arm开发板原理图(含PCB)

ECN CHANGES FROM REV 1 TO REV 2
1. Change C53 to 47pf
2. Reverse power and ground on U8
3. Make sure all jumpers are correctly called out on the schematics the way they are to
be connected on the board.
4. Remove signal SDOUT from JP12 and put signal SDIN in place.
5. Remove USB Maxim power switch and add fuse in place.
6. Correct alignment with GPIO headers.
7. Remove legend and put silkscreen at jumper location
8. Move headers for test0 and test1 over to allow for easier access. Also have test0 to outside
edge of board
9. remove bottom silkscreen
10. Add correct silk for RS232 com ports for Uart1 and Uart2
11. change LED2 to red
12. place DNP 1x2 header for alternative power source.
13. On pin 14 of audio dac remove net resetn and place egpio1 net in place. Place a 1K pull
down on the egpio1 line.
CHANGES FROM 9301 REV 2 TO 9302 BOARD PLATFORM
1. Change the part number of the 9301 to 9302
2. Change the following USB circuitry from Do not populate to populated: C109, C111, F1
C113, C115, C117, R125-128, J8