151-0153 Rabbit Semiconductor, 151-0153 Datasheet - Page 140

• Manufacturer Part Number: 151-0153
• Description: ASSEMBLY - RABBITFLEX CABLES
• Manufacturer: Rabbit Semiconductor
• Series: RabbitFLEX™r

Specifications of 151-0153

• Accessory Type: Cable Assembly
• For Use With/related Products: BL300F
• Lead Free Status / RoHS Status: Vendor undefined / Vendor undefined

B.2 Battery-Backup Circuits
The data SRAM and the real-time clock on the PowerCore module have battery backup. Power to the
SRAM and the real-time clock (VRAM) is provided by two different sources, depending on whether the
PowerCore module is powered or not. When the PowerCore module is powered normally, and the +5 V
supply is within operating limits, the SRAM and the real-time clock are powered from the +5 V supply. If
power to the board is lost or falls below 4.38 V, the VRAM and real-time clock power will come from the
battery. The reset generator circuit controls the source of power by way of its /RESET output signal.
A replaceable 220 mA·h lithium battery provides power to the real-time clock and SRAM when external
power is removed from the circuit board. The drain on the battery is typically less than 6 µA when there is
no external power applied to the PowerCore module, and so the expected shelf life of the battery is:
Note that the shelf life of a lithium ion battery is ultimately 10 years. The PowerCore module does not
drain the battery while it is powered up normally.
B.2.1 Replacing the Backup Battery
The battery is user-replaceable, and is fitted in a battery holder. To replace the battery, slide out the old bat-
tery. Use only a 2032 or equivalent replacement lithium battery, and insert it into the battery holder with
the + side facing away from the PowerCore module.
B.3 Reset Generator
The core module uses a reset generator to reset the Rabbit 3000 microprocessor when the voltage drops
below the voltage necessary for reliable operation. The reset typically occurs at 4.38 V.
134
220 mA h
-------------------------- -
6 µA
NOTE: The SRAM contents and the real-time clock settings will be lost if the battery is
replaced with no power applied to the PowerCore module. Exercise care if you replace the
battery while external power is applied to the PowerCore module.
=
CAUTION: Be careful when replacing the battery with external AC power applied
to the PowerCore module. AC voltages up to 60 V may be present on locking con-
nector J3.
CAUTION: There is an explosion danger if the battery is short-circuited, recharged,
or replaced incorrectly. Replace the battery only with the same type or an equivalent
type recommended by the battery manufacturer. Dispose of used batteries according
to the battery manufacturer’s instructions.
4.2 years
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