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Selasa, 24 September 2013

E-Compass │ Consumer Electronics & Mobile Devices │ Electronic Compasses

E-Compass │ Consumer Electronics & Mobile Devices │ Electronic Compasses


The New Generation E-Compass


Electronic compasses are gaining popularity in hand held and mobile devices primarily driven by the need to orient maps.  Electronic compass, generally referred to as e-compass, has the unique ability to orient the map with the viewing direction thus greatly enhancing the user experience. E-compass also allows the mobile device to use any application that requires a geographical directional reference to be useful such as dead-reckoning (DR) navigation and location base services (LBS), two of the most promising applications coming to mobile devices.
E-compasses work by detecting the geo-magnetic components of the location and transforming them to the magnetic north direction. Honeywell offers high accuracy yet low cost magnetic sensor solutions for consumer electronics, mobile devices and netbooks. Our extensive experience in fabricating AMR sensors allows us to develop all-in-one 3-axis magnetic sensor components that are not only smaller in size, lower in power consumption and easier to implement, but also lower in per unit cost. They are specifically designed and priced for today’s fast growing consumer and mobile device market.
Similar to a traditional Honeywell AMR magnetic sensor designs, these new generation magnetic sensors maintain the same quality sensor elements and principle of operation to achieve high sensitivity, high resolution measurements of weak magnetic fields such as the earth’s magnetic field. These new sensors are built in with all supporting electronic circuitry (including set/reset demagnetizing circuit to maintain a superior performance advantage, built-in self test function that saves time and cost in manufacturing, variable gain amplifier to accommodate non-ideal magnetic environment, and a 12-bit ADC, etc.) and provide ready-to-use digital outputs all in one small package. The result is a high quality single-chip solution that can be integrated easily and cost effectively into any system even if the available PCB space is limited.
In tilt-compensated compassing applications commonly implemented in mobile devices, the three-axis magnetic sensor must be complemented by a tilt sensor to measure the gravitational direction. Working side-by-side with a 3-axis magnetic sensor, the tilt sensor provides measurements of pitch and roll angles to complete the 3D compassing solution. Besides the 3-axis magnetic sensor products, Honeywell also provides a compass-in-a-chip solution that combines 3-axis magnetic sensor, 3-axis MEMS accelerometer (as a tilt sensor), supporting ASIC, and a microprocessor with built-in compassing algorithm as an alternative single-chip tilt-compensated compassing solution for mobile devices.
In addition to the best-in-class magnetic sensors, Honeywell also offers engineering support and a complete software library to assist customers with the integration of e-compass applications into their mobile devices. We devote significant amount of our resources to supporting our customers to ensure their success from design to implementation and troubleshooting whenever necessary.
Magnetic Sensors for Consumer Electronics
Consumer Electronics E-CompassHoneywell Precision Sensors offers many all-in-one magnetic sensors for consumer electronics and mobile devices including our newest 3 Axis compass IC, the HMC5883L. The HMC5883L is a 3x3x0.9mm surface mount 16-pin LCC three-axis magnetic sensor with I2C digital output providing three-axis magnetic field strength with resolution of 2 milli-Gauss. This device can enable less than 1ยบ of compass accuracy at level or tilted if complemented by an accurate tilt sensor. Unique features include high resolution, low power consumption, wide measurable range, built-in set/reset, offset canceling, self-test, internal averaging, adjustable gain, single supply mode, and RoHS compliance.


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