EVAL-AD7851CB(RevA) Просмотр технического описания (PDF) - Analog Devices

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EVAL-AD7851CB
(Rev.:RevA)

14-Bit 333 kSPS Serial A/D Converter

Analog Devices 

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.

START

WRITE TO CONTROL REGISTER

SETTING RDSLT0 = RDSLT1 = 1

READ STATUS REGISTER

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

Bit Mnemonic

15 ZERO

14 BUSY

13 ZERO

12 ZERO

11 ZERO

10 ZERO

9 PMGT1

8 PMGT0

7 ONE

6 ONE

5 2/3 MODE

4X

3 CALMD

2 CALSLT1

1 CALSLT0

0 STCAL

Status Register Bit Function Description

Comment

This bit is always 0.

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.

These four bits are always 0.

Power Management Bits. These bits along with the SLEEP pin 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 indicating it is the status register that is being read. See Table II.

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.

Don’t care bit.

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).

REV. A

–11–

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