HIP6501AEVAL1【PDF 1/10 页】EVALUATION BOARD ACPI HIP6501

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Power Management IC Simplifies ACPI

Implementation (HIP6501AEVAL1)

Application Note

August 1999

AN9846.2

Author: Bogdan M. Duduman

Introduction

The Advanced Configuration and Power Interface

specification (ACPI; [1]), written by a consortium

representing Intel, Microsoft and Toshiba, attempts to evolve

the current collection of power management methods and

configuration interfaces into a well-specified and unified

power management and configuration mechanism. The key

objective in the ACPI specification is to transfer all control of

power management and configuration functions to the

operating system, thus enabling Operating System Directed

Power Management (OSPM). ACPI-compliant systems will

benefit from a robust interface for configuring motherboard

devices, a versatile power management interface enabling a

wide variety of solutions with full operating-system support,

and not lastly, a realm of new, intelligent possibilities added

to the already broad span of PC uses.

The HIP6501A is the first Intersil IC to be used in conjunction

with a second chip to provide a complete ACPI-sanctioned

motherboard power regulation solution. The

HIP6501A/HIP6021 chip sets produce the processor core,

GTL bus, memory controller hub, and clock chip voltages, as

well as the SDRAM memory, 3.3V and 5V dual voltage

planes [2, 3] necessary for a complete PIII-Whitney system

implementation.

Quick Start Evaluation

IMPORTANT!

Given the specialized nature of the HIP6501A, the

HIP6501AEVAL1 board is meant to be evaluated only with

an ATX power supply. Furthermore, only an ACPI-ready ATX

supply can be used to power-up the evaluation board

(720mA capability on 5VSB output; ATX Specification v2.02,

[4]). Standard laboratory power supplies are not suitable for

powering up this evaluation board.

Circuit Setup

? Set up JP1 and JP2

Before connecting the input ATX supply to the

HIP6501AEVAL1 board, consult the data sheet and set the

JP1 and JP2 configuration jumpers according to the

configuration you wish to emulate. This configuration is

latched in at power-up, but can be subsequently changed

during active state operation (S0, S1) or during a chip

shutdown (while PB1 is being pressed). See HIP6501A data

sheet for information on all the available configurations and

how to set them [5].

? Connect the Input Power Supply

Ensuring that the supply is not plugged into the mains, or

that the AC switch is off (if provided), connect the main ATX

output connector to J1.

? Connect the Output Loads

Connect typical standby loads to all the evaluation board’s

outputs. Consult Table 1 for maximum loads supported by

the design of the HIP6501AEVAL1 in the configuration

received; consult the ‘HIP6501AEVAL1 Modifications’

chapter for information on modifying the evaluation board to

meet your special needs.

? Set Start-Up State (Active Is Recommended)

If start-up in active state is desired, ensure both ‘S3’ and ‘S5’

switches are in the off position (away from ‘S3’ or ‘S5’

marking). Ensure the ‘ATX ON’ switch is also in the off

position.

Set either the ‘S3’ or the ‘S5’ switch for start-up in either of

the standby states. IMPORTANT: only one switch needs to

be actuated, so select the standby state by turning on the

switch with that name - t he signal conditioning circuitry

ensures correct S3 and S5 pin stimulation.

Operation

? Provide Bias Voltage to the Board

Plug the ATX supply into the mains. If the supply has an AC

switch, turn it on. The ‘5VSB’ (LP4) LED should light up,

indicating the presence of 5V standby voltage on board.

? Examine Start-Up Waveforms

Sleep state start-up is immediate following application of

bias voltage. Using an oscilloscope or other laboratory

equipment, you may study the ramp-up and/or regulation of

the controlled voltages, according to the specific JP1, 2

configuration previously set and the specific standby state

selected.

For start-up into an active state (standby switches set off

prior to application of bias voltage), flip on the ‘ATX ON’

switch. This will turn on the main ATX outputs and the

HIP6501A will start up into active state. Once turned on,

SW1 needs not be turned off until bias is removed from the

board.

? Examine Output Quality Under Varying Loads

In either state (sleep or active) vary the output loads to

simulate computer loads typical of the specific operating

state the circuit is in.

1-888-INTERSIL or 321-724-7143

| Intersil (and design) is a trademark of Intersil Americas Inc.

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