STMicroelectronics SPBT2632C2A.AT2

Overview

SPBT2632C2A.AT2 from STMicroelectronics is a Bluetooth v3.0 Class 2 surface-mount module with embedded Bluetooth stack, profiles, AT command firmware, onboard antenna, STM32 Cortex-M3 microcontroller, and STLC2690 Bluetooth radio. The module provides a ready-to-use Bluetooth serial communication platform for products that need wireless connectivity without a separate RF design.

For engineers reviewing the SPBT2632C2A.AT2 datasheet, SPBT2632C2A.AT2 pinout, SPBT2632C2A.AT2 application, or SPBT2632C2A.AT2 equivalent, this Bluetooth module is most relevant for serial cable replacement, M2M industrial control, service diagnostics, data acquisition, machine control, sensor monitoring, security systems, mobile health devices, and smartphone-connected accessories requiring UART control, embedded SPP support, iAP communication support, integrated antenna, and compact 11.6 mm × 13.5 mm module integration.

Technical Context

SPBT2632C2A.AT2 combines the Bluetooth radio, antenna, STM32-based host processing, embedded firmware, memory, and command interface in a surface-mount PCB module. The module supports Bluetooth v3.0 operation in the 2400 MHz to 2483.5 MHz band, Class 2 radio operation, UART host communication, seven GPIO lines, and firmware upgrade over UART, allowing the host microcontroller to communicate through a simple serial command structure rather than managing the Bluetooth stack directly.

The module operates from a 2.1 V to 3.6 V supply with 2.5 V typical operation. High-speed mode supports up to 1.5 Mbps data throughput, while low-power operation can reach 70 µA standby with deep sleep and an external 32.768 kHz low-power oscillator. RF performance includes -86 dBm typical receiver sensitivity under DH5 test conditions and +6 dBm typical transmitter output power into a 50 Ω load.

Key Specifications

Pinout & Package

SPBT2632C2A.AT2 is supplied as a 16-pin surface-mount PCB module measuring 11.6 mm × 13.5 mm × 2.9 mm with an integrated antenna and multilayer module construction. The module package supports compact Bluetooth integration, but the antenna area requires RF-aware placement: nearby metal, ground planes, power planes, trace routing, and mechanical obstructions should be kept away from the antenna region to preserve link performance.

Key Features

• Bluetooth v3.0 Class 2 module with embedded stack, profiles, and AT command firmware.
• Integrated antenna and complete RF-ready module construction for simplified Bluetooth product integration.
• STM32 Cortex-M3 processor architecture with 256 Kbytes Flash memory and 48 Kbytes RAM memory.
• Main UART host interface with TXD, RXD, RTS, and CTS hardware flow-control signals.
• Up to 1.5 Mbps data throughput and UART-based command/control operation.
• Seven GPIO pins plus one LPO input, with several alternate peripheral functions depending on firmware configuration.
• Supports authentication, encryption, multipoint operation, scatternet support, sniff mode, hold mode, and Bluetooth-WLAN coexistence behavior.
• 2.1 V to 3.6 V supply range, -40°C to +85°C operating temperature range, and compact 11.6 mm × 13.5 mm × 2.9 mm module format.

Applications

Equivalent & Alternatives

When evaluating SPBT2632C2A.AT2 equivalent modules, engineers should compare Bluetooth version, radio class, antenna integration, UART command interface, SPP and iAP firmware behavior, supply voltage, GPIO count, module dimensions, RF certification coverage, host-interface pinout, and whether a design requires a Class 2 or longer-range Class 1 radio configuration.

Compared with SPBT2632C1A.AT2, SPBT2632C2A.AT2 is optimized for smaller Class 2 Bluetooth integration with an 11.6 mm × 13.5 mm form factor. SPBT2632C2A.AT2 vs SPBT2632C1A.AT2 selection depends mainly on required Bluetooth range, available board area, antenna placement constraints, certification reuse needs, and the host firmware's AT2 command workflow.

Quality

SPBT2632C2A.AT2 should be sourced as original STMicroelectronics components through traceable and controlled supply channels. Quality verification procedures may include module marking inspection, tray and label verification, solder-pad and antenna-area inspection, RoHS / ECOPACK compliance review, solderability testing, UART communication test, AT command response verification, Bluetooth link test, RF output and receive-function screening, low-power-mode current inspection, and incoming inspection according to embedded wireless product production requirements.

