CC2430-RTR1-F64Z datasheet(140/234 Pages) TI

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CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 140 of 232

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

CC2430

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 are be designated as

power modes (PMx). The power modes

are:

•

PM0

Clock oscillators on, voltage regulator

•

PM1

32.768 kHz oscillators on, voltage

regulator on

•

PM2

32.768 kHz oscillators on, voltage

regulator off

•

PM3

All

clock

oscillators

off,

voltage

regulator off

Note: the voltage regulator above refers to

the digital regulator. The analog voltage

regulator must be disabled separately

through the RF register RFPWR.

13.10.1.1 PM0

PM0 is the full functional mode of

operation where the CPU, peripherals and

RF transceiver 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. The voltage regulator and

the 32.768 kHz oscillators are on. 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

XOSC has settled and 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 kHz oscillator

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 for 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 I/O port

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.

13.10.2 Power Management Control

The required power mode is selected by

the MODE bits in the SLEEP control

Setting

the

SFR

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