參數(shù)資料
型號(hào)： 20-101-0497
廠商： Rabbit Semiconductor
文件頁(yè)數(shù)： 73/110頁(yè)
文件大小： 0K
描述： MODULE OP6810 W/O ETH/MEM EXPANS
標(biāo)準(zhǔn)包裝： 1
系列： SBC
模塊/板類型： 單板計(jì)算機(jī)模塊
適用于相關(guān)產(chǎn)品： OP6810
其它名稱： 20-101-497
20-101-497-ND
User’s Manual
61
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.
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 /RESET line will go low. This turns off Q2 and Q5, pro-
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.
FDV302P
Q5
R33
R17
R30
VRAM
VCC
Q2
MMBT3904
22 kW
0 W
/RESET
10 kW
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201-01050 功能描述:鋁質(zhì)電解電容器 - 帶引線 1 uF Electrolytic Capacitor RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長(zhǎng)度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk
201-0105-01 功能描述:印刷電路板和試驗(yàn)板 JTAG 20 Pin Connector RoHS:否 制造商:3M Electronic Solutions Division 產(chǎn)品:Jumper & Insulated Wires 描述/功能:Jumper wire, 22 AWG 0.1 inch 長(zhǎng)度:0.1 in 寬度:
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