Availability

SPBT2632C2A.AT2 is available at Aetrix Electronics and suitable for serial cable replacement, M2M industrial control, service diagnostics, sensor monitoring, security systems, mobile health devices, and Bluetooth smartphone accessories requiring stable component supply and repeatable production support.

Supply support may include scheduled delivery planning, volume procurement support, BOM continuity assistance, traceable sourcing management, and long-term availability support for embedded device manufacturers, industrial control builders, wireless accessory developers, repair groups, contract manufacturers, and legacy Bluetooth product owners.

For production deployment, confirming the 16-pin module footprint, onboard antenna keepout, 2.1 V to 3.6 V supply range, UART signal levels, LPO requirement, firmware command set, RF certification needs, tray handling, environmental specifications, and sourcing continuity helps reduce procurement risk and improve manufacturing stability.

Manufacturer

STMicroelectronics supplies wireless connectivity modules, RF components, microcontrollers, sensors, power-management ICs, protection devices, and embedded semiconductor solutions for industrial, consumer, automotive, communication, and portable applications. SPBT2632C2A.AT2 belongs to ST's Bluetooth module portfolio for embedded wireless serial communication and smartphone accessory connectivity.

FAQ

What is SPBT2632C2A.AT2 used for?

SPBT2632C2A.AT2 is used to add Bluetooth v3.0 Class 2 wireless communication to embedded products. It is commonly used for serial cable replacement, industrial M2M communication, service diagnostics, data acquisition equipment, sensor monitoring, security systems, mobile health devices, and smartphone-connected accessories.

Is SPBT2632C2A.AT2 a Bluetooth IC or a module?

SPBT2632C2A.AT2 is a surface-mount Bluetooth module, not a bare Bluetooth IC. It integrates the Bluetooth radio, STM32-based processing, embedded stack, AT command firmware, memory, and onboard antenna in a compact PCB module, allowing the host system to communicate through UART instead of designing the RF section from individual components.

Which host interface does SPBT2632C2A.AT2 use?

SPBT2632C2A.AT2 uses a UART host interface with RXD, TXD, RTS, and CTS signals. The AT command interface uses the main UART by default, which allows the host microcontroller to configure Bluetooth functions, exchange serial data, and manage connection behavior using command-based firmware rather than a host-side Bluetooth protocol stack.

What supply voltage does SPBT2632C2A.AT2 require?

SPBT2632C2A.AT2 operates from a VIN supply range of 2.1 V to 3.6 V, with 2.5 V typical operation. Host interface design should match the module's I/O voltage requirements, and the reset input should be treated carefully because its maximum input level is lower than 5 V tolerant GPIO and UART pins.

What should be considered in SPBT2632C2A.AT2 antenna layout?

SPBT2632C2A.AT2 includes an onboard antenna, so PCB placement directly affects RF performance. The region around the antenna should be kept clear of ground planes, power planes, traces, and metal structures. Traces should not be routed underneath the module, and all ground connections should be made with low impedance to maintain RF stability.

Does SPBT2632C2A.AT2 support low-power operation?

SPBT2632C2A.AT2 supports active, sleep, deep sleep, sniff, hold, and power-down related operating modes. With an external 32.768 kHz low-power oscillator, standby current can reach 70 µA in deep sleep, while Bluetooth power-down / CPU standby current is listed at 25 µA, making the module usable in power-sensitive embedded wireless products.

What is the difference between SPBT2632C2A.AT2 and SPBT2632C1A.AT2?

SPBT2632C2A.AT2 is the compact Bluetooth v3.0 Class 2 module with an 11.6 mm × 13.5 mm × 2.9 mm form factor. SPBT2632C1A.AT2 is the related Class 1 module with a larger 15.2 mm × 26.9 mm × 2.9 mm size. The Class 1 version is selected when longer Bluetooth range is more important than board footprint.

What package format is used by SPBT2632C2A.AT2?

SPBT2632C2A.AT2 uses a 16-pin surface-mount PCB module package measuring 11.6 mm × 13.5 mm × 2.9 mm. The module is intended for reflow assembly and includes the antenna, Bluetooth RF section, microcontroller, memory, firmware, and host-interface pins in a compact module footprint.