ABB HAC319AEV1 HIEE300771R1 Logic controller

The SRAM allows the debugger to operate and limited diagnostics to be executed without the DRAM mezzanine. The SRAM will not support burst cycles. The SRAM is controlled by the VMEchip2, and the access time is programmable. Refer to the VMEchip2 in the Single Board Computers Programmer's Reference Guide for more detail. The boards are populated with 100 ns SRAMs. SRAM battery backup is optionally available on the MVME177. The battery backup function is provided by a Dallas DS1210S. Only one backup power source is supported on the MVME177. The battery supplies VCC to the SRAMs when main power is removed. Each time the MVME177 is powered up, the DS1210S checks the power source. If the voltage of the backup source is less than two volts, the second memory cycle is blocked. This allows software to provide an early warning to avoid data loss. Because the DS1210S may block the second access, the software should do at least two accesses before relying on the data.

Optionally, the MVME177 provides jumpers

 that allow the power source of the DS1210S to connect to the VMEbus +5 V STDBY pin or the onboard battery. The optional power source for the SRAM is a socketed Sanyo CR2430 battery. A small capacitor is provided to allow the battery to 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 FB1225 and CR2430 lithium batteries should provide at least two years of backup time with the board powered off and the board at 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 greatly extended and may approach the shelf life of the battery.

When a board is stored

 if the battery is present, it should be disconnected to prolong battery life. This is especially important at high ambient temperatures. MVME177 boards with battery backup are shipped with the batteries disconnected. The power leads from the battery are exposed on the solder side of the board, therefore the board should not be placed on a conductive surface or stored in a conductive bag unless the battery is removed. Note Lithium batteries incorporate inflammable materials such as lithium and organic solvents. If lithium batteries are mistreated or handled incorrectly, they may burst open and ignite, possibly resulting in injury and/or fire. When dealing with lithium batteries

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