The Microchip's ATA663431/54 system basis chip is a fully integrated LIN transceiver, designed according to the LIN specification 2.0, 2.1, 2.2, 2.2A and SAEJ2602-2, with a low-drop voltage regulator with 3.3V/85mA (ATA663431) or 5V/85mA (ATA663454). Additional the device includes a Watchdog, a high-side switch and 2 high-voltage wake inputs: one positive edge sensitive, one negative edge sensitive. This combination makes it possible to develop simple but powerful slave nodes in LIN bus systems. Improved slope control at the LIN driver ensures secure data communication up to 20Kbaud. Sleep mode and silent mode guarantee minimized current consumption even in the case of a floating or a shorted LIN bus. The voltage regulator is a fully integrated low-drop regulator working down to a supply voltage of 2.3V with best-in-class current consumption in linear mode (2V<V_VS<5V) with less than 170µA. This enables storing data within the MCU during system shutdown even in case of an unexpected power supply interruption.
The device is available in DFN16 package with wettable flanks to enable optical soldering inspection. The footprint is compatible with the ATA663231/54 LIN system basis chip which enables customers to produce modules with/without watchdog by assembling the LIN SBC with watchdog (ATA663431/54) or the ATA663231/54 without watchdog.

• Supply Voltage up to 40V
• Operating Voltage VVS= 5V to 28V
• Very low supply current in sleep mode:typ. 10µA
• Linear Low-Drop Voltage Regulator with 85 mA Current Capability @ VVCC=5.0V, ±2%
• VCC Undervoltage Detection with Open Drain Reset Output (NRES, 4 ms reset time)
• Voltage Regulator is Short Circuit and Overtemperature Protected
• Adjustable Watchdog Time via External Resistor
• Negative Trigger Input for Watchdog
• Limp Home Watchdog Failure Output
• LIN Physical Layer according to LIN 2.0, 2.1, 2.2, 2.2A, ISO 17987-4 and SAEJ2602
• Bus Pin is Overtemperature and Short Circuit Protected versus GND and Battery
• High-Side Switch
• Wake-Up Capability via LIN Bus (100 μs dominant), WKin pin and CL15 pin
• Wake-up Source Recognition
• TXD Time-out Timer
• Advanced EMC and ESD Performance
• Fulfills the OEM “Hardware Requirements for LIN in Automotive Applications Rev.1.3”
• Interference and Damage Protection According to ISO7637
• Qualified According to AEC-Q100
• Package: 16-lead 3 x 5.5 mm VDFN with Wettable Flanks (Moisture Sensitivity Level 1)
• Built-In Safety Features
• Power-on Reset
• Voltage Monitoring (VCC, VS)
• Window Watchdog
• TXD Dominant Timeout