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AIROC™ Bluetooth® LE module
Power management unit
13
Power management unit
The Power management unit (PMU) provides power management features that can be invoked by software
through power management registers or packet-handling in the baseband core.
13.1
RF power management
The BBC generates power-down control signals for the transmit path, receive path, PLL, and power amplifier to
the 2.4-GHz transceiver, which then processes the power-down functions accordingly.
13.2
Host controller power management
Power is automatically managed by the firmware based on input device activity. As a power-saving task, the
firmware controls the disabling of the on-chip regulator when in Deep Sleep (HIDOFF) mode.
13.3
BBC power management
There are several low-power operations for the BBC:
• Physical layer packet handling turns RF on and off dynamically within packet TX and RX.
• Bluetooth®-specified low-power connection mode. While in these low-power connection modes, the
CYBLE-3x307x-02 runs on the low power oscillator and wakes up after a predefined time period.
The CYBLE-3x307x-02 automatically adjusts its power dissipation based on user activity. The following power
modes are supported:
• Active mode
• Idle mode
• Sleep mode
• HIDOFF (Deep Sleep) mode
The CYBLE-3x307x-02 transitions to the next lower state after a programmable period of user inactivity. Busy
mode is immediately entered when user activity resumes.
In HIDOFF (Deep Sleep) mode, the CYBLE-3x307x-02 baseband and core are powered off by disabling power to
VDDC_OUT and PAVDD. The VDDO domain remains powered up and will turn the remainder of the chip on when
it detects user events. This mode minimizes chip power consumption and is intended for long periods of
inactivity.
Preliminary Datasheet
34 of 58
002-33419 Rev. **
2021-07-22
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