TLE7241E Datasheet, PDF (45/71 Pages) Infineon Technologies AG – Dual Channel Constant Current Control Solenoid Driver

TLE 7241E
Functional Description and Electrical Characteristics
Error Correction
Register #
0
1
2
3
4
Corresponding Average
Current Register Setting
(Hex)
0A6
14D
1F3
29A
340
Corresponding Ideal Average
Current with a 1 Ω ext. Sense
Resistor
200 mA
400 mA
600 mA
800 mA
1000 mA
For example:
• Measured average switch threshold at 0A6_H during Infineon production test = 207 mV
• Ideal average switch threshold at 0A6_H = 199.6 mV
• Error Correction = -7.4 mV / (1.2 mV/count) = -6 counts
• The contents of the error correction register are -6 or FA_H
The contents of the error correction registers can be used by the application
microcontroller to improve the accuracy of the average switch points. In the above
example, when the microcontroller requests an average current of 200 mA (assuming a
1 Ω sense resistor), the command sent should be 0A6 (ideal) - 6 (error correction) = 0A0.
For current commands between the 5 measured operating points, the microprocessor
can use linear (or more complex) interpolation to calculate the appropriate error
correction values.
Data Sheet
45
Rev. 1.1, 2009-01-19