Description:

VL82C323 SCAMP II, 5 Volt Power Management Unit (PMU)

The VL82C32A SCAMP Power Management Unit (PMU) is intended to be used in conjunction with the VL82C310 SCAMP 1 System Controller or VL82C316 SCAMP II 5 Volt Power Managed 386SX Controller and the VL82C107 SCAMP Combination I/O chip. The VL82C323 PMU dramatically reduces overall system power consumption and provides special features for laptop/notebook PC/AT-compatible computers. The power reduction is accomplished via an activity monitor which detects inactivity in the system, and reduces the CPU clock frequency and/or removes power form peripheral devices.

By monitoring the system activity, the VL82C323 switches between modes to achieve power saving without impacting system performance. The VL82C323 also provides an auto power-on feature to turn-on the system power via a push-button switch, modem ring indicator, or real-time clock time of day alarm.

The VL82C323 supports a suspend/resume function n conjunction with the BIOS to allow the user to turn the system power off and save the system information from the current application. when the system power is turned back on, the user is able to resume the application from the point where it was suspended.

Features:

• Supports X86-based PC/AT-compatible systems
• Provides system activity monitoring, peripheral control, power supply control, mode timers, and general purpose I/O for laptop/notebook power management
• Includes the logic to support X86 processors with the System Management Mode (SMM) feature
• Five operation modes:
  • On Mode
  • Doze Mode
  • Sleep Mode
  • Suspend Mode
  • Off Mode
• Independent programmable timers for power saving modes
• Independent programmable timers for LCD and backlight control
• Ten individual power control outputs:
  • Three for LCD power
  • Seven general purpose for peripherals
• Two to four low battery warning monitors
• Multiple power on sources from Suspend/Off Mode:
  • Push-Button
  • Real-time clock alarm
  • Modem ring
• AC power monitoring to disable PMU function
• Suspend Mode refresh options: none, CAS-before-RAS, Self-Refresh
• Leakage control of outputs during Suspend Mode
• Wide range of LCD panel power-up/-down sequencing
• Ten general purpose I/O ports; eight with additional I/O features:
  • One programmable blinking I/O
  • Two optional low battery inputs
• Watchdog timer to turn-off system power if low battery NMI is not serviced
• Programmable interrupt generation on:
  • PMU power mode
  • Low battery warning
  • External input
  • LCD panel timer
  • Reschedule Suspend Mode Interrupt by BIOS
  • Activity detection
• Generated interrupt selectable as IROx, NMI, or SMI
• Controls SCAMP I or SCAMP II (VL82C310 or VL82C316)
  • SLEEP pin
• Real-time clock alarm IRQ output pin for SCAMP 1 Controller
• 1.5-micron CMOS Technology
• 100-lead (thin) metric quad flat pack (MQFP)