User Manual
16
V1.0
2021-04-28
Small Engine Management Evaluation Board
User Manual for TLTLE8080EM Evaluation Board
3
Application Example: Current Measurement with TLE8082 CFB
The current feedback pin (CFB4) of TLE8082ES provides a pull down current which is directly proportional to
the output current of channel 4. This information can be used e.g. to estimate the temperature of the applied
output stage load (O2 heater). The evaluation board reads back the supply voltage VIN. The resistance of the O2
heater can be calculated by using Ohms law. Figure 15 gives an overview how the temperature of the O2 heater
load can be estimated.
Figure 15
Overview of O2 heater temperature estimation
The voltage at CFB4 is pulled up to V5DD over R6. The resistance value of R6 can be individually adapted, if
required. The reference voltage VREF used for the microcontroller ADC can be modified in the Arduino software
sketch. Figure 16 gives an overview on the tune-able values.
Figure 16
ADC measurement setup can be modified to individual needs