BL654 datasheet(21/60 Pages) LSTD

21 / 60 page

https://www.lairdconnect.com/wireless-

modules/bluetooth-modules/bluetooth-5-

modules/bl654-series-bluetooth-module-nfc

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Power Consumption Notes:

possible to close the UART and get to the 3.1 uA current consumption regime and still be able to

detect for incoming data and be woken up so that the UART can be re-opened at expense of losing

that first character.

The BL654 Standby Doze current consists of the below nRF52840 blocks:

▪

nRF52 System ON IDLE current (no RAM retention) (0.7 uA)

– This is the base current of the CPU

▪

LFRC (0.7 uA) and RTC (0.1uA) running as well as 256k RAM retention (1.4 uA)

– This adds to the total of

3.1 uA typical. The RAM retention is 20nA per 4k block, but this can vary to 30nA per 4k block which would

make the total 3.7uA.

Note 3

In Deep Sleep, everything is disabled and the only wake-up sources (including NFC to wakeup) are reset and

changes on SIO or NFC pins on which sense is enabled. The current consumption seen is ~0.4 uA typical in

BL654 modules.

▪

Coming out from Deep Sleep to Standby Doze through the reset vector.

Note 4

Average current consumption depends on several factors (including Tx power, VCC, accuracy of 32MHz and

32.768 kHz). With these factors fixed, the largest variable is the advertising or connection interval set.

Advertising Interval range:

▪

20 milliseconds to 10240 mS (10485759.375 mS in BT 5.1) in multiples of 0.625 milliseconds.

For an advertising event:

▪

The minimum average current consumption is when the advertising interval is large 10240 mS

(10485759.375 mS in BT 5.1) although this may cause long discover times (for the advertising event) by

scanners

▪

The maximum average current consumption is when the advertising interval is small 20 mS

Other factors that are also related to average current consumption include the advertising payload bytes in

each advertising packet and whether it’s continuously advertising or periodically advertising.

Connection Interval range (for a peripheral):

▪

7.5 milliseconds to 4000 milliseconds in multiples of 1.25 milliseconds.

For a connection event (for a peripheral device):

▪

The minimum average current consumption is when the connection interval is large 4000 milliseconds

▪

The maximum average current consumption is with the shortest connection interval of 7.5 ms; no slave

latency.

Other factors that are also related to average current consumption include:

▪

Number packets per connection interval with each packet payload size

▪

An inaccurate 32.768 kHz master clock accuracy would increase the average current consumption.

Connection Interval range (for a central device):

▪

2.5 milliseconds to 40959375 milliseconds in multiples of 1.25 milliseconds.

BL654 Datasheet(PDF) 21 Page - Laird Tech Smart Technology

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