HMC5843 3-Axis Electronic Compass <ul><li>Source: Honeywell </li></ul>
Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce HMC5843 3-Axis electronic compass solution. </li></ul></ul...
Electronic Compassing Solution <ul><li>Two-axis magnetic compasses </li></ul><ul><ul><li>X and Y-axis sensors </li></ul></...
HMC5843 3-Axis Solution <ul><li>Digital compassing solution for cost sensitive designs </li></ul><ul><li>3 axis magnetic s...
Why Choose HMC5843? <ul><li>Small size for highly integrated products </li></ul><ul><ul><li>Popular two-wire serial data i...
Applications <ul><li>GPS Enabled Mobile Phones </li></ul><ul><li>Personal Navigation Devices </li></ul><ul><li>Wireless Mi...
Block Diagram
Anisotropic Magneto-resistive (AMR) Sensors <ul><li>AMR sensors can sense DC static fields as well as the strength and dir...
I 2 C Interface The HMC5843 is connected to this bus as a slave device under the control of a master device.
HMC5843 Demo Board <ul><li>HMC5843 plus serial bus conversion circuits to convert the I 2 C data to USB interfacing to per...
HMC5843 Evaluation Board <ul><li>0.8” by 0.8” plug board with wide DIP spaced pin for solderless breadboard compatibility ...
Additional Resource <ul><li>For ordering HMC5843 devices, please click the part list or </li></ul><ul><li>Call our sales h...
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HMC5843 3-Axis Electronic Compass

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  • Welcome to the training module on HMC5843 3-Axis Electronic Compass.
  • This training module will introduce HMC5843 3-Axis electronic compass solution.
  • The earth&apos;s magnetic field is about 0.6 gauss in an open-air environment, and has a direction from the magnetic south pole to the magnetic north pole. This pointing to the north pole is the basis for magnetic compassing. At the equator, the magnetic field direction is entirely a horizontal vector, but as you compass further into the northern or southern hemispheres the magnetic field will point partially downwards (northern hemisphere) or upwards (southern hemisphere). This angle down or up at the earth&apos;s surface is called the inclination (dip) angle. The high compassing solutions benefit for personal, vehicle, aircraft, and marine navigation. Honeywell offers two-axis magnetic compass and three-axis magnetic compass solutions. The two-axis solution measures the horizontal vector components of the earth&apos;s magnetic field using two sensor elements in the horizontal plane but orthogonal to each other. The three-axis magnetic compasses contain magnetic sensors in all three orthogonal vectors of an electronic compass assembly to capture the horizontal and vertical components of the earth&apos;s magnetic field.
  • The Honeywell HMC5843 is a surface mount multi-chip module designed for low field magnetic sensing with a digital interface for applications such as low cost compassing and magnetometry. The HMC5843 includes 1043 series magneto-resistive sensors plus Honeywell developed ASIC containing amplification, strap drivers, offset cancellation, 12-bit ADC and an I 2 C serial bus interface. The device can be operated in three mode, sleep, standby and normal operation mode, which makes it suitable for battery powered applications.
  • The HMC5843 is a highly integrated solution in a small package size, which makes it easy to use, just adding a microcontroller interface and two SMT capacitors. It utilizes Honeywell’s Anisotropic Magneto-resistive (AMR) technology. The sensors feature precision in-axis sensitivity and linearity, solid-state construction with very low cross-axis sensitivity designed to measure both direction and magnitude of Earth’s magnetic fields, from tens of micro-gauss to 6 gauss. The low voltage operations enable it for battery powered applications. Set/Reset and offset strap drivers for degaussing, self test, and offset compensation. The stand QFN package makes it easy to assembly and compatible with high speed SMT assembly.
  • The HMC5843 is designed to improve accuracy and location readings in consumer electronics applications including mobile phones, personal navigation systems and portable automotive navigation systems. The chip increases functionality in consumer electronics by providing expanded direction awareness when overlaid on GPS-enabled maps, making it easier to read digital maps on handheld devices. It is also suitable for other high volume, cost sensitive applications, like GPS enabled wireless phone and handheld GPS receivers.
