ADS131M08IPBSR datasheet(44/118 Pages) TI2

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8.5.1.10.7.1 Reading a Single Register

Read a single register from the device by specifying nnn nnnn as zero in the RREG command word. As with all

SPI commands on the ADS131M08, the response occurs on the output in the frame following the command.

Instead of a unique acknowledgment word, the response word is the contents of the register whose address is

specified in the command word. Figure 8-23 shows an example of reading a single register.

DRDY

SCLK

DIN

DOUT

Channel 0 Data

Channel 1 Data

Channel 7 Data

CRC

Response

Hi-Z

Channel 0 Data

Data

RREG

CRC

Command

CRC

Figure 8-23. Reading a Single Register

8.5.1.10.7.2 Reading Multiple Registers

Multiple registers are read from the device when nnn nnnn is specified as a number greater than zero in the

RREG command word. Like all SPI commands on the ADS131M08, the response occurs on the output in the

frame following the command. Instead of a single acknowledgment word, the response spans multiple words in

order to shift out all requested registers. Continue toggling SCLK to accommodate outputting the entire data

stream. ADC conversion data are not output in the frame following an RREG command to read multiple

registers. Figure 8-24 shows an example of reading multiple registers.

SCLK

DIN

DOUT

Channel 0 Data

Channel 1 Data

Channel 7 Data

CRC

Response

Hi-Z

RREG

ack

RREG

CRC

Command

st UHJLVWHU¶V

data

nd UHJLVWHU¶V

data

N-1

th UHJLVWHU¶V

data

th UHJLVWHU¶V

data

CRC

Hi-Z

CRC

Figure 8-24. Reading Multiple Registers

ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

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