CYBLE-224116-01
Document Number: 002-12524 Rev. *D
Page 17 of 47
Power Saving Measures with PA/LNA Operation
The section will describe power saving measures available for controlling the integrated PA/LNA on the CYBLE-224116-01 module.
Table 10
lists the states available through via the CSD and CPS logic control signals.
Table 10. PA/LNA Logic Controls and Power Modes
Power Optimization Tips with Extended Range Functionality
If left in High Power TX and High Gain RX mode continuously, the integrated PA/LNA on the CYBLE-224116-01 module will draw
more current than may be desired. Optimizing the average power consumption of the CYBLE-224116-01 module can be accomplished
via the CSD and CPS logic control signals explained in
Enabling Extended Range Feature
and shown in
Table 10
.
To minimize power consumption of a BLE solution that is utilizing the extended range feature of the CYBLE-224116-01, the PA/LNA
should be set to either Mode 0 (All Off) or Mode 1 (Standby). Transitioning the PA/LNA from Mode 3 (High Power and High Gain) to
either Mode 0 or 1 needs to be taken care of in the application firmware. The recommendations below should be followed when
changing modes of the PA/LNA on the CYBLE-224116-01 module.
1.To set the PA/LNA to a low power mode, either Power Mode 0 or Power Mode 1 should be entered just before the BLE application
firmware transitions the PSoC
®
4 BLE silicon device to a Sleep or Deep Sleep mode. To execute the transition of the PA/LNA to a
lower power mode, the below code should be used in the low power routine in the application firmware. Power Mode 0 and Power
Mode 1 PA/LNA commands are both shown.
2.When the BLE system is transitioning to Active mode (i.e. waking from low power mode) and extended range functionality is required,
it is necessary to enable the PA/LNA to Power Mode 3. Enabling the PA/LNA should be the first action completed during when
transitioning the PSoC
®
4 BLE silicon device from a low power mode to active mode. Enabling the PA/LNA to Power Mode 3 can
be completed using the following commands in the wakeup routine of the application firmware.
3.Power Mode 2 (TX/RX Bypass) is not recommended for typical low power mode use. Bypass mode should be considered if a
transition from Extended Range functionality to short-range communication is desired on-the-fly. Transitions from Active mode to
Bypass mode are only recommended after a BLE event has completed and no RF activity is in process.
PA/LNA Mode
CSD (P0[3]) Logic State CPS (P0[2]) Logic State
Description
0
0
0
All Off. Lowest Power Mode
PA and LNA are off
1
0
1
Standby Mode
Recommended mode for low power operation
2
1
0
TX and RX Bypass Mode
3
1
1
High Power TX and High Gain RX
/* Set the Skyworks SE2438T PA/LNA to Power Mode 0 (All Off)*/
CSD_Write(0);
CPS_Write(0);
/* Set the Skyworks SE2438T PA/LNA to Power Mode 1 (Standby)*/
CSD_Write(0);
CPS_Write(1);
/* Set the Skyworks SE2438T PA/LNA to Power Mode 3 (High Power and High Gain)*/
CSD_Write(1);
CPS_Write(1);
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