EVAL-AD7851CB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7851CB' PDF : 36 Pages View PDF
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 is described below. The power-up status of all bits is 0.
START
WRITE TO CONTROL REGISTER
SETTING RDSLT0 = RDSLT1 = 1
READ STATUS REGISTER
Figure 6. Flowchart for Reading the Status Register
MSB
ZERO
RDSLT1
BUSY
ZERO
RDSLT0 2/3 MODE
ZERO
X
ZERO
ZERO PMGT1
CALMD CALSLT1 CALSLT0
PMGT0
STCAL
LSB
Status Register Bit Function Descriptions
Bit No. 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 whether the part is in a power-
8
PMGT0 down mode. (See Table VI in the Power-Down Options section for description.)
7
RDSLT1 Both these bits are always 1 indicating it is the status register that is being read. (See Table II.)
6
RDSLT0
5
2/3 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 self-calibration is selected, and 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 which
0
STCAL
of the calibration registers are addressed for reading and writing (see the Calibration Registers section for
more details)
–12–
REV. B
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