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UR5HCFJL-FN Datasheet(PDF) 7 Page - Semtech Corporation |
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UR5HCFJL-FN Datasheet(HTML) 7 Page - Semtech Corporation |
7 / 20 page STATES OF OPERATION USING THE GREENCODERTM FOR SYSTEM MANAGEMENT TASKS Copyright Semtech, 1997-2001 DOC5-FJL-DS-106 www.semtech.com 7 The GreenCoderTM provides an ideal complement to low-power chip sets targeted to the portable and mobile computing market. The GreenCoderTM can be used to handle several system management tasks for small, portable system designs, thus saving space and additional components for the System Designer. Such system management tasks include those listed below. However, since most of the system management tasks are application and hardware-dependent, detailed implementation information is outside the scope of this document. For application examples and sample schematics, contact Semtech Technical Support. System shut-down/wake-up signal The GreenCoderTM can provide the system power management unit with a shut-down/wake-up signal which can be invoked either by a special keyboard combination or after a programmed period of user inactivity. Note: Self-Power ManagementTM is a feature protected under Semtech Corp. patent and copyright rights. Purchase of any version of the UR5HCFJL encoder conveys a license to utilize the Self-Power Management feature only through use of the UR5HCFJL in a PS/2-compatible keyboard subsystem. The GreenCoderTM has three states of operation, implemented to minimize the power consumption of the keyboard subsystem. The following diagram illustrates the three states of operation of the GreenCoderTM. Most of the time, the GreenCoderTM is in the Sleep State. Power consumption in this state is approximately 2 µA at 5 Volts of operation. The GreenCoderTM enters the Active State only when there is an event to process, such as a keystroke, a command from the system, or data from the external PS/2-compatible device. The GreenCoderTM enters and stays in the Stand-By State if an external device is connected to the auxiliary port or if one or more LEDs are turned on. In the Stand-By State, the IC consumes approximately 600 µA at 5 Volts. Transition from one state to the other does not require any input from the system. SLEEP STATE STAND BY STATE ACTIVE STATE Figure 2: States of Operation of UR5HCFJL |
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