The TPIC1021A is the Local Interconnect Network (LIN) physical interface, which
integrates the serial transceiver with wake-up and protection features. The LIN bus is a
single-wire bidirectional bus typically used for low-speed, in-vehicle networks using data rates
between 2.4 kbps and 20 kbps. The LIN protocol output data stream on TXD is converted by the
TPIC1021A into the LIN 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 LIN
bus and outputs the data stream through RXD. The LIN bus has two states: dominant state (voltage
near ground) and the recessive state (voltage near battery). In the recessive state, the LIN bus is
pulled high by the TPIC1021A’s internal pullup resistor (30 kΩ) 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 TPIC1021A requires low quiescent current even though the wake-up
circuits remain active, allowing for remote wakeup through the LIN bus or local wakeup through the
NWake or EN pins.
The TPIC1021A 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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