TLE8242-2 Datasheet, PDF (31/78 Pages) Infineon Technologies AG – 8 Channel Fixed Frequency Constant Current Control With Current Profile Detection

TLE8242-2
Functional Description and Electrical Characteristics
5.8
Current Profile Detection
The TLE8242 will detect current profiles due to the change in inductance caused by the opening/closing of
solenoid valves. Examples of the types of waveforms seen in this instance are shown in Figure 15 and Figure 16.
Examples of waveforms that fail the Current Profile Detection test are shown in Figure 17 and Figure 18.
OUTx Voltage
Measured Current
(Differential Voltage )
Zone 1
Zone 3
Time Out Timer
Timeout for Failure
A/D Samples
Detect Interrupt
Time Out
PASS
Figure 15 Current Profile Diagram - Waveform Showing Valve Movement
OUTx Voltage
Measured Current
(Differential Voltage )
Time Out Timer
Zone 1
Zone 3
Timeout for Failure
A/D Samples
Detect Interrupt
Time Out
PASS
Figure 16 Current Profile Diagram - Waveform Showing Valve Movement with Non-Zero Threshold in
Zone 2
Data Sheet
31
Rev. 1.0, 2010-02-09