Monolithic Power Systems Inc. EVKT-USBSPI-00

Overview

EVKT-USBSPI-00 from Monolithic Power Systems is a USB-to-SPI communication interface evaluation kit designed to enable rapid configuration, register access, and functional validation of MPS SPI-controlled power ICs-including DC/DC converters, LED drivers, and PMICs-via host PC. It supports 5-pin and 10-pin ribbon cable interconnects, operates at 3.3 V logic level, and requires no external power supply beyond USB bus power.

For engineers reviewing the EVKT-USBSPI-00 datasheet, EVKT-USBSPI-00 pinout, EVKT-USBSPI-00 application, or EVKT-USBSPI-00 equivalent, this kit serves as a hardware bridge for SPI GUI tool integration, enabling real-time register read/write, timing waveform verification, and fault injection testing during early-stage digital power IC evaluation.

Technical Context

The EVKT-USBSPI-00 implements a USB 2.0 Full-Speed (12 Mbps) interface with an embedded microcontroller that translates USB CDC ACM commands into SPI frame sequences. It supports standard SPI modes (0 and 3), configurable clock polarity and phase, and fixed 3.3 V I/O voltage referenced to the target evaluation board's VDDIO.

It provides two physical ribbon cable interfaces: a 5-pin variant (SCK, SDI, SDO, CS, GND) and a 10-pin variant (SCL, GND, GND, SDI, SDA, SDO, GND, SCK, NC, NCS), where SCL/SDA pins are reserved but unused in SPI mode-confirming dedicated SPI-only operation despite dual-labeling in documentation.

Key Specifications

Availability

EVKT-USBSPI-00 is available at Aetrix Electronics and suitable for digital power IC evaluation, firmware bring-up of SPI-configurable PMICs, and lab-based validation of MPS DC/DC converter register maps requiring stable component supply and documented interface behavior.

Supply support for EVKT-USBSPI-00 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs for industrial, automotive, cloud computing, and consumer applications.

The EVKT-USBSPI-00 belongs to MPS's evaluation kit product line, engineered specifically to accelerate time-to-test for their SPI-programmable power IC portfolio-not as a general-purpose USB-SPI adapter but as a tightly coupled, firmware-validated interface for MPS GUI ecosystem interoperability.

FAQ

Is EVKT-USBSPI-00 compatible with non-MPS SPI devices?

No. The kit's firmware and SPI GUI tool are hardcoded to recognize only MPS device IDs and register layouts. It lacks generic SPI command framing or user-definable opcode mapping, and does not enumerate as a standard CDC or HID device-preventing use with third-party ICs or custom SPI peripherals.

Does EVKT-USBSPI-00 support SPI clock frequencies above 10 MHz?

No. Maximum verified SPI clock rate is 10 MHz, as confirmed by timing analysis in the Rev. 1.0 quick start guide and GUI tool limitations. Higher rates cause frame corruption due to USB-to-SPI translation latency and internal buffer constraints-not a function of physical layer capability.

Can the 10-pin ribbon cable be used interchangeably with the 5-pin cable?

Yes-but only when the target evaluation board exposes all 10 pins per Table 1. The 5-pin cable omits SCL, SDA, NC, and NCS; using it on a 10-pin header risks misalignment and signal shorts. MPS explicitly states the 5-pin cable is intended for legacy MPS boards with minimal SPI pinout.

Is Linux or macOS support available for the SPI GUI tool?

No. The official SPI GUI tool is Windows-only (tested on Windows 10/11 x64) and relies on WinUSB drivers. No command-line utility, libusb wrapper, or open-source alternative is published or supported by MPS for cross-platform use.

What happens if the USB cable is connected after powering the evaluation board?

Hot-plugging the USB cable after board power-on may damage communication pins. The quick start guide mandates connecting the ribbon cable first, then USB-due to lack of hot-swap protection circuitry and undefined I/O state during USB enumeration, risking latch-up on shared GND or floating CS lines.

Does EVKT-USBSPI-00 include EEPROM or flash for storing device configurations?

No. It contains no non-volatile memory. All configuration-including SPI mode, clock divider, and target device address-is held in volatile RAM and reset on USB disconnect or host reboot. Configuration persistence must be managed externally via the GUI tool's project save/load feature.