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Power saving

A technology of internal circuits and internal signals, used in data processing power supplies, electrical digital data processing, instruments, etc.

Inactive Publication Date: 2009-02-11
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Set pull-down and pull-up on the input of some devices to prevent floating, but in order to wake up the device through the D+USB input, the external host must pull down / up the D+ line for 100ms, which causes power in the device consumption while being overcome by an external device pull-up / pull-down

Method used

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Examples

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Embodiment Construction

[0011] Referring to FIG. 1, an exemplary embodiment of a USB cable disconnect and wake mode power saving circuit 10, as implemented in a microchip, is shown. Circuit 10 has two main parts: keeper stage 11 and output buffer stage 13 . The circuit 10 is powered from a power source 15 and ground 17 . The circuit has signals ENABLE 12 , DATA 14 , SLEEP 16 , PAD 18 , PAD input 20 and USB host 22 . (PAD simply refers to the signal line on the integrated circuit chip, which is connected to the integrated circuit package through thin bonding wires. In this case, the PAD can be connected to an external USB host.) The output buffer stage includes a buffer control circuit 24, which controls Output environment drivers 26 and 28 . The weak pull-up device 30 acts as a controllable weak pull-up, and the weak pull-down device 32 acts as a controllable weak pull-down. In integrated circuits, these can be implemented as square devices (transistors). "Weak" means that the keeper stage 11 pro...

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Abstract

The power saving method is achieved by holding the signal line weakly in its last time state, which is responded to and can be overcome by the state of the external signal. During sleep mode, the weakly maintained signal line states track and hold external signals using controllable weak pull-up or pull-down devices, so that weakly maintained states can be driven to different states by external drive signals with little power consumption consumption. When sleep mode is off, the keeper function is disabled and the signal line can be driven internally or externally depending on the state of the enable line.

Description

[0001] This application is a divisional application with the filing date of "July 11, 2002", the application number of "02814465.1", and the title of "Electric Energy Saving". technical field [0002] The Universal Serial Bus (USB) was designed to support asynchronous connection and disconnection between electronics and the USB host. A host is usually a computer. Connection and disconnection can be sensed by a computer or central processing unit (CPU) monitoring the 5 volts present on the shield of the incoming USB cable. Background technique [0003] One for monitoring USB connections (such as Intel SA110 Handset Microprocessor) is connected by connecting the USB cable to a general-purpose input / output (GPIO) with a weak pull-down. When the cable state changes (connected to disconnected, or vice versa), the GPIO changes state (low to high for connected and vice versa for disconnected). This state change can generate an interrupt to the controller and appropriate steps t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/32G06F3/00
CPCG06F1/3209G06F1/32
Inventor G·罗斯J·菲德勒Z·安萨努拉
Owner INTEL CORP