It’s also possible to go to a deeper sleep mode where no RTC is running and the system in a low power mode, but this prevents a smartphone from connecting to a device. The average current of the system is then higher and depends on how often the system wakes up to send data. If the device wakes up periodically, then the current peaks for a few milliseconds during transmission and reception. When in sleep, the CPU is off, the BLE Radio isn’t transmitting, and most peripherals are stopped as well. This figure accounts for a running a Real Time Clock (RTC) which wakes the system periodically to advertise or send data. How much current they draw during sleep depends on the device, but a figure of around 1.5uA is typical of many SoCs. Most BLE products are designed to stay asleep as much as possible to conserve power, waking up to process and send data. Which part consumes more depends mainly on the application and duty cycle. Some BLE radios can reach a peak of 20mA when transmitting (or more if the output power increased). The Bluetooth radio is another part that can consume significant amounts of power. The processor can draw several mA when running. Power consumption in BLE SoCs is typically due to the processor and the BLE radio. Peripherals – I2C, SPI, UART, PWM, GPIO.BLE Radio – Complete radio and stack needed to connect to other BLE devices.Most modern BLE SoCs are very sophisticated devices that integrate almost everything needed to build a complete smart device: Their current consumption profile has a large effect on the product lifetime. Most BLE devices today are System on Chip (abbreviated SoCs). BLE Current Consumptionīefore we start talking about the batteries, we have to understand the BLE devices themselves and their power requirements. As always, feel free to get in touch if you have questions. Every product and application is different, but with this information you can make better choices. This guide is designed to give you a broad overview of the choices in powering BLE products and the practical issues surrounding their use. Besides the popular Coin Cell batteries you will also see Alkaline, Lithium and many other chemistries. Since BLE was designed from the ground up for low power battery devices, it’s common to see a wide range of batteries used in designs.
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