Data Sheet

Bluegiga – A Silicon Labs Company 6
BT121 overview
BT121 is a Bluetooth Smart Ready module targeted for applications that require both Bluetooth Smart and
Classic connectivity. It can connect to legacy devices that only support Bluetooth SPP or Apple
®
iAP2 profiles
as well to devices that support Bluetooth Smart. BT121 integrates a high performance Bluetooth radio, a low-
power ARM Cortex micro-controller and a Bluegiga Bluetooth Smart Ready stack software marking it
extremely easy-to-use as no RF or Bluetooth software development is needed. BT121 can be used as a
modem together with a separate host MCU, but applications can also be embedded into the built-in ARM
®
Cortex
®
MCU with the Bluegiga BGScript
TM
scripting language.
1.1 Key Features
Bluetooth features
 Bluetooth 4.1 Smart Ready compliant
 Master and slave modes
 Up to 6 x BR/EDR connections
 Up to 7 x BLE connections
 1 x BR/EDR + 7 x BLE connections
simultaneously
Radio features
 Integrated antenna
 TX Power
o +12 dBm with Bluetooth BR/EDR
o +10 dBm with Bluetooth LE
 RX Sensitivity
o -96 dBm
 200-400 meter LoS range
Software features
 Integrated Bluetooth Smart Ready Stack
 SPP, iAP2, GATT over BR Bluetooth profiles
 Any GATT based Bluetooth Smart profile
 1000 kbps throughput over SPP
 150 kbps throughput over iAP2
 100 kbps throughput over BLE
 BGAPI
TM
serial protocol API over UART for
modem usage
 BGLIB
TM
host API/library which implements
BGAPI serial protocol
 BGScript
TM
scripting language for standalone
usage
 Profile Toolkit
TM
for creating GATT based
services
Hardware interfaces
 UART host interface
 2 x SPI, UART and 2 x I2C peripheral interfaces
 Up to 22 x GPIO with interrupts
 4 x 12-bit ADC and 2 x 12-bit DAC*
 Internal temperature sensor*
 Internal battery voltage measurement option*
 Clock generator*
 RTC with calendar*
Microcontroller
 ARM Cortex M0
 48 Mhz
 16kB RAM
 128kB flash
Electrical characteristics
 Supply voltage: 2.2V to 3.6V
 Supply voltage: 2.4V to 3.6V when using ADC
Environmental and regulatory
 Temperature range: -40C to +85C
 Bluetooth, CE, FCC and IC, Japan and South-Korea
qualified*
Dimensions:
 W x L x H: 11.0 mm x 13.9 mm x 2.2 mm
*) Feature not implemented on engineering samples and engineering samples are not qualified