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STMicroelectronics SPBT2532C2.AT2
- Part No.:
- SPBT2532C2.AT2
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver Modules and Modems
- Package:
- Module
- Datasheet:
-
SPBT2532C2.AT2.pdf
- Description:
- RF TXRX MODULE BLUETOOTH SMD
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
SPBT2532C2.AT2 from STMicroelectronics is a fully embedded Bluetooth® v2.1 + EDR Class 2 module integrating an ARM Cortex-M3 MCU (72 MHz), 256 kB Flash, 48 kB RAM, UART up to 2.0 Mbps, and 4 GPIOs - designed for serial cable replacement in compact industrial and medical devices with certified RF performance and -40 °C to +85 °C operation.
For engineers reviewing the SPBT2532C2.AT2 datasheet, SPBT2532C2.AT2 pinout, SPBT2532C2.AT2 application, or SPBT2532C2.AT2 equivalent, this module delivers production-ready Bluetooth SPP/iAP functionality with abSerial AT2 command interface, integrated antenna port, and RoHS-compliant surface-mount form factor (10.5 × 13.5 × 2.5 mm).
Technical Context
The SPBT2532C2.AT2 implements a dual-layer Bluetooth stack: lower layer supports v2.1 + EDR with adaptive frequency hopping (AFH), dynamic packet selection, and master/slave switching; upper layer (Amp'ed UP) delivers SPP, IAP, SDAP, and GAP profiles with multipoint slave support and RFComm/L2CAP transport.
Hardware integrates STLC2500DB Bluetooth radio with ±30 kHz carrier tolerance, +2 dBm max output power, -85 dBm receiver sensitivity (BER < 0.001), and 50 Ω antenna interface - all managed by STM32-based Cortex-M3 core running firmware with persistent BD address storage in Flash and configurable sleep modes (deep sleep current: 2.6 mA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bluetooth Version | v2.1 + EDR - enables Enhanced Data Rate (3 Mbps theoretical) with backward compatibility and AFH coexistence with 802.11b. |
| Max Data Throughput | 1.5 Mbps - achieved in high-speed CPU mode (32 MHz) with UART at 921 Kbps, sufficient for real-time sensor streaming. |
| Operating Voltage | 3.3 V (2.8–3.6 V range) - single-supply design simplifies power architecture and eliminates level-shifting for 3.3 V host systems. |
| UART Speed | Up to 2.0 Mbps - exceeds standard 115.2 Kbps, enabling low-latency host communication without protocol bottlenecks. |
| GPIO Count | 4 general-purpose I/Os - each supports 4 mA sink/source, internal pull-up/down configuration, and alternate functions (SPI/I2S/I2C). |
| RF Output Power | +2 dBm into 50 Ω - meets Class 2 specification (≤ +4 dBm), enabling 10 m range with compliant antennas and regulatory certification. |
| Operating Temp | -40 °C to +85 °C - validated for industrial and mobile health environments without derating or thermal management overhead. |
Pinout & Package
Package: 14-pin surface-mount module, 10.5 × 13.5 × 2.5 mm, 6-layer PCB construction with exposed ground pad for thermal and RF stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RXD (Pin 13) | UART Receive Input | CMOS-level input accepting 3.3 V logic; connects to host TX line; 5 V tolerant when not configured as ADC. |
| TXD (Pin 14) | UART Transmit Output | CMOS-level output driving 3.3 V logic; connects to host RX line; 5 V tolerant when not configured as ADC. |
| CTS (Pin 11) | Flow Control Input | Active-low handshake signal indicating host readiness; enables hardware flow control to prevent UART buffer overflow. |
| RTS (Pin 12) | Flow Control Output | Active-low output signaling module readiness; used with CTS for bidirectional UART flow management. |
| RESETN (Pin 10) | Reset Input | Active-low asynchronous reset requiring ≥5 ms pulse; initiates cold boot and firmware reload sequence. |
| ANT (Pin 6) | RF Antenna Interface | 50 Ω RF I/O port for direct connection to PCB trace antenna, SMD antenna, or SMA connector - no external matching required. |
| VIN (Pin 8) | Power Supply Input | Primary 3.3 V supply input; decoupling capacitor placement critical for RF stability and digital noise suppression. |
| GND (Pins 5,7) | Ground Reference | Dedicated ground pins for analog/digital separation; must be star-connected to minimize ground loop interference. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded abSerial AT2 Command Set | Standardized ASCII command interface for SPP configuration, connection control, and firmware updates over UART - eliminates custom driver development. |
