EVAL-AD7854CB Просмотр технического описания (PDF) - Analog Devices

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EVAL-AD7854CB

3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADC

Analog Devices 

AD7854/AD7854L

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 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

ZERO

ZERO

ZERO

ZERO PMGT1 PMGT0

ONE

ONE

AMODE

BUSY

CALMD CALSLT1 CALSLT0

STCAL

LSB

Bit Mnemonic

15 ZERO

14 ZERO

13 ZERO

12 ZERO

11 ZERO

10 ZERO

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 six bits are always 0.

Power Management Bits. These bits will 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. When this bit is a 0, the device is set up for the unipolar analog input range. When this

bit is a 1, the device is set up for the bipolar analog input range.

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.

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).

Calibration Selection Bits and Start Calibration Bit. The STCAL bit is read as a 1 if a calibration is in

progress and as a 0 if there is no calibration in progress. 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).

–10–

REV. B

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