N40P112 Datasheet, PDF (13/34 Pages) ams AG – Push button feature

EasyPoint^TM N40P112
Datasheet - XY Coordinates Interpretation
Knob on Position 2.
The center of the magnet has been moved upon the horizontal wakeup threshold Xp. The EasyPoint module sets INTn LOW (active). At this
point, the microcontroller can configure the module with INT_function (Reg 0Fh [2]) = 0 and change the Low Power timebase Reg 0Fh [6:4] for a
faster reaction time. In this interrupt mode, the interrupt output goes LOW (active) each time a new X and Y value is ready to be read by the
microcontroller. The interrupt is reseted HIGH (not active) once the register Y_res_int has been read (see I²C Registers on page 23).
Knob on Position 3.
The magnet has been moved to the maximum distance from the center (+1.0mm). The maximum X value is -128 decimal.
9.1.1 Knob Displacement and Register Value Relation
Figure 7 shows the relation between the X register value and the physical X coordinate of the central knob (±1.0mm horizontal displacement,
0.0mm is the center of the module, when the knob is released).
The Y axis measurements are the same as the X axis ones. Positive X register values are the left side knob movements, positive Y register
values are the upper side knob movements.
Those values are in an ideal condition, where the knob takes place over the center position of the N40P112 sensor once released. The zero
position may vary between two N40 modules, and an offset must be applied to X and Y in order to compensate the X,Y coordinates to 0,0 once
the knob is released. More information can be found in chapters 8.2 and 8.3.
Figure 7. X Register / X Displacement (Y=0µm)
Register X output
X - direction
127
-1000
63
0
-500
0
-63
-128
Mechanical Position (µm)
500
1000
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