New from Amber Wireless, the AMB2621 Bluetooth Smart module has a special feature in that, besides standard control with UART commands, smartphones or other devices can be connected to form a module by initialising with the ‘peripheral only’ operating mode.
Based on the Bluetooth Smart 4.2 standard, the 2,4 GHz BLE module measures just 11 x 8 x 1,8 mm and is offered with or without integrated antenna. Nordic Semiconductor’s nRF52832 powers the module, giving it a 32-bit ARM Cortex-M4 CPU and a 512 KB Flash memory.
The firmware supports the ‘peripheral only’ operating mode allowing easy expansion of existing hardware with the BLE interface. In its default state, this mode provides static key pairing and a transparent UART interface. This gives the AMB2621 energy-saving properties, as the UART interface is only active once a wireless connection is established. Uncomplicated static passkey pairing is used as a security device as in the hands-free system in the car.
The module is suitable for all manufacturers wishing to connect their electronic control with a mobile device. It does not make a difference whether this control has been on the market for years or is just in the development phase. AMB2621 with peripheral mode is recommended whenever the module itself does not initiate any connections (i.e. is only contacted from the outside) or no user interface can be implemented, as the rest of the product is already ready.
All BLE profiles can be used with the AMB2621, i.e. besides the ‘peripheral’ profile mentioned, ‘central’, ‘observer’ and ‘broadcaster’ profiles. The latter means sending beacons. Control of the module with commands allows numerous individual configurations. This enables electricity consumption, various pairing methods, emitting powers, UART speeds or the use of the power saving mode to be set with 1 μA. The module can also be used for determining position by means of triangulation.
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