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System base chip

With integrated CAN FD transceiver

The SPSB081 is an IC power management chip providing electronic control units (ECU) with power management functionality. It comprises CAN FD and optionally LIN transceivers.

The SPSB081 family features short-circuit protection and implements open-load diagnosis (Source: STMicroelectronics)

The SPSB081 by STMicroelectronics supports various standby modes to minimize the power consumption with programmable local and remote wake-up capability. The chip has one low-drop voltage regulator to supply the host micro-controller and one voltage tracker to supply external peripheral loads such as sensors. The V1 voltage regulator is available with a fixed rail (5 V or 3,3 V), overvoltage detection and protection solution, while the V2 voltage regulator is a tracker voltage regulator of V1, programmable by SPI (Serial Peripheral Interface) with 5 V or 3,3 V. The SPI port allows control and diagnosis of the chip. Moreover, the component features four high-side drivers to supply LEDs and sensors.

The integrated CAN-FD transceiver complies with ISO 11898-2:2016 and SAE J2284 requirements. It provides local failure and bus failure diagnosis functionality. The chip features also a programmable periodic system wake-up. In TRX normal mode The complete functionality of the CAN-FD transceiver is available (transmitter and receiver) and the automatic voltage biasing is enabled. State transitions from TRX normal mode to VBAT standby mode and V1_Standby mode are possible. No interrupt is generated in this mode.

In the CAN TRX STBY mode, the transmitter is disabled and the RxD_C pin is kept at high (recessive) level. The receiver of the CAN FD transceiver is capable of detecting a wake-up pattern (WUP). In V1_standby mode and VBAT_standby mode, a WUP is indicated to the micro-controller by an interrupt signal. There is no automatic state transition into TRX normal mode in case of a detected WUP. In active mode, the micro-controller can initiate a state transition to TRX normal mode.

Furthermore, in this mode two further sub-modes are possible (“Bias ON” or “Bias OFF”), depending on the CAN_AUTO_BIAS bit (compliant with ISO 11898-2:2016) or timeout conditions. In any case, when entering CAN TRX STBY mode, transition is always to the state “Bias ON”.

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Publish date
2023-01-23
Company

STMicroelectronics

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