HMC1053【PDF 7/11 页】SENSOR MAGNETIC 3-AXIS 16-PLCC

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HMC1051/HMC1052/HMC1053

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current of 400mA for reset or set pulses. With rare exception, the set/reset strap must be used to periodically condition the

magnetic domains of the magneto-resistive elements for best and reliable performance.

A set pulse is defined as a positive pulse current entering the S/R+ strap connection. The successful result would be the

magnetic domains aligned in a forward easy-axis direction so that the sensor bridges polarity is a positive slope with

positive fields on the sensitive axis result in positive voltages across the bridge output connections.

A reset pulse is defined as a negative pulse current entering the S/R+ strap connection. The successful result would be

the magnetic domains aligned in a reverse easy-axis direction so that sensor bridges polarity is a negative slope with

positive fields on the sensitive axis result in negative voltages across the bridge output connections.

Typically a reset pulse is sent first, followed by a set pulse a

few milliseconds later. By shoving the magnetic domains in

completely opposite directions, any prior magnetic disturbances

are likely to be completely erased by the duet of pulses. For

simpler circuits with less critical requirements for noise and

accuracy, a single polarity pulse circuit may be employed (all

sets or all resets). With these uni-polar pulses, several pulses

together become close in performance to a set/reset pulse

circuit. Figure 1 shows a quick and dirty manual pulse circuit for

uni-polar application of pulses to the set/reset strap.

APPLICATION NOTES

Low Cost 2-Axis Compass

Very high precision measurements can be made using the HMC105X family of sensors when interfaced with low noise

amplifiers and 12 to 16-bit Analog-to-Digital (A/D) converters. For lower resolution (3?accuracy or more) or low cost

compass applications, 8 or 10-bit A/D converters may be used with general purpose operational amplifiers. Figure 2

shows a typical 2-axis compassing application using readily available off-the-shelf components.

The basic principle of two-axis compassing is to orient the two sensor bridge elements horizontal to the ground

(perpendicular to the gravitational field) and to measure the resulting X and Y analog output voltages. With the amplified

sensor bridge voltages near-simultaneously converted (measured) to their digital equivalents, the arc-tangent Y/X can be

computed to derive the heading information relative to the X-axis sensitive direction. See the application notes on

compassing at Honeywell Magnetic Sensors website (www.magneticsensors.com) for basic principles and detailed

application information.

Figure 1

Set Pulse Circuit

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Figure 2

Two-Axis Compass

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