User's Manual

Document Number: 002-19043 Rev. PRELIMINARY Page 11 of 33
PRELIMINARY
CYBLE-413136-01
Power Management Unit
The Power Management Unit (PMU) provides power management features that can be invoked through power management registers
or packet handling in the baseband core. This section contains descriptions of the PMU features.
Figure 8. Power Management Unit of CYW20719
RF Power Management
Figure 8 shows the CYBLE-413136-01 power management unit (PMU) block diagram that is contained in the CYW20719 silicon
device. The CYW20719 includes an integrated buck regulator, a bypass LDO, a capless LDO, and an additional 1.2 V LDO for RF.
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 HIDOFF (deep sleep) mode.
BBC Power Management
There are several low-power operations for the BBC:
n Physical layer packet handling turns RF on and off dynamically within packet TX and RX.
n Bluetooth-specified low-power connection mode. While in these low-power connection modes, the CYBLE-413136-01 runs on the
Low Power Oscillator and wakes up after a predefined time period.
The CYBLE-413136-01 automatically adjusts its power dissipation based on user activity. It supports the following power modes:
n Active mode
n Idle mode
n Sleep mode
n HIDOFF (deep sleep) mode
The CYBLE-413136-01 transitions to the next lower state after a programmable period of user inactivity. When user activity
resumes, the CYBLE-413136-01 immediately enters Active mode.
In HIDOFF mode, the CYBLE-413136-01 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 used for extended periods of inactivity.