Philips ISP1561 Speaker User Manual


 
Philips Semiconductors ISP1561 Evaluation Board User’s Guide
UM10005_3 © Koninklijke Philips Electronics N.V. 2003. All rights reserved.
User’s Guide Rev. 2.0—April 2003 4 of 20
1. Introduction
The ISP1561 evaluation board is a standard implementation of the ISP1561 in a complete configuration that allows
you to exercise all signals and main features. Figure 1-1 shows the ISP1561 evaluation board.
Some of the features that are implemented in the ISP1561 evaluation board are as follows:
Selection between PCI V
AUX
and PCI V
CC
power supply, with voltage presence indicator. This feature in
combination with the auxiliary +5 V input on J1 allows testing the system wake-up from power
management states, such as S3cold, in which PCI V
CC
is not present. This is intended mainly for testing the
ISP1561 in motherboard or notebook designs.
Selection between 12 MHz clock (from a crystal) or 48 MHz clock (from a 48 MHz oscillator) input. By
default, 12 MHz crystal is implemented.
Simple and reliable overcurrent protection scheme that allows testing of the
OCn
and
PWEn
signals.
Alternative solutions (resettable circuit protection devices) can be adopted.
Port power and GoodLink™ LEDs. These may be omitted in a standard commercial implementation but
are considered useful on the evaluation board for easier understanding of functionality and debugging.
Connector for testing legacy signals in the case of an on-board solution design. Testing the legacy feature
requires a motherboard with BIOS support for USB or legacy implementation on OHCI.
Input for an external power supply (J1). This allows complete testing of power management on a standard
mainboard, including the power management modes in which the PCI +5 V is cut off.
Figure 1-1: ISP1561 Evaluation Board