MLX90277EGOSR0-0 MELEXIS [Melexis Microelectronic Systems], MLX90277EGOSR0-0 Datasheet - Page 11

• Manufacturer Part Number: MLX90277EGOSR0-0
• Description: Dual Programmable Linear Hall Effect Sensor
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

The slope transfer characteristic defines the Sensitivity. The INVERT parameter changes the Sensitivity's
polarity, or the slope's direction. This allows the device to accommodate the application requirements and
the magnet's polarity. The slope is inverted in the first stage of the IC, at the Hall Plate. With INVERT set to 0,
the output voltage increases as a South magnetic field is applied and decreases in the presence of a North
magnetic field. An INVERT value of 1 causes the output voltage to increase in the presence of a North
magnetic field and decrease in the presence of a South magnetic field.
referenced to the field component perpendicular to the top-face of the MLX90277.
Two independent values, called the clamping levels, can limit the output voltage range or swing. The
CLAMPLOW parameter adjusts the minimum output voltage level, ClampLo. The CLAMPHIGH sets the
maximum output voltage level, ClampHi. Both parameters have 10 bits of adjustment with a resolution of
approximately 0.005V. The formulas below give a close approximation of the output clamp voltage. The
actual clamping level formulas vary slightly from chip to chip. If CLAMPLOW exceeds CLAMPHIGH the
output voltage is fixed at the high clamp voltage level. The CLAMPHIGH and CLAMPLOW initial value of 768
for IC_A, set by Melexis, results in a fixed output voltage of approximately 76% V
CLAMPLOW initial value of 256 for IC_B, set by Melexis, results in a fixed output voltage of approximately
25% V
At the point the output voltage switches between the linear operating region and the clamping region the
output can deviate slightly. This is represented by the grey areas in the figure below. The limits for deviation
in the Y axis are listed in Table 10. The deviation in the X axis is calculated from the application's transfer
function. The Clamp Comparator Offset does not effect the output linearity or clamp voltage accuracy.
During calibration it is recommended to set the clamp voltage outside of the transition region (0V to 5V).
Figure 10.6 Output Voltage Clamping Deviation
DC operating parameters at V
range (E or L).
Table 10: Clamp Comparator Offset Specification
3901090277
Rev 004
Parameter
10.5 Sensitivity Polarity (INVERT)
10.6 Clamping Levels (CLAMPLOW, CLAMPHIGH)
DD
ClampLo
ClampHi
.
=
=
. 5
. 5
1023
1023
10
10
V
V
∗
∗
Symbol
CLAMP
DD
CLAMPHIGH
CLAMPLOW
= 5V (unless otherwise specified) and for T
OFF
Test Conditions
° C to
V
V
Page 11 of 21
DD
DD
=
=
Dual Programmable Linear Hall Effect Sensor
. 5
. 5
°C
00
00
V
V
Min
A
as specified by the temperature
The magnetic field polarity is
Typical Max
MLX90277
DD
. The CLAMPHIGH and
Data Sheet
Units
Nov/06