20-101-0492 Rabbit Semiconductor, 20-101-0492 Datasheet - Page 65
![MODULE OP6800 FULL-FEATURED](/photos/6/75/67579/20-101-0492_sml.jpg)
20-101-0492
Manufacturer Part Number
20-101-0492
Description
MODULE OP6800 FULL-FEATURED
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0492.pdf
(110 pages)
Specifications of 20-101-0492
Module/board Type
Single Board Computer Module
For Use With/related Products
OP6800
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
20-101-492
20-101-492
20-101-492
- Current page: 65 of 110
- Download datasheet (3Mb)
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
Related parts for 20-101-0492
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![20-101-0575](/photos/6/75/67539/20-101-0575_tmb.jpg)
Part Number:
Description:
COMPUTER SGL-BRD BL2500 29.4MHZ
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0576](/photos/37/60/376010/bl2500_600_tmb.jpg)
Part Number:
Description:
COMPUTER SGL-BRD BL2500 29.4MHZ
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0412](/photos/37/60/376043/101-0412_tmb.jpg)
Part Number:
Description:
DISPLAY GRAPHIC 12KEY PROG OP670
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0411](/photos/37/60/376043/101-0412_tmb.jpg)
Part Number:
Description:
DISPLAY GRAPHIC 12KEY ETH OP6700
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0457](/photos/37/60/376012/bl20_600_tmb.jpg)
Part Number:
Description:
COMPUTER SINGLE-BOARD BL2030
Manufacturer:
Rabbit Semiconductor
![20-101-0455](/photos/37/60/376012/bl20_600_tmb.jpg)
Part Number:
Description:
COMPUTER SGL-BOARD ETH BL2010
Manufacturer:
Rabbit Semiconductor
![20-101-0497](/photos/37/60/376011/op6800_rgb_tmb.jpg)
Part Number:
Description:
MODULE OP6810 W/O ETH/MEM EXPANS
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0456](/photos/37/60/376012/bl20_600_tmb.jpg)
Part Number:
Description:
COMPUTER SINGLE-BOARD BL2020
Manufacturer:
Rabbit Semiconductor
![20-101-0591](/photos/37/60/376012/bl20_600_tmb.jpg)
Part Number:
Description:
COMPUTER BL2010 W/FRICTION LOCK
Manufacturer:
Rabbit Semiconductor
![20-101-0594](/photos/37/60/376012/bl20_600_tmb.jpg)
Part Number:
Description:
COMPUTER BL2020 W/FRICTION LOCK
Manufacturer:
Rabbit Semiconductor
![20-101-0602](/photos/37/60/376010/bl2500_600_tmb.jpg)
Part Number:
Description:
COMPUTER SGL-BRD BL2500 44.2MHZ
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0430](/photos/37/60/376012/bl20_600_tmb.jpg)
Part Number:
Description:
COMPUTER SGL-BOARD FULL BL2000
Manufacturer:
Rabbit Semiconductor
![20-101-0462](/photos/37/60/376013/bl2100_600_tmb.jpg)
Part Number:
Description:
COMPUTER SINGLE-BOARD BL2110
Manufacturer:
Rabbit Semiconductor
![20-101-0891](/photos/37/60/376014/bl2600_600_tmb.jpg)
Part Number:
Description:
COMPUTER SGL-BRD 29.4MHZ BL2610
Manufacturer:
Rabbit Semiconductor
Datasheet:
![20-101-0654](/photos/37/60/376011/op6800_rgb_tmb.jpg)
Part Number:
Description:
INTERFACE OP6800 512K FLASH&SRAM
Manufacturer:
Rabbit Semiconductor
Datasheet: