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DIN
SCLK
0000 001X
(STANDBY)
Operating
Standby Mode
Operating
0000 000X
(WAKEUP)
SBAS418I – SEPTEMBER 2007 – REVISED MARCH 2015
WAKEUP: Wake-Up from Standby Mode
SDATAC: Stop Read Data Continuous
Description:
This command is used to exit the
Description:
This command stops the Read Data
standby mode. Upon sending the command, the time
Continuous mode. Exiting the Read Data Continuous
for the first data to be ready is illustrated in
mode is required before sending Register and Data
and
. Sending this command during normal
read commands. This command suppresses the
operation has no effect; for example, reading data by
DRDY
output,
but
the
ADS1282
continues
the Read Data Continuous method with DIN held low.
conversions.
STANDBY: Standby Mode
RDATA: Read Data by Command
Description:
This command places the ADS1282
Description:
This command reads the conversion
into Standby mode. In Standby, the device enters a
data. See the
section for
reduced power state where a low quiescent current
more details.
remains to keep the register settings and SPI
RREG: Read Register Data
interface active. For complete device shutdown, take
the PWDN pin low (register settings are not saved).
Description:
This command is used to read single or
To exit Standby mode, issue the WAKEUP command.
multiple register data. The command consists of a
The
operation
of
Standby
mode
is
shown
in
two-byte op-code argument followed by the output of
register data. The first byte of the op-code includes
the starting address, and the second byte specifies
the number of registers to read – 1.
First command byte: 001r rrrr, where
rrrrr
is the
starting address of the first register.
Second command byte: 000n nnnn, where
nnnnn
is
the number of registers – 1 to read.
Starting with the 16th falling edge of SCLK, the
register data appear on DOUT.
Figure 62. Standby Command Sequence
The RREG command is illustrated in
. Note
that a delay of 24 f
CLK
cycles is required between
SYNC: Synchronize the A/D Conversion
each byte transaction.
Description:
This
command
synchronizes
the
WREG: Write to Register
analog-to-digital (A/D) conversion. Upon receipt of the
command, the reading in progress is cancelled and
Description:
This command writes single or multiple
the conversion process is re-started. In order to
register data. The command consists of a two-byte
synchronize multiple ADS1282s, the command must
op-code argument followed by the input of register
be sent simultaneously to all devices. Note that the
data. The first byte of the op-code contains the
SYNC pin must be high for this command.
starting address and the second byte specifies the
number of registers to write – 1.
RESET: Reset the Device
First command byte: 001r rrrr, where
rrrrr
is the
Description:
The RESET command resets the
starting address of the first register.
registers to default values, enables the Read Data
Continuous
mode,
and
restarts
the
conversion
Second command byte: 000n nnnn, where
nnnnn
is
process; the RESET command is functionally the
the number of registers – 1 to write.
same as the RESET pin. See
for the
Data byte(s): one or more register data bytes,
RESET command timing.
depending on the number of registers specified.
RDATAC: Read Data Continuous
illustrates the WREG command.
Description:
This command enables the Read Data
Note that a delay of 24 f
CLK
cycles is required
Continuous mode (default mode). In this mode,
between each byte transaction.
conversion data can be read from the device directly
without the need to supply a data read command.
Each time DRDY falls low, new data are available to
read. See the
section for
more details.
Copyright © 2007–2015, Texas Instruments Incorporated
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