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An AS9100 and ISO 9001 Certified Company

PC/104 UPS with Power Management & NiMH/NiCd Charger

Operating Temperature -40° to +85°C

PC/104 Uninterruptible Power Supply
Rugged IDAN configuration available

Key Features

  • PC/104 Form Factor
  • Complete battery backup system for embedded computers
  • Wide input range 10-40 VDC
  • Charger current limited to 1.2A
  • Battery output voltage +9.6V nominal
  • Adjustable backup voltage trip level
  • Charger modes: Fast charge, Top off charge, and Trickle charge
  • Battery temperature and voltage condition monitoring
  • Two charger Status LEDs
  • Software controlled charger operation and diagnostics
  • Disconnects battery and power after shutdown
  • Fully PC/104 compliant


The UPS25ER is a flexible PC/104 uninterruptible power supply subsystem that is designed to work together with the RTD XPWR104 power supply Peripheral Module to form a reliable power supply system. This scheme will allow main power interruption up to 30 minutes at 20 Watts while still maintaining complete computer operation.

The main input is rated from 10 to 40V DC for the UPS25ER unit. While the supply is over 10V the UPS25ER will charge the local backup NiMH/NiCd battery pack using one of the available charging modes. These charge modes are automatically controlled by the onboard charger circuitry. The charging of the batteries can be enabled from your application software. Additionally, the software can interrogate the UPS status and power states at any time. The UPS25 routes power to your power supply module from either the main input or from the backup battery during main input power failure. An interrupt can be generated when the main power fails, and there is also a status bit that will indicate a soon-to-be discharged battery.

The UPS25ER features a unique shutdown mode where your application software can disconnect the UPS battery after it is ready to shut down. After the UPS25ER is put to sleep the backup battery is disconnected to save the backup battery from being unnecessarily discharged.

The charging unit on the UPS25ER ensures that maximum battery life is achieved. The onboard NiMH/NiCd charger accepts 8 batteries with a maximum capacity of 1500 mAh. The nominal full battery voltage is approximately 11.5V while a completely discharged battery pack will give 7.5V. Battery temperature is used to terminate the charge process as well as to protect the battery from being charged outside the recommended charge temperature range of 0 to +40C. NiMH batteries will provide backup in the temperature range of -10 to +65C while NiCd batteries will provide backup -20 to +65C range. The standard UPS25ER is delivered without a battery pack, but with a 10K thermistor allowing the construction of custom configured battery units. Starter kits are available with 1500 mAh NiMH or 1000 mAh NiCd battery pack equipped with a 10K NTC thermistor. Please contact the us for more details on available options.

Industry Applications

  • Mobile and Automotive Systems
  • Marine and Airborne Applications
  • Industrial Systems

Physical Attributes

  • Dimensions
    • Length (L): 3.775 inches (95.89 mm)
    • Width (W): 3.550 inches (90.17 mm)
    • Stand-off Height: 0.600 inches (15.24 mm)
  • Weight: Approximately 0.32 lbs. (0.14 Kg)
  • Standard Operating Temperature: -40 to +85°C, 90% humidity non-condensing (limited by battery technology)
  • Storage Temperature: -25 to +85°C (limited by battery technology)
    • NiMH Discharge Temperature: -10° to +65°C
    • NiMH Charge Temperature: 0° to +40°C
    • NiCd Discharge Temperature: -20° to +65°C
    • NiCd Charge Temperature: +10° to +40°C

Recommended Accessories

Documentation and Downloads

Ordering Information

Part Number Description Value


 NiMH Charger Peripheral Module



 UPS25ER-1 configured for use in IDAN frame



 NiCD Charger Peripheral Module



 UPS25ER-2 configured for use in IDAN frame



 NiMH Charger with 8 AA 1500 mAh cell pack



 NiCD Charger with 8 AA 1000 mAh cell pack



RTD Embedded Technologies, Inc.
Designed and Made in the USA
sales@rtd.com   |   +1-814-234-8087