Datasheet

Page 39 of 161
nRF8001 Product Specification
Revision 1.2
13 Dynamic current consumption
To predict battery lifetime, it is important to understand how the hardware and Bluetooth low energy
protocol parameters influence the overall power consumption.
The connection and advertising events consist of a sequence of radio transmissions, each of which has
individual current drain. The average power consumption of an event is calculated by integrating the
current drain over the duration of the event.
Peak current consumption data is found in section 12.4 on page 36
.
13.1 Current consumption - connection
Figure 17. illustrates the principle of current drain over time for a typical Bluetooth low energy device that is
connected. The maximum peak-current drain occurs when the receiver is active (I
peak_RX
).
Figure 17. Current consumption over time for a typical nRF8001 connection event
Segment a) of Figure 17. shows a typical scenario. A connection is defined as a physical radio connection
between two
Bluetooth low energy devices. This may consist of several connection events at a given
Not in connection
Connected
I
VDD
t
I
sleep
t
I
sleep
I
idle
Connection interval
I
VDD
I
VDD
t
I
RX
I
TX
12345 6
I
idle
a)
b)
c)
I
peak
Connection event
Active time
I
MCU_LL
I
MCU_HOST
I
Standby
I
TFS