Datasheet

www.ti.com
D
OUT
SCLK
D
IN
MSB
t
6
Mid-Byte LSB
DRDY
00000001
· · ·· · ·
D
OUT
D
IN
24Bits
DRDY
24Bits
00000011
t
6
D
OUT
D
IN
DRDY
input_data input_data input_data
MSB Mid-Byte LSB
ADS1216
SBAS171D – NOVEMBER 2000 – REVISED SEPTEMBER 2006
RDATA Read Data
Description: Issue this command after DRDY goes low to read a single conversion result. After all 24 bits have
been shifted out on D
OUT
, DRDY goes high. It is not necessary to read back all 24 bits, but DRDY will then not
return high until new data is being updated. See the Timing Characteristics for the required delay between the
end of the RDATA command and the beginning of shifting data on D
OUT
: t
6
.
Figure 30. RDATA Command Sequence
RDATAC Read Data Continuous
Description: Issue command after DRDY goes low to enter the Read Data Continuous mode. This mode
enables the continuous output of new data on each DRDY without the need to issue subsequent read
commands. After all 24 bits have been read, DRDY goes high. It is not necessary to read back all 24 bits, but
DRDY will then not return high until new data is being updated. This mode may be terminated by the Stop Read
Data Continuous command (STOPC). Because D
IN
is constantly being monitored during the Read Data
Continuous mode for the STOPC or RESET command, do not use this mode if D
IN
and D
OUT
are connected
together. See the Timing Characteristics for the required delay between the end of the RDATAC command and
the beginning of shifting data on D
OUT
: t
6
.
Figure 31. RDATAC Command Sequence
On the following DRDY, shift out data by applying SCLKs. The Read Data Continuous mode terminates if
input_data equals the STOPC or RESET command in any of the three bytes on D
IN
.
Figure 32. D
IN
and D
OUT
Command Sequence During Read Continuous mode
27
Submit Documentation Feedback