101-0463 Rabbit Semiconductor, 101-0463 Datasheet - Page 82
101-0463
Manufacturer Part Number
101-0463
Description
COMPUTER SINGLE BOARD BL2120
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0464.pdf
(134 pages)
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
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B.2.3 Power to VRAM Switch
The VRAM switch on the BL2100 module, shown in Figure B-3, allows the battery
backup to provide power when the external power goes off. The switch provides an isola-
tion between Vcc and the battery when Vcc goes low. This prevents the Vcc line from
draining the battery.
W
W
W
Figure B-3. VRAM Switch
Field-effect transistor Q5 is needed to provide a very small voltage drop between Vcc and
VRAM (<100 mV, typically 10 mV) so that the board components powered by Vcc will
not have a significantly different voltage than VRAM.
When the BL2100 is not in reset, the
line will be high. This turns on Q2, causing
/RESET
its collector to go low. This turns on Q5, allowing VRAM to nearly equal Vcc.
When the BL2100 is in reset, the
/RESET
line will go low. This turns off Q2 and Q5, pro-
viding an isolation between Vcc and VRAM.
B.2.4 Reset Generator
The BL2100 module uses a reset generator on the module, U1, to reset the Rabbit 2000
microprocessor when the voltage drops below the voltage necessary for reliable operation.
The reset occurs between 4.50 V and 4.75 V, typically 4.63 V.
76
Smartcat (BL2100)
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