ADS1292 datasheet(37/69 Pages) TI

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SCLK

DIN

OPCODE1

OPCODE2

DOUT

REGDATA

REGDATA+1

SCLK

DIN

OPCODE1

OPCODE2

REGDATA1

REGDATA2

DOUT

ADS1291

ADS1292

ADS1292R

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SBAS502A – DECEMBER 2011 – REVISED MARCH 2012

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 45. When

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

command can be issued. The RREG command can be issued at 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 45. 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 46. The WREG

command can be issued at 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 46. WREG Command Example: Write Two Registers Starting from 00h (ID Register)

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

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ADS1292 Datasheet(PDF) 37 Page - Texas Instruments

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