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There are very lazy car companies which simply specify "automotive certified" car chips for everything, including MCUs running window switches. So, don't be sur
by baybal2 5y ago
There are very lazy car companies which simply specify "automotive certified" car chips for everything, including MCUs running window switches. So, don't be surprised $20 ARM-R based MCUs being used to do something trivial like driving window motor.
I seen a few dashboard where there is an STM32 sitting connected to a single button, whose only duty is to register a key press, and burp something on the CanBus in response.
- coryrc 5y agoI guarantee you no one is running $20 MCUs in trivial applications (in normal times). They're very cost-conscious.
- hulitu 5y agoEvery component ( resistors, transistors, microcontrollers, etc ) must be Automotive qualified (AEC-Q ). That's how you have a minimum standard. A button cannot communicate on the CAN bus that's why you need the microcontroller.
- kortex 5y agoA) I doubt you need a $20 component to register a key press and do some canbus IO B) If you did have a $20 microcontroller for Canbus control of a window motor driver but it saved $19 in extra wiring/labor (driver controls usually route to all windows), provides reliable debounce, automated one-push-to-open, and allows things like holding keyless lock to close all windows, it's totally worth it.
- sbierwagen 5y agoA big chunk of this crisis was caused by car manufacturers being insanely focused on cost cutting. Doing obviously dumb things with BOM isn't exactly a calling card of the automotive industry.