MLX90316EDC ETC2 [List of Unclassifed Manufacturers], MLX90316EDC Datasheet - Page 8

• Manufacturer Part Number: MLX90316EDC
• Description: Rotary Position Sensor IC
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

The DSP functionality is governed by the micro-code (firmware
stored into the ROM (mask programmable). In addition to the ATAN function, the F/W controls the whole
analog chain, the output transfer characteristic, the output protocol, the programming/calibration and also
the self-diagnostic modes.
In the MLX90316, the ATAN function is computed via a look-up table (i.e. it is not obtained through a
CoRDiC algorithm).
Due to the fact that the ATAN operation is performed on the ratio V
intrinsically self-compensated vs. flux density variations (due to airgap change, thermal or ageing effects)
affecting both signals. This feature allows therefore an improved thermal accuracy vs. rotary position
sensor based on conventional linear Hall sensors.
In addition to the improved thermal accuracy, the realized rotary position sensor is capable of measuring a
complete revolution (360 Degrees) and the linearity performances are excellent taking into account typical
manufacturing tolerances (e.g. relative placement between the Hall IC and the magnet).
Once the angular information is computed (over 360 degrees), it is further conditioned (mapped) vs. the
target transfer characteristic and it is provided at the output(s) as:
For instance, the analog output can be programmed for offset, gain and clamping to meet any rotary
position sensor output transfer characteristic:
where Voffset, Gain, ClampLo and ClampHi are the main adjustable parameters for the end-user.
The linear part of the transfer curve can be adjusted through either a 2 point or a 3 point calibration
depending on the linearity requirement.
The calibration parameters are stored in EEPROM featuring a Hamming Error Correction Coding (ECC).
The programming steps do not require any dedicated pins. The operation is done using the supply and
output nodes of the IC. The programming of the MLX90316 is handled at both engineering lab and
production line levels by the Melexis Programming Unit PTC-04 with the dedicated MLX90316
daugtherboard and software tools (DLL
3901090316
Rev. 001
an analog output level through a 12 bit DAC followed by a buffer
a digital PWM signal with 12 bit depth (programmable frequency 100 Hz
a digital Serial Protocol (SP
Vout( ) = ClampLo
Vout( ) = Voffset + Gain
Vout( ) = ClampHi
14 bits computed angular information available)
User Interface).
Page 8 of 34
for min
for
for
Rotary Position Sensor IC
F/W) of the micro-controller which is
Y
min
max
/V
X
, the angular information is
max
1 kHz)
4 October 05
Data Sheet