Datasheet

www.ti.com
D
IN
SCLK
CLKIN
··· ···
······
11111100
(SYNC)
00000000
(WAKEUP)
SynchronizationOccursHere
D
IN
SCLK
11111101
(SLEEP)
NormalMode SleepMode NormalMode
00000000
(WAKEUP)
ADS1216
SBAS171D – NOVEMBER 2000 – REVISED SEPTEMBER 2006
SYSGCAL System Gain Calibration
Description: Performs a system gain calibration. The Full-Scale Calibration Register (FSC) is updated after this
operation. DRDY goes high at the beginning of the calibration. It goes low after the calibration completes and
settled data is ready. Do not send additional commands after issuing this command until DRDY goes low
indicating that the calibration is complete.
DSYNC Synchronize the A/D Conversion
Description: This command synchronizes the A/D conversion. To use, first shift in the command. Then shift in
the WAKEUP command. Synchronization occurs on the first CLKIN rising edge after the first SCLK used to shift
in the WAKEUP command.
Figure 39. DSYNC Command Sequence
SLEEP Sleep Mode
Description: This command puts the ADS1216 into a Sleep mode. After issuing the SLEEP command, make
sure there is no more activity on SCLK while CS is low because this will interrupt Sleep mode. If CS is high,
SCLK activity is allowed during Sleep mode. To exit Sleep mode, issue the WAKEUP command.
Figure 40. SLEEP Command Sequence
WAKEUP Complete Synchronization or Exit Sleep Mode
Description: Used in conjunction with the SYNC and STANDBY commands. Two values (all zeros or all ones)
are available for this command.
RESET Reset Registers to Default Values
Description: Returns all registers to their default values. This command will also stop the Read Data
Continuous mode. While in the Read Data Continuous mode, the RESET command must be issued after DRDY
goes low and complete before DRDY returns high.
31
Submit Documentation Feedback