CC2510FX Datasheet, PDF (140/253 Pages) List of Unclassifed Manufacturers – True System-on-Chip with Low Power RF Transceiver and 8051 MCU

CC2510Fx / CC2511Fx
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 CC2510Fx/CC2511Fx 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
on
• 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 a 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.
13.10.2 Power Management Control
The required power mode is selected by
the MODE bits in the SLEEP control
CC2510Fx/CC2511Fx PRELIMINARY Data Sheet (Rev. 1.2) SWRS055A Page 140 of
252