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參數(shù)資料
| 型號(hào)： | HMC1055 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 3-AXIS COMPASS SENSOR SET |
| 中文描述： | 3軸指南針傳感器系列 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 406K |
| 代理商： | HMC1055 |
HMC1055
Advance Information
MXS3334UL
SENSOR PRODUCTS
Application Notes
The HMC1055 Chipset is composed of three sensors packaged as integrated circuits for tilt compensated electronic
compass development. These three sensors are composed of a Honeywell HMC1052 two-axis magnetic field sensor,
a Honeywell HMC1051Z one-axis magnetic sensor, and the Memsic MXS3334UL two-axis accelerometer.
Traditionally, compassing is done with a two-axis magnetic sensor held level (perpendicular to the gravitational axis)
to sense the horizontal vector components of the earth’s magnetic field from the south pole to the north pole. By
incorporating a third axis magnetic sensor and the two-axis accelerometer to measure pitch and roll (tilt), the compass
is able to be electronically “gimbaled” and can point to the north pole regardless of level.
The HMC1052 two-axis magnetic sensor contains two Anisotropic Magneto-Resistive (AMR) sensor elements in a
single MSOP-10 package. Each element is a full wheatstone bridge sensor that varies the resistance of the bridge
magneto-resistors in proportion to the vector magnetic field component on its sensitive axis. The two bridges on the
HMC1052 are orientated orthogonal to each other so that a two-dimensional representation of an magnetic field can
be measured. The bridges have a common positive bridge power supply connection (Vb); and with all the bridge
ground connections tied together, form the complete two-axis magnetic sensor. Each bridge has about an 1100-ohm
load resistance, so each bridge will draw several milli-amperes of current from typical digital power supplies. The
bridge output pins will present a differential output voltage in proportion to the exposed magnetic field strength and the
amount of voltage supply across the bridge. Because the total earth’s magnetic field strength is very small (~0.6
gauss), each bridge’s vector component of the earth’s field will even be smaller and yield only a couple milli-volts with
nominal bridge supply values. An instrumentation amplifier circuit; to interface with the differential bridge outputs, and
to amplify the sensor signal by hundreds of times, will then follow each bridge voltage output.
The HMC1051Z is an additional magnetic sensor in an 8-pin SIP package to place the sensor silicon die in a vertical
orientation relative to a Printed Circuit Board (PCB) position. By having the HMC1052 placed flat (horizontal) on the
PCB and the HMC1051Z vertical, all three vector components of the earth’s magnetic field (X, Y, and Z) are sensed.
By having the Z-axis component of the field, the electronic compass can be oriented arbitrarily; and with a tilt sensor,
perform tilt-compensated compass heading measurements as if the PCB where perfectly level.
Solid State Electronics Center
www.magneticsensors.com
(800) 323-8295
Page 7
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