MLX90320_12 Datasheet, PDF (18/33 Pages) Melexis Microelectronic Systems – Automotive sensor interface

MLX90320
Automotive sensor interface
• Short-circuit of INP and/or INM with VDD
• Short-circuit of INP and/or INM with GND
• Short-circuit of FLT with VDD or GND
• EEPROM parity error
When a short-circuit of FLT with VDD or GND occurs the output goes to the fault band. For all other internal faults
the output goes to the low fault band.
External faults
Short-circuit
• Output with VDD
• Output with GND
• Output with Vbat
Open circuit
• VDD open
• GND open
In all of these above mentioned fault cases, the IC will generate an output within either of the diagnostic bands.
If the ground broken wire detection is required the load has to be a pull up resistor with a typical value of
2,8kOhm that can be placed at the 90320 side or at the ECU side.
The MLX90320 goes also to fault mode when there is an overflow in the digital calculation of the fine offset or fine
gain compensation.
The MLX90320 must survive the following reversed contacts but the output does not go to the fault bands.
• Reverse polarity
• Reverse battery polarity
• Output reversed with GND
• Output reversed with VDD
3901090320
Rev 007
Page 18 of 33
Data Sheet
Feb/12