NRF51822-CFAB-R datasheet(25/130 Pages) NORDIC

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Page 25

nRF51822 Product Specification v3.3

3.4.2

Power management

The power management system is highly flexible with functional blocks such as the CPU, Radio Transceiver,

and peripherals having separate power state control in addition to the global System ON and OFF modes. In

System OFF mode, RAM can be retained and the device state can be changed to System ON through Reset,

GPIO DETECT signal, or LPCOMP ANADETECT signal. When in System ON mode, all functional blocks will

independently be in IDLE or RUN mode depending on needed functionality.

Power management features:

• Supervisor HW to manage

•Power on reset

•Brownout reset

• Power fail comparator

• System ON/OFF modes

• Pin wake-up from System OFF

•Reset

• GPIO DETECT signal

• LPCOMP ANADETECT signal

• Functional block RUN/IDLE modes

• RAM retention in System OFF mode (8 kB blocks)

• 16 kB versions will have 2 blocks

• 32 kB versions will have 4 blocks

3.4.2.1

System OFF mode

In system OFF mode the chip is in the deepest power saving mode. The system's core functionality is

powered down and all ongoing tasks are terminated. The only functionality that can be set up to be

responsive is the Pin wake-up mechanism.

One or more blocks of RAM can be retained while in System OFF mode.

NRF51822-CFAB-R Datenblatt(PDF) 25 Page - Nordic Semiconductor