Datasheet
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D
OUT
D
IN
24Bits
00000011
t
6
ADS1216
SBAS171D – NOVEMBER 2000 – REVISED SEPTEMBER 2006
CSRAM Calculate Checksum for Selected RAM Bank
Description: This command calculates the checksum for the selected RAM bank. The checksum is calculated
as the sum of all the bytes in the registers with the carry ignored. Do not issue any additional commands while
the checksum is being calculated.
CSRAMX Calculate Checksum for Selected RAM Bank,
Ignoring Certain Bits
Description: This command calculates the checksum of the selected RAM bank. The checksum is calculated as
a sum of all the bytes in the RAM bank with the carry ignored. The ID, DRDY, and DIO bits are masked and are
not included in the checksum calculation. Do not issue any additional commands while the checksum is being
calculated.
CSARAM Calculate Checksum for all RAM Banks
Description: This command calculates the checksum for all RAM banks. The checksum is calculated as a sum
of all the bytes in the RAM bank with the carry ignored. Do not issue any additional commands while the
checksum is being calculated.
Calculate Checksum for all RAM Banks, Ignoring
CSARAMX Certain Bits
Description: This command calculates the checksum for all RAM banks. The checksum is calculated as a sum
of all the bytes in the RAM bank with the carry ignored. The ID, DRDY, and DIO bits are masked and are not
included in the checksum calculation. Do not issue any additional commands while the checksum is being
calculated.
CSREG Calculate Checksum for the Registers
Description: This command calculates the checksum for the registers. The checksum is calculated as a sum of
all the bytes in the registers with the carry ignored. The ID, DRDY, and DIO bits are masked and are not
included in the checksum calculation. Do not issue any additional commands while the checksum is being
calculated.
See the Timing Characteristics for the required delay between the end of the checksum commands and the
beginning of shifting data on D
OUT
: t
6
. Note that this time is dependent on the specific checksum command used.
Figure 38. Checksum Command Sequence
SYSOCAL System Offset Calibration
Description: Performs a system offset calibration. The Offset Calibration Register (OFC) 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.
30
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