CS5480 datasheet(29/70 Pages) CIRRUS

29 / 70 page

CS5480

DS980F3

6. HOST COMMANDS AND REGISTERS

6.1 Host Commands

The first byte sent to the CS5480 SDI/RX pin contains

the host command. Four types of host commands are

required to read and write registers and instruct the

calculation engine. The two most significant bits (MSBs)

of the host command defines the function to be

performed. The following table depicts the types of

commands.

Table 3. Command Format

6.1.1 Memory Access Commands

The CS5480 memory has 12-bit addresses and is

organized as P5 P4 P3 P2 P1 P0 A5 A4 A3 A2 A1 A0 in

64 pages of 64 addresses each. The higher 6 bits

specify the page number. The lower 6 bits specify the

address within the selected page.

6.1.1.1 Page Select

A page select command is designated by setting the two

MSBs of the command to binary ‘10’. The page select

command provides the CS5480 with the page number

of the register to access. Register read and write

commands access 1 of 64 registers within a specified

page. Subsequent register reads and writes can be

performed once the page has been selected.

Figure 20. Byte Sequence for Page Select

6.1.1.2 Register Read

A register read is designated by setting the two MSBs of

the command to binary ‘00’. The lower 6 bits of the

been received, the CS5480 will send 3 bytes of register

data onto the SDO/TX pin.

Figure 21. Byte Sequence for Register Read

6.1.1.3 Register Write

A register write command is designated by setting the

two MSBs of the command to binary ‘01’. The lower 6

bits of the register write command are the lower 6 bits of

the 12-bit register address. A register write command

must be followed by 3 bytes of data.

Figure 22. Byte Sequence for Register Write

6.1.2 Instructions

An instruction command is designated by setting the

two MSBs of the command to binary '11'. An Instruction

command will interrupt any process currently running

and initiate a new process in the CS5480.

Figure 23. Byte Sequence for Instructions

These new processes include calibration, power

control, and soft reset. The following table depicts the

types of instructions. Note that when the CS5480 is in

continuous conversion mode, an unexpected or invalid

instruction command could cause the device to stop

continuous conversion and enter an unexpected

operation mode. The host processor should keep

monitoring the CS5480 operation status and react

accordingly.

Table 4. Instruction Format

Function

Binary Value

Note

Read

0 0 A5 A4 A3 A2 A1 A0

A[5:0] specifies the

Write

0 1 A5 A4 A3 A2 A1 A0

Page Select

1 0 P5 P4 P3 P2 P1 P0

P[5:0] specifies the

page.

Instruction

1 1 C5 C4 C3 C2 C1 C0

C[5:0] specifies the

instruction.

SDI/RX

Page Select Cmd.

SDO/TX

SDI/RX

DATA

Read Cmd.

Function

Binary Value

Note

Controls

0 C4 C3 C2 C1 C0

0 00001 - Software Reset

0 00010 - Standby

0 00011 - Wakeup

0 10100 - Single Conv.

0 10101 - Continuous Conv.

0 11000 - Halt Conv.

C[5] specifies the

instruction type:

0 = Controls

1 = Calibrations

Calibrations

1 C4 C3 C2 C1 C0

1 00C2C1C0 DC Offset

1 10C2C1C0 AC Offset*

1 11C2C1C0 Gain

For calibrations,

C[4:3] specifies the

type of calibration.

*AC Offset calibra-

tion valid only for

current channel

1C4 C3 C2 C1 C0

1 C4C3 0 0 1

1 C4C3 0 1 0

1 C4C3 0 1 1

1 C4C3 1 0 0

1 C4C3 1 1 0

All Four

For calibrations,

C[2:0] specifies the

channel(s).

SDI/RX

DATA

Write Cmd.

SDI/RX

Instruction

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