Eurotech Appliances PXA270 Wake-upsources, typ, typ, typ, Frequency, frequency, System bus, Idle power, Conditions, consumption, consumption, Active power, PXA270 low power modes

ZEUS Technical Manual	Power and power management

	System bus	Active power	Idle power	Conditions
	System bus	consumption	consumption	VCC_MEM, VCC_BB,
Frequency	frequency	typ.	typ.	VCC_SRAM = 1.1V; VCC_PLL = 1.3V;
Frequency	frequency	typ.	typ.	VCC_USIM, VCC_LCD = 1.8V;
				VCC_IO, VCC_BATT,VCC_USB=3.0V
520MHz	208MHz	747 mW	222 mW	VCC_CORE = 1.45V
416MHz	208MHz	570 mW	186 mW	VCC_CORE = 1.35V
312MHz	208MHz	390 mW	154 mW	VCC_CORE = 1.25V
312MHz	104MHz	375 mW	109 mW	VCC_CORE = 1.1V
208MHz	208MHz	279 mW	129 mW	VCC_CORE = 1.15V
104MHz	104MHz	116 mW	64 mW	VCC_CORE = 0.9V
13MHz	CCCR[CPDIS]=1	44.2 mW	-	VCC_CORE = 0.85V

PXA270 low power modes		Power consumption Conditions
PXA270 low power modes		typ.	VCC_MEM, VCC_BB, VCC_USIM, VCC_LCD = 1.8V
			VCC_IO, VCC_BATT, VCC_USB= 3.0V
13MHz idle mode (LCD on)		15.4mW	VCC_CORE, VCC_SRAM, VCC_PLL = 0.85V
13MHz idle mode (LCD off)		8.5mW	VCC_CORE, VCC_SRAM, VCC_PLL = 0.85V
Deep sleep mode		0.1mW	VCC_CORE, VCC_SRAM, VCC_PLL = 0V
Sleep mode		0.16mW	VCC_CORE, VCC_SRAM, VCC_PLL = 0V
Standby mode		1.7mW	VCC_CORE, VCC_SRAM, VCC_PLL = 3.0V

Wake-up sources

The PXA270 offers two sleep modes:

•Sleep mode offers lower power consumption by switching off most internal units. There is no activity inside the processor, except for the units programmed to retain their state in the PSLR register, the real time clock and the clocks and power manager. Because internal activity has stopped, recovery from sleep mode must occur through an external or internal real time clock event. External wake-up sources are GPIO<n> edge detects (they are listed in the section PXA270 GPIO pin assignments, page 22).

•Deep-sleep mode offers the lowest power consumption by powering most units off. There is no activity inside the processor, except for the real time clock (RTC) and the clocks and power manager. Because internal activity has stopped, recovery from deep-sleep mode must be through an external event or an RTC event. In deep-sleep mode, all the PXA270 power supplies (VCC_CORE, VCC_SRAM, VCC_PLL, VCC_IO excluding VCC_BATT) are powered off for minimized power consumption. On the ZEUS, the main +3.3V rail supplies the VCC_IO power domain of the PXA270. Since the +3.3V supply is switched off in deep-sleep mode, all the on- board peripherals are powered off and it is not possible to use external wake-up sources. In this situation, recovery from deep-sleep mode must be through an internal RTC event.

For more information on PXA270 power management, see section 3.6 in the Intel PXA27x Processor Family Developer’s Manual, included on the Development Kit CD.