CS5516-ASZ datasheet(12/41 Pages) CIRRUS

12 / 41 page

The CS5516/20 includes a microcontroller which

manages operation of the chip. Included in the

microcontroller are eight different registers asso-

ciated with the operation of the device. An 8-bit

command register is used to interpret instruc-

tions received via the serial port. When power

is applied, and the device has been reset, the se-

rial port is initialized into the command mode.

In this mode it is waiting to receive an 8-bit

command via its serial port. The first 8 bits into

the serial port are placed into the command reg-

ister. Table 1 lists all the valid command words

for reading from or writing to internal registers

of the converter. Once a valid 8-bit command

word has been received and decoded, the serial

port goes into data mode. In data mode the next

24 serial clock pulses shift data either into or out

of the serial port. When writing data to the port,

the data may immediately follow the command

word. When reading data from the port, the user

must pause after clocking in the 8-bit command

word to allow the microcontroller time to decode

the command word, access the appropriate regis-

ter to be read, and present its 24-bit word to the

port. The microcontroller will signal when the

24-bit read data is available by causing the

DRDY pin to go low.

The user must write or read the full 24-bit word

except in the case of reading conversion data. In

read data conversion mode, the user may read

less than 24 bits if CS is then made inactive

(CS = 1). CS going inactive releases user control

over the port and allows new data updates to the

port.

The user can instruct the on-chip microcontroller

to perform certain operations via the configura-

tion register. Whenever a new word is written

to the 24-bit configuration register, the micro-

controller then decodes the word and executes

the configuration register instructions. Table 2

illustrates the bits of the configuration register.

The bits in the configuration register will be dis-

cussed in various sections of this data sheet.

Command Register

RSB2

RSB1

RSB0

R/W0

BIT

NAME

VALUE

FUNCTION

Must always be logic 1

RSB2-0

000

001

010

011

100

101

110

111

Selects Register to be Read or Written per R/W bit

CONVERSION DATA (read only)

CONFIGURATION

GAIN

DAC

RATIOMETRIC OFFSET

NON-RATIOMETRIC OFFSET - AIN

NON-RATIOMETRIC OFFSET - VREF

NOT USED

R/W

Read/Write

Write to the register selected by the RSB2-0 bits

Read from the register selected by the RSB2-0 bits

Not Used

Table 1. CS5516 and CS5520 Commands

CS5516, CS5520

DS74F1

DS74F2

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