MLX90277EGOSR0-0 MELEXIS [Melexis Microelectronic Systems], MLX90277EGOSR0-0 Datasheet - Page 8

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

Two parameters, AGND and OFFSET, are used for adjustment of the V
for coarse adjustment of V
200%V
parameter is used for fine adjustment of the V
large adjustable range allows the MLX90277 to be used in an unipolar magnetic system without limiting the
output voltage span. The formula below shows how the AGND and OFFSET parameters combine to set the
V
This formula approximates the typical V
varies slightly from IC to IC. Melexis calibrates the AGND setting during final test so that the V
approximately 50%V
adjusting the AGND value. The OFFSET parameter is often used to set the application's offset output
transfer characteristic.
The Thermal V
during final test. The value is set to achieve a V
150°C. This parameter is not used by the end customer.
The Sensitivity of the MLX90277's individual sensors is controlled through parameters linked to dedicated
internal amplification stages. The parameter Rough Gain (RG), or pre-amplifier, has 4 bits for adjustment of
two stages. The two MSB affect the Differential Input Differential Output (DIDO) stage. The two LSB effect
the Differential to Single output (DTS) stage. The gain of both the DIDO and DTS are multiplied to get the
total RG. The table below shows typical values of the small signal amplifier gain vs. the parameter RG. The
pre-amplifier is chopper stabilized and the refresh frequency is adapted automatically to the RG setting to
match the chopper gain-bandwidth product.
Table 8: MLX90277 Rough Gain Small Signal Amplifier Gain
3901090277
Rev 004
Rough Gain (MSB LSB)
OQ
10.1 Output Quiescent Voltage (V
10.2 Thermal V
10.3 Sensitivity, Rough Gain and Fine Gain
.
DD
V
. The OFFSET is a 10 bit parameter with a resolution of approximately -0.005V. The OFFSET
00 (00 00)
01 (00 01)
02 (00 10)
03 (00 11)
04 (01 00)
05 (01 01)
06 (01 10)
07 (01 11)
08 (10 00)
09 (10 01)
10 (10 10)
11 (10 11)
12 (11 00)
13 (11 01)
14 (11 10)
15 (11 11)
OQ
=
OQ
−
. 0
Drift is tuned using 4 bits. This parameter, DRIFT, is calibrated for each unit by Melexis
75
DD
OQ
V
with OFFSET set to 512. This gives the V
+
Drift (DRIFT)



OQ
14
. It has a resolution of approximately 0.014V and a range of -100%V
1023
DIDO
.
25
V
205
205
205
205
16
16
16
16
39
39
39
39
82
82
82
82
∗
AGND
OQ
of the MLX90277's individual sensors. The actual V
DTS
OQ



OQ
+
2.33
2.33
2.33
2.33
)
OQ
1.0
1.5
4.0
1.0
1.5
4.0
1.0
1.5
4.0
1.0
1.5
4.0
, while the AGND parameter is used to set the range. The
Page 8 of 21



accuracy below 10mV over a temperature span of 25° C to
−
Dual Programmable Linear Hall Effect Sensor
1023
5
0 .
V
Gain
∗
OFFSET
156
123
191
328
205
308
477
820
16
24
37
64
39
59
91
82
OQ
a range of 0%V



OQ
V
DD
. The AGND is a 10 bit parameter
=
. 5
00
V
MLX90277
DD
to 100%V
OQ
OQ
Data Sheet
DD
Nov/06
DD
formula
is
without
to