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What factors affect the power consumption of low-power Bluetooth devices?

Last Updated on：2024-02-22 09:13:27

Broadcast interval, 20~10240ms, unit: 0.625ms. Under the same conditions, the larger the broadcast interval, the lower the power consumption.

Connection interval, 7.5~4000ms, unit: 1.25ms. Under the same conditions, the larger the connection interval, the lower the power consumption.

Transmission power

For Bluetooth LE 4.0/4.1/4.2, the transmission power is -20dBm~10dBm (0.01mW~10mW)
For Bluetooth LE 5/5.1, the transmission power is -20dBm~20dBm (0.01mW~100mW)
Under the same conditions, the smaller the transmission power, the lower the power consumption

Main frequency, commonly 6MHz, 12MHz, 16MHz, 24MHz, 48MHz, and 64MHz. Under the same conditions, the lower the main frequency, the lower the power consumption.

32K clock source. Under the same conditions, the more accurate the external low-frequency crystal oscillator, the lower the power consumption.

Voltage, generally ranging from 1.8V~3.6V. Under the same conditions, the lower the voltage, the lower the power consumption.

Power supply mode, including DC-DC and LDO. Under the same conditions, the DC-DC power supply mode is more power-efficient.

Broadcast data length. Under the same conditions, the shorter the broadcast data length, the lower the power consumption.

Sleep wake-up time. Under the same conditions, the shorter the sleep wake-up time, the lower the power consumption.

Chip peripherals. Different chips have a variety of peripherals, and when measuring chip power consumption, try to exclude the influence of peripheral power consumption.

For more power consumption related data, refer to Power Management.