Remote temperature sensor qualified for automotive applications

Texas Instruments’ TMP421-Q1, TMP422-Q1, and TMP423-Q1 devices are single, dual, and triple remote, automotive-qualified temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or field-programmable gate arrays (FPGAs). Remote accuracy is ±1C for multiple device manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device. The devices include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150C), and diode fault detection. They are all available in an eight-pin SOT-23 package.