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RM3100 Evaluation Board User Manual Page 20 of 33

To set the TMRC register, send the register address, 0x0B, followed by the desired

TMRC register value. To read the TMRC register, send 0x8B.

Note: The Cycle Count Registers establish the maximum data rate of the sensors. For instance,

if the cycle count is set to 200

, then the maximum 3-axis update rate is ~430 Hz. If TMRC is set

to 0x92, indicating an update rate of ~600 Hz, the rate established by the cycle count will override

the TMRC request, and the actual update rate will be ~430 Hz.

Table 5-4: CMM Update Rates

TMRC Value

(Hex)

Time Between

Readings

Update

Rate

~1.7 ms

~600 Hz

~3 ms

~300 Hz

~7 ms

~150 Hz

~13 ms

~75 Hz

~27 ms

~37 Hz

~55 ms

~18 Hz

~110 ms

~9 Hz

~220 ms

~4.5 Hz

~440 ms

~2.3 Hz

~0.8 s

~1.2 Hz

~1.6 s

~0.6 Hz

~3.3 s

~0.3 Hz

~6.7 s

~0.015 Hz

~13 s

~0.075 Hz

5.2.2 Alarm Mode

The RM3100 Evaluation Board incorporates an Alarm Mode feature that sets the

ALARM bit to “1” in the CMM register whenever measurement results exceed an

established limit. This feature can be particularly useful for applications where the user’s

device is briefly waking up to take a magnetic field measurement reading and trying to

determine if the field has changed in an appreciable manner.

This is an optional feature and does not need to be implemented. To disable the feature,

the Alarm Lower Limit and Alarm Upper Limit register values should be `“0”, which are

the defaults.

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