Power System Overview; Power Domains - Texas Instruments OMAP5912 Reference Manual

2

Power System Overview

2.1

Power Domains

SPRU753A
This section provides guidelines for optimizing and reducing the overall device
power dissipation.
For a global perspective, see Chapter 4, Clocks, and Chapter 5, Initialization.
Power consumption has two components:
-
Dynamic power consumption
-
Static power consumption because of leakage currents
To minimize dynamic power consumption, one of the following must be done:
-
Minimize the activity in the circuit by enabling the automatic clock gating
or by switching off some unused resources (MGS3/DSP or other module)
-
Adjust the clock frequency on each clock domain according to the required
MIPS or required bandwidth
-
Minimize the external voltage supply (dynamic voltage scaling) if the
application does not require the maximum clock frequencies
To minimize the static power consumption or leakage currents when the circuit
is in stand-by mode, minimize the external voltage supply once the circuit is
in deep sleep mode.
The OMAP5912 architecture implements hardware features so that various
power management strategies can be enacted.
Table 40 lists all OMAP5912 power supplies with their respective nominal
value and power domains.
Figure 19 shows how those power domains are connected or can be isolated
from one another.
Power System Overview
Power Management 67