CS5522-AP datasheet(40/56 Pages) CIRRUS

40 / 56 page

CS5521/22/23/24/28

DS317F2

of the configuration register.

4) Once the CSRs are programmed, repeated conver-

sions on up to 16 Setups can be performed by is-

suing only one command byte.

5) The single conversion mode also requires only one

command, but whenever another or a different

single conversion is wanted, this command or a

modified version of it has to be issued again.

6) The NULL command is used to keep the serial port

in command mode, once it is in command mode.

2.5

Conversion Output Coding

The CS5521/22/23/24/28 devices output 16-bit

(CS5521/23) and 24-bit (CS5522/24/28) data con-

version words. To read a conversion word, the user

must read the conversion data FIFO. The conver-

sion data FIFO is up to 192 bits long and outputs

the conversions MSB first. The last byte of the con-

version data word (CS5521/23 only) contains data

monitoring flags. The channel indicator (CI) bits

keep track of which physical channel was convert-

ed, and the overrange flag (OF) and the oscillation

detect (OD) bits monitor conversions to determine

if a valid conversion was performed. Refer to the

Conversion Data FIFO Descriptions section for

more details.

The CS5521/22/23/24/28 output data conversions

in binary format when operating in unipolar mode

and in two’s complement when operating in bipolar

mode. Refer to the Conversion Data FIFO De-

scriptions section for more details.

Note: VFS in the table equals the voltage between ground and full scale for any of the unipolar gain ranges, or the

voltage between

± full scale for any of the bipolar gain ranges. See text about error flags under overrange

conditions.

Unipolar Input

Voltage

Offset

Binary

Bipolar Input

Voltage

Two’s

Complement

Unipolar Input

Voltage

Offset

Binary

Bipolar Input

Voltage

Two’s

Complement

>(VFS-1.5 LSB)

FFFF

>(VFS-1.5 LSB)

7FFF

>(VFS-1.5 LSB) FFFFFF

>(VFS-1.5 LSB)

7FFFFF

VFS-1.5 LSB

FFFF

------

FFFE

VFS-1.5 LSB

7FFF

------

7FFE

VFS-1.5 LSB

FFFFFF

------

FFFFFE

VFS-1.5 LSB

7FFFFF

------

7FFFFE

VFS/2-0.5 LSB

8000

------

7FFF

-0.5 LSB

0000

------

FFFF

VFS/2-0.5 LSB

800000

------

7FFFFF

-0.5 LSB

000000

------

FFFFFF

+0.5 LSB

0001

------

0000

-VFS+0.5 LSB

8001

------

8000

+0.5 LSB

000001

------

000000

-VFS+0.5 LSB

800001

------

800000

<(+0.5 LSB)

0000

<(-VFS+0.5 LSB)

8000

<(+0.5 LSB)

000000

<(-VFS+0.5 LSB)

800000

Table 6. Output Coding for 16-bit CS5521/23 and 24-bit CS5522/24/28

CS5521/23 16-Bit Output Coding

CS5522/24/28 24-Bit Output Coding

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