REXROTH HDC01.1-A040N-IB01-01-FW Channel isolation card

If the voltage of the backup source is lower than two volts, the DS1210S blocks the second memory cycle; this allows software to provide an early warning to avoid data loss. Because the second access may be blocked during a power failure, software should do at least two accesses before relying on the data. The MVME162 provides jumpers (on J20) that allow either power source of the DS1210S to be connected to the VMEbus +5V STDBY pin or to one cell of the onboard battery. For example, the primary system backup source may be a battery connected to the VMEbus +5V STDBY pin and the secondary source may be the onboard battery. If the system source should fail or the board is removed from the chassis, the onboard battery takes over.

For proper operation of the onboard SRAM

 some jumper combination must be installed on the Backup Power Source Select Header. If one of the jumpers is used to select the battery, the battery must be installed on the MVME162. The SRAM may malfunction if inputs to the DS1210S are left unconnected. The SRAM is controlled by the MCchip, and the access time is programmable. Refer to the MCchip description in the MVME162 Embedded Controller Programmer’s Reference Guide for more detail.

About the Battery 

The power source for the onboard SRAM is a RAYOVAC FB1225 battery with two BR1225 type lithium cells, socketed for easy removal and replacement. A small capacitor is provided so that the batteries can be quickly replaced without data loss. The lifetime of the battery is very dependent on the ambient temperature of the board and the power-on duty cycle. The lithium battery supplied on the MVME162 should provide at least two years of backup time with the board powered off and with an ambient temperature of 40° C. If the power-on duty cycle is 50% (the board is powered on half of the time), the battery lifetime is four years. At lower ambient temperatures the backup time is significantly longer and may approach the shelf life of the battery.

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