CS5525-ASZ datasheet(11/30 Pages) CIRRUS

11 / 30 page

CS5525 CS5526

DS202F5

Reading/Writing On-Chip Registers

The CS5525/26’s offset, gain, and configuration

registers are read/writable while the conversion

data register is read only.

To perform a read from a specific register, the R/W

bit of the command word must be a logic 1. The SC,

CC, and PS/R bits must be logic 0 and the CB

(MSB) bit must be a logic 1. The register to be writ-

ten is selected with the RSB2-RSB0 bits of the

command word.

To perform a write to a specific register, the R/W

bit of the command word must be a logic 0. The SC,

CC, and PS/R bits must be logic 0 and the CB (MSB)

bit must be a logic 1. The register to be written is se-

lected with the RSB2-RSB0 bits of the command

word. Figure 6 illustrates the serial sequence neces-

sary to write to, or read from the serial port.

If the Set-up Registers are chosen with the RSB2-

RSB0 bits, the registers are read or written in the

following sequence: Offset, Gain and Configura-

tion. This is accomplished by following one 8-bit

command word with three 24-bit data words for a

total of 72 data bits.

Command Register

D7(MSB)

D6D5D4D3D2D1D0

R/W

RSB2

RSB1

RSB0

PS/R

BIT

NAME

VALUE

FUNCTION

Command Bit, CB

Null command (no operation). All command bits, including

CB must be 0.

Logic 1 for executable commands.

Single Conversion, SC

Single Conversion not active.

Perform a conversion.

Continuous Conversions,

Continuous Conversions not active.

Perform conversions continuously.

Read/Write, R/W

Write to selected register.

Read from selected register.

D3-D1

RSB2-RSB0

000

001

010

011

100

101

110

111

Offset Register

Gain Register

Configuration Register

Conversion Data Register (read only)

Set-up Registers (Offset, Gain, Configuration)

Reserved

Power Save/Run, PS/R

Run

Power Save

Table 1. Command Set

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