The Central mode function allows the BL620 to operate as a gateway device, receiving data from another BLE device such as a sensor and then forward it on to a cloud-based service. Central mode devices can typically be used within a smartphone, tablet or a home gateway unit. Applications running on a central mode device can perform a number of features not available when running in the BLE Peripheral mode. These include updating or triggering web services and opening a URL. Central mode also added GATT client and server services with the ability to have four simultaneous connections.
Measuring 19 x 12.5 x 3mm the BL620 module consumes 3.5uA in idle mode and up at 10.5mA when transmitting at 0dBM. Maximum transmit power is 4dBM and the receiver sensitivity is typically -91dbM. Peripheral support includes UART, SPI, I2C together with an ADC and 28 GPIO pins.
The module supports Bluetooth application profiles including those of Heart Rate Service, Health Thermometer and Blood Pressure Service.
