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For LIN, we would probably use an STM32F030 STM32F031 (Cortex-M0) or STM32L011 STM32L031 (Cortex-M0+) and LIN transceiver. Since LIN is a 1-wire interface, we only need 3 wires. However, we may want to add 2 wires to enable auto-addressing. We could use much cheaper ADCs since we don't have the addressing requirement. We could even use an analog optoisolator with the MCU's built-in ADC, although it may be very close price-wise for a digital isolator + ADC. That needs to be investigated more. We could probably get a ~$3 digital isolator and a ~$2 8~10-bit ADC.

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