PNI RM3000 Sensor Suites - Manual (Page 20)

PNI Sensor Corporation Doc #1015673 r08
RM3000 & RM2000 Sensor Suite User Manual – July 2012 Page 20 of 41
4 Geomagnetic Sensor Suite Overview & Set-Up
4.1 Overview
Figure 4-1 provides a basic schematic for implementing the RM3000 Sensor Suite in
Standard Mode. The 3D MagIC is at the center of the schematic, as it ties the user’s host
controller, on the left, to the three Geomagnetic Sensors on the right. To implement the
RM2000, simply do not connect the Sen-Z sensor. The 3D MagIC also can operate only one
sensor if desired. Unused sensor connections should remain floating. To implement either
Geomagnetic Sensor Suite in Legacy Mode, the Mode pin (pin #12) should be connected to
DVDD, rather than tied to ground.
Note: RM3000 and RM2000 Geomagnetic Sensor Suites typically are used in compassing
applications, where each channel represents a Cartesian coordinate axis (x, y, or z). For this reason,
the term “axis” generally is used instead of “channel”.
Figure 4-1: RM3000 reference schematic – Standard Mode
The Sen-XY and/or Sen-Z sensors serve as the inductive element in a simple LR relaxation
oscillation circuit which is composed of an external bias resistor along with digital gates and