SK-UPS25-1 RTD Embedded Technologies Uninterruptible Power Supply with Power Management & NiMH/NiCd Charger

The RTD Embedded Technologies UPS25 Uninterruptible Power Supply with Power Management & NiMH/NiCd Charger is a flexible PC/104 uninterruptible power supply subsystem that is designed to work together with the RTD EPWR104 and HPWR104 power supply utility modules to form a reliable power supply system. This scheme will allow main power interruption up to 30 minutes while still maintaining complete computer operation. The main 10 to 40V DC input is supplied to the UPS25 unit. While the supply is over 10V the UPS25 will charge the local short term backup NiMH/NiCd battery pack using one of the charging modes of the UPS25. These charge modes are automatically controlled by the on-board charger circuitry. The charging of the batteries can be controlled from your application software as well as the current UPS status and power states can be interrogated at any time. The power supply module receives power through the UPS25 and will operate either from the main supply or from the backup battery during main supply 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 UPS25 features a unique shutdown mode where your application software can disconnect the UPS battery after it is ready to shut down. After the UPS25 is put to sleep the backup battery is disconnected to save the backup battery from being unnecessarily discharged. The charging unit on the UPS25 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 +5 to +50C. NiMH batteries will provide backup in the temperature range of -5 to +70C while NiCd batteries will provide backup over the complete -40 to +70C range.