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pulse Universal temperature sensor IC linearises data to 0.1°C accuracy LTC2983 is a high performance digital temperature measurement IC which directly digitises RTDs, thermocouples, thermistors and external diodes with 0.1°C accuracy and 0.001°C resolution. A high performance analogue front end combines low noise and low offset buffered ADCs with all the necessary excitation and control circuits for each sensor. Measurements are performed under the control of a digital engine combining all the algorithms and linearisation required for each. The LTC2983 provides a multiplexed high precision interface to virtually any sensor. It precisely measures absolute microvolt level signals from thermocouples and ratiometric resistance measurements from RTDs and thermistors, linearises the results and outputs the results in °C or °F. Up to twenty analogue inputs are available. The SPI interface works with virtually any digital system and a comprehensive software support system with drop-down menus allows easy customising of the IC. LTC2983 interfaces with a wide variety of temperature sensors, including type B, E, J, K, N, S, R, T thermocouples, 2,3, or 4-wire RTDs, 2.25 kΩ to 30 kΩ thermistors and temperaturesensing diodes. It works with ground-referenced sensors without the need for amplifiers, negative supplies, or level shift circuitry. Signals are simultaneously digitised with three, high accuracy, 24-bit ΔΣ ADCs using an internal 10ppm/°C reference. Automatic thermocouple cold junction compensation can be done using any type of external sensor. Included on the chip are linearisation algorithms for all common sensor types. Custom sensors can be linearised with custom coefficients programmed into the chip. 10-W wireless power delivery promises faster, cooler charging without plugging in TI’s receiver and transmitter system efficiently charges one- and two-cell battery-powered applications, and supports any Qi-compatible 5-W wireless charging system. Claimed as the first fully integrated 10-W wireless charging receiver and corresponding transmitter, the bq51025 and bq500215 enable waterproof and dustproof portable designs and provide a faster, cooler charge to one- and two-cell (1S and 2S) Li-Ion batteries. The charging solution is also compatible with any 5-W Qi-compliant product in the market – allowing consumers the flexibility to charge in more places. The bq51025 receiver supports a programmable output voltage of 4.5 to 10 V and achieves up to 84% charging efficiency at 10-W when paired with TI’s bq500215 wireless Complete article, here power transmitter, significantly improving thermal performance. The fully-contained wireless power receiver solution measures 3.60 by 2.89 mm, and can be designed into many portable industrial designs. The bq500215 is a dedicated, fixed-frequency 10-W wireless power digital controller transmitter compatible with 5-W Qi receivers. The transmitter features an enhanced foreign object detection (FOD) method that detects objects before any power is transferred, and actively reduces power if excessive loss is detected. Qi-compliant communications and control ensures compatibility with any Wireless Power Consortium Qi-certified transmitter or receiver up to 5W. Complete article, here Microchip’s 5V “EV” dsPIC33 MCUs offer enhanced noise immunity, ECC flash Microchip has added a family of 16-bit dsPIC33 Digital Signal Controllers (DSC), the dsPIC33 "EV" family, that has 5V operation for improved noise immunity and robustness, for devices operating in harsh environments such as appliance and automotive applications. The dsPIC33EV family is the first dsPIC DSC with Error Correcting Code (ECC) flash for increased reliability and safety. For safety-critical applications, the dsPIC33EV devices also include CRC, Deadman Timer (DMT), and Windowed Watchdog Timer (WWDT) peripherals as well as a backup system oscillator and certified Class B software. Other features of this family include up to six advanced motor control PWMs, 12-bit ADC, and operational amplifiers, a combination configured for motor control applications. The dsPIC33EV devices provide interface to 5V automotive sensors such as level or flow sensing, with improved noise immunity and enhanced reliability, and provide performance to execute smart sensor filter algorithms and integrate CAN communication software. Complete article, here www.edn-europe.com EDN Europe | DECEMBER 2014 9


EDNE DEC 2014
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