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Melexis Microelectronic Systems

MLX16305 Datasheet Preview

MLX16305 Datasheet

Interlock switch sensor interface IC

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MLX16305
Interlock switch sensor interface IC
Features and Benefits
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6 sense Channels
Large supply current + supply voltage range for maximum contact cleaning
Applicable with all 2-wire Hall effect switches
Diagnoses open wires, shorts to Supplies and shorts between wires
o Current and Voltage measurement mode
o High measurement accuracy: 5%
Current limited supply regulator
Automotive qualified (40V Load Dump)
Over-temperature detection
Small Package: narrow body (150mils) SO16, RoHS compliant
Applications
General Fail safe read out of safety interlock switches to
o Detect human action
o Verify solenoid/motor actuation
Automotive applications
o Next to the Safety ECU: interlock switch sensor supply and sensor I/F
ƒ Seat belt buckle
ƒ Seat occupancy mat
ƒ Air bag presence detection
ƒ Seat position switch
ƒ Airbag disable switch
o Next to Smart Junction Box / Body Control Module: Contact monitoring
ƒ Foot Brake pressed detection
ƒ Park position of the automatic transmission
ƒ Door lock position
ƒ
o Analog Mux
ƒ Resistive coded rotary encoder
ƒ Fuel run dry switch
ƒ Seat Heater switch
ƒ
Industrial applications:
o Industrial Security doors and machine guarding
o General 2 wire analog sensors :
ƒ Industrial pressure, strain gauge, … sensors (ref. MLX90308,
MLX90314)
Ordering Information
Part No.
MLX16305
Temperature Suffix
E (-40°C to 90°C)
Package Code
DC (SOIC16 150mil)
3901016305
Rev. 005
Page 1 of 29
Data Sheet
Oct/06




Melexis Microelectronic Systems

MLX16305 Datasheet Preview

MLX16305 Datasheet

Interlock switch sensor interface IC

No Preview Available !

MLX16305
Interlock switch sensor interface IC
1. Overview application Schematic
VBAT
VSUP
78L05
Resistive Rotary Encoder
Renc Renc Renc Renc
www.DataSheet4U.com
VDD
ADC
Microcontroller
GND
MEAS_OUT
ENABLE
VI_CTRL
MUX_SENSE1
MUX_SENSE2
MUX_SENSE3
VREF VSUPSense1
Sense2
Sense3
MLX16305 Sense4
Sense5
Sense6
GND
RREF
(Rs2)
(Rs3)
Rs6
VBAT
Switch to VBAT
(Rp2)
Switch to GND
Rref
Seat
Interlock Switches
Occupant Resistive and 2-wire Hall
2. Description
The MLX16305 is designed to diagnose the state of remote interlock switches in automotive safety
applications. Its high accuracy allows it to be applied in a broad range of related automotive and
industrial applications using current modulated sensors and switches.
The MLX16305 includes a current-limited regulated supply that is applied to one channel (switch/sensor)
at a time. The supplied current or the resulting supply voltage are measured and presented as an analog
voltage to the microcontroller for interpretation.
Each MLX16305 allows scanning up to 6 switches for changes in switch state, and for any type of
short/open circuit failure mode. The range of switches can easily be extended by adding other
MLX16305 devices in parallel on the same microcontroller ADC input.
The high current and voltage range allow maximum contact cleaning energy for resistive switches. The
high accuracy allows monitoring of contact ageing and early failures detection.
3901016305
Rev. 005
Page 2 of 29
Data Sheet
Oct/06


Part Number MLX16305
Description Interlock switch sensor interface IC
Maker Melexis Microelectronic Systems
Total Page 29 Pages
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