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RM3100 & RM2100 Sensor Suite User Manual Page 34 of 45

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

Absolute Alarm Mode

Relative Alarm Mode

ALARM

bit

ALARM

bit

Initial State & Measure

0x0F00

0x10000

0x0A00

0x10000

0x0A00

Perturbation Applied & Measure

0x1100

0x10000

0x0A00

0x10000

0x0A00

Measure Again

0x1100

0x10000

0x0A00

0x12000

0x1000

Measure Again

0x1100

0x10000

0x0A00

0x12000

0x1000

Remove Perturbation& Measure

0x0F00

0x10000

0x0A00

0x12000

0x1000

Measure Again

0x0F00

0x10000

0x0A00

0x10000

0x0A00

Measure Again

0x0F00

0x10000

0x0A00

0x10000

0x0A00

5.3 Initiate a Single Measurement (0x00)

The MagI2C 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 write the POLL address register, 0x00, and

follow this by the POLL register byte which establishes which axes are to be measured. It is

defined as shown below, 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 #

Value

PMZ

PMY

PMX

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 43 44

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