Datasheet

ADS1240, 1241
20
SBAS173F
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SYSOCAL–System Offset Calibration
Description: Initiates a system offset calibration. The input
should be set to 0V, and the ADS1240 and ADS1241 compute
the OCR value that compensates for offset errors. The Offset
Calibration Register (OCR) is updated after this operation. The
user must apply a zero input signal to the appropriate analog
inputs. The OCR register is automatically updated afterwards.
Operands: None
Bytes: 1
Encoding: 1111 0011
Data Transfer Sequence:
SYSGCAL–System Gain Calibration
Description: Starts the system gain calibration process. For
a system gain calibration, the input should be set to the
reference voltage and the ADS1240 and ADS1241 compute
the FSR value that will compensate for gain errors. The FSR
is updated after this operation. To initiate a system gain
calibration, the user must apply a full-scale input signal to the
appropriate analog inputs. FCR register is updated automati-
cally.
Operands: None
Bytes: 1
Encoding: 1111 0100
Data Transfer Sequence:
DSYNC–Sync
DRDY
Description: Synchronizes the ADS1240 and ADS1241 to an
external event.
Operands: None
Bytes: 1
Encoding: 1111 1100
Data Transfer Sequence:
SLEEP–Sleep Mode
Description: Puts the ADS1240 and ADS1241 into a low
power sleep mode. To exit sleep mode, issue the WAKEUP
command.
Operands: None
Bytes: 1
Encoding: 1111 1101
Data Transfer Sequence:
RESET–Reset to Default Values
Description: Restore the registers to their power-up values.
This command stops the Read Continuous mode.
Operands: None
Bytes: 1
Encoding: 1111 1110
Data Transfer Sequence:
D
IN
1111 0011
D
IN
1111 0100
D
IN
1111 1100
D
IN
1111 1101
D
IN
1111 1110
WAKEUP
Description: Wakes the ADS1240 and ADS1241 from SLEEP
mode.
Operands: None
Bytes: 1
Encoding: 1111 1011
Data Transfer Sequence:
D
IN
1111 1011