ADS131B04-Q1
ZHCSMK3B –NOVEMBER 2020 –REVISED NOVEMBER 2021
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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 ADS131B04-Q1, 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. 图8-21 shows an example of reading a single register.
DRDY
CS
SCLK
DIN
RREG
CRC
Command
CRC
Register
Data
DOUT
Hi-Z
Response
Channel 0 Data Channel 1 Data Channel 2 Data Channel 3 Data
CRC
Hi-Z
Channel 0 Data
图8-21. 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. Like all SPI commands on the ADS131B04-Q1, 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. 图8-22 shows an example of reading multiple registers.
CS
SCLK
DIN
RREG
CRC
Command
CRC
RREG
ack
1
st register‘s
data
2
nd register‘s
data
N-1th register‘s
data
N
th register‘s
data
DOUT
Hi-Z
Response
Channel 0 Data Channel 1 Data Channel 2 Data Channel 3 Data
CRC
Hi-Z
CRC
Hi-Z
图8-22. Reading Multiple Registers
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