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Chapter 4 - Memory Expansion Module Installation
4-15
Battery Connection
One battery will protect the contents of SRAM memory. A second battery
will provide additional security as on-board circuitry automatically selects
the battery with the highest voltage as the source for backup current. Exter-
nal batteries are connected at J4 (BAT1) and J5 (BAT2). Table 4-17 sum-
marizes the function of each pin in connectors J4 and J5. If SRAMs on the
module unit are to be made non-volatile with the batteries.
Table 4- 17. Backup Battery Connectors (J4 and J5)
Pin
Function
J4-1
J4-2
J4-3
J4-4
Backup Battery 1 (3.6 VDC)
Key (no connection
Backup Battery 1 (3.6 VDC)
Ground
J5-1
J5-2
J5-3
J5-4
Backup Battery 1 (3.6 VDC)
Key (no connection)
Backup Battery 1 (3.6 VDC)
Ground
Battery Replacement
To maintain backup current to the devices, a good battery must be connected
to J4 or J5 at all times. You can change one battery at a time. Figure 4-4
shows the J4 connector. (See Figure 4-1 for the location of the J5 connec-
tor). If only one battery is connected, remove the short from the unused
battery connector and connect a new battery. Then remove the old battery,
and short pins 3/4 of the connector or connect a second battery. If two good
batteries are connected, you can remove either, and the other will protect
memory contents as long as it has sufficient voltage.
Summary of Contents for XVME-976
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