MLX80001 Datasheet, PDF (15/28 Pages) Melexis Microelectronic Systems – 4-channel Master LIN Transceiver

MLX80001
4-channel Master LIN Transceiver
Thermal
shutdown
High resistive LINx
termination
RxDx = low
No TxDx -> LINx
transmission possible
M0&1=>Low
RxD L->H > 150us
LINx termination
1kOhm
Low Slew Mode
M0 M1 RxDx INH
low
high
LINx-
data
V_S
High Speed Mode
M0 M1 ^RxDx INH
high low
LINx-
data
V_S
Normal Slew Mode
M0 M1 RxDx INH
high high
LINx-
data
V_S
V_S on
M0&1 =>High
RxDx
time out
Only faulty blocked
channels switched to high
resistive LIN termination
RxD=L > 10ms
M0&1=>Low
after 200ms
-> no mode change
-> no valid wake up
[1] _{active low interrupt, indicates source of wake up}
after power on all channel RxDx are active low
M0/1 =>High
(if VCC_ECU on)
Standby
M0/1 INH RxDx
low V_{S low}^[1]
High resistive LINx
termination
Sleep Mode
M0&1 RxDx
INH
low
high/
VCCECU
floating
High resistive LINx
termination
wake up
request
from LINx
Figure 6 - State diagram MLX80001
3.4 Power on procedure , INH Pin – INHIBIT
After power on the MLX80001 automatically enters an intermediate standby mode, the INH output becomes
HIGH (VBAT) and therefore the external voltage regulator will provide the Vcc supply voltage for the ECU . If
there is no mode change within the time stated (typically 350ms), the IC re-enters the sleep mode and the
INH output is going to become floating (logic 0).
When the device detects a valid wake up condition (bus traffic on any of the four LIN networks exceeds the
wake up filter time delay) the INH output becomes HIGH (VBAT) again and the same procedure starts as
described after power on. In case of a mode change to any active mode the sleep timer is stopped and INH
keeps HIGH(VBAT). If the transceiver enters the sleep mode (M0/1=0) , INH goes to logic 0 (floating) after
typically 350 ms when no valid wake up is detected.
MLX80001 – Datasheet
3901080001
Page 15 of 28
March 2007
Rev 001