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The Standby and Wakeup controls send the corresponding commands to the ADS1281 (shown in
Figure 24 ). Data cannot be collected while the device is in the Standby mode.
Figure 24. Controls
11.1.2 Calibration Tab
A calibration feature is integrated into the ADS1281 to correct for offset and gain errors. The
ADS1281EVM-PDK software is designed to allow the user to use either the built-in system calibration
commands or manually calibrate the device by directly entering the values for the offset and gain registers
of the ADS1281.
11.1.2.1 System Calibration
The Start Calibration button is used for system calibration by sending the Offset and Gain Calibration
commands to the ADS1281. Which command is sent is determined by the radio buttons in the Calibration
Type groupbox (see
Figure 25 ). The calibrations should be performed separately before testing. See the
ADS1281 product data sheet for more information on calibration.
A zero input signal must be applied before performing offset calibration. The Offset radial button should be
selected. When Start Calibration is pushed, the offset calibration is performed and the resulting value is
reflected in the OFC register display (in hex).
A full-scale dc input should be applied for gain calibration. The Gain radio button should be selected.
When Start Calibration is pushed, the gain calibration is performed and the resulting value is reflected in
the FSC register display (in hex).
22 ADS1281EVM and ADS1281EVM-PDK User ' s Guide SBAU143C – March 2009 – Revised May 2011
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