HMC5883L View Datasheet(PDF) - Honeywell International
Part Name
Description
Manufacturer
HMC5883L Datasheet PDF : 18 Pages
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HMC5883L
SCALE FACTOR CALIBRATION
Using the self test method described above, the user can scale sensors’ sensitivity to match each other. Since placing
device in positive bias mode (or alternatively negative bias mode) applies a known artificial field on all three axes, the
resulting ADC measurements in data output registers can be used to scale the sensors. For example, if the expected self
test value for X-axis is 766 and the actual value is 750 then a scale factor of (766/750) should be multiplied to all future
readings of X-axis. Doing so for all three axes will ensure their sensitivity are well matched,
The built-in self test can also be used to periodically compensate the scaling errors due to temperature variations. A
compensation factor can be found by comparing the self test outputs with the ones obtained at a known temperature. For
example, if the self test output is 750 at room temperature and 700 at the current temperature then a compensation factor
of (750/700) should be applied to all current magnetic readings. A temperature sensor is not required using this method.
EXTERNAL CAPACITORS
The two external capacitors should be ceramic type construction with low ESR characteristics. The exact ESR values are
not critical but values less than 200 milli-ohms are recommended. Reservoir capacitor C1 is nominally 4.7 µF in
capacitance, with the set/reset capacitor C2 nominally 0.22 µF in capacitance. Low ESR characteristics may not be in
many small SMT ceramic capacitors (0402), so be prepared to up-size the capacitors to gain Low ESR characteristics.
ORDERING INFORMATION
Ordering Number
Product
HMC5883L-TR
Tape and Reel 4k pieces/reel
FIND OUT MORE
For more information on Honeywell’s Magnetic Sensors visit us online at www.honeywell.com/magneticsensors or contact
us at 800-323-8295 (763-954-2474 internationally).
The application circuits herein constitute typical usage and interface of Honeywell product. Honeywell does not warranty or assume liability of customer-
designed circuits derived from this description or depiction.
Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
U.S. Patents 4,441,072, 4,533,872, 4,569,742, 4,681,812, 4,847,584 and 6,529,114 apply to the technology described
Honeywell
12001 Highway 55
Plymouth, MN 55441
Tel: 800-323-8295
w18ww.honeywell.com/magneticsensors
Form # 900405 Rev B
October 2010
©2010 Honeywell International Inc.
www.honeywell.com
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