Deep-Idle Mode; Standby Mode; Sleep Mode; Deep-Sleep Mode - Intel PXA270 Optimization Manual

6.3.7.3

Deep-Idle Mode

Use deep-idle mode instead of idle mode whenever the time required without Intel XScale® core
operation is long enough to accomplish the necessary voltage and frequency changes.
6.3.7.4

Standby Mode

For lowest power consumption in standby mode:
•
Ensure VCC_Core and VCC_SRAM are 1.1V
•
Configure all possible I/O pins as outputs and drive them to a logic low
•
Drive TDI and TMS to a logic high
•
Drive the USB client differential inputs (USBCP and USBCN) to a logic high
6.3.7.5

Sleep Mode

For lowest power consumption in sleep mode:
•
Disable and ground VCC_SRAM, VCC_Core and VCC_PLL
•
Configure all possible IO pins as outputs and drive them to a logic low
•
Drive TDI and TMS to a logic high
•
Drive the USB client differential inputs (USBCP and USBCN) to a logic high
•
Enable the DC-DC converter, if possible
6.3.7.6

Deep-Sleep Mode

For lowest power consumption in deep-sleep mode:
•
Disable and ground all non-battery voltage supplies
•
Configure all possible I/O pins as outputs and drive them to a logic low
•
Drive TDI and TMS to a logic high
•
Drive the USB client differential inputs (USBCP and USBCN) to a logic high
•
Enable the DC-DC converter, if possible
Intel® PXA27x Processor Family Optimization Guide
Power Optimization
6-7