Using the Software: ADS1299 Control Registers and GUI
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Figure 21. Simplified Diode Arrangement
The output voltage corresponding to a given temperature can be read selecting the Temperature Sensor
option on the Channel Control Registers GUI (see Figure 17) and verified using the Analysis→Scope tab
as shown in Figure 22. The number 0.146V (on the y-axis) can be calculated as a temperature using
Equation 1:
Temperature = (0.146 – 0.145300) / 0.00049 + 25 = 26.4°C
It should be noted that the temperature sensor input cannot be used with a gain setting of 24 as it will
saturate the PGA output.
Figure 22. Eight Channel Read of Internal Temperature Data
22
EEG Front-End Performance Demonstration Kit
SLAU443–May 2012
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