Datasheet

DIN
DOUT
DRDY
RDATAC
SCLK
16Bits
1
8
1
16
NOP
0001010X
DIN
DRDY
0001011X
SDATAC
ADS1146
ADS1147
ADS1148
SBAS453F –JULY 2009–REVISED APRIL 2012 www.ti.com
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 16 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 will occur.
Figure 44. 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 45. Stop Reading Data Continuously
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