STMicroelectronics STEVAL-POEL45W1

Overview

STEVAL-POEL45W1 from STMicroelectronics is a Power over Ethernet (PoE) powered 45 W LED driver reference design compliant with IEEE 802.3af/at/bt, featuring Bluetooth Low Energy (BLE) remote control, constant-current buck topology operation, and support for 6–11 white LEDs (3.3 V each) at 1.4 A output with < 0.05% current regulation. It enables IP-based indoor lighting systems without AC infrastructure.

For engineers reviewing the STEVAL-POEL45W1 datasheet, STEVAL-POEL45W1 pinout, STEVAL-POEL45W1 application, or STEVAL-POEL45W1 equivalent, this reference design delivers verified PoE-PD interface integration (PM8805), high-efficiency LED6000 driver, certified SPBTLE-1S BLE module, and firmware-controlled dimming down to 1% brightness without flicker.

Technical Context

The design implements an IEEE 802.3bt-compliant Powered Device interface using the PM8805 QFN56 IC with integrated dual-active bridge, supporting Class 6 power classification (up to 60 W input). Input voltage range is 37–57 VDC, derived directly from PoE sourcing.

LED current regulation is handled by the LED6000 monolithic 3 A, 61 V current source operating in buck mode, with digital dimming via PWM input (DIM pin) and 1% resolution enabled through BLE command parsing. Standby power is < 100 mW, and peak efficiency exceeds 95% at full load.

Key Specifications

Availability

STEVAL-POEL45W1 is available at Aetrix Electronics and suitable for PoE-powered smart lighting, industrial IoT luminaires, and networked building management systems requiring stable component supply and rapid prototyping validation.

Supply support for STEVAL-POEL45W1 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, designing and manufacturing microcontrollers, analog ICs, power management, sensors, and wireless solutions for industrial, automotive, and consumer applications.

This reference design belongs to ST's Power over Ethernet and Smart Lighting solution portfolio, engineered to accelerate development of standards-compliant, firmware-upgradable, LAN-integrated LED lighting systems with zero AC wiring dependency.

FAQ

What firmware is preloaded on the STEVAL-POEL45W1 board?

The board ships with STSW-POEL45FW firmware, enabling Bluetooth LE control via the PoE_Lighting Android app. Firmware updates are performed using the STSW-BNRG1STLINK utility through SWD interface (SWCLK/SWDIO/NRST pins on J6 header). The firmware handles PoE negotiation, LED current regulation, dimming state persistence, and BLE command parsing.

Can the STEVAL-POEL45W1 drive more than 11 LEDs?

No - the design is optimized for 6–11 white LEDs (3.3 V each), resulting in a nominal forward voltage range of 19.8–36.3 V. With 33 V output and LED6000's 61 V maximum VIN capability, exceeding 11 LEDs risks violating the buck converter's minimum input-output differential margin and may trigger under-voltage lockout or regulation loss.

Is the SPBTLE-1S module replaceable with BLUENRG-M2SA without hardware changes?

Yes - SPBTLE-1S and BLUENRG-M2SA are pin-to-pin compatible per ST documentation. Both modules share identical footprint, power sequencing, and GPIO mapping. No PCB modification is needed; only firmware update is required to leverage BLE v5.2 features such as extended advertising and higher throughput.

Does the reference design support Power Sourcing Equipment (PSE) detection and classification?

Yes - the PM8805 IC implements full IEEE 802.3bt detection, classification (Class 6), and signature verification. It supports two-event classification, supports auxiliary power via VCP, and provides PGD (Power Good) signal assertion after successful handshaking and stable DC output establishment.