PNI RM3000 Sensor Suites - Manual (Page 38)

PNI Sensor Corporation Doc #1015673 r08
RM3000 & RM2000 Sensor Suite User Manual – July 2012 Page 38 of 41
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 9B
H
on the MISO pin. Once the 8 bits have
clocked in, the 3D MagIC will execute the command (i.e. take a measurement).