Texas Instruments ADS1282, Manual

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SCLK
DIN
Command
Byte
Command
Byte
t
(1)
SCLKDLY
ADS1282
SBAS418I – SEPTEMBER 2007 – REVISED MARCH 2015 www.ti.com
10 Commands
The commands listed in Table 20 control the In Read Data Continuous mode, the ADS1282 places
operation of the ADS1282. Most commands are conversion data on the DOUT pin as SCLK is
stand-alone (that is, 1 byte in length); the register applied. As a consequence of the potential conflict of
reads and writes require a second command byte in conversion data on DOUT and data placed on DOUT
addition to the actual data bytes. resulting from a register or Read Data By Command
operation, it is necessary to send a STOP Read Data
A delay of 24 f
CLK
cycles between commands and
Continuous command before Register or Data Read
between bytes within a command is required, starting
By Command. The STOP Read Data Continuous
from the last SCLK rising edge of one command to
command disables the direct output of conversion
the first SCLK rising edge of the following command.
data on the DOUT pin.
This delay is shown in Figure 61 .
(1) t
SCLKDLY
= 24/f
CLK
(min).
Figure 61. Consecutive Commands
Table 20. Command Descriptions
COMMAND TYPE DESCRIPTION 1st COMMAND BYTE
(1) (2)
2nd COMMAND BYTE
(3)
WAKEUP Control Wake-up from Standby mode 0000 000X (00h or 01h)
STANDBY Control Enter Standby mode 0000 001X (02h or 03h)
SYNC Control Synchronize the A/D conversion 0000 010X (04h or 5h)
RESET Control Reset registers to default values 0000 011X (06h or 07h)
RDATAC Control Read data continuous 0001 0000 (10h)
SDATAC Control Stop read data continuous 0001 0001 (11h)
RDATA Data Read data by command
(4)
0001 0010 (12h)
RREG Register Read nnnnn register(s) at address rrrrr
(4)
001 r rrrr (20h + 000 r rrrr ) 000 n nnnn (00h + n nnnn )
WREG Register Write nnnnn register(s) at address rrrrr 010 r rrrr (40h + 000 r rrrr ) 000 n nnnn (00h + n nnnn )
OFSCAL Calibration Offset calibration 0110 0000 (60h)
GANCAL Calibration Gain calibration 0110 0001 (61h)
(1) X = don't care.
(2) rrrrr = starting address for register read and write commands.
(3) nnnnn = number of registers to be read/written – 1. For example, to read/write three registers, set nnnnn = 2 (00010).
(4) Required to cancel Read Data Continuous mode before sending a command.
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