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ADS131E04

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SBAS561A – JUNE 2012 – REVISED APRIL 2013

SPI COMMAND DEFINITIONS

The ADS131E0x provide flexible configuration control. The opcode commands, summarized in Table 9, control

and configure device operation. The opcode commands are stand-alone, except for the register read and register

write operations that require a second command byte plus data. CS can be taken high or held low between

opcode commands but must stay low for the entire command operation (especially for multibyte commands).

System opcode commands and the RDATA command are decoded by the ADS131E0x on the seventh SCLK

falling edge. The register read and write opcodes are decoded on the eighth SCLK falling edge. Be sure to follow

SPI timing requirements when pulling CS high after issuing a command.

Table 9. Command Definitions

COMMAND

DESCRIPTION

FIRST BYTE

SECOND BYTE

System Commands

WAKEUP

Wake-up from standby mode

0000 0010 (02h)

STANDBY

Enter standby mode

0000 0100 (04h)

RESET

Reset the device

0000 0110 (06h)

START

Start or restart (synchronize) conversions

0000 1000 (08h)

STOP

Stop conversion

0000 1010 (0Ah)

OFFSETCAL

Channel offset calibration

0001 1010 (1Ah)

Data Read Commands

Enable Read Data Continuous mode.

RDATAC

0001 0000 (10h)

This mode is the default mode at power-up.(1)

SDATAC

Stop Read Data Continuously mode

0001 0001 (11h)

RDATA

Read data by command; supports multiple read back.

0001 0010 (12h)

RREG

Read n nnnn registers starting at address r rrrr

001r rrrr (2xh)(2)

000n nnnn(2)

WREG

Write n nnnn registers starting at address r rrrr

010r rrrr (4xh)(2)

000n nnnn(2)

(1)

When in RDATAC mode, the RREG command is ignored.

(2)

n nnnn = number of registers to be read or written – 1. For example, to read or write three registers, set n nnnn = 0 (0010). r rrrr =

starting register address for read and write opcodes.

WAKEUP: Exit STANDBY Mode

This opcode exits low-power standby mode; see the STANDBY: Enter STANDBY Mode subsection of the SPI

Command Definitions section. Be sure to allow enough time for all circuits in shutdown mode to power up (see

the Electrical Characteristics for details). There are no SCLK rate restrictions for this command and it can be

issued at any time. Any following command must be sent after 4 tCLK cycles.

STANDBY: Enter STANDBY Mode

This opcode command enters low-power standby mode. All parts of the circuit are shut down except for the

reference section. The standby mode power consumption is specified in the Electrical Characteristics. There are

no SCLK rate restrictions for this command and it can be issued at any time. Do not send any other

command other than the wakeup command after the device enters standby mode.

RESET: Reset Registers to Default Values

This command resets the digital filter cycle and returns all register settings to default values. See the Reset

(RESET) subsection of the SPI Interface section for more details. There are no SCLK rate restrictions for this

command and it can be issued at any time. It takes 18 tCLK cycles to execute the RESET command. Avoid

sending any commands during this time.

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