Datasheet

Temperature ( C) =°
Temperature Reading ( V) 145,300 Vm - m
490 V/ Cm °
+ 25 C°
2x
1x
1x
8x
AVDD
AVSS
ADS1x98ECG-FE Input Signals www.ti.com
4.3 Temperature Sensor
The internal temperature sensor on the ADS1298 is shown in Figure 32. When the internal MUX is routed
to the temperature sensor input, the ADC internal temperature is calculated from the ADC output voltage
using Equation 1.
Figure 32. Internal Temperature Sensor
(1)
The ADC can be configured to give a temperature reading by selecting the Temperature Sensor option on
the Channel Control Registers GUI (see Section 3.4.2.2) and verified using the Scope tab as shown in
Figure 33. The number 0.1447V (on the y-axis) can be calculated as a temperature using Equation 1:
Temperature = (0.1447 – 0.145300) / 0.00049 + 25 = 23.78°C
A more detailed description of the Scope tab is provided in Section 3.5.1.
Figure 33. Eight-Channel Read of Internal Temperature
34
ADS1298ECG-FE/ADS1198ECG-FE SBAU171C–May 2010–Revised September 2012
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