  • Here shows the block diagram of the HMC5843. The magnetoresistive sensor circuit is a trio of sensors and application specific support circuits to measure magnetic fields. With power supply applied, the sensor converts any incident magnetic field in the sensitive axis directions to a differential voltage output. These signals are multiplexed into the amplifier and sent to ADC. Finally, the control logic block controls the system clock, serial bus interface, and measurement modes. The H-Bridge contains large switching FETs capable of delivering a large but brief pulse to the Set / Reset strap of the sensor. The bias current generator is used to apply a bias current to the offset strap of the magneto-resistive sensor, which creates an artificial magnetic field bias on the sensor. An internal voltage regulator, depending on the application needs, may be used instead of supplying voltage to pin DVDD.
  • The anisotropic magneto-resistive (AMR) sensor is one type that lends itself well to the earth’s field sensing range. AMR sensors can sense DC static fields as well as the strength and direction of the field. This sensor is made of a nickel-iron thin film deposited on a silicon wafer and is patterned as a resistive strip. The properties of the AMR thin film cause it to change resistance by 2-3% in the presence of a magnetic field. Typically, four of these resistors are connected in a Wheatstone bridge configuration shown in the figure so that both magnitude and direction of a field along a single axis can be measured. The reaction of the magneto-resistive effect is very fast and not limited by coils or oscillating frequencies. The key benefit of AMR sensors is they can be bulk manufactured on silicon wafers and mounted in commercial integrated circuit packages. This allows magnetic sensors to be auto-assembled with other circuit and systems components.
  • Control of the HMC5843 is carried out via the I 2 C bus. This device will be connected to this bus as a slave device under the control of a master device, such as the processor. Here shows the typical connection between HMC5843 and an MCU. This device shall support standard and fast modes, 100kHz and 400kHz respectively, but cannot support the high speed mode (Hs). External pull-up resistors are required to support these standard and fast speed modes. Depending on the application, the internal pull-ups may be used to support slower data speeds than specified by I 2 C standards.
  • The demonstration board for the 3-axis Compass IC provides the HMC5843 plus serial bus conversion circuits to convert the I2C data to USB interfacing for personal computers. Includes a 6-foot USB cable, software, user manual &amp; 5 samples of the HMC5843.
  • The HMC5843 evaluation board for the Compass IC contains the HMC5843 atop a 0.8&amp;quot; by 0.8&amp;quot; plug-board with wide-DIP spaced (0.6&amp;quot;) pins for solderless breadboard compatibility. The evaluation board also contains the two capacitors and I 2 C pull up resistors needed for typical function for the retrieval of the XYZ magnetic field information. Both single and dual supply configurations of the HMC5843 are supported
  • Thank you for taking the time to view this presentation on “ HMC5843 3-Axis Electronic Compass” . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link right beside the play button on the TechCast portal, or simply call our sales hotline. For more technical information you may either visit the Honeywell site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit element14 e-community to post your questions.
