MLX90277EGOSR0-0 MELEXIS [Melexis Microelectronic Systems], MLX90277EGOSR0-0 Datasheet - Page 9

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

The MLX90277 sensors also have an additional stage, Fine Gain, for fine tuning the Sensitivity. The stage
(parameter FG) follows the RG and provides a 10 bit adjustment. The small signal gain of the FG is within
1.0 and 2.5. The RG and FG parameters are adjusted in the application to calibrate the sensitivity (gain) and
output slope transfer characteristic of the device. The function for the fine gain is given in the following
equation:
Note. The one bit parameter INVERT is used to fix the “sign” of the sensitivity. A value of 0 makes the gain
positive and the output voltage increases in response to a South magnetic field. A value of 1 makes the gain
negative and the output voltage decrease in response to a South magnetic field. Refer to section 10.5,
Sensitivity Polarity for more information on INVERT.
Each unit is characterized over temperature during final test to optimize its performance and accuracy. To
achieve the best possible Sensitivity Temperature Compensation, TempCo., each unit is optimized for use
within a specific Sensitivity range. This is represented in the ordering information by the option code. There
are four available ranges, option codes 0, 1, 2 and 3. The option code corresponds with the two MSB of the
RG parameter. Each device is tested to meet the TempCo specification in the Sensitivity range determined
by the RG parameter (RG = 0…3, RG = 4…7, RG = 8...11 or RG = 12…15), regardless of the FG parameter.
The Sensitivity range is selected independently for Sensor A and Sensor B. Melexis may limit the available
combinations.
Table 9: Optimized Sensitivity Range
The next figures show the typical Sensitivity versus the FG and RG parameters. The gray areas are
representative of the chip to chip dispersion (i.e.: for the same RG and FG parameters, the Sensitivity can
vary from chip to chip). There is large overlap between the different ranges for use of one range for
applications with large magnetic and/or mechanical dispersions. The Sensitivity graphs and tables can be
used to select the right device type for the application. If one is unsure of the application’s magnetic design
and the desired Sensitivity range Melexis recommends option code 2.
3901090277
Rev 004
Option Code
10.4 Sensitivity Range Selection
0
1
2
3
Rough Gain
12-15 (11 xx)
8-11 (10 xx)
0-3 (00 xx)
4-7 (01 xx)
Sensitivity Range
(mV/mT)
Fine
50 < S < 210
2.6 < S < 15
10 < S < 35
18 < S < 90
Gain
Page 9 of 21
Dual Programmable Linear Hall Effect Sensor
=
1
−
0
6 .
1
Typical Magnetic Field Range
(mT, B
*
1023
FG
MAX
333 < B < 800
156 < B < 333
62 < B < 156
6 < B < 62
- B
MIN
)
MLX90277
Data Sheet
Nov/06