AMC131M01DFMR datasheet(43/81 Pages) TI

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8.5.3.7.1 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 AMC131M01, 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 8-22 shows an example of reading a single register.

DRDY

SCLK

DIN

DOUT

Channel 0 Data

CRC

Response

Hi-Z

Channel 0 Data

Data

RREG

CRC

Command

CRC

Figure 8-22. Reading a Single Register

8.5.3.7.2 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. As with all SPI commands on the AMC131M01, the response occurs on the output in the

frame following the command. Instead of a single acknowledgment word, the response spans multiple words 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 8-23

shows an example of reading multiple registers.

SCLK

DIN

DOUT

Channel 0 Data

CRC

Response

Hi-Z

RREG

ack

RREG

CRC

Command

st register’s

data

nd register’s

data

N-1

th register’s

data

th register’s

data

CRC

Hi-Z

CRC

Figure 8-23. Reading Multiple Registers

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AMC131M01

SBASA57 – SEPTEMBER 2023

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