MLX80004 Datasheet, PDF (16/38 Pages) Melexis Microelectronic Systems – Enhanced Universal Dual/Quad LIN Transceiver

MLX80002/MLX80004
Enhanced Universal Dual/Quad LIN Transceiver
Datasheet
8.1. Operating Modes
Mode
Standby
Active
Sleep
MODE0
0
1
1
0
0
MODE1
0
1
0
1
0
Table 7: Operating Modes
TxDx
weak pulldown/ active low
[1]
RxDx
floating/ active low ^[2]
weak pulldown/ input
for transmit data stream
output for LIN data stream
weak pull down
floating
INH
Vs
Vs
floating
LIN transceiver
Off
On
[3] [4] [5]
Off
[1] Indicates the wake up flag in case of local wake up
[2] After power on RxDx is floating. If any wake up(local or remote) occurs it will be indicated by active low
[3] Active low interrupt at pin RxD will be removed when entering normal mode
[4] Wake up source flag at pin TxD1 will be removed when entering normal mode
[5] Active modes will be entered by a low -> high transition on pin MODEx. When recessive level (high) on pin TxDx is present the transmit path
will be enabled
8.2. Initialization and Standby mode
When the battery supply voltage Vs exceeds the specified threshold V_{S_UV}, the MLX80004/2 automatically enters an
intermediate standby mode. The INH output becomes HIGH (Vs) and can be used for a battery driven interrupt or to
switch on an external ECU – voltage regulator. The pins RxDx are floating and the integrated master (slave) pull up
resistor with decoupling diode pulls the pin LIN. The transmitter and the receiver are disabled.
If no mode change occurs to any active mode via a MODE0/1 LOW to HIGH transition within the time stated (typically
350ms), the IC enters the most power saving sleep mode and the INH output will become floating (logic 0).
Furthermore the standby mode will be entered after a valid local or remote wake up event, when the MLX80004/2 is
in sleep mode. The entering of the standby mode after wake up will be indicated by an active LOW interrupt on pin
RxDx.
The MLX80004/2 enters the standby mode as well in case of a battery under-voltage condition. That happens while
being in sleep mode or any active mode.
8.3. Active Modes
By entering the active modes the MLX80004/2 can be used as interface between the single wire LIN bus and the
microcontroller. The incoming bus traffic is detected by the receiver and transferred via the RxDx output pin to the
microcontroller. (see Figure 4, LIN timing diagram)
The active modes can be entered being in sleep or standby mode, when the pin(s) MODE0/1 are driven HIGH.
Revision 021 – Sept 2016
Page 16 of 38