STMicroelectronics STEVAL-ISC004V1

Overview

STEVAL-ISC004V1 from STMicroelectronics is a ready-to-use USB Power Delivery (PD) source evaluation board built around the STUSB4710A USB PD controller and ST1S14 step-down DC-DC converter. It converts fixed DC input to programmable VBUS output (5 V, 9 V, 12 V, 15 V, 20 V), supports USB Type-C r1.2 and USB PD r2.0, and includes on-board VBUS power switches, discharge path, and short-to-VBUS protection (22 V on CC, 28 V on VBUS).

For engineers reviewing the STEVAL-ISC004V1 datasheet, STEVAL-ISC004V1 pinout, STEVAL-ISC004V1 application, or STEVAL-ISC004V1 equivalent, this board enables rapid validation of USB PD source implementation, I²C-based PDO configuration, CC line fault resilience, and interoperability with USB-C hosts requiring multi-voltage negotiation.

Technical Context

The board implements a complete USB PD 2.0 source stack: STUSB4710A handles Type-C port detection, PD messaging over CC lines, PDO advertisement, VBUS control signaling, and integrated discharge path activation; ST1S14 provides adjustable buck conversion from DC input to negotiated VBUS voltage with feedback via FB pin and power-good indication via PG.

It integrates dual-role I²C interface (SCL/SDA) for real-time configuration of PDOs and operating modes, supports NUCLEO-F072RB for debug and firmware updates, and uses discrete MOSFETs (Si4925DDY) for VBUS enable/discharge switching with dedicated gate drive and current-sense paths.

Key Specifications

Availability

STEVAL-ISC004V1 is available at Aetrix Electronics and suitable for USB-C PD source validation, embedded power interface development, and USB-C accessory certification testing requiring stable component supply and documented reference design fidelity.

Supply support for STEVAL-ISC004V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and sensor solutions for industrial, automotive, and consumer applications.

The STEVAL-ISC004V1 belongs to ST's USB Power Delivery evaluation platform family, developed to accelerate adoption of USB-C PD source designs by providing fully validated hardware, firmware, and documentation for system-level integration.

FAQ

What input voltage range does the STEVAL-ISC004V1 support?

The board accepts a fixed DC input voltage applied to the VIN terminal (J0-A/J0-B). While the ST1S14 datasheet specifies 4.5 V to 28 V input, the STEVAL-ISC004V1 schematic shows 12 V nominal input via J0-A, and the STUSB4710A's internal regulators require ≥4.75 V for full functionality. Operation outside 5–24 V may compromise VBUS regulation or fault protection timing.

Can the PDO list be modified without external MCU intervention?

Yes - the STUSB4710A supports hardware-selectable PDOs using resistive dividers (R33/R34, R41/R42, etc.) tied to SEL_PDO2–SEL_PDO5 pins. These allow static configuration of up to five PDOs at power-on; dynamic reprogramming requires I²C access via the NUCLEO-F072RB interface or custom host controller.

Does the board support sink mode or dual-role operation?

No - STEVAL-ISC004V1 is strictly a USB PD source. The STUSB4710A on this board is configured as source-only (Rp termination on CC pins, no Rd), and the power path lacks reverse-current blocking or sink-side DC-DC capability. Dual-role operation requires different firmware and hardware, such as STUSB4710B or STUSB4500-based designs.

How is VBUS discharge implemented and verified?

VBUS discharge is performed by an active NMOS path (T41A/T41B Si4925DDY) controlled by VBus_DISCH from STUSB4710A. When VBUS falls below 4.75 V, the controller asserts discharge enable for ≤350 ms. Discharge time is confirmed in the user manual as <300 ms from 20 V to 5 V with 220 µF output capacitance (C5a/C5b), meeting USB PD 2.0 requirements.