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AD7851AR Datasheet(PDF) 11 Page - Analog Devices |
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AD7851AR Datasheet(HTML) 11 Page - Analog Devices |
11 / 36 page –11– REV. A AD7851 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 6. Flowchart for Reading the Status Register MSB ZERO BUSY ZERO ZERO ZERO ZERO PMGT1 PMGT0 RDSLT1 RDSLT0 2/3 MODE X CALMD CALSLT1 CALSLT0 STCAL LSB Status Register Bit Function Description Bit Mnemonic Comment 15 ZERO This bit is always 0. 14 BUSY Conversion/Calibration Busy Bit. When this bit is 1, this indicates that there is a conversion or calibration in progress. When this bit is 0, there is no conversion or calibration in progress. 13 ZERO These four bits are always 0. 12 ZERO 11 ZERO 10 ZERO 9 PMGT1 Power Management Bits. These bits along with the SLEEP pin will 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 indicating it is the status register that is being read. See Table II. 6 ONE 52/3 MODE Interface Mode Select Bit. With this bit 0, the device is in Interface Mode 2. With this bit 1, the device is in Interface Mode 1. This bit is reset to 0 after every read cycle. 4 X Don’t care bit. 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 III). 2 CALSLT1 Calibration Selection Bits and Start Calibration Bit. The STCAL bit is read as a 1 if a calibration is in 1 CALSLT0 progress and as a 0 if there is no calibration in progress. The CALSLT1 and CALSLT0 bits indicate 0 STCAL which of the calibration registers are addressed for reading and writing (see section on the Calibration Registers for more details). |
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