User`s manual

MiniCore RCM5700/RCM6700 User’s Manual rabbit.com 105
G.1.1 Battery Backup for the RCM5700/RCM5710 and RCM6700 Family
The RCM5700/RCM6700 does not have a battery, but there is provision for a customer-supplied
battery to keep the internal Rabbit 5000/6000 real-time clock running on the
RCM5700/RCM5710 and 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.
Figure G-1. External Battery Connections
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 120uA for the RCM6700 when no
other power is supplied.