The PMIC Cranking Profile Test Plugin
Many automotive PMICs are powered by an automotive battery. They are required to regulate output voltage under a variety of conditions at their input rails, particularly those encountered while cranking the engine. Several industry-standard procedures exist for testing these PMICs for cranking profiles. These standards include ISO 16750-2, ISO 7637-2 and CISPR25 Validation. Each standard specifies several test pulse profiles. The Cranking Profile Test SIVA plugin has been designed to enable the evaluation and characterization of PMICs when subjected to these profiles.
Figure 1. Test Parameters tab in PMIC Cranking Profile Test Plugin for SIVA
Figure 1 shows the Test Parameters tab of the Cranking Profile Test plugin in SIVA. The Test Parameters tab has dropdowns and fields that let the test engineer choose the test pulses defined in various standards and sequence them into a composite waveform applied to the DUT. The graphical representation of the pulse and the editable pulse parameters control lets the test engineer tailor the various portions of the test pulse. The Test Parameters tab also contains features that lets the Test engineer build a Test Pulse Set, which he/she can save to a file or open from an already saved file. There are also controls for specifying the repetition characteristics of the pulse sequence.
The Cranking Profile Test SIVA plugin offers the following features and advantages:
Figure 2. General setup for testing automotive PMIC for compliance with cranking profiles specified in ISO 16750-2.
The SIVA plugin for Cranking Profile Reliability Tests requires the following class of instruments with the overriding requirement that the instruments must be PXI instruments. This is because the stimulus, response and logging aspects need to be synchronized in order to align the timing between multiple modules and also properly analyzing the failures in the context of the stimulus. Below are the PXI-based instruments that are needed to use this plugin:
Input Power to the PMIC:
Configuration Settings for the PMIC:
Monitoring Equipment for the PMIC Output and Input Rails and Test Points:
Electrical Load for the PMIC:
The Cranking Profile Test plugin contains a graphical representation of the cranking profiles in its Test Parameters tab. The test engineer can alter various portions of the cranking pulse using the controls. The test engineer can also choose between cold and warm start profiles. These cranking profile parameters can be saved, recalled and edited. Figure 2. Shows the cold and warm star profiles available in the Cranking Profile Test Plugin.
Figure 3. Cranking profiles and their parameters as seen in the Test Parameters tab of the Cranking Profile Test Plugin. (The cold start profile will be shown on the Test Parameters tab)
Figure 4. shows the Measurements and Test Results tab of the Cranking Profile Test plugin in SIVA. This tab displays the input and output profiles for each test pulse. The graphical display on the Test and Measurements tab shows the input and output signals acquired by the oscilloscopes.
Figure 4. Test and Measurements Tab for the PMIC Cranking Profile Test Plugin in SIVA. The graphical display shows the time course of input and output pulses. The input test pulse shown here is that for the warm start test.
The PMIC Cranking Profile Test plugin takes advantage of the Hardware Abstraction Layer functionality built in to SIVA framework which makes it easy for a test engineer to use measuring instruments from the suite of PXI instruments.
Also available as a separately sold add-on to the PMIC Cranking Profile Test Plugin is DIVE, a waveform tagging, learning and analysis tool that uses Machine Learning Models to simplify the waveform analysis for switching regulator type PMICs. One can train DIVE to classify the waveform scope-shots from the PMIC output terminals as NORMAL or ANOMALOUS or DEFECT1. Some thematic diagrams and screenshots are shown below.
Figure 5. Workflow and Capabilities of DIVE.
Figure 6. PMIC Switching regulator waveform analysis in progress using DIVE.
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