Abstract: An electronic engine controller includes a central processing unit (CPU) which controls the operations of the controller and an analog-to-digital (A/D)converter chip which receives analog signals generated by sensors which transmit signals indicative of vehicle and engine operating parameters. The A/D converter chip automatically performs a conversion on certain signals indicative of critical engine operating parameters to generate corresponding digital values upon each engine revolution. These digital values are stored for retrieval by the CPU. Digital values corresponding to other signals are generated and transmitted upon request by the CPU. The A/D converter chip and the CPU are coupled by a serial link which operates under one of several protocols to transmit digital values from the A/D converter chip to the CPU.

Abstract: The assembly includes a heat-conductive plate onto which a pair of circuit modules are mounted, one module on each side of the plate. A continuous piece of flexible material, such as polyimide, forms the substrate for one circuit module, passes around an edge of the plate, and connects to the other circuit module for which it also forms the substrate. Conductors carried by the flexible material interconnect the modules and also connect the modules to external devices via a connector.