The following tables give you an idea of the average current draw in three different operating modes with the Bluefruit LE UART Friend:
- Fast Advertising Mode (the first 30 seconds after power up)
- Slow Advertising Mode (>30s since power up)
- Connected Mode (using the UART profile in this case)
Test Conditions
The board was powered from a fully charged 1200mAh 4.2V LIPO cell running at 4.2V. Power efficiency will generally increase as the LIPO battery voltage drops, so 4.2V should be considered a worst case scenario.
- Power Supply: 1200mAh 4.2V LIPO Cell (at 4.2V)
- Firmware: 0.6.2
Fast Advertising Mode
The first 30 seconds that the Bluefruit LE UART Friend is powered up it will enter 'Fast Advertising Mode', which sends an advertising packet once every 100ms.
- Average Current: 1.44mA
- Peak Current: 13.5mA
- Expected Battery Life: 832 hours (~34.6 days)
Slow Advertising Mode
After 30 seconds the Bluefruit LE UART Friend will enter 'Slow Advertising Mode', which sends an advertising packet once every 546.25ms.
- Average Current: 1.25mA
- Peak Current: 13.5mA
- Expected Battery Life: 956 hours (~40 days)
Connected Mode (UART)
The following measurements illustrate the average current draw in connected mode (with the connected LED enabled). UART mode was used as a test case.
- Average Current: 1.86mA
- Peak Current: 15.2mA
- Expected Battery Life: 645 hours (~26.8 days)
