MLX80004 Datasheet, PDF (17/38 Pages) Melexis Microelectronic Systems – Enhanced Universal Dual/Quad LIN Transceiver

MLX80002/MLX80004
Enhanced Universal Dual/Quad LIN Transceiver
Datasheet
MODE0
L
H
L
H
MODE1 Mode
L
Sleep Mode
L
High Speed Mode (slew rate control
disabled)
H
Low speed mode
H
Normal Mode
Table 8: Mode Selection Table
8.3.1. High Speed mode
This mode allows high speed data download up to 100Kbit/s. The slew rate control is disabled. The falling edge is the
active driven edge, the speed of the rising edge is determined by the network time constant.
8.3.2. Low speed mode
This mode is the recommended operating mode for J2602 applications with a maximum baud rate of 10.4kBd. The
slew rate control of any channel is optimized for minimum radiated noise, especially in the AM band.
8.3.3. Normal speed mode
Transmission bit rate in normal mode is up to 20kbps. The slew rate control of any channel is optimized for maximum
allowed bit rate in the LIN specification package 2.x.
8.4. Sleep Mode
The most power saving mode of the MLX80004/2 is the sleep mode. The mode change into sleep mode is possible
regardless of the voltage levels on the LINx bus, pins WAKE or TxDx. The MLX80004/2 offers two procedures to enter
the sleep mode:
 The sleep mode will be entered if both the pins MODE0 and MODE1 are being driven LOW for longer than the
specified filter time (t_{MODE_deb}) when in active modes.
 If the MLX80004/2 is in standby mode after power-on or wake-up, a sleep counter is started and switches the
transceiver into sleep mode after the specified time (typ. 350ms) if the microcontroller of the ECU will not
confirm the active operation by setting MODE0/1 pins to logic HIGH. This feature allows faulty blocked LIN
nodes to reach the most power saving sleep mode anyway.
Being in sleep mode the INH pin becomes floating and can be used to switch off the ECU voltage regulator in order to
minimize the current consumption of the complete LIN node (preferred feature in slave applications). The transmitters
are disabled and the pins RxDx are disconnected from the receive path and become floating. The master(slave)
termination resistor (LIN pull up resistor with decoupling diode between pins LIN and Vs) is disconnected, only a weak
LIN pull up current of typically 50uA is applied to the LINx bus (see chapter 9 Fail-safe Features)
Revision 021 – Sept 2016
Page 17 of 38