ST AEK-POW-SPSB081 Getting Started

Getting started with the AEK-POW-SPSB081 automotive power management IC
Introduction
Embedded application processors and components in complex systems require supply with multiple power rails and multiple
power domains. Power management integrated circuits (PMICs) integrate multiple voltage regulators and control circuits into a
single chip, thus representing an excellent option to implement complete and integrated power supply solutions. Designing with
PMICs simplifies power management in complex embedded systems, optimizes power consumption and extends battery life. In
addition, they reduce circuit board space and component count.
PMICs are an excellent fit for embedded processing in a wide range of applications such as body control modules, seat control
modules, sunroof modules, tailgate modules, door modules, light control modules, gear shifters, steering columns, fuel pumps,
electric vehicles, and autonomous vehicles.
The AEK-POW-SPSB081 is a power management IC evaluation board with enhanced power management functionalities, such
as various standby modes to minimize power consumption and, featuring programmable local and remote wake-up capability.
The board is based on the SPSB081
supply the system microcontroller and another voltage regulator (V2) to supply external peripheral loads such as sensors.
V1 has a fixed rail of 5 V and features overvoltage detection and protection solutions, while V2 works in two different ways: as a
voltage tracker of V1, or as an independent voltage regulator programmable via SPI with 5 V or 3.3 V.
Four additional high-side drivers allow supplying and driving LEDs and sensors. These high-side drivers are driven via SPI and
can be configured in four different modes: OFF, ON, TIMED (with programmable time), and PWM (configurable via device
registers).
Moreover, you can set the high-side driver outputs to be driven by the DIR pin. This functionality allows the user to generate
custom PWM signals for the high-side outputs.
All outputs are short-circuit protected and able to detect open-load.
The communication protocol used to configure
and CLK).
The AEK-POW-SPSB081 also exploits embedded LIN and CAN transceivers, allowing the board to bridge between the
microcontroller and the CAN and LIN communication lines.
An external microcontroller (for example, AEK-MCU-C1MLIT1) has to refresh periodically a watchdog TRIG bit in the
register via SPI to maintain the device in active mode. In case of watchdog failure, the device enters the V1_standby (for energy
saving). To wake it up, send a pulse to the WU1_IN pin or just press the S1 button. By placing a jumper on JP1, the device
enters the debug mode where the watchdog is inactive.
Three demos are available in the AutoDevKit ecosystem, each of them based on a different SPC58 microcontroller evaluation
board connected with an AEK-POW-SPSB081.
The demos show how to use the outputs, configuring them in four different modes: OUT 1 for ON, OUT 2 for TIMED, OUT 3 for
PWM and OUT 4 for DIR.
V2 is configured as a linear regulator and changes settings alternatively every 2.5 s between 3.3 V and 5 V.
CAN connector and CAN_rx/CAN_tx pins are connected to the microcontroller board.
The CAN test signals transmitted from the microcontroller every five seconds can be effectively decoded through CAN_H/
CAN_L pins.
Warning: The AEK-POW-SPSB081
laboratory use only.
UM3269 - Rev 2 - April 2024
For further information contact your local STMicroelectronics sales office.
power management system IC, which embeds one low-drop voltage regulator (V1) to
SPSB081 registers is the SPI, implemented with four wires (MISO, MOSI, CSN,
evaluation board has not to be used in a vehicle as it is designed for R&D
evaluation board with LIN and CAN-FD
UM3269
User manual
SPSB081
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