20-101-0504 Rabbit Semiconductor, 20-101-0504 Datasheet - Page 167
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20-101-0504
Manufacturer Part Number
20-101-0504
Description
ACCY CABLE&MOUNTING HDWR SR9050
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0437.pdf
(184 pages)
Specifications of 20-101-0504
Accessory Type
Smart Star Cable
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
SR9500
Other names
101-0504
101-0504
101-504
101-504
101-0504
101-504
101-504
- Current page: 167 of 184
- Download datasheet (3Mb)
C.2.1 Replacing the Backup Battery
The battery is user-replaceable, and is fitted in a battery holder. To replace the battery, lift
up on the spring clip and slide out the old battery. Use only a Panasonic CR2330 or equiv-
alent replacement battery, and insert it into the battery holder with the + side facing up.
C.2.2 Battery-Backup Circuit
Figure C-1 shows the battery-backup circuit.
The battery-backup circuit serves three purposes:
• It reduces the battery voltage to the SRAM and to the real-time clock, thereby limiting
• It ensures that current can flow only out of the battery to prevent charging the battery.
• A voltage, VOSC, is supplied to U14, which keeps the 32.768 kHz oscillator working
VRAM and Vcc are nearly equal (<100 mV, typically 10 mV) when power is supplied to
the CPU Card.
User’s Manual
the current consumed by the real-time clock and lengthening the battery life.
when the voltage begins to drop.
NOTE: The SRAM contents and the real-time clock settings will be lost if the battery is
CAUTION: There is an explosion danger if the battery is short-circuited, recharged, or
replaced with no power applied to the Smart Star. There is a provision for an external bat-
tery if you need to save the SRAM contents and the real-time clock settings since the CPU
Card needs to be removed from the backplane in order to change the onboard battery.
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.
Figure C-1. Smart Star CPU Card Backup Battery Circuit
W
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thermistor
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167
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