Intel PXA27X Supply Current For Each Power Domain, Intel PXA27x Processor VCCCORE Supply Current

Intel® PXA27x Processor Family Power Requirements

Note: The figures in Table 4 where taken from a system with no enhanced power management optimization such as Intel Wireless Speedstep (which allows control over the PXA27x processors low power modes and dynamically selectable frequency and voltage change capability).

Table 4. Intel® PXA27x Processor VCC_CORE Supply Current

Frequency	Dhrystones 2.1	Power	MPEG4 Decode	Power	Power Stress	Power
Point @					Test
	Current (mA)	(mW)	current (mA)	(mW)		(mW)
voltage V					Current (mA)
624 MHz	658	1019	622	964	1006	1559
1.55 V
520 Mhz	503	729	475	689	767	1112
1.45V
416 MHz	395	533	420	567	594	802
1.35V
312 MHz	297	371	333	416	436	545
1.25V
208 MHz	208	239	263	303	295	339
1.15V
NOTE: Core Frequency shown above/Internal bus = 208MHz/Memclk = 208MHz/SDCLK = 104MHz

Note: Use these specifications as a guideline for power supply capacity. These typical guidelines will vary across different platforms and software applications.

2.1.3.2Supply Current For Each Power Domain

This section provides guidelines for the power consumption that could be seen for each power supply domain when running a heavily loaded system. Focused workloads were used to exercise each power supply domain separately. It is important to note that the workloads were designed to push the power consumption on each domain to a higher than normal level given a typical environment in order to show what the overall power envelope for these domains could look like. In a real system, each domain will see varying amounts of power consumption based on the type of workload run. For instance, an MPEG-4 decoder is going to utilize the memory controller much more than performing simple email transactions would.

Guidance on the power consumption for each domain in order to show Table 5 lists power-supply current for each PXA27x processor power domain except for VCC_CORE (Table 4 shows data for VCC_CORE). The environment test conditions are at room temperature and the voltage levels are specified below.

Note that the I/O domain regulator(s) (VCC_IO, VCC_LCD, VCC_MEM, VCC_BB,

VCC_USIM, VCC_USB) have additional loading from external devices attached to the PXA27x processor. For example, when flash memory or SDRAM is connected to the system bus. These loads must be added to those of PXA27x processor I/Os (if they are powered by the same regulator) when specifying the total load to be provided by a given regulator.

12 Application Note