STMicroelectronics STEVAL-BTDP1

Overview

STEVAL-BTDP1 from STMicroelectronics is a USB dongle evaluation tool for the SPBT3.0DP1 Bluetooth® Class 1 module, integrating USB interface, onboard antenna, reset button, and preloaded AT-command firmware. It operates at 5 V supply, supports -40 °C to +85 °C case temperature, and enables PC-based Bluetooth link establishment and firmware reprogramming via USB.

For engineers reviewing the STEVAL-BTDP1 datasheet, STEVAL-BTDP1 pinout, STEVAL-BTDP1 application, or STEVAL-BTDP1 equivalent, this page delivers verified I/O mapping, bootloader mode configuration, factory firmware behavior, USB-to-Bluetooth bridging architecture, and direct GPIO access points for rapid prototyping and interoperability validation.

Technical Context

The dongle implements a hardware bridge between USB 2.0 (via CP2104 UART bridge IC) and the SPBT3.0DP1 Bluetooth module, with dedicated 3.3 V LDO (LDS3985M33) and 1.8 V regulator (MCP1700T-1802E) powering respective subsystems. Bootloader entry is controlled by JP1 jumper and BOOT0 pin assertion.

All 21 pads provide direct access to SPBT3.0DP1 signals including UART2 (TXD/RXD/CTS/RTS), I²C (SCL/SDA), I²S (CLK/WS/SD), JTAG debug pins (JTMS/JTCK/JTDI/JTDO), and 12 GPIOs - with LED2 and LED3 tied to GPIO05 and GPIO01 for active-state and link-up status indication.

Key Specifications

Availability

STEVAL-BTDP1 is available at Aetrix Electronics and suitable for Bluetooth module evaluation, embedded wireless prototyping, AT-command-based SPP development, and industrial IoT gateway validation requiring stable component supply and documented USB-BT interface behavior.

Supply support for STEVAL-BTDP1 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 devices, sensors, and wireless solutions for industrial, automotive, and consumer applications.

The STEVAL-BTDP1 belongs to ST's ST evaluation tools product line, engineered specifically to accelerate time-to-proof-of-concept for Bluetooth-enabled designs using ST's certified SPBT3.0DP1 module.

FAQ

What firmware is preloaded on the STEVAL-BTDP1?

The dongle ships with factory-loaded AT-command firmware compliant with Bluetooth Serial Port Profile (SPP). This firmware allows immediate PC communication via standard terminal software using commands like AT+BTSTATE?, AT+BTSCAN, and AT+BTCONN to discover and pair with remote devices - no custom host driver or SDK required.

How do I enter bootloader mode to update the SPBT3.0DP1 firmware?

Closed JP1 jumper forces bootloader mode on next reset. After pressing SW1, the SPBT3.0DP1 halts application execution and waits for firmware upload via UART using STM32 Flash Loader Demonstrator GUI. The CP2104 USB-UART bridge provides the physical interface; no additional hardware programmer is needed.

Which GPIOs are connected to LEDs and what do they indicate?

LED2 connects to GPIO05 and illuminates when the SPBT3.0DP1 enters Active State (e.g., after wake-up or command response). LED3 connects to GPIO01 and lights only when a Bluetooth link is successfully established and authenticated - providing unambiguous visual feedback of connection status independent of host software.

Can the STEVAL-BTDP1 be used without modifying hardware or soldering?

Yes - the dongle is fully functional out-of-box: plug into any USB port, install CP2104 VCP drivers (available from Silicon Labs), open a terminal at 115200 bps, and issue AT commands. All 21 test pads are accessible via 0.1" headers, enabling non-invasive signal probing or optional peripheral attachment without soldering or board modification.