Description:

VL82C312 SCAMP Power Management Unit (PMU)

The SCAMP Power Management Unit (PMU) chip is intended to be used in conjunction with the VL82C310 SCAMP-LT chip and the VL82C107 SCAMP Combination chip. The PMU dramatically reduces overall system power consumption and provides special features for laptop/notebook PC/AT-compatible computers.

Features:

• Provides system activity monitoring, peripheral control, power supply control, mode timers, and general purpose I/O for laptop/notebook power management
• 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
• Four "low battery" warning monitors: two standard and two optional
• Multiple power-on sources from Suspend/Off Mode:
  • Pushbutton
  • RTC alarm
  • Modem ring
• AC power monitoring to disable PMU function
• Refresh support in suspend Mode
• 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
  • three inputs AND/OR selectable I/O with one common GPIO output
• Watchdog timer to turn off system power if low battery NMI is not serviced
• Programmable NMI generation on:
  • PMU power mode
  • Low battery warning
  • External input
  • LCD panel timer
  • Reschedule Suspend Mode NMI by BIOS
• Controls SCAMP's SLEEP pin
• RTC alarm IRQ output pin for SCAMP
• Additional logic included to minimize system board component count
• Provides chip selects for:
  • IDE interface
  • Floppy disk controller
  • VL16C452 serial/parallel I/O chip
• Provides multiplexed address/data bus for VGA controller
• Chip ID and revision register
• 144-pin MQFP low-power CMOS IC