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應用說明
The Peripheral Sensor Interface 5 (PSI5) serial bus is used in automotive sensor monitoring applications including airbag systems. The PSI5 bus is based on a 2-wire current-modulated interface with Manchester encoding. This interface supplies power to PSI5 intelligent sensors and sensor-to-ECU data transmission is achieved via current modulation over the same 2-wire interface. Though the most common baud rate for PSI5 is 125 kbps, this bus can operate up to 189 kbps.
Keysight’s InfiniiVision X-Series oscilloscopes offer a wide range of licensed application options that allow you to set up the scope to decode and trigger on a wide range complex automotive serial bus communication, including PSI5. Having the ability to synchronize on and decode PSI5 communication will enhance your ability to test, debug, and verify proper bus operation and signal integrity of the physical layer. Triggering on and decoding the PSI5 bus can be accomplished using Keysight’s User-definable Manchester/NRZ Trigger and Decode option (DSOXT3NRZ/DSOX4NRZ/DSOX6NRZ).
This application note provides an overview of the structure of the PSI5 protocol/bit timing, followed by step-by-step instructions on how to set up an InfiniiVision oscilloscope to decode then trigger on a PSI5 serial bus.
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