Omega Vehicle Security OMP-MODL manual MLAD-1 Module, RTC / Memory Backup Battery

2... OMP-MODL System Base

RTC / Memory Backup Battery

The OMP-MODL utilizes static ram for internal data storage which requires a constant power supply to maintain its memory. Similarly, the Real Time Clock (RTC) that keeps track of the date and time within the OMP-MODL runs continually whether the main power switch is ON or OFF.

When the main power is ON, the memory and RTC draw their power from the D-Cell batteries (or a connected external power supply). When the main power is switched OFF, power for memory and the RTC automatically switches to a small coin type lithium cell that is mounted on the main OMP- MODL circuit board (Figure 2... -7).

EXTERNAL POWER FUSE LITHIUM CELL

EPROM

BATTERY PIGTAIL & CONNECTOR

ML006

Figure 2... -7: Memory and RTC lithium battery location (bottom of MLCPU-1)

This cell will provide power for the RTC and memory for approximately one year. Any time that the OMP-MODL main power is ON extends this lifetime. At any time, the approximate state of charge of the lithium cell can be displayed on the LCD under the SYSTEM STATUS / SUPPLY VOLTAGES menu or from a serially connected PC running HyperWare and a Status Query command. For lithium cell replacement procedure, refer to Appendix D.

MLAD-1 MODULE

Overview

The MLAD-1 module contains the Analog to Digital converter, General Purpose Digital Input channel circuitry, Cold Junction Compensation circuitry, and four channels of analog input. This module plugs into the top of the MLCPU-1 module (or MLIM-5 if so equipped) and is required in all OMP-MODL systems.

Using the OMP-MODL 2-11