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OLIMEX© 2015
8.2 Board revision
Remember to check the schematics and the board design files to compare the differences.
Revision
B
C
D
E
F
G
Notable changes
Initial release of the board
1. Resistor matrix RM23 gets replaced by: R133,R134,R135
2. Adjusted the package of H5TQ2G63BFR/MEM4G16D3EABG-125
3. R12 and R15 values changed to 0R
4. NAND_E jumper is changed from PTH to SMD closed
5. 5V_SATA_PWR connector (altogether with 2×2uF) is changed
from WF2S to DW02S and placed near the PWR jack instead of
original position
6. GPIO-4 is now correctly named GPIO-1
7. There is a signal for the power of of the SATA – PB8/SATA-
PWR-EN (r136, c216, r138, t1, t137, fet4)
8. A jumper between 5V_E_SATA and 5V_PWR_SATA is added
9. The micro SD card connector is changed
Resistor optimizations
1. Adjusted and optimized the position of PCB names
2. R16 changed from 237R to 330R, for stability purposes
3. R7, R9 also changed from 237R to 330R, for stability
purposes
4. R41 and R104 changed from 1k/1% to 390R for better sync
signal and to improve the VGA signal (allowing it to work at
FullHD)
1. Added 10M resistor in parallel to 32768 crystal else there
might be hang-ups
2. Changed to 32768 crystal to SMD one
3. Few libraries updated
4. Added pads of two tantalum capacitors C222 and C223 near
the USB-host
5. Positions adjusted – A20, NAND, SPIFLASH, LAN, matrix,
capacitors, CARDs and other
6. Added tantalum capacitor 220uF/10V to ISPOUT
7. R48(13k/1%) changed to 6.8k/1% so there would be 1A of
current on USB1; USB2 still gets 523mA maximum
1. Added a 220uF/tant to SATA PWR
2. C216 changed from 100n to 22uF/6.3V, the improve hard-disk
switching on
3. Update of all component libraries. HDMI connector is
changed to a new package.
4. Now not placing ESD protection buffers due to hardware
difficulties with their placement
Page 50 of 56
A20-OLinuXino-MICRO user's manual
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