Power, Reset, and Clock Management
8.1.4.3
Power Modes
The following is a high-level description of the different power modes of the device. They are listed in
order from highest power consumption, lowest wakeup latency (Standby), to lowest power consumption,
highest wakeup latency (RTC-only). If your application requires some sort of power management, you
must determine which power mode level described below satisfies your requirements. Each level must be
evaluated based on power consumed and latency (the time it takes to wakeup to Active mode). Specific
values are detailed in the device-specific data sheet. Note that not all modes are supported by software
packages supplied by Texas Instruments.
Table 8-13. Typical Power Modes
Power Modes
Application State
Power Domains, Clocks, and Voltage
Supply States
Active
All Features
Power supplies:
All power supplies are ON.
VDD_MPU = 1.1 V (nom)
VDD_CORE = 1.1 V (nom)
Clocks:
Main Oscillator (OSC0) = ON
All DPLLs are locked.
Power domains:
PD_PER = ON
PD_MPU = ON
PD_GFX = ON or OFF (depending on
use case)
PD_WKUP = ON
DDR is active.
Standby
DDR memory is in self-refresh and
Power supplies:
contents are preserved. Wakeup from any
All power supplies are ON.
GPIO. CortexA8 context/register contents
VDD_MPU = 0.95 V (nom)
are lost and must be saved before
entering standby. On exit, context must be
VDD_CORE = 0.95 V (nom)
restored from DDR. For wakeup, boot
Clocks:
ROM executes and branches to system
Main Oscillator (OSC0) = ON
resume.
All DPLLs are in bypass.
Power domains:
PD_PER = ON
PD_MPU = OFF
PD_GFX = OFF
PD_WKUP = ON
DDR is in self-refresh.
Deepsleep1
On-chip peripheral registers are
Power supplies:
preserved. Cortex-A8 context/registers are
All power supplies are ON.
lost, so the application needs to save
VDD_MPU = 0.95 V (nom)
them to the L3 OCMC RAM or DDR
before entering DeepSleep. DDR is in
VDD_CORE = 0.95 V (nom)
self-refresh. For wakeup, boot ROM
Clocks:
executes and branches to system resume.
Main Oscillator (OSC0) = OFF
All DPLLs are in bypass.
Power domains:
PD_PER = ON
PD_MPU = OFF
PD_GFX = OFF
PD_WKUP = ON
DDR is in self-refresh.
509
SPRUH73H – October 2011 – Revised April 2013
Power, Reset, and Clock Management (PRCM)
Copyright © 2011–2013, Texas Instruments Incorporated