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AD7859AS Folha de dados(PDF) 11 Page - Analog Devices |
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AD7859AS Folha de dados(HTML) 11 Page - Analog Devices |
11 / 28 page AD7859/AD7859L REV. A –11– STATUS REGISTER The arrangement of the status register is shown below. The status register is a read-only register and contains 16 bits of data. The status register is selected by first writing to the control register and putting two 1s in RDSLT1 and RDSLT0. The function of the bits in the status register are described below. The power-up status of all bits is 0. WRITE TO CONTROL REGISTER SETTING RDSLT0 = RDSLT1 = 1 READ STATUS REGISTER START Figure 4. Flowchart for Reading the Status Register MSB ZERO ZERO SGL/DIFF CHSLT2 CHSLT1 CHSLT0 PMGT1 PMGT0 ONE ONE AMODE BUSY CALMD CALSLT1 CALSLT0 STCAL LSB STATUS REGISTER BIT FUNCTION DESCRIPTION Bit Mnemonic Comment 15 ZERO These two bits are always 0. 14 ZERO 13 SGL/DIFF Single/Differential Bit. 12 CHSLT2 Channel Selection Bits. These bits, in conjunction with the SGL/DIFF bit, determine which channel has 11 CHSLT1 been selected for conversion. Please refer to Table IIIa and Table IIIb. 10 CHSLT0 9 PMGT1 Power Management Bits. These bits along with the SLEEP pin indicate if the part is in a power-down 8 PMGT0 mode or not. See Table VI in Power-Down Section for description. 7 ONE Both these bits are always 1. 6 ONE 5 AMODE Analog Mode Bit. This bit is used along with SGL/DIFF and CHSLT2 – CHSLT0 to determine the AIN(+) and AIN(–) inputs to the track and hold circuitry and the analog conversion mode (unipolar or bi- polar). Please see Table III for details. 4 BUSY Conversion/Calibration BUSY Bit. When this bit is a 1, there is a conversion or a calibration in progress. When this bit is a zero, there is no conversion or calibration in progress. 3 CALMD Calibration Mode Bit. A 0 in this bit indicates a self-calibration is selected, and a 1 in this bit indicates a system calibration is selected (see Table IV). 2 CALSLT1 Calibration Selection Bits. The CALSLT1 and CALSLT0 bits indicate which of the calibration 1 CALSLT0 registers are addressed for reading and writing (see section on the Calibration Registers for more details). 0 STCAL Start Calibration Bit. The STCAL bit is a 1 if a calibration is in progress and a 0 if there is no calibration in progress. |
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