ADS1246 datasheet(49/66 Pages) TI

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ADS1246

ADS1247

ADS1248

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SBAS426D – AUGUST 2008 – REVISED MARCH 2010

SPI COMMANDS

SPI COMMAND DEFINITIONS

The commands shown in Table 26 control the operation of the ADS1246/7/8. Some of the commands are

stand-alone commands (for example, RESET), whereas others require additional bytes (for example, WREG

requires command, count, and the data bytes).

Operands:

n = number of registers to be read or written (number of bytes – 1)

r = register (0 to 15)

x = don't care

Table 26. SPI Commands

COMMAND TYPE

COMMAND

DESCRIPTION

1st COMMAND BYTE

2nd COMMAND BYTE

WAKEUP

Exit sleep mode

0000 000x (00h, 01h)

SLEEP

Enter sleep mode

0000 001x (02h, 03h)

System Control

SYNC

Synchronize the A/D conversion

0000 010x (04h, 05h)

0000-010x (04,05h)

RESET

Reset to power-up values

0000 011x (06h, 07h)

NOP

No operation

1111 1111 (FFh)

RDATA

Read data once

0001 001x (12h, 13h)

Data Read

RDATAC

Read data continuously

0001 010x (14h, 15h)

SDATAC

Stop reading data continuously

0001 011x (16h, 17h)

Read Register

RREG

Read from register rrrr

0010 rrrr (2xh)

0000_nnnn

Write Register

WREG

Write to register rrrr

0100 rrrr (4xh)

0000_nnnn

SYSOCAL

System offset calibration

0110 0000 (60h)

Calibration

SYSGCAL

System gain calibration

0110 0001 (61h)

SELFOCAL

Self offset calibration

0110 0010 (62h)

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