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Dual-mode system-on-module

Connect-Blue (Sweden) has launched the OBP421 system-on-module, which is a Bluetooth dual-mode module, also known as Bluetooth Smart Ready. The system employs Bluetooth version 4.0 with 300 m wireless range.

The integrated MCU eliminates the need for a double set of MCUs (Photo: Connect-Blue)

SINCE THE SYSTEM-ON-MODULE IS DUAL-MODE, it makes it possible to create, compile and link real C code embedded applications with the ability to access any connected Bluetooth Smart sensor using the Generic Attribute Profile (GATT). Examples of customer specific embedded application software written in C include protocol conversion, data logging, scaling and filtering of digital and analog I/O signals, HMI functionality, CAN connectivity, and I2C or SPI sensor connectivity.

The product is based on the Bluetooth serial port module OBS421. This module was equipped with an MCU, which laid the foundation for the OBP421 launch. This ARM Cortex-M3 32-bit RISC core operates at a 72 MHz frequency with embedded memories consisting of flash memory up to 384 KiB and SRAM up to 64 KIB. The micro-controller offers a range of I/Os, peripherals, 12-bit ADCs, general-purpose 16-bit timers, PWM timers, as well as communication interfaces like CAN, I2C, SPI and USART. It is particularly suitable in industrial, medical, and Internet of Things applications.

“Thanks to the powerful micro-controller, the OBP421 module can even be used as a complete host CPU replacement,” said Rolf Nilsson, CEO of Connect-Blue. “The customer can thus use our OBP421 for the entire system needs benefitting from the design, testing and type approvals already implemented in the OBP421. Thereby, the customer gets a compact system design on a proven hardware with full application flexibility gaining greatly on time-to-market and cost efficiency.”

Customers that have already purchased the Bluetooth serial port module can get system-on-module functionality by purchasing a starter kit for the application software implementation and sign a royalty-free software licensing agreement. The system-on-module offers GATT support for Bluetooth Smart, Android support and iOS support (Bluetooth low energy only). The module is radio type approved for USA, Europe, Japan, and Canada. It is also compliant with EMC, safety and medical standards, and Bluetooth qualified. Furthermore, the module has an embedded Bluetooth dual-mode stack, as well as a temperature range of -30 °C to +85 °C.

About Bluetooth dual-mode (Bluetooth Smart Ready)
Bluetooth dual-mode devices include both Bluetooth low energy and classic Bluetooth. A typical dual-mode device is a mobile phone, PC, as well as the Connect-Blue serial port adapter RBS421, serial port module OBS421, and system-on-module OBP421. Bluetooth low energy is for applications with low data rates at periodic intervals, while classic Bluetooth is optimized for streaming data at medium to high rates. Bluetooth low energy has inherited features such as Adaptive Frequency Hopping (AFH) from classic Bluetooth, but from an application perspective it is different.

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