Abstract: Apparatus and associated methods relate to a post temperature calibration translation circuit (PTCTC) configured to generate a signal corresponding to a predetermined temperature voltage translation relationship (TVTR). In an illustrative example, the PTCTC may be coupled to a motor controller including a control logic to regulate a power input to a motor based on the TVTR. The PTCTC further includes an input port configured to receive a temperature sensor output based on a predetermined transfer function. At least one analog corrective translation circuit (ACTC), for example, may generate temperature input signals to the motor power controller based on the temperature sensor output. The temperature input signals are generated based on a calibrated transfer function such that the temperature input signals substantially match an output according to the TVTR. Various embodiments may advantageously avoid modification of the control logic when the predetermined transfer function is altered.

Abstract: A switching transistor is placed between a serial port of a RS232 device and a parallel port of a TTL microcontroller. Selective activation of the switching transistor permits a high voltage signal to be transmitted from the power supply rail of the TTL microcontroller to the RXD pin of the RS232 device, where the signal is interpreted as a logical low. This step takes advantage of the fact that the RS232 standard interprets any voltage received at the RXD pin greater than a receiver threshold value to be a logical low. Selective deactivation of the switching transistor isolates the RS232 port from the non-RS232 device, permitting negative voltage signal output by the TXD pin of the idling RS232 port to be conveyed back to the RS232 port at the RXD pin. This negative voltage signal is interpreted by the RS232 port as a logical high signal.

Abstract: A communication interface circuit transfers signals between a TTL microcontroller and a RS232 device while avoiding level translation. The interface circuit includes two switch elements. A first switch element is connected between the TTL receive terminal and the ground supply. The second switch element includes a first node that is an electrical communication with the TTL transmit data terminal, the RS232 transmit data terminal and the RS232 receive data terminal, a second node in electrical communication with the first TTL power supply and a control node in electrical communication with the TTL receive data terminal. The interface circuit is configurable to a first switching state in which electrically connects the first TTL power supply terminal to the RS 232 receive data terminal.