Bluetooth smart module offers “peripheral only” operating mode

April 24, 2017 // By Jean-Pierre Joosting
The AMB2621 Bluetooth Smart module from AMBER wireless GmbH, a Würth Elektronik eiSos Group company, offers a special feature that enables smartphones or other devices to be connected with the “peripheral only” operating mode as well as standard control with UART commands.

Extremely compact, the energy-saving AMB2621 is a 2.4 GHz BLE wireless module based on the Bluetooth Smart 4.2 standard, sized just 11- x 8- x 1.8-mm, offered with or without integrated antenna. AMBER wireless uses the Nordic chip nRF52832 in this module, i.e. a 32-bit ARM Cortex-M4 CPU and a 512 kB flash memory. The AMB2621 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.

“Our customers can install and use the module with ease, without having to previously configure it and without changing the interface in their application in a big way”, explains Patrick Becker, Head of Sales at AMBER wireless. “We purposefully introduced the option of operating the wireless module as ‘peripheral’ in the sense of the Bluetooth protocol, as this covers around 90 percent of applications. Devices are equipped with this kind of wireless module so you can connect with them. This means that pairing is initiated from a mobile device, for example to control building technology.”

Thanks to the “peripheral only” operating mode, the AMB2621 Bluetooth Smart module is especially energy-saving, as the UART (Universal Asynchronous Receiver Transmitter) 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.