37 lines
1.6 KiB
Plaintext
37 lines
1.6 KiB
Plaintext
Version 4
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SHEET 1 1388 680
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WIRE 192 0 -48 0
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WIRE 192 64 192 0
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WIRE -48 176 -48 0
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WIRE 192 208 192 144
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WIRE 288 208 192 208
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WIRE 400 208 368 208
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WIRE 192 288 192 208
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WIRE -48 368 -48 256
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WIRE 192 368 192 352
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WIRE 192 368 -48 368
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WIRE 192 400 192 368
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FLAG 192 400 0
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FLAG 400 208 #RESET
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IOPIN 400 208 In
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SYMBOL res 176 48 R0
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SYMATTR InstName R1
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SYMATTR Value 100
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SYMBOL cap 176 288 R0
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SYMATTR InstName C1
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SYMATTR Value 10µ
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SYMBOL res 384 192 R90
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WINDOW 0 0 56 VBottom 2
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WINDOW 3 32 56 VTop 2
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SYMATTR InstName R2
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SYMATTR Value 1k
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SYMBOL voltage -48 160 R0
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WINDOW 123 0 0 Left 0
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WINDOW 39 0 0 Left 0
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SYMATTR InstName V1
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SYMATTR Value 5
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TEXT -1112 224 Left 2 ;Constraints:\nVoltage source that MCP2515 accepts is 5 V.\nThe minimum operating voltage is 2.7 V.\nTo ensure this happens with a comfortable margin, we will design #RESET\nto remain below 2.7 V for at least 10 microseconds.
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TEXT -1112 -40 Left 2 ;Problem:\n(Taken from MCP2515 Datasheet [Page 57])\nIt is important to provide a RESET signal after power-up to ensure that the logic\nand registers are in their default state. A hardware Reset can be achieved\nautomatically by placing an RC on the #RESET pin (See Figure 9-1).\nThe values must be such that the device is held in Reset for a minimum of\n2 microseconds after V_DD reaches the operating voltage, as indicated\nin the electrical specification (t_RL).
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TEXT -1112 424 Left 2 !.tran 0 0.001 0 startup
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TEXT 424 0 Left 2 ;Result:\nThis way over-satisfies the requirements, but will stay with this since the parts are\nprobably cheapest, just lying around somewhere in these values.
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