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STEVAL-PCC019V1：USB to I2C trimming interface board with embedded load for automatic power supply trimming based on the SEA01

The STEVAL-PCC019V1 is an evaluation tool used to interface a Windows^®-based PC with digitally trimmable products like the SEA01 constant voltage and current controller with online digital trimming from STMicroelectronics. It functions basically as a bidirectional bridge between USB and I²C buses. The board also embeds an active CC/CV load to trim SEA01-based power supplies without the need for external instruments (such as supply, voltmeter, active load).

The STEVAL-PCC019V1 is self-supplied via the 5 V from the USB connector.

Three isolated DC-DC modules are used to provide the correct supplies to the remaining parts of the board, maintaining the isolation between the PC and target sides.

The board is also capable of providing the target device (SEA01) with a V_CCvoltage high enough to program NVM (in cases where the supply is < 17 V).

Communication between the STEVAL-PCC019V1 and the PC is managed by a standard serial peripheral, converting the USB connection into a virtual COM port.

The RX and TX signals are then isolated using opto-couplers and connected to the STM32 microcontroller, ensuring that the USB port and the remaining parts of the board are isolated from the mains.

The microcontroller is the heart of the system, and it is in charge of performing conversion between the UART and I²C protocols. The STM32 manages the UART to I²C conversion allowing bidirectional communication between the PC and the target device.

The I²C speed is set to 100 KHz (the maximum speed allowed by the SEA01).

In order to fulfill all possible SEA01 application needs, the board embeds three I²C ports, one of which is also isolated from the 2 others (depending on whether the SEA01 is put on primary or secondary). This allows trimming of the SEA01 in various configurations (primary, secondary side), or even multiple SEA01 chips.

A companion evaluation board (STEVAL-ISA161V1) which includes the SEA01 as secondary side CV/CC controller can be interfaced with the STEVAL-PCC019V1 to test the benefits of digital trimming in a real application.

Key Features

• Bidirectional communication between PC (USB) and SEA01 (I2 C)
• Self-powered from the USB line
• On-board 19 V generation for SEA01 programming
• Electrical isolation between USB and the other circuitry on the board
• Three I2 C buses running at 100 kHz, including one which is electrically isolated from the active load
• Integrated electronic active load with sink capabilities of up to 25 V / 10 A
• Self-calibrated references
• Voltage and current measurement with precision of 0.1% (voltage) and 1% (current)
• Integrated temperature sensor to monitor on-board load temperature
• RoHS compliant

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