101-0463 Rabbit Semiconductor, 101-0463 Datasheet - Page 80

• Manufacturer Part Number: 101-0463
• Description: COMPUTER SINGLE BOARD BL2120
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0463

• Module/board Type: Single Board Computer Module
• For Use With/related Products: BL2120
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

B.2 Batteries and External Battery Connections
The SRAM and the real-time clock have battery backup. Power to the SRAM and the real-
time clock (VRAM) is provided by two different sources, depending on whether the main
part of the BL2100 is powered or not. When the BL2100 is powered normally, and Vcc is
within operating limits, the SRAM and the real-time clock are powered from Vcc. If power
to the board is lost or falls below 4.63 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
A replaceable 265 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 10 µA when there is no external power applied to the BL2100, and so the expected
shelf life of the battery is
The drain on the battery is typically less than 4 µA when external power is applied, and so
the expected BL2100 battery in-service life is
A long-life 950 mA·h solder-in battery is also provided for in the board layout.
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output signal.
265 mA·h
----------------------- -
265 mA·h
----------------------- -
10 µA
4 µA
=
=
3.0 years.
7.5 years.
Smartcat (BL2100)