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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.
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