20-101-0654 Rabbit Semiconductor, 20-101-0654 Datasheet - Page 65
20-101-0654
Manufacturer Part Number
20-101-0654
Description
INTERFACE OP6800 512K FLASH&SRAM
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0492.pdf
(110 pages)
Specifications of 20-101-0654
Module/board Type
Single Board Computer Module
Product
Modules
Processor Type
Rabbit 2000
Sram
128 KB
Flash
256 KB
Timers
8 bit, 10 bit
Backup Battery
Lithium Battery
Operating Voltage
9 V to 36 V
Power Consumption
1.5 W
Board Size
111 mm x 91 mm x 33 mm
Description/function
Computer Module
For Use With/related Products
OP6800
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
20-101-654
20-101-654
20-101-654
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B.2.2 Power to VRAM Switch
The VRAM switch on the OP6800 module, shown in Figure B-1, 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-1. 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 OP6800 is not in reset, the
/RESET
line will be high. This turns on Q2, causing
its collector to go low. This turns on Q5, allowing VRAM to nearly equal Vcc.
When the OP6800 is in reset, the
line will go low. This turns off Q2 and Q5, pro-
/RESET
viding an isolation between Vcc and VRAM.
B.2.3 Reset Generator
The OP6800 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.
User’s Manual
61
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