MLX80002/MLX80004

Enhanced Universal Dual/Quad LIN Transceiver

Datasheet

Revision 021 – Sept 2016

Page 21 of 38

8.7. Master / Slave configuration

The target applications of the MLX80004/2 are BCM master modules with multiple LIN channels. In order to be able to

use the same module for a wide variety of applications with different stages of extension, a space efficient and cost

effective adaptation on the number of LIN channels is desired.

The MLX80004/2 device family offers the combination of quad and dual channel LIN transceiver within the same

advanced package and a compatible foot print.

By the integration of the LIN master-termination (decoupling diode and 1K resistor) the external circuitry can be

minimized in terms of space as well as BOM (bill of material). The RxD time-out feature allows the handling of a LIN

short to ground failure without software support by the microcontroller. This application mode is called enhanced

master mode, compatible to the functionality of the quad – LIN transceiver MLX80001.

In case of different BCM requirements it may happen that the external master termination is desired only. To cover

these applications the pin DIS_MAS has been introduced:

DIS_MAS

Mode

LIN termination

Supported fail safe features

GND

Enhanced Master

Mode

Active mode : Diode & 1k

sleep mode :Diode & 60µA

termination in case of LINx short to ground

dominant blocked transmit path

Vs

Standard

Transceiver Mode

Active mode : Diode & 30k

sleep mode :Diode & 60µA

dominant blocked transmit path

Table 9: Time Out Modes

In case of externally mounted master termination (standard transceiver mode), the handling of a LIN short to ground is

not possible. By using the standard transceiver mode, the MLX80004/2 can be used in slave applications as well. To

pull the pin DIS_MAS to high even in case the external ECU regulator is switched off in sleep mode. The pin shall be

connected to Vs via an external resistor. (see Figure 8 at page 24, application example)

In the standard transceiver mode, only the TxDx time-out feature is enabled.