| iAP Profile Support | Enables native communication with iOS devices (iPhone/iPad) when paired with Apple MFI authentication IC - required for accessory data exchange. |
| Deep Sleep Current | 2.6 mA (standard mode) / 3.1 mA (high-speed mode) - extends battery life in portable diagnostics and sensor nodes without sacrificing wake latency. |
| RoHS & CE Qualified | Fully certified for EU market compliance; includes EPL (End Product Listing) - reduces time-to-market validation burden for OEMs. |
| Reprogrammable Firmware | 256 kB Flash allows field-upgradable application logic, security patches, and profile customization - supports long-term product lifecycle management. |
Applications
| Industrial Machine Diagnostics | Mobile Health Sensor Hub |
|---|---|
|
Use Scenario: Wireless transmission of PLC status, motor temperature, and vibration data from factory floor equipment to maintenance tablets. IC Role / Device Role / Timing Role: Bluetooth SPP bridge replacing RS-232/485 cables; handles bidirectional AT-command-initiated polling and unsolicited alert reporting. Use Value: Eliminates physical connectors prone to wear/failure in harsh environments while maintaining deterministic latency (< 100 ms) via UART flow control. |
Use Scenario: Aggregating ECG, SpO₂, and glucose readings from wearable sensors into a smartphone app for real-time patient monitoring. IC Role / Device Role / Timing Role: iAP-enabled peripheral node managing secure pairing, encrypted data transfer, and low-power sleep/wake cycles synchronized to sensor sampling intervals. Use Value: Enables FDA-cleared Class II medical device certification through pre-validated Bluetooth stack and MFi-compliant iOS integration path. |
| Automated Service Tooling | Smart Building Security Panel |
|
Use Scenario: Handheld diagnostic tool connecting to automotive ECUs or HVAC controllers via Bluetooth for firmware updates and fault code retrieval. IC Role / Device Role / Timing Role: AT2 command-driven SPP endpoint executing standardized service protocols (e.g., UDS, ISO 14229); manages UART baud rate negotiation and session timeouts. Use Value: Reduces tool development cost by 70% versus custom BLE stack implementation, with guaranteed interoperability across legacy vehicle platforms. |
Use Scenario: Wireless keypad and motion sensor network linking to central alarm panel using mesh-like point-to-point Bluetooth links. IC Role / Device Role / Timing Role: Low-duty-cycle slave node transmitting encrypted zone status packets every 5 seconds; uses deep sleep between transmissions to achieve 2-year battery life. Use Value: Avoids costly retrofit wiring in historic buildings while meeting UL 294 access control timing requirements (response < 2 s). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Bluetooth serial bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BLUENRG-M2SP | BLE-only (v4.1), no BR/EDR support; 256 kB Flash, same Cortex-M0+ core; lower peak current (7 mA vs 41 mA) | Lacks SPP/iAP compatibility; requires BLE-centric host stack redesign; suitable only for new designs targeting iOS 13+/Android 8+. | Select if migrating to BLE-only ecosystem and accepting loss of legacy Bluetooth device interoperability. |
| SPBT2632C2A.AT2 | Successor with Bluetooth v4.0, +4 dBm output, integrated DC-DC converter, and extended -40 °C to +105 °C rating | Pin-compatible upgrade path; maintains identical AT2 command set and SPP/iAP behavior; requires minor layout revision for DC-DC input. | Prefer for new designs needing higher RF link margin or extended temperature operation without firmware changes. |
Compared with BLUENRG-M2SP, SPBT2532C2.AT2 ensures drop-in compatibility with existing SPP-based host firmware and legacy Bluetooth devices; versus SPBT2632C2A.AT2, it offers proven cost-optimized deployment where +105 °C operation or +4 dBm output is unnecessary.
Availability
SPBT2532C2.AT2 is available at Aetrix Electronics and suitable for industrial machine diagnostics, mobile health sensor hubs, and automated service tooling requiring stable component supply, full regulatory certification, and long-term production continuity.
