Power and Clocking

Since few systems operate at maximum loading, performance, and voltage, a more optimal system design requires more typical power consumption parameters. These parameters are important when considering battery size and optimizing regulator efficiency. Typical systems operate with fewer modules active and at nominal voltage and load. Typical power consumption for the applications processor is calculated using these conditions:

SSP, STUART, USB, PWM, Timer, I2S peripherals operating

LCD enabled with 320x240x16bit color

MMC, AC97, BTUART, FFUART, ICP, I2C peripherals disabled

I/O loads at nominal (35pf for all pins)

Core operating at 98% Instruction Hit Rate, 95% Data Hit Rate

All voltages at nominal value

The individual power supply specifications add up to more than the total because the operating conditions which cause maximum power consumption on each supply are sometimes mutually exclusive.

Table 8-3. Power Consumption Specifications (Sheet 1 of 2)

Symbol

Description

Min1

Typical1

Max1

Package, Frequency, and Voltage Range Independent Power Supplies

 

 

 

 

 

 

 

 

PVCCQ

Power from VCCQ Supply

16 mW

115 mW

Low Voltage Range (PXA210 and PXA250)

 

 

 

 

 

 

 

 

PT_L

Total Power, Low Range

250 mW

550 mW

PVCC_L

Power from VCC Supply, Low Range

110 mW

65 mW

PVCCN_L

Power from VCCN Supply, Low Range

65 mW

145 mW

@2.5V

 

 

 

 

 

 

 

 

 

PVCCN_L

Power from VCCN Supply, Low Range

120 mW

250 mW

@3.3V

 

 

 

 

 

 

 

 

 

PT_IDLE_L

Total Power, IDLE Mode, Low Range

110mW

 

 

 

 

 

Medium Voltage Range (PXA250 and PXA210)

 

 

 

 

 

 

 

 

PT_MM

Total Power, Mid Range (PXA210 applications processor)

350 mW

690 mW

PT_MB

Total Power, Mid Range (PXA250 applications processor)

420 mW

840 mW

PVCC_M

Power from VCC Supply, Mid Range

180 mW

130 mW

PVCCN_MM

Power from VCCN Supply, Mid Range (PXA210 applications

160 mW

325 mW

processor)

PVCCN_MB

Power from VCCN Supply, Mid Range (PXA250 applications

100 mW

250 mW

@2.5V

processor)

 

 

 

 

 

 

 

 

PVCCN_MB

Power from VCCN Supply, Mid Range (PXA250 applications

160 mW

440 mW

@3.3V

processor)

 

 

 

 

 

 

 

 

PT_IDLE_M

Total Power, IDLE Mode, Medium Range

110mW

 

 

 

 

 

High Voltage Range (PXA250 applications processor only)

 

 

 

 

 

 

 

 

PT_HB

Total Power, High Range (PXA250 applications processor)

450 mW

890 mW

PVCC_H

Power from VCC Supply, High Range

275 mW

220 mW

PXA250 and PXA210 Applications Processors Design Guide

8-3

Page 71
Image 71
Intel PXA250 and PXA210 Power Consumption Specifications Sheet 1, Symbol Description Min1 Typical1 Max1, Ptidlel, Ptidlem

PXA250 and PXA210 specifications

The Intel PXA250 and PXA210 processors, part of the Intel XScale architecture, were introduced in the early 2000s, targeting mobile and embedded applications. They are known for their low power consumption, high performance, and advanced multimedia capabilities, making them suitable for a wide range of devices, including PDAs, smartphones, and other portable computing devices.

The PXA250, which operates at clock speeds ranging from 400 MHz to 624 MHz, features a superscalar architecture that allows it to issue multiple instructions per clock cycle. This enhances the overall performance for demanding applications while maintaining low power usage. It supports a variety of peripheral interfaces, including USB, Ethernet, and various memory types, which contributes to its versatility in different product designs.

One of the key technologies in the PXA250 is the integrated Intel Smart Repeat Technology, which optimizes data processing, thereby reducing the amount of power consumed during operation. This feature is particularly important for battery-powered devices, as it extends the overall battery life, allowing for longer usage times in mobile environments. Additionally, the PXA250 includes a dedicated graphics acceleration unit, which enables enhanced graphics and multimedia performance suited to modern applications at the time.

In contrast, the PXA210 is a more entry-level processor, aimed at cost-sensitive applications. Operating at lower clock speeds, typically around 200 MHz to 400 MHz, it forgoes some of the advanced performance features of the PXA250 while still offering a good balance of performance and power efficiency. The PXA210 is less complex, making it suitable for simpler devices that do not require the extensive capabilities of the PXA250.

Both processors utilize the Intel XScale architecture, which is based on the ARM instruction set. They are built on a 0.13-micron process technology, enabling higher density and lower power consumption compared to their predecessors. With integrated memory controllers and bus interfaces, they facilitate efficient data handling and connectivity options.

In summary, both the Intel PXA250 and PXA210 processors played a crucial role in the evolution of mobile computing by providing powerful processing capabilities with energy efficiency. Their features and technologies enabled device manufacturers to create innovative products that catered to the growing demand for portable devices during that era.