EVAL-AD7859CB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7859CB' PDF : 28 Pages View PDF
AD7859/AD7859L
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.
START
WRITE TO CONTROL REGISTER
SETTING RDSLT0 = RDSLT1 = 1
MSB
ZERO
READ STATUS REGISTER
Figure 4. Flowchart for Reading the Status Register
ZERO SGL/DIFF CHSLT2 CHSLT1 CHSLT0 PMGT1 PMGT0
ONE
ONE
AMODE
BUSY
CALMD CALSLT1 CALSLT0
STCAL
LSB
Bit Mnemonic
15 ZERO
14 ZERO
13 SGL/DIFF
12 CHSLT2
11 CHSLT1
10 CHSLT0
9 PMGT1
8 PMGT0
7 ONE
6 ONE
5 AMODE
4 BUSY
3 CALMD
2 CALSLT1
1 CALSLT0
0 STCAL
STATUS REGISTER BIT FUNCTION DESCRIPTION
Comment
These two bits are always 0.
Single/Differential Bit.
Channel Selection Bits. These bits, in conjunction with the SGL/DIFF bit, determine which channel has
been selected for conversion. Please refer to Table IIIa and Table IIIb.
Power Management Bits. These bits along with the SLEEP pin indicate if the part is in a power-down
mode or not. See Table VI in Power-Down Section for description.
Both these bits are always 1.
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.
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.
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).
Calibration Selection Bits. The CALSLT1 and CALSLT0 bits indicate which of the calibration
registers are addressed for reading and writing (see section on the Calibration Registers for more details).
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.
REV. A
–11–
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