PNI RM3000-F Sensor Suite - Manual (Page 38)

PNI Sensor Corporation Doc #1016102 r04
RM3000-f & RM2000-f Sensor Suite User Manual Page 38
Table 6-1: Legacy Period Select Bits
Period Select Value Cycle Counts PS2 PS1 PS0
0 32 0 0 0
1 64 0 0 1
2 128 0 1 0
3 256 0 1 1
4 512 1 0 0
5 1024 1 0 1
6 2048 1 1 0
7 4096 1 1 1
AS0-AS1: Axis Select
Determines the sensor to be measured.
Table 6-2: Legacy Axis Select Bits
Axis Measured AS1 AS0
No axis measured 0 0
X axis 0 1
Y axis 1 0
Z axis 1 1
6.1.3 Making a Legacy Measurement
The steps to make a sensor measurement are given below. In Legacy Mode, the 3D
MagIC returns the result of a complete forward- reverse measurement of the sensor in a
16 bit 2’s complement format (range: -32768 to 32767). Note this is different from
Standard Mode, where a 24 bit value is returned.
SSN pin is set LOW. (This enables communication with the master device.)
CLEAR pin is set HIGH, then LOW. This is not required, but is optional to
maintain compatibility with the legacy 11096 ASIC.
A command byte is clocked into the 3D MagIC on the MOSI pin. Simultaneously,
the 3D MagIC will present a fixed 0x9B on the MISO pin. Once the 8 bits have
clocked in, the 3D MagIC will execute the command (i.e. take a measurement).