CS5531-AS Просмотр технического описания (PDF) - Cirrus Logic

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CS5531-AS

16-bit and 24-bit ADCs withUltra-low-noise PGIA

Cirrus Logic 

CS5531/32/33/34-AS

2.2.2. Command Register Quick Reference

D7(MSB)

D6

D5

D4

D3

D2

D1

D0

0

ARA

CS1

CS0

R/W

RSB2

RSB1

RSB0

BIT NAME

VALUE FUNCTION

D7

Command Bit, C

0 Must be logic 0 for these commands.

1 These commands are invalid if this bit is logic 1.

D6

Access Registers as 0 Ignore this function.

Arrays, ARA

1 Access the respective registers, offset, gain, or channel-setup, as an array of regis-

ters. The particular registers accessed are determined by the RS bits. The registers

are accessed MSB first with physical channel 0 accessed first followed by physical

channel 1 next and so forth.

D5-D4 Channel Select Bits,

CS1-CS0

00 CS1-CS0 provide the address of one of the two (four for CS5533/34) physical input

01 channels. These bits are also used to access the calibration registers associated

10 with the respective physical input channel. Note that these bits are ignored when

11 reading data register.

D3

Read/Write, R/W

0 Write to selected register.

1 Read from selected register.

D2-D0 Register Select Bit,

RSB3-RSB0

000 Reserved

001 Offset Register

010 Gain Register

011 Configuration Register

101 Channel-Setup Registers

110 Reserved

111 Reserved

D7(MSB)

D6

1

MC

D5

CSRP2

D4

CSRP1

D3

CSRP0

D2

CC2

D1

CC1

D0

CC0

BIT NAME

D7

Command Bit, C

VALUE FUNCTION

0 These commands are invalid if this bit is logic 0.

1 Must be logic 1 for these commands.

D6

Multiple Conver-

sions, MC

0 Perform fully settled single conversions.

1 Perform conversions continuously.

D5-D3 Channel-Setup Reg-

ister Pointer Bits,

CSRP

000 These bits are used as pointers to the Channel-Setup registers. Either a single con-

... version or continuous conversions are performed on the channel setup register

111 pointed to by these bits.

D2-D0 Conversion/Calibra-

tion Bits, CC2-CC0

000 Normal Conversion

001 Self-Offset Calibration

010 Self-Gain Calibration

011 Reserved

100 Reserved

101 System-Offset Calibration

110 System-Gain Calibration

111 Reserved

DS289F5

17

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