Data Sheet

Document Number: 002-28053 Rev. ** Page 26 of 47
CYBT-343052-02
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.
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 trans-
ceiver, which then processes the power-down functions accordingly.
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.
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 CYBT-343052-02 runs on the
Low Power Oscillator and wakes up after a predefined time period.
The CYBT-343052-02 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 CYBT-343052-02 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 CYBT-343052-02 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.