Abstract: A low-cost compact ignition sense and control circuit is powered by a battery supply line of a vehicle and receives an ignition input signal indicating the turning ON/OFF of a vehicle. Responsive to the ignition input signal, the ignition sense and control circuit utilizes first and second MOSFETS to control an ON/OFF state of a main internal power supply of an ECU or to control an activate/deactivate state of a microprocessor of the ECU. When the MOSFETS are ON, voltage from the battery supply line is used to either latch the main internal power supply of the ECU to an ON state or to latch the microprocessor of the ECU into an ON state. An OFF signal at the ignition input signal releases the latch to provide a shutdown of the main internal power supply or microprocessor.

Abstract: A microelectromechanical system (MEMS) oscillator is used in a high temperature radio frequency (RF) transceiver (e.g., a high temperature wireless transceiver) to overcome high temperature limitations of a standard RF transceiver that utilizes a crystal oscillator. The design of the high temperature RF transceiver enables it to operate at a junction temperature of up to 125 degrees Celsius making it suitable to applications where an ambient temperature of up to 105 degrees Celsius occurs. Example applications include those where the high temperature RF transceiver is mounted on a hydraulic valve, on a hydraulic valve manifold, on or a near an engine, or on a chassis of an automotive vehicle or off-road automotive vehicle.