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Solutions suit AMR sensors for contactless position sensing

Posted: 14 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:contactless sensing? MCU? sensor?

Maxim Integrated Products has introduced the newest members of its RISC MAXQ MCU product line: the MAXQ7665/MAXQ7666 SoC, mixed-signal MCUs for sensor applications. Designed for use with anisotropic magnetoresistive (AMR) sensors, the devices provide a complete system solution for the contactless sensing of linear or angular position/displacement.

Requiring only 7mm x 7mm of board space, these compact MCUs integrate all of the functions needed to accurately measure the low-amplitude signals of AMR sensors, and provide analog and/or digital outputs. Designed to digitize and process signals in harsh, space-constrained environments, the MAXQ7665/MAXQ7666 are suitable for automotive applications such as steering, braking and throttle position control, as well as industrial control applications such as valve positioning and shaft rotation.

The MAXQ7665/MAXQ7666 feature an 8-channel differential input, followed by a programmable-gain amplifier (up to 32x) and a 12bit, 500KSps ADC. These devices digitize sensor outputs with an accuracy of up to 8?V, enabling very precise real-world measurements. To ensure precision during operation, the MAXQ7665/MAXQ7666 feature both local-die and remote temperature sensing, which allow for temperature compensation of the sensor output. These devices also monitor the supply-rail voltage to respond to power-failure conditions, and they integrate a watchdog timer and three timers with input-capture and output-compare capabilities to ensure reliable operation.

The MAXQ7665/MAXQ7666 embed a 16bit RISC MAXQ MCU core, which is enhanced by a 16 x 16 hardware multiplier and 48bit accumulator. The devices can process digitized data and execute user applications at up to 1MIPS per MHz, while consuming only 0.25mA per MIPS. In addition to integrating 512bytes of SRAM for data, the MAXQ7665 offers 64kB and the MAXQ7666 offers 16kB of automotive-grade flash memory. Both analog and digital outputs are available from either an on-chip 12bit voltage DAC with a buffered output, a UART port (for LIN 2.0 communication), eight general-purpose I/Os or a CAN 2.0B-compliant interface.

The MAXQ7665/MAXQ7666 are available in a space-saving 7mm x 7mm 48-pin TQFN package and are fully specified over the -40C to 125C automotive temperature range.

Prices start at $7.83 for the MAXQ7665 and $7.49 for the MAXQ7666 (1,000-up, FOB USA). An evaluation kit is available to speed designs. The kit includes an evaluation board and a PC-based integrated development environment (IDE). The IDE provides a debugger, assembler/linker, a time-limited version of the IAR C compiler, and a simulator. Maxim's Website offers many application notes and software examples to use with the evaluation kit.

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