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 |
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PVCCQ | Power from VCCQ Supply | — | 16 mW | 115 mW | |
Low Voltage Range (PXA210 and PXA250) |
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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 |
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PVCCN_L | Power from VCCN Supply, Low Range | — | 120 mW | 250 mW | |
@3.3V |
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PT_IDLE_L | Total Power, IDLE Mode, Low Range | — | 110mW | — | |
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Medium Voltage Range (PXA250 and PXA210) |
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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) | ||||
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PVCCN_MB | Power from VCCN Supply, Mid Range (PXA250 applications | — | 160 mW | 440 mW | |
@3.3V | processor) |
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PT_IDLE_M | Total Power, IDLE Mode, Medium Range | — | 110mW | — | |
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High Voltage Range (PXA250 applications processor only) |
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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 |
