ADS1294 datasheet(44/88 Pages) TI

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SCLK

DIN

OPCODE1

OPCODE2

DOUT

REGDATA

REGDATA+1

SCLK

DIN

OPCODE1

OPCODE2

REGDATA1

REGDATA2

DOUT

ADS1294, ADS1294R

ADS1296, ADS1296R

ADS1298, ADS1298R

SBAS459H

– JANUARY 2010 – REVISED OCTOBER 2011

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RREG: Read From Register

This opcode reads register data. The Register Read command is a two-byte opcode followed by the output of the

opcode specifies the number of registers to read

– 1.

First opcode byte: 001r rrrr, where r rrrr is the starting register address.

Second opcode byte: 000n nnnn, where n nnnn is the number of registers to read

– 1.

The 17th SCLK rising edge of the operation clocks out the MSB of the first register, as shown in Figure 49. When

the device is in read data continuous mode, it is necessary to issue a SDATAC command before a RREG

command can be issued. An RREG command can be issued any time. However, because this command is a

multi-byte command, there are restrictions on the SCLK rate depending on the way the SCLKs are issued. See

the Serial Clock (SCLK) subsection of the SPI Interface section for more details. Note that CS must be low for

the entire command.

Figure 49. RREG Command Example: Read Two Registers Starting from Register 00h (ID Register)

(OPCODE 1 = 0010 0000, OPCODE 2 = 0000 0001)

WREG: Write to Register

This opcode writes register data. The Register Write command is a two-byte opcode followed by the input of the

The second byte of the opcode specifies the number of registers to write

– 1.

First opcode byte: 010r rrrr, where r rrrr is the starting register address.

Second opcode byte: 000n nnnn, where n nnnn is the number of registers to write

– 1.

After the opcode bytes, the register data follows (in MSB-first format), as shown in Figure 50. WREG command

can be issued any time. However, because this command is a multi-byte command, there are restrictions on the

SCLK rate depending on the way the SCLKs are issued. See the Serial Clock (SCLK) subsection of the SPI

Interface section for more details. Note that CS must be low for the entire command.

Figure 50. WREG Command Example: Write Two Registers Starting from 00h (ID Register)

(OPCODE 1 = 0100 0000, OPCODE 2 = 0000 0001)

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Product Folder Link(s): ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R

ADS1294 Datasheet(PDF) 44 Page - Texas Instruments

ADS1294 Datasheet(HTML) 44 Page - Texas Instruments

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