SLAU443 Datasheet, PDF (25/68 Pages) Texas Instruments – EEG Front-End Performance Demonstration Kit

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Using the Software: ADS1299 Control Registers and GUI
5.5.2 Lead-Off Status Registers (LOFF_STATP and LOFF STATN)
These registers store the output of the lead-off comparator that corresponds with each input. When a lead
is disconnected, the corresponding register bit activates low. The GUI for this feature is enabled by
clicking in the upper right-hand corner of the EVM software on the Show/Poll Lead-Off Status button.
Pressing this button causes a pop-up box that shows the status of the lead-off registers. The GUI shows
when a lead is disconnected by turning its bit from green to red. Figure 26 illustrates the Lead-Off Status
Registers GUI controls.
Figure 26. Lead-Off Status Indicator
5.5.3 Bias Drive Derivation Control Registers
The Bias Drive Derivation Control Registers enable the user to set any combination of positive and/or
negative electrodes to derive the BIAS voltage that is fed to the internal bias drive amplifier. Figure 27
shows the corresponding GUI controls. The details about bias drive can be found in Section 5.5.
SLAU443 – May 2012
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