete and new unread data is available. 0 RDYCAP RDYCAP = 0 indicates that a conversion on the capacitive channel is complete and new unread data is available. CAP DATA REGISTER 24 Bits, Address Pointer 0x01, 0x02, 0x03, Read-Only, Default Value 0x000000 This register contains the capacitive channel output data. The register is updated after finished conversion on the capacitive channel, with one exception: When the serial interface read operation from the Cap Data register is in progress, the data register is not updated and the new capacitance conversion result is lost. The stop condition on the serial interface is considered to be the end of the read operation. Therefore, to prevent data corruption, all three bytes of the data register should be read sequentially using the register address pointer auto-increment feature of the serial interface. To prevent losing some of the results, the Cap Data register should be read before the next conversion on the capacitive channel is finished. The 0x000000 code represents negative full scale (−8.192 pF), the 0x800000 code represents zero scale (0 pF), and the 0xFFFFFF code represents positive full scale (+8.192 pF). VT DATA REGISTER 24 Bits, Address Pointer 0x04, 0x05, 0x06, Read-Only, Default Value 0x000000 This register contains the voltage/temperature channel output data. The register is updated after finished conversion on the voltage channel or temperature channel, with one exception: When the serial interface read operation from the VT Data register is in progress, the data register is not updated and the new voltage/temperature conversion result is lost. The stop condition on the serial interface is considered to be the end of the read operation. Therefore, to prevent data corruption, all three bytes of the data register should be read sequentially using the register address pointer auto-increment feature of the serial interface. For voltage input, Code 0 represents negative full scale (−VREF), the 0x800000 code represents zero scale (0 V), and the 0xFFFFFF code represents positive full scale (+VREF). To prevent losing some of the results, the VT Data register should be read before the next conversion on the voltage/ temperature channel is complete. For the temperature sensor, the temperature can be calculated from code using the following equation: Temperature (°C) = (Code/2048) − 4096 |
Codice articolo simile - AD7747_17 |
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Descrizione simile - AD7747_17 |
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