PNI RM3100 Evaluation Board - Manual (Page 24)

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RM3100 Evaluation Board User Manual Page 23 of 33
case only the X axis sensor is being monitored, the ALLX register is set to 0x0A00,
the AULX register is set to 0x1000, and the ADLX register is set to 0x0100.
Table 5-7: Absolute vs. Relative Alarm Mode Example
State Description MX
Absolute Alarm Mode Relative Alarm Mode
UL LL
ALARM
bit
UL LL
ALARM
bit
Initial State & Measure 0x0F00 0x10000 0x0A00 0 0x10000 0x0A00 0
Perturbation Applied & Measure 0x1100 0x10000 0x0A00 1 0x10000 0x0A00 1
Measure Again 0x1100 0x10000 0x0A00 1 0x12000 0x1000 0
Measure Again 0x1100 0x10000 0x0A00 1 0x12000 0x1000 0
Remove Perturbation& Measure 0x0F00 0x10000 0x0A00 0 0x12000 0x1000 1
Measure Again 0x0F00 0x10000 0x0A00 0 0x10000 0x0A00 0
Measure Again 0x0F00 0x10000 0x0A00 0 0x10000 0x0A00 0
5.3 Initiate a Single Measurement (0x00)
The RM3100 Evaluation Board can operate in either a continuous measurement mode or a
polling mode. This section discusses the Single Measurement Command used in a polling
mode. See Section 5.2 for operation in continuous measurement mode.
To make a single measurement it is necessary to send the Single Measurement Command
byte to the POLL register, 0x00. This byte establishes which axes are to be measured. It is
defined as follows, where a “1” for PMX, PMY, and/or PMZ indicates the X, Y, and/or Z
axis, respectively, is to be measured. Note that the DRDY line will go HIGH after all
measurements requested in the Single Measurement Command byte have been completed.
Bit # 7 6 5 4 3 2 1 0
Value 0 PMZ PMY PMX 0 0 0 0