Datasheet

Page 40 of 161
nRF8001 Product Specification
Revision 1.2
connection interval. The communication time is defined as the time that the Bluetooth low energy devices
maintain the physical radio connection. It consists of one or more connection events separated in time by
the connection interval. I
sleep
is defined as the current consumption between communication intervals.
Segment b) of Figure 17. on page 39
illustrates the periodicity of the connection interval. The average
current drain of each connection event depends on the link parameter settings and ACI activity. I
idle
is
defined as the current drain between connection events.
Segment c) of Figure 17. on page 39
illustrates a typical current drain profile for a connection event. Each
connection event consists of the following states and operations (the numbers below correspond to the
numbers displayed in segment c) of Figure 17. on page 39
):
1. Radio pre-processing period
2. Active radio receive time
3. Radio Inter Frame Space (T_
IFS
)
4. Active transmit time
5. Link layer post processing period
6. Data post processing period, enabled only if data has been received
Figure 18.
shows the average current consumption (with and without the DC/DC converter enabled) as a
function of the length of the connection interval.
Figure 18. Graph showing average current consumption as a function of connection interval length