Texas Instruments ADS1194, Руководство пользователя, Страница: 30 / 57

Temperature ( C) = °
Temperature Reading ( V) 145,300 V m - m
490 V/ C m °
+ 25 C °
2x
1x
1x
8x
AVDD
AVSS
ADS1x98ECG-FE Input Signals
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30 SBAU171D – May 2010 – Revised January 2016
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ADS1298ECG-FE/ADS1198ECG-FE
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