CC1110-RTR1 datasheet(130/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 130 of 202

13.10 Power Management

This

section

describes

the

Power

Management

Controller.

The

Power

Management Controller controls the use of

power modes and clock control to achieve

low-power operation.

13.10.1 Power Management Introduction

The

CC1110

uses different operating

modes, or power modes, to allow low-

power

operation.

Ultra-low-power

operation is obtained by turning off power

supply to modules to avoid static (leakage)

power consumption and also by using

clock gating to reduce dynamic power

consumption.

The

various

operating

modes

are

enumerated and shall be designated as

power modes (PMx). The power modes

are:

•

PM0

Clock oscillators on, voltage regulator

•

PM1

32.768/34 kHz oscillators on, voltage

regulator on

•

PM2

32.768/34 kHz oscillators on, voltage

regulator off

•

PM3

All

clock

oscillators

off,

voltage

regulator off

13.10.1.1 PM0

PM0 is the full functional mode of

operation where the CPU and peripherals

are active. The voltage regulator is turned

on.

PM0 is used for normal operation.

13.10.1.2 PM1

In PM1, the high-speed oscillators are

powered down thereby halting the CPU

and peripherals. The voltage regulator, the

power-on reset, external interrupts, the

32.768/34 kHz oscillators and sleep timer

peripherals are active. I/O pins retain the

I/O mode and output value set before

entering PM1. When PM1 is entered, a

power down sequence is run. When the

device is taken out of PM1 to PM0, the

high-speed oscillators are started. The

device will run on the high speed RC

oscillator until the high speed crystal

oscillator has settled and has been

selected.

PM1 is used when the expected time until

a wakeup event is relatively short since

PM1

uses

fast

power

down/up

sequence.

13.10.1.3 PM2

PM2 has the second lowest power

consumption. In PM2 the power-on reset,

external

interrupts,

32.768/34

kHz

oscillators and sleep timer peripherals are

active. I/O pins retain the I/O mode and

output value set before entering PM2. All

other internal circuits are powered down.

The voltage regulator is also turned off.

When PM2 is entered, a power down

sequence is run.

PM2 is used when it is relatively long until

the expected time of a wakeup event,

since the power up/down sequence is

relatively long. PM2 is typically entered

when using the sleep timer as the wakeup

event.

13.10.1.4 PM3

PM3 is used to achieve the operating

mode with the lowest power consumption.

In PM3 all internal circuits that are

powered from the voltage regulator are

turned off. The internal voltage regulator

and all oscillators are also turned off.

Power-on reset and external interrupts are

the only functions that are operating in this

mode. I/O pins retain the I/O mode and

output value set before entering PM3.

Only a reset or external interrupt condition

will wake the device up and place it into

PM0. The contents of RAM and registers

are preserved in this mode. PM3 uses the

same power down/up sequence as PM2.

PM3 is used to achieve ultra low power

consumption when waiting for an external

event.

CC1110-RTR1 데이터시트(PDF) 130 Page - Texas Instruments

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