  • HMC5843 3-Axis Electronic Compass

    1. 1. HMC5843 3-Axis Electronic Compass <ul><li>Source: Honeywell </li></ul>
    2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce HMC5843 3-Axis electronic compass solution. </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Honeywell electronic compassing solution </li></ul></ul><ul><ul><li>Overview HMC5843 compass IC and its key benefits </li></ul></ul><ul><ul><li>Target applications </li></ul></ul><ul><ul><li>Internal operations and development tools </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>12 pages </li></ul></ul>
    3. 3. Electronic Compassing Solution <ul><li>Two-axis magnetic compasses </li></ul><ul><ul><li>X and Y-axis sensors </li></ul></ul><ul><ul><li>Measures the horizontal vector components of the earth's magnetic field using two sensor elements in the horizontal plane but orthogonal to each other </li></ul></ul><ul><ul><li>To remain accurate, they must remain horizontal, or orthogonal to the gravitational (downward) vector. </li></ul></ul><ul><li>Three-axis magnetic compasses </li></ul><ul><ul><li>X, Y and Z-axis sensors </li></ul></ul><ul><ul><li>Contain magnetic sensors in all three orthogonal vectors of an electronic compass assembly to capture the horizontal and vertical components of the earth's magnetic field </li></ul></ul>
    4. 4. HMC5843 3-Axis Solution <ul><li>Digital compassing solution for cost sensitive designs </li></ul><ul><li>3 axis magnetic sensors and an ASIC in a single package </li></ul><ul><li>I 2 C serial bus interface </li></ul><ul><li>12-bit analog-to-digital converter </li></ul><ul><li>Offset and Set-Reset / De-gaussing Straps </li></ul><ul><li>Adjustable Gain Settings </li></ul><ul><li>Sleep, standby & operating mode supported </li></ul><ul><li>4 x 4 x 1.3mm 20-pin QFN Package </li></ul>
    5. 5. Why Choose HMC5843? <ul><li>Small size for highly integrated products </li></ul><ul><ul><li>Popular two-wire serial data interface </li></ul></ul><ul><ul><li>Add a microcontroller interface, plus two external SMT capacitors </li></ul></ul><ul><li>Sensors can be used in strong magnetic field environments </li></ul><ul><li>Compatible for battery powered applications </li></ul><ul><li>Allows for single or dual supply operation for flexibility into system designs </li></ul><ul><li>Set/Reset and offset strap drivers for degaussing, self test, and offset compensation </li></ul><ul><li>Easy to assemble & compatible with high speed SMT assembly </li></ul><ul><li>Designed for high volume, cost sensitive OEM designs </li></ul>
    6. 6. Applications <ul><li>GPS Enabled Mobile Phones </li></ul><ul><li>Personal Navigation Devices </li></ul><ul><li>Wireless Mice & Pointers </li></ul><ul><li>Sports Watches & Dive Computers </li></ul><ul><li>Game Controllers </li></ul>
    7. 7. Block Diagram
    8. 8. Anisotropic Magneto-resistive (AMR) Sensors <ul><li>AMR sensors can sense DC static fields as well as the strength and direction of the field. </li></ul><ul><li>The reaction of the magneto-resistive effect is very fast and not limited by coils or oscillating frequencies. </li></ul><ul><ul><li>It can be mounted in commercial integrated circuit packages. </li></ul></ul><ul><li>AMR sensors provide an excellent means of measuring both linear and angular position and displacement in the earth’s magnetic field. </li></ul><ul><li>They provide highly predictable outputs when subjected to magnetic fields. </li></ul>
    9. 9. I 2 C Interface The HMC5843 is connected to this bus as a slave device under the control of a master device.
    10. 10. HMC5843 Demo Board <ul><li>HMC5843 plus serial bus conversion circuits to convert the I 2 C data to USB interfacing to personal computers </li></ul><ul><li>Small printed circuit board with USB power supply from the host computer and a green LED indicates power </li></ul><ul><li>6-foot USB cable </li></ul><ul><li>Windows based demonstration software </li></ul><ul><ul><li>Provides a user friendly way of viewing compass heading, pitch and roll data both numerically and on aviation-type displays. </li></ul></ul><ul><ul><li>Communication can still be enabled with the HMC5843, even without the provided demonstration software, as long as the developer creates a program to emulate the I 2 C data packets. </li></ul></ul><ul><li>User guide </li></ul><ul><li>5 product samples </li></ul>
    11. 11. HMC5843 Evaluation Board <ul><li>0.8” by 0.8” plug board with wide DIP spaced pin for solderless breadboard compatibility </li></ul><ul><li>2 capacitors </li></ul><ul><li>2 I 2 C pull-up resistors </li></ul>Pull up resistors
    12. 12. Additional Resource <ul><li>For ordering HMC5843 devices, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>HMC5843 3-Axis Digital Compass IC </li></ul></ul><ul><li>Visit element14 to post your question </li></ul><ul><ul><li> www.element-14.com </li></ul></ul><ul><li>For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility </li></ul>

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