Susie Maestre

user Electronics Engineer

city Innovuze Solutions Inc.

  • LIN Transceiver with Voltage Regulator

  • Created: Mar 21, 2016

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This reference design is a Local Interconnect Network (LIN) transceiver, which features a voltage regulator circuit and a RESET pin. The LIN transceiver used in this design is the NCV7425 that is designed to interface a LIN protocol and a physical bus. This particular IC integrates a LIN 2.1 physical transceiver and a low-drop voltage regulator. In addition, SP36-01WTG-C-HV TVS diode is added to the circuit as ESD protection. This SP36-01WTG-C-HV can safely absorb repetitive ESD strikes above the maximum level of the IEC61000- 4-2 international standard (Level 4, ±8kV contact discharge) without performance degradation and safely dissipate up to 8A (SP12-01WTG-C-HV) of induced surge current (IEC61000-4-5, tP=8/20μs) with very low clamping voltages.

This LIN transceiver used in this design contains the LIN transmitter, LIN receiver, voltage regulator, power-on-reset (POR) circuits and thermal shutdown (TSD). The LIN transmitter is optimized for the maximum specified transmission speed of 20 kBaud with electromagnetic compatibility (EMC) performance due to reduced slew rate of the LIN output. The junction temperature is monitored via a thermal shutdown circuit that switches the LIN transmitter and voltage regulator off when temperature exceeds the TSD trigger level. NCV7425 has four operating states (normal mode, low slope mode, stand-by mode, and sleep mode) that are determined by the input signals EN, WAKE, STB, and TxD.

This design is applicable in broad range applications including automotive and industrial network. This is also useful for in-vehicle monitoring and other industrial equipment. The LIN bus is designed to communicate low-rate data from control devices such as door locks, mirrors, car seats, and sunroofs at the lowest possible cost.



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