The SN65HVDA195 device is the Local Interconnect Network (LIN) physical interface and
MOST ECL interface, which integrates the serial transceiver with wake-up and protection features.
The bus is a single-wire bidirectional bus typically used for low-speed in-vehicle networks using
data rates to 20 kbps. The device can transmit with an effective data rate of 0 kbps because it
does not have dominant state time-out. The protocol output data stream on TXD is converted by the
SN65HVDA195 into the bus signal through a current-limited wave-shaping driver as outlined by the
LIN Physical Layer Specification Revision 2.0. The receiver converts the data stream from the bus
and outputs the data stream through RXD. The bus has two states: dominant state (voltage near
ground) and the recessive state (voltage near battery). In the recessive state, the bus is pulled
high by the SN65HVDA195’s internal pullup resistor and series diode, so no external pullup
components are required for slave applications. Master applications require an external pullup
resistor (1 kΩ) plus a series diode per the LIN specification.
In sleep mode, the SN65HVDA195 requires low quiescent current even though the wake-up
circuits remain active, allowing for remote wake up through the LIN bus or local wake up through
the NWake or EN pins.
The SN65HVDA195 has been designed for operation in the harsh automotive environment. The
device can handle LIN bus voltage swings from 40 V down to ground and survive –40 V. The device
also prevents back-feed current through LIN to the supply input, in case of a ground shift or
supply voltage disconnection. It also features undervoltage, overtemperature, and loss-of-ground
protection. In the event of a fault condition, the output is immediately switched off and remains
off until the fault condition is removed.
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