MLX16305 Datasheet, PDF (19/29 Pages) Melexis Microelectronic Systems – Interlock switch sensor interface IC

MLX16305
Interlock switch sensor interface IC
Remark 1:
When reducing Rref, the absolute maximum Isense current be limited to 90mA.
For instance
• For Vref = 3V => Isenselim [20, 60]mA
So even if Vsup-Vref allows higher currents, the operating range is limited by the current limitation.
An alternative is to reduce Rref, to increase the current limit.
For instance RREF = 500Ω.
=> Isenselim [40, 120]mA
Remark that the absolute maximum Isense current should.
• Vref = 8.25V => Isenselim [72.5, 112.5]mA
Remark that the absolute maximum Isense current is limited to 90mA.
An alternative is to increase RREF, for instance to 1500Ω.
=> Isenselim [45, 75]mA
Remark 2:
Current limitation can be monitored via the voltage on MEAS_OUT:
• In Current Mode:
V_MEASOUT = [ 0.9* V_REF , V_REF + 0.5V ]
• In Voltage Mode:
V_MEASOUT = V_SENSE / 2 < V_REF / 2
13. Overtemperature Detection
The MLX16305 has an internal overtemperature detection to protect against destruction and overheating.
By applying the correct sequence on the digital input pins the OVERTEMP state is readable via the
MEAS_OUT pin coded as:
• VMEAS ≤ VMEAS_OTL = normal operation
• VMEAS ≥ VMEAS_OTH = Overtemperature condition detected.
When an overtemperature condition is detected the supply regulator will shut down until the overtemp
condition has gone. Then diagnostics should show the root cause of the overtemperature condition.
3901016305
Rev. 005
Page 19 of 29
Data Sheet
Oct/06