MLX16303
Bi-directional Remote Sensor Unit Interface
Features and Benefits
Two identical interface channels for remote sensor units
Two connection modes: connection to OUTx and RETx or connection to OUTx and GND
pin
16 bit Standard SPI for control and diagnosis via a microcontroller
Supply voltage for each remote unit with a supply current up to 45mA
Current limitation with an analog feed back loop for each channel
Receive data from the remote unit by current modulation with a transmission rate of
10kHz
Transmission of data to the remote unit via PWM voltage pulses
Data input/output can be directly connected to a microcontroller input/output (CMOS)
Low current consumption
All pins to the external interface are short-circuit and high-voltage protected
High immunity against cross coupling between the two channels
The current modulation provides high noise immunity for data transfer
Application
Remote automotive sensors (between ECU and sensors).
Ordering Information
Part No.
MLX16303
Temperature Suffix
E (-40° to 85°
C
C)
Package Code
DC (SOIC16, 150 mil)
1. Functional Diagram
Diagnosis circuit
(Temperature, short circuit, open circuit)
2. Description
This interface IC is designed for remote
automotive sensors, especially between a
main ECU and remote (sensor) units. It
contains two identical interfaces and the
main task of each interface is to supply one
remote unit and to receive digital information
from the same remote unit. It is also
possible to send data as PWM voltage
pulses to the remote unit, for example to
program the remote unit for its special
application. This is done by one active wire:
the interface supplies the external unit with
a pre-regulated voltage, the external unit
transmits the digital information back to the
interface by current modulation. A
continuous diagnosis of the IC is running in
the background. The diagnosis results can
be requested by a microcontroller using the
SPI interface.
SSIO0
Transceiver
for
current
conversion or
for sending
PWM pulses
OUT0
Remote unit
driver
RET0
Vdd
Vs
Vp
GND0
Voltage supply
Power on
reset
Current
reference
Transceiver
for
current
conversion or
for sending
PWM pulses
OUT1
Rtrip
SSIO1
Remote unit
driver
RET1
GND1
16 bit SPI interface
CLK
CS
DI
DO
3901016303
Rev. 004
Page 1 of 20
Data Sheet
Jun/04
MELEXIS [ Melexis Microelectronic Systems ]
