ADS1218_14 Datasheet, PDF (35/45 Pages) Texas Instruments – 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory

ADS1218
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SYSOCAL
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
System Offset Calibration
Description: Starts the system offset calibration process. For a system offset calibration, the input should be set
to 0V differential, and the ADS1218 computes the OCR register value that will compensate for offset errors. The
Offset Control Register (OCR) is updated after this operation.
Operands: None
Bytes: 1
Encoding: 1111 0011
Data Transfer Sequence:
D_IN 1111 0011
SYSGCAL
System Gain Calibration
Description: Starts the system gain calibration process. For a system gain calibration, the differential input
should be set to the reference voltage and the ADS1218 computes the FSR register value that will compensate
for gain errors. The FSR is updated after this operation.
Operands: None
Bytes: 1
Encoding: 1111 0100
Data Transfer Sequence:
D_IN 1111 0100
DSYNC
Description: Synchronizes the ADS1218 to the serial clock edge.
Operands: None
Bytes: 1
Encoding: 1111 1100
Data Transfer Sequence:
D_IN 1111 1100
Sync DRDY
SLEEP
Sleep Mode
Description: Puts the ADS1218 into a low-power sleep mode. SCLK must be inactive while in sleep mode. To
exit this mode, issue the WAKEUP command.
Operands: None
Bytes: 1
Encoding: 1111 1101
Data Transfer Sequence:
D_IN 1111 1101
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