MLX90320_12 Datasheet, PDF (8/33 Pages) Melexis Microelectronic Systems – Automotive sensor interface

MLX90320
Automotive sensor interface
Typical sensor
output span that
can be
accommodated
to achieve 4V
output span
Typical sensor
offset that can
be compensated
With an optimal
2.5
compensation of
the sensitivity
temperature drift
(i.e. with the fine
gain equal to the
middle range
value)
Depends on
gain
settings and
desired
output offset
voltage. See
Table 3 below
for an
overview.
40
mV/Vsupply
97.2
mV/Vsupply
Output Offset
programmable
Output Offset
resolution
Overall non
linearity
Wake-up time at
power up
Output noise
Response time
10
Best fit value
MLX90320
0
operational, in
spec.
47nF FLT
capacitance with
maximum gain
Set by an
external
capacitor
90
%VDD
0.1
%VDD
±0.1
%VDD
10
ms
5
mVrms
0.1
ms
Remark 1: for a reduced temperature range of -40^oC to 135^oC, the MLX90320 is able to cover the output voltage
range from 5%Vdd till 95%Vdd for all loads higher then 2kOhm.
Remark 2: When using a pull up load, during a fault condition, a leakage current of 20µA maximum will flow in the
load. The voltage drop due to this leakage current will limit the achievable high voltage. To be sure that the high
fault band is always achieved during a fault condition a load smaller than 4%Vdd/ 20µA = 10kOhm has to be
used.
Remark 3: Each clamping level itself has an inaccuracy of +/-2%Vdd maximum. But the 1.3%Vdd step between
each level is very accurate. By selecting the clamping level closest to the desired level an accuracy of +/-
0.65%Vdd can be reached. To be sure that there is never an overlap between the fault bad and the normal band
it is better to keep at least a 1%Vdd gap between the clamping level and the fault band (i.e. the maximum
clamping level should be ≤ 95%Vdd and the minimum should be ≥ 5%Vdd).
3901090320
Rev 007
Page 8 of 33
Data Sheet
Feb/12