Datasheet
Page 45 of 161
nRF8001 Product Specification
Revision 1.2
13.4 Recommendations for low power operation
Obtaining low power operation and long battery lifetime is a compromise between cost and performance.
Here are some recommendations for obtaining suitable battery lifetimes:
• Use a reference source derived from an external high accuracy 32 kHz crystal source instead of the
internal 32 kHz RC oscillator. Improving the total timing accuracy within the system can significantly
reduce power consumption. This is a direct trade off of the cost of the 32.768 Khz crystal.
• Set Preferred Peripheral Connection Parameters for the application. The peer device operating in
the central role defines the connection parameters to use for that connection. However, the
peripheral device may request the peer device to change these to battery favorable parameters.
Connection Interval and Slave Latency are important parameters in achieving suitable battery
lifetime. These parameters are set by the ACI when nRF8001 is in the Setup mode as defined in
Part B section 22.3 on page 81
• Using the DC/DC converter reduces the active peak currents as defined in Table 15 on page 37
by
approximately 20%. Additional external components are required when the DC/DC converter is
enabled.
• Using the application latency feature (see section 6.7 on page 20
) can reduce average current
consumption if an application is running profiles that mainly consist of zero data but, that still require
a low latency link from the central device to the peripheral device.
• Enabling the Dynamic Window Limiting feature reduces the average current consumption on a link.