The SN65HVDA100 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 SN65HVDA100 into the LIN bus signal through a current-limited wave-shaping driver as outlined by the LIN Physical Layer Specification. The receiver converts the data stream from the LIN bus and outputs the data stream via RXD. The LIN bus has two states: dominant state (voltage near ground) and recessive state (voltage near battery). In the recessive state, the LIN bus is pulled high by the 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, low quiescent current is needed even though the wake-up circuits remain active and allow for remote wake up via the LIN bus or local wake up via the NWake or EN pins.
The SN65HVDA100 has been designed for operation in the harsh automotive environment. 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 transmitter is immediately switched off and remains off until the fault condition is removed.
Qualified for Automotive Applications
Local Interconnect Network (LIN) Physical Layer Specification Revision 2.1 Compliant and Conforms to SAEJ2602 Recommended Practice for LIN
Extended Operation With Supply From 5 V to 27 V DC (LIN Specification 7 V to 18 V)
LIN Transmit Speed up to 20-kbps LIN Specified Maximum, High-Speed Receive Capable
Sleep Mode: Ultralow Current Consumption Allows Wake-Up Events From: LIN Bus, Wake-Up Input (External Switch) or Host MCU
Wake-Up Request on RXD Pin
Wake-Up Source Recognition on TXD Pin
Interfaces to MCU With 5-V or 3.3-V I/O Pins
High Electromagnetic Compatibility (EMC)
Control of External Voltage Regulator (INH Pin)
Supports ISO9141 (K-Line) -Like Functions
ESD Protection to ±12 kV (Human-Body Model) on LIN Pin
LIN Pin Handles Voltage From –27 V to 45 V (Short to Battery or Ground)
Survives Transient Damage in Automotive Environment (ISO 7637)
Undervoltage Protection on VSUP
TXD Dominant State Time-Out Protection
Prevention of False Wake-Ups With Bus Stuck Dominant Fault
Unpowered Node or Ground Disconnection Failsafe at System Level, Node Does Not Disturb Bus (No load on bus)