MLX16303

Bi-directional Remote Sensor Unit Interface

3901016303

Page 1 of 20

Data Sheet

Rev. 004

Jun/04

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.

Temperature Suffix

Package Code

MLX16303

E (-40°C to 85°C)

DC (SOIC16, 150 mil)

1. Functional Diagram

Transceiver for

current

conversion or

for sending

PWM pulses

Remote unit

driver

Voltage supply

Power on

reset

Current

reference

Diagnosis circuit

(Temperature, short circuit, open circuit)

16 bit SPI interface

Remote unit

driver

Transceiver for

current

conversion or

for sending

PWM pulses

SSIO0

Vdd

Vs

Vp

Rtrip

SSIO1

CLK

CS

DI

DO

OUT0

RET0

GND0

OUT1

RET1

GND1

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.