Battery Backup For The Rcm5700/Rcm5710 And Rcm6700 Family - Rabbit MiniCore RCM5700 User Manual

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Distributor of Digi International: Excellent Integrated System Limited

Datasheet of 101-1274 - KIT DEV STANDARD RCM5700

G.1.1 Battery Backup for the RCM5700/RCM5710 and RCM6700 Family

The RCM5700/RCM6700 modules do not include a battery, but there is provision for customer-

supplied battery backup on some module types. Battery backup keeps the Rabbit 5000 real-time

clock running on the RCM5700/RCM5710 modules and keeps the Rabbit 6000 real-time clock

running while also preserving content of the internal 32 KB SRAM on the RCM6700 family of

modules. Battery backup is not available on the RCM5750/5760 modules.

The edge connector, shown in Figure G-1, allows access to the external battery. This makes it pos-

sible to connect an external 3 V power supply. This allows the internal Rabbit 5000/6000 real-

time clock to retain data with the RCM5700/RCM6700 powered down.

A lithium battery with a nominal voltage of 3 V and a minimum capacity of 165 mA·h is recom-

mended. A lithium battery is strongly recommended because of its nearly constant nominal volt-

age over most of its life.

The drain on the battery is typically 5uA for the RCM5700 and maximum 50uA for the

RCM6700 (R6K processor version marked "CC") when no other power is supplied.

MiniCore RCM5700/RCM6700 User's Manual

Figure G-1. External Battery Connections

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