Silicon Labs BT121-A-V2 Bluetooth Chip 1.3

BT121 is a Bluetooth 4.1 Smart Ready compliant module that integrates a high performance Bluetooth radio, a low-power ARM Cortex microcontroller and a Bluegiga Bluetooth Smart Ready stack. This Smart Ready device provides simultaneous BR/EDR and BLE connectivity , communicating with both Bluetooth Classic and Low-Energy enabled devices.
The BT121 can be used with a separate host microcontroller, but user applications can also be embedded into the Flash microcontroller with the Bluegiga BGScript scripting language.

Bluetooth 4.1 Smart Ready compliant
Carrier Frequency: 2402 to 2480MHz over 78 channels
RF Output Power: +8dBm (BLE), +12dBm (BR/EDR)
Receiver Sensitivity: -96dBm (BLE)
OTA Data Rate: 1Mbps (SPP), 300kbps (iAP2), 100kbps (BLE)
Up to 7 x BLE (Bluetooth Low Energy) connections
Integrated antenna
Embedded Bluetooth Smart Ready stack
SPP, iAP2, GATT over BR Bluetooth profiles
BGAPI™ serial protocol API over UART for modem usage
BGLIB™ host API/library which implements BGAPI serial protocol
BGScript™ scripting language for standalone usage
48MHz Cortex-M0 core microcontroller with 128KB Flash memory, 16KB RAM
Host communication: serial UART with RTS/CTS flow control
2 x SPI, UART and 2 x I²C peripheral interfaces
Up to 22 x GPIO with interrupts
4 x 12-bit ADC channels and 2 x 12-bit DAC channels
Real-Time-Clock
Power supply: +2.2V to +3.6Vdc
Operating temperature range: -40 to +85°C
Bluetooth, CE, FCC, IC, South-Korea and Japan qualified
Applications: Health & fitness, PoS (point-of-sales), M2M connectivity, Automotive aftermarket, Industrial & home automation gateways, Local communication for the Internet of Things (IoT)