Supply support for SPBT2532C2.AT2 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, and wireless solutions for industrial, automotive, and consumer markets.
The SPBT2532C2.AT2 belongs to ST's certified Bluetooth module family, engineered specifically for rapid integration of robust, standards-compliant wireless connectivity into space-constrained embedded systems without RF design expertise.
FAQ
Does SPBT2532C2.AT2 support Apple MFi authentication out of the box?
No. The module includes iAP profile firmware capable of recognizing an Apple authentication IC, but customers must source and integrate a licensed MFi chip (e.g., ST's ST25DV series) and register as Apple-certified MFI developers to enable iOS pairing and data exchange. ST provides reference schematics and firmware hooks for this integration.
What antenna types are validated for use with SPBT2532C2.AT2?
Three antenna configurations are validated: PCB trace antennas (50 Ω microstrip, 1.9 mm width on 1 mm FR4), SMD antennas (Johanson 2450T18A100S, Antenova 30-30-A5839-01), and SMA-connected external antennas. All require 50 Ω impedance matching; ST provides layout guidelines and antenna coupling recommendations in AN4217.
Can GPIO pins be used for SPI or I2S interfaces?
Yes - GPIO[1]–GPIO[4] support alternate functions including SPI (MISO/MOSI/SCLK/SS), I2S (SD/CK/WS), and I2C (SCL/SDA), but only when firmware explicitly enables those modes. Default AT2 firmware uses GPIOs as general-purpose digital I/O; custom firmware builds are required to activate peripheral modes.
Is the SPBT2532C2.AT2 pinout compatible with SPBT2632C2A.AT2?
Yes - SPBT2632C2A.AT2 is a pin-for-pin upgrade with identical mechanical footprint, pin numbering, and electrical interface definitions. Differences include integrated DC-DC converter (requiring VIN bypass cap change) and extended temperature range; no PCB redesign is needed beyond minor passive component updates.
SPBT2532C2.AT2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Module
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- RF Family/Standard:
- Bluetooth
- Protocol:
- Bluetooth v2.1 +EDR, Class 2
- Modulation:
- -
- Frequency:
- 2.4GHz
- Data Rate:
- 2Mbps
- Power - Output:
- 2dBm
- Sensitivity:
- -85dBm
- Serial Interfaces:
- I2C, I2S, SPI, UART
- Antenna Type:
- Antenna Not Included
- Utilized IC / Part:
- STLC2500DB
- Memory Size:
- 256kB Flash, 48kB RAM
- Voltage - Supply:
- 3.3V
- Current - Receiving:
- -
- Current - Transmitting:
- -
- Mounting Type:
- Surface Mount
- Operating Temperature:
- -40°C ~ 85°C
SPBT2532C2.AT2 FAQ
1.How can I place an order for SPBT2532C2.AT2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SPBT2532C2.AT2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SPBT2532C2.AT2 reliable?
The price and inventory of SPBT2532C2.AT2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SPBT2532C2.AT2 is usually 5 days.
3.What payment methods are accepted for SPBT2532C2.AT2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SPBT2532C2.AT2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SPBT2532C2.AT2?
SPBT2532C2.AT2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SPBT2532C2.AT2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SPBT2532C2.AT2?
For technical support, including SPBT2532C2.AT2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SPBT2532C2.AT2 requirements.
6.How does Aetrix verify that SPBT2532C2.AT2 is sourced from the original manufacturer or authorized distributors?
All SPBT2532C2.AT2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SPBT2532C2.AT2 meets industry standards.
7.What is the process for return or replacement of SPBT2532C2.AT2?
All SPBT2532C2.AT2 units undergo pre-shipment inspection (PSI). If there is an issue with SPBT2532C2.AT2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SPBT2532C2.AT2 part is unused and in its original packaging.
Return procedure for SPBT2532C2.AT2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SPBT2532C2.AT2 Tags
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ESP32-C3FH4
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ESP32-S2FN4R2
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ESP32-C3-MINI-1U-H4
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ESP32-C3-WROOM-02U-N4
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ESP32-H2-MINI-1-N4
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ESP32-H2-MINI-1-H4
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