mlx16305 Melexis Company, mlx16305 Datasheet - Page 15

• Manufacturer Part Number: mlx16305
• Description: Interlock Switch Sensor Interface Ic
• Manufacturer: Melexis Company

10.3. How to do an offset current measurement
In Current Mode (VI_CTRL is set high HIGH),
Set ENABLE = LOW.
Remarks:
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3901016305
Rev. 006
This will set MUX_SUP[0:2] = 000
which will disable the Voltage regulator, such that no Isense current is mirrored into RREF.
Possible Shorts on the SENSE channels have no influence on the offset measurement.
Since ENABLE is low, the latch is transparent. Therefore make sure MUX_SENSE ≠ 000b or 111b in
order to avoid the Z or the Overtemp condition (MuxSenseLatched ≠ 000b or 111b)
Offset may drift over longer periods of time and important temperature variations. Before every
measurement sequence the Offset measurement should be repeated.
In case multiple Rref values are used for the different sense inputs – for instance to set different
sensitivity levels), then the offset voltage (V
individually. Any change to Rref implies a new offset measurement.
In case multiple MLX16305 devices are used in parallel, the offset should be measured and stored for
every device.
An OPEN WIRE condition has Isense = 0mA, and as a result only Ioffset will contribute to the voltage
over Rref. Therefore
Vmeasout_enabled [Open Wire] = V
MEASOUT_IOFFSET
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Interlock switch sensor interface IC
MEASOUT_IOFFSET
) has to be measured for each Rref
MLX16305
Data Sheet
Apr/08