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HP 600LX series Palmtop PCs - Power Management

Introduction
This document describes the power sources for the HP 600LX series Palmtop PCs and offers suggestions for managing the power.
Power sources
The power supply system in the HP Palmtop PC is designed to accept three input power sources. The HP Palmtop PC also contains a built-in charging circuit to charge the Lithium Ion battery installed in the unit. The charging control algorithm is controlled by software.
The input sources are a rechargeable battery (Lithium Ion) installed in the unit, an external 12V AC input supply through the AC jack, and 1xLi CR2032 size battery installed in the unit to be used as a backup power source.
At any one time, only one of the input sources is used to power the system. They work in the following order:
  1. External power source
  2. Main power source
  3. Backup power source
This means that when the external power source is supplied to the system, the power supply from both the main and backup batteries will be cut off. In the absence of the external power source, the main battery will provide power to the system. If the main battery is either removed from the system or is weak, the backup battery will come into operation. However, the backup battery can only function to keep the system in suspend mode, and it does not allow you to operate the system.
AC adapter input supply
When the external 12V at 2.5V HP adapter is powering the system, all other internal input sources will be cut off.
Main battery (Lithium Ion rechargeable)
The main battery consists of a rechargeable Lithium Ion battery (click here to visit the accessories page for details and purchasing information). The main battery is designed so that it can only be inserted one way. Its nominal voltage is 7.2V at 1350mAh. The battery life is 3 hours. The life of the extended battery is 6 hours.
Charging
The charging current is 0.8A at constant voltage of 8.4V (regulation 1%). For a flat battery, the charging cycle starts with Constant Current Stage which lasts for about 1.5 to 2 hours (approximately 90% charge). Then, Constant Voltage Stage sets in, which lasts for 2 hours. Charging will take 3.5 to 4 hours for a completely flat battery. Charging will terminate 1 hour after the charge current reaches about 40mA for 100%.
For the extended battery, charging will take 4.5 to 5 hours for a completely flat battery.
Backup battery
The system uses one Lithium CR2032 battery for backup purposes. This backup battery will be used to maintain the system when the main battery is removed from the system or when the main battery is weak. The typical capacity of the backup battery is 3V 180mAh. The backup battery comes into operation when there is no ACIN signal and the NMI signal is active low (that is, when the main battery voltage reaches 4.5V). The backup battery low warning will appear when the backup battery reaches 2.90V; the backup battery very low warning will appear when it reaches 2.85V.
Low Battery
If the backup battery is low, the device may function abnormally. The abnormalities may be related to the display, calibration, settings, sound, or other features. For example, the image on the screen will blink on and off or mix colors on the screen and/or the stylus may frequently need to be calibrated. Often the abnormality will occur with more frequency as the battery loses more power.
Replacing the CR2032 backup battery
Replace the CR2032 backup battery (see Figure 1) and then press the little red button inside the backup battery compartment and hold for 5 seconds.
Figure : Replacing the backup battery
 note:
Before replacing the backup battery, the main battery should be charged or the device should be connected to AC power. Failure to do so could result in complete data loss on the device.
The backup battery should be replaced at least every 6 months: sooner if the device runs frequently on low battery power. A backup battery on low power may cause all of the abnormalities described above. If the main battery completely loses power or if the device is used when the main battery has little power, the backup battery can quickly lose power much more quickly than 6 months. Replacing the battery will protect the data on the device and resolve the issues listed above if caused by a low backup battery.
Voltage management
The AC adapter and Lithium Ion battery power source allows the unit to be in STANDBY, IDLE, or RUN modes. When the AC adapter and Lithium Ion battery power is not available, the Lithium coin cell battery allows the unit to operate in STANDBY mode only.
Critical shutdown is activated when the unit loses its power source (when battery voltage falls below NMI level). This shutdown mode protects stored data, but working data will be lost, because the unit will have to be reset after a critical shutdown. High power consumption devices will be shut down immediately (they include the backlight, display, and the PCMCIA). The system will be put into STANDBY mode in 200us. The system’s worst current consumption occurs when the system is accessing either the DRAM or the CompactFlash card while the PCMCIA is also being accessed.
Main Battery Low Warning
6.00V
Main Battery Very Low Warning [1]
5.50V
Main Battery NMI Voltage [2]
5.25V
Main Battery Cutoff
4.80V
Backup Battery kicks in [3]
4.50V
  1. At main battery very low warning, the system will issue the main battery very low warning message, and then go into STANDBY mode.
  2. At NMI, the system will go into critical shutdown within 200Ts.
  3. Backup battery will kick in to replace the main battery.
     note:
    In normal mode, the power supply to the PCMCIA Card is limited to 500mA.
    At the Main Battery Low state, you will have 15 minutes of use (normal typing in Word) before reaching Very Low Battery state; you should stop using the PCMCIA or CF card.
    When the battery level reaches Very Low Battery state, you should stop using any high power device that may cause the unit to enter critical suspense (NMI). All card operations should be stopped. No audio sound file should be played. The modem should be turned off immediately.

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