RELIANCE 615055-1T Data acquisition card

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, carefully follow the precautions listed below in order to prevent accidents. 

❏ Do not short circuit. 

❏ Do not disassemble, deform, or apply excessive pressure. 

❏ Do not heat or incinerate. ❏ Do not apply solder directly. 

❏ Do not use different models, or new and old batteries together. 

❏ Do not charge. 

❏ Always check proper polarity.

To remove the battery from the module, carefully pull the battery from the socket. Before installing a new battery, ensure that the battery pins are clean. Note the battery polarity and press the battery into the socket. When the battery is in the socket, no soldering is required.

EPROM and Flash Memory 

The MVME172LX may be ordered with 2MB of Flash memory and two EPROM sockets ready for the installation of the EPROMs, which may be ordered separately. Flash memory is a single Intel 28F016SA device organized in a 2Mb x 8 configuration. The EPROM locations are standard JEDEC 32-pin DIP sockets that accommodate three jumper-selectable densities (256 Kb x 8; 512 Kb x 8; 1 Mb x8). A jumper setting (GPI4, pins 9-10 on J21), allows reset code to be fetched either from Flash memory (GPI4 installed) or from EPROMs (GPI4 removed).

Battery Backed Up RAM and Clock 

An M48T58 RAM and clock chip is used on the MVME172LX. This chip provides a time-of-day clock, oscillator, crystal, power fail detection, memory write protection, 8KB of RAM, and a battery in one 28-pin package. The clock provides seconds, minutes, hours, day, date, month, and year in BCD 24-hour format. Corrections for 28-, 29- (leap year), and 30-day months are automatically made. No interrupts are generated by the clock. Although the M48T58 is an 8-bit device, the interface provided by the MC2chip supports 8-, 16-, and 32-bit accesses to the M48T58. Refer to the MC2chip in the MVME172 VME Embedded Controller Programmer’s Reference Guide and to the M48T58 data sheet for detailed programming and battery life information.

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