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AD7851AR Datasheet(PDF) 11 Page - Analog Devices

No. de pieza AD7851AR
Descripción Electrónicos  14-Bit 333 kSPS Serial A/D Converter
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AD7851AR Datasheet(HTML) 11 Page - Analog Devices

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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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