Overview
The BT121-A-V2 from Silicon Labs is a Bluetooth Dual Mode module designed to support both Bluetooth Low Energy (BLE) and Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) connectivity. This module is ideal for applications that require seamless communication with both legacy and modern Bluetooth devices. It features an integrated ARM Cortex-M0 microcontroller and the Bluegiga Bluetooth Dual Mode stack software, making it easy to use without the need for RF or Bluetooth software development.
Key Specifications
| Specification | Details |
|---|---|
| Bluetooth Version | Bluetooth 4.1 Dual Mode compliant |
| Connections | Up to 6 BR/EDR connections, up to 7 BLE connections, and combinations thereof (e.g., 1+6, 2+5, etc.) |
| Radio Features | Integrated antenna, TX Power: +12 dBm (BR/EDR), +8 dBm (BLE), RX Sensitivity: -96 dBm |
| Range | Up to 200-400 meters Line of Sight (LoS) |
| Microcontroller | ARM Cortex-M0, 48 MHz, 16kB RAM, 128kB flash |
| Supply Voltage | 2.2V to 3.6V |
| Temperature Range | -40°C to +85°C |
| Dimensions | 11.0 mm x 13.9 mm x 2.2 mm (W x L x H) |
| Certifications | Bluetooth, CE, FCC, IC, Japan, and South-Korea qualified |
| Interfaces | UART, 2 x SPI, 2 x I2C, up to 22 x GPIO with interrupts |
Key Features
- Central and peripheral modes for both BR/EDR and BLE
- Integrated Bluetooth Dual Mode Stack and BGScriptTM scripting language for standalone usage
- SPP, iAP2, HID, and GATT over BR Bluetooth profiles; any GATT-based Bluetooth LE profile
- 1000 kbps throughput over SPP
- BGAPITM serial protocol API over UART for network co-processor usage
- BGLIBTM host C library and Profile ToolkitTM for creating GATT-based services
- 4 x 12-bit ADC and internal battery voltage measurement option
- Touch pad sensing and various timer functions
Applications
The BT121-A-V2 is versatile and can be used in a wide variety of applications, including:
- Cable replacement
- HID (Human Interface Devices)
- Health and fitness devices
- Point-of-Sales (PoS) systems
- Other applications requiring dual-mode Bluetooth connectivity
Q & A
- What is the Bluetooth version supported by the BT121-A-V2?
The BT121-A-V2 supports Bluetooth 4.1 Dual Mode.
- How many simultaneous connections can the BT121-A-V2 support?
It can support up to 6 BR/EDR connections and up to 7 BLE connections, with various combinations thereof.
- What is the range of the BT121-A-V2 module?
The module has a range of up to 200-400 meters Line of Sight (LoS).
- What microcontroller is used in the BT121-A-V2?
The module uses an ARM Cortex-M0 microcontroller.
- What are the supply voltage and temperature range for the BT121-A-V2?
The supply voltage range is 2.2V to 3.6V, and the temperature range is -40°C to +85°C.
- What certifications does the BT121-A-V2 hold?
The module is certified by Bluetooth, CE, FCC, IC, Japan, and South-Korea.
- What interfaces are available on the BT121-A-V2?
The module features UART, 2 x SPI, 2 x I2C, and up to 22 x GPIO with interrupts.
- Can the BT121-A-V2 be used as a standalone device or does it require an external host MCU?
The BT121-A-V2 can be used both as a standalone device with the built-in ARM Cortex-M0 MCU and as a modem with a separate host MCU.
- What software tools are available for the BT121-A-V2?
The module supports BGScriptTM scripting language, BGLIBTM host C library, and Profile ToolkitTM for creating GATT-based services.
- Is the BT121-A-V2 suitable for use in life support systems or military applications?
No, the BT121-A-V2 is not designed or authorized for use in life support systems or military applications without specific written consent from Silicon Labs.
