PNI RM3000 Sensor Suites - Manual (Page 31)

RM3000 & RM2000 Sensor Suite User Manual r08 Page 31 of 41
Send 0 (value for the MSB for the X axis)
Send 64
H
(value for the LSB for the X axis - pointer automatically increments)
Send 0 (value for the MSB for the Y axis - pointer automatically increments)
Send 64
H
(value for the LSB for the Y axis - pointer automatically increments)
Send 0 (value for the MSB for the Z axis - pointer automatically increments)
Send 64
H
(value for the LSB for the Z axis - pointer automatically increments)
Set SSN to HIGH
5.2 Single-Axis Measurement (SAM) Operation
The SAM Command Byte initiates a sensor measurement on a single sensor, and sets up the
3D MagIC to output the measured values on the MISO line. Generally SAM operation is not
as efficient as MAM operation, except when only one sensor (in total) is to be measured.
5.2.1 SAM SPI Activity Sequence
The SPI activity sequence for SAM operation is given below. SPI timing is discussed in
Section 4.4. The Return Byte is 9A
H
. Three (3) data bytes will be clocked out for a
single-axis measurement. The Command Byte is discussed below.
Figure 5-1: SPI Activity Sequence Diagram for SAM Operation