OP7100
114
Backup Battery
Battery Life and Storage Conditions
The battery on the OP7100 will provide approximately 9,000 hours of
backup time for the onboard real-time clock and static RAM. However,
backup time longevity is affected by many factors including the amount of
time the OP7100 is unpowered. Most systems are operated on a continuous
basis, with the battery supplying power to the real-time clock and the
SRAM during power outages and/or during routine maintenance. The time
estimate reflects the shelf life of a lithium battery with occasional use
rather than the ability of the battery to power the circuitry full time.
The battery has a capacity of 265 mA·h. At 25°C, the real-time clock
draws 3 µA when idle, and the 128K SRAM draws 4 µA. If the OP7100
were unpowered 100 percent of the time, the battery would last 32, 000
hours (3.6 years).
To maximize the battery life, the OP7100 should be stored at room
temperature in the factory packaging until field installation. Take care that
the OP7100 is not exposed to extreme temperature, humidity, and/or
contaminants such as dust and chemicals.
To ensure maximum battery shelf life, follow proper storage procedures.
Replacement batteries should be kept sealed in the factory packaging at
room temperature until installation. Protection against environmental
extremes will help maximize battery life.
Replacing the Lithium Battery
The battery is user-replaceable, and is fitted in a battery holder. To replace
the battery,
lift up on the spring clip and slide out the old battery. Use only
a Panasonic CR2330 or equivalent replacement battery, and insert it into
the battery holder with the + side facing up.
Note that the SRAM contents and the real-time clock settings
will be lost if the battery is replaced with no power applied to
the OP7100. Therefore, if you do replace the battery with
external power applied to the OP7100, exercise caution since
high voltages are present in the vicinity of T1 on the side of the
printed circuit board opposite to the battery holder.
Summary of Contents for OP7100
Page 1: ...OP7100 Serial Graphic Display User s Manual 019 0065 070831 O ...
Page 10: ...OP7100 x About This Manual ...
Page 16: ...OP7100 16 Overview ...
Page 74: ...OP7100 74 Software ...
Page 82: ...OP7100 82 Graphics Programming ...
Page 88: ...OP7100 88 Installation ...
Page 98: ...OP7100 98 Specifications ...
Page 108: ...OP7100 108 Memory I O Map and Interrupt Vectors ...
Page 112: ...112 Serial Interface Board 2 OP7100 ...
Page 113: ...OP7100 Backup Battery 113 APPENDIX E BACKUP BATTERY ...
Page 116: ...OP7100 116 Backup Battery ...
Page 124: ...OP7100 124 Index ...
Page 126: ...XX0000 Schematics ...