CS5531-AS datasheet(24/52 Pages) CIRRUS

24 / 52 page

CS5531/32/33/34

DS289PP5

2.2.4. Serial Port Interface

The CS5531/32/33/34’s serial interface consists of

four control lines: CS,SDI,SDO, SCLK.Figure 7

details the command and data word timing.

CS, Chip Select, is the control line which enables

access to the serial port. If the CS pin is tied low,

the port can function as a three wire interface.

SDI, Serial Data In, is the data signal used to trans-

fer data to the converters.

SDO, Serial Data Out, is the data signal used to

transfer output data from the converters. The SDO

output will be held at high impedance any time CS

is at logic 1.

SCLK, Serial Clock, is the serial bit-clock which

controls the shifting of data to or from the ADC’s

serial port. The CS pin must be held low (logic 0)

before SCLK transitions can be recognized by the

port logic. To accommodate optoisolators SCLK is

designed with a Schmitt-trigger input to allow an

optoisolator with slower rise and fall times to di-

rectly drive the pin. Additionally, SDO is capable

of sinking or sourcing up to 5 mA to directly drive

an optoisolator LED. SDO will have less than a 400

mV loss in the drive voltage when sinking or sourc-

ing 5 mA.

Command Time

8SCLKs

Data Time 32 SCLKs

Write Cycle

SCLK

SDI

MSB

Command Time

8SCLKs

SCLK

SDI

Read Cycle

SDO

MSB

LSB

Command Time

8SCLKs

8 SCLKs Clear SDO Flag

SDO

SCLK

SDI

MSB

LSB

Clock Cycles

000

Data Time 32 SCLKs

LSB

Data Conversion Cycle

/OWR

MCLK

*tdis the time it takes the ADC toperform aconversion. Seethe Single

Conversion and Continuous Conversion sections of the data sheet for more

details about conversion timing.

Figure 7. Command and Data Word Timing

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