MLX90277EGOSR0-0 MELEXIS [Melexis Microelectronic Systems], MLX90277EGOSR0-0 Datasheet - Page 12

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

Each die of the MLX90277 includes two programmable low-pass filters located within the chopper amplifier
stages. The two low-pass filters are controlled through a 4 bit parameter, FILTER. The FILTER value 0
corresponds to minimum filtering, maximum speed (impulse response time), and maximum output noise. The
value 15 provides the maximum filtering, minimum speed, and minimum output noise. It is important to note
the noise is also linked to the gain settings. The FILTER parameter needs to be adjusted to achieve optimal
performance. The next table shows typical values of the cut-off frequency at -3 dB versus FILTER and RG
parameters. FILTER values from 8 to 11 are not used. For most applications FILTER values 7 or 15 are
recommended.
Cut-off frequency at -3 dB (Hz) – Typical
Table 11: Cut-off Frequency versus FILTER and RG Parameters
The change in the device's Sensitivity versus temperature is defined as the Sensitivity Temperature
Compensation, TempCo.
temperature. Fluctuations in temperature can cause variations in the air gap, mechanical alignment and
magnetic field. The Sensitivity Temperature Compensation feature compensates for these effects.
Three parameters, TC, TCW, TC
TempCo range, TC is for fine adjustment of the TempCo value, and TC
To simplify use of these parameters Melexis stores a look up table within the EEPROM of each device. The
look up table is optimized for each device by characterizing the unit over temperature at final test.
3901090277
Rev 004
Filter
10.7 Filter (FILTER)
10.8 Sensitivity Temperature Compensation (TC, TCW, TC
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
MLX90277 SR0
Rough Gain 0…3
22900
19500
12300
10400
7450
5850
5700
5050
2200
1000
920
800
In an application the slope output transfer characteristic is often affected by
2
are used for adjustment of the TempCo. The TCW is used to adjust the
MLX90277 SR1
Rough Gain 4…7
14300
11450
10000
6750
3900
2900
2700
2550
840
480
380
330
Page 12 of 21
Dual Programmable Linear Hall Effect Sensor
Not used
Not used
Not used
Not used
MLX90277 SR2
Rough Gain 8…11
7000
5550
3000
2100
1500
1125
1350
1380
565
470
290
250
2
effects the TempCo linear response.
2
)
MLX90277 SR3
Rough Gain 12…15
MLX90277
3850
2950
2300
1100
850
860
715
650
250
190
155
135
Data Sheet
Nov/06