1 System Description

The TPS65386x-Q1 device integrates multiple supply rails to power the microcontroller (MCU), Controller Area Network (CAN), Ethernet, and FlexRay® transceivers, external sensors, and other peripheral devices. A buck-boost converter with internal field-effect transistors (FET) converts the input battery voltage to a pre-regulated output that supplies the other regulators and system loads.

TPS65386x-Q1 supports wake-up from two external sources through the WAKEx pins. These pins are compatible with supply referenced and digital signal levels and integrated low-power timer-based wakeup.

The device has four integrated linear regulators (LDO) with configurable output voltage and bypass mode. This device also has two linear regulators protected against shorts to chassis-ground (–2V) and supply (+36V) protected low dropout regulators (PLDO). These regulators are configurable for fixed mode output (configurable voltages) and tracking mode output voltage. Unused LDOs and PLDOs can be used as a voltage monitor. The LDOs and PLDOs are pre-configured by the respective device part number (NVM).

A voltage monitoring unit inside the device monitors undervoltage and overvoltage on all internal supply rails, regulator outputs, and supply input (battery). Regulator current limits and temperature protections are also implemented.

The TPS65386x-Q1 device features a question-answer watchdog, MCU error-signal monitor, and clock monitoring on an internal oscillator. The device includes self-check on clock monitor, cyclic redundancy check (CRC) on non-volatile memory, and serial peripheral interface (SPI) communication. A diagnostic output pin allows the MCU to observe device internal analog and digital signals. A reset circuit for the MCU and an enable output disable external power-stages on any detected system-failure. A built-in self-test (BIST) allows for monitoring the device functionality at start-up.