BL620 - Bluetooth BLE module featuring smartBASIC and Central Mode connectivity

The BL600 Series modules from Laird have been enhanced with the addition of the BL620 modules. The BL620 uses the same module hardware as the BL600 but has firmware supporting Central mode connectivity.

The BL620 makes it easy to add single-mode Bluetooth Low Energy (BLE), also known as Bluetooth Smart™, to small, portable, power-conscious devices, including those powered by AAA or coin cell batteries.

The unique feature of this module is smartBASIC, an event-driven programming language that enables standalone operation of the module. smartBASIC on BL620 enables wireless connections to peripheral devices that are in turn connected to sensors so that the data can be collected via GATT operations. smartBASIC has been proven to speed time to market and significantly simplifies BLE integration for embedded devices.

Based on the award winning Nordic Semiconductor nRF51822 chipset, BL620 modules provide exceptionally low power consumption with outstanding wireless range, all within a compact footprint of 19 mm x 12.5 mm. The modules incorporate all the hardware and firmware required to support development of BLE Central mode applications, including:

  • Radio hardware
  • UART, SPI, I2C, ADC, and GPIO interfaces for connecting peripherals and sensors
  • A complete BLE software stack
  • Central role functionality with GATT client and server - Ability to connect up to four simultaneous connections
  • Custom Services to suit any application's needs
  • Series addition of a packaged USB Dongle - BL620-US

In addition to carrying FCC modular, IC, MIC, and CE approvals, BL620 modules are fully qualified as a Bluetooth End Products, enabling designers to integrate the modules in devices without the need for further Bluetooth Qualification testing.


For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

Feature Specification
Bluetooth V4.0 - Central Mode
Frequency 2.402 - 2.480GHz
Max Tx Power


Rx Sensitivity -91dBm (Typical)
Whisper Mode Down to -55dBm (Transmit)
Link Budget 95dB (@1Mbps)
Raw Data Rates 1Mbps (over the air)
Host Interfaces
Total 28 lines - multi-function


DTR, DSR, DCD, RI can be implemented in smartBASIC (CTS, RTS, DTR, DSR, DCD and RI are NOT connected on the BL620-US)

Default 9600, N, ,8, 1

From 1,200 to 115,200bps

GPIO Up to 28 lines
SPI 3 lines
I²C 2 lines
ADC 6 lines (plus ADC reference)
Services GATT Client and Server capability
Control Protocols
Control Protocols Any that can be implemented using smartBASIC
AES 128 bit using CCM encryption
Supply Voltage

1.8 - 3.6V - internal LDO

2.1 - 3.6V - internal DCDC converter

Power Consumption

'System Idle' - 3.5uA

'Transmit' - 10.5mA @ 0dBm

Internal Antenna Multilayer Ceramic - BL620-SA-xx
External Antenna Connection via IPEX4 - BL620-SC-xx
Trace Pin Trace Pin  - BL620-ST-xx

19mm x 12.5mm x 3mm

Operating Temperature

-25°C to +75°C (when powered at 1.8V)

-40°C to +85°C (when powered at 3.3V ± 10%)

Storage Temperature -40°C to +85°C
Lead free Lead-free and RoHS compliant
Bluetooth End Product Listing (EPL) Approved

All BL620 series


Lead-free and RoHS compliant

Part No.
Pack Sizes
BLE Module featuring smartBASIC (internal antenna)

Packs of 50


BLE Module featuring smartBASIC (internal antenna)

Tape & reel packaging

Tape & reel, 600 pcs
BLE Module featuring smartBASIC (IPEX MHF4 antenna connector)
Packs of 5

BLE Module featuring smartBASIC (IPEX MHF4 antenna connector)

Tape & reel packaging

Tape & reel, 600 pcs
BL620-ST-xx BLE Module featuring smartBASIC (trace pin)

BLE Module featuring smartBASIC (trace pin)

Tape & reel packaging

Tape & reel, 600 pcs
DVK-BL600-SA-xx Bluetooth development Kit for BL600-SA (Upgrade the BL600 module with BL620 firmware) Each
DVK-BL600-SC-xx Bluetooth development Kit for BL600-SC (Upgrade the BL600 module with BL620 firmware) Each
DVK-BL600-ST-xx Bluetooth development Kit for BL600-ST (Upgrade the BL600 module with BL620 firmware) Each
QPK-nRF5x-01 Laird development board for FW upgrade of BL6xx and RM1xx series wireless modules. Includes: programming board, 1 x USB-A to USB micro cable & 1 x 10-pin flexi cable. REACH & RoHS. Each

xx - Current firmware version at time of ordering

The BL600 development board is a universal development tool, used to highlight the capabilities of the BL600 module. The development kit is supplied in a default configuration which should be suitable for multiple experimentation options. It also offers a number micro-DIP switches that help isolate on-board sensors and UART from the BL600 module to create different configurations. This allows you to test different operating scenarios.AlphaMicro_Laird_BL600_DVK_SA_set_300px

The BL600 development board has the following features:

  • BL600 series module soldered on-board.
  • Power supply options for powering development board from:- USB- external DC supply- AAA batteries (3xAAA battery holder fitted on underside of development board)
  • Regulated 3.3 V for powering the BL600 module. Optional regulated 1.8 V for powering the BL600 module.
  • Power supply option for coin cell operation of the BL600 series module only (not development board).
  • USB to UART bridge (FTDI chip).
  • BL600 UART can be interfaced to:- USB (PC) using the USB-UART bridge- External UART source (using IO break-out connector when development board powered from DC jack)
  • Current measuring (for BL600 module only) options:- Pin header (Ammeter)- Current shunt monitor IC (volt meter or oscilloscope)- Series resistor for differential measurement (oscilloscope)
  • IO break-out (four 2x5-pin 2.54mm pitch headers) connectors interface for plugging-in external modules/sensors, and accessing all interfaces of the BL600 module [UART, SPI, I2C, SIO (DIO or AIN (ADCs)].
  • Two Buttons and two LEDs for user interaction.
  • Two on-board sensors (analogue output): Temperature and Trim Pot.
  • One buzzer.
  • Micro DIP switches that allow the on-board sensors, LED's (and USB UART FTDI bridge) to be disconnected from BL600 module.
  • SMA connector (reverse SMA) for an external antenna. This is only applicable to BL600-ST module variant (with RF brought out to edge pads).
  • smart BASIC runtime engine FW upgrade capability:
    • Via JTAG using the supplied Segger J-Link programmer
  • smart BASIC application upgrade capability:
    • Via UART (using the FTDI USB-UART).

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Last updated: 4 May 2017