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Port-protection IC for STM32 MCUs

STMicroelectronics' TCPP03-M20 USB Type-C port-protection IC has been tailored for Dual-Role Power (DRP) applications.

The IC can be used to simplify the design of products that can act as a power source for connected devices as well as accepting power from other USB-C sources.

When used as a companion chip with STM32G0, STM32G4, STM32L5, and STM32U5 microcontrollers that contain ST’s UCPD (USB Type-C and Power Delivery) interface IP, the TCPP03-M20 enables a cost-effective partitioning of the USB Type-C implementation.

Product designers can achieve a two-chip solution with the STM32 as the host microcontroller, saving bill-of-materials costs, PCB space, and circuit complexity.

As defined in the USB Type-C specification, USB-C dual Role devices have the ability to dynamically change their power role from sink to source as well as their USB data role from device to host (and vice-versa). This enables new use-cases to preserve and share energy between battery-powered devices, as well as to extend device interoperability. The USB DRP capability defined in the Type-C specification allows any USB devices with the ST chip inside to charge the battery of a connected device.

The TCPP03-M20 is built with ST’s BCD process, recently accredited as an IEEE Milestone, to combine logic and high-voltage circuitry on the same chip, enhancing integration and reliability.

The technology enables ±8kV ESD protection (IEC61000-4-2 Level 4), over-voltage, and over-current protection to be implemented on the same chip. These are needed to guard against unintended short-circuits or connection of defective equipment and comply with the USB-C Power Delivery specification.

The chip integrates switches for the USB-C port VCONN and CC lines, a charge pump with two N-channel MOSFET gate drivers for Source and Sink power path, VBUS and VCONN power-path discharge circuitry, and dead-battery management.

Optimised for ultra-low power consumption, the TCPP03-M20 is dedicated to the USB DRP use case to ensure optimum efficiency. Standalone Power Sink and Power Source applications are handled using ST’s TCPP01-M12 and TCPP02-M18 BCD ICs respectively. The TCPP03-M20 is compliant with the latest features of the USB-C PD specification 3.1 Standard Power Range (SPR), including PPS (Programmable Power Supply).

The STM32 Nucleo expansion board, X-NUCLEO-DRP1M1, and X-CUBE-TCPP STM32Cube expansion software with application code examples, are available to kickstart projects using the TCPP03-M20 for DRP applications up to 100W.

Developers can also take advantage of support for UCPD configuration in STM32CubeMX, the STM32G071B-DISCO USB-C sniffer, and the STM32CubeMonitor-UCPD debug tool.

The X-NUCLEO-SNK1M1 board is available for sink applications, and the X-NUCLEO-SRC1M1 for Power Delivery Source development is planned for release in Q4 2021.

Neil Tyler

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