Datasheet
DIN
DOUT
DRDY
RDATAC
SCLK
24Bits
1
8
1
24
NOP
0001010X
DIN
DRDY
0001011X
SDATAC
ADS1246
ADS1247
ADS1248
www.ti.com
SBAS426G –AUGUST 2008–REVISED OCTOBER 2011
DATA RETRIEVAL COMMANDS
RDATAC—Read data continuously.
The RDATAC command enables the automatic loading of a new conversion result into the output data
register. In this mode, the conversion result can be received once from the device after the DRDY signal
goes low by sending 24 SCLKs. It is not necessary to read back all the bits, as long as the number of bits
read out is a multiple of eight. The RDATAC command must be issued after DRDY goes low, and the
command takes effect on the next DRDY.
Be sure to complete data retrieval (conversion result or register read-back) before DRDY goes low, or the
resulting data will be corrupt. Successful register read operations in RDATAC mode require the knowledge of
when the next DRDY falling edge occurs.
Figure 76. Read Data Continuously
SDATAC—Stop reading data continuously.
The SDATAC command terminates the RDATAC mode. Afterwards, the conversion result is not
automatically loaded into the output shift register when DRDY goes low, and register read operations can be
performed without interruption from new conversion results being loaded into the output shift register. Use
the RDATA command to retrieve conversion data. The SDATAC command takes effect after the next DRDY.
Figure 77. Stop Reading Data Continuously
Copyright © 2008–2011, Texas Instruments Incorporated Submit Documentation Feedback 51
Product Folder Link(s): ADS1246 ADS1247 ADS1248