Rev 3.0B |
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Rev 3.1 |
The main changes pertain to the bill of materials (BOM) and the layout:
- Replaced the caps C23, C24 with ceramic ones to minimize leakage current
- R62 is made to DNP by default so that the jumper is used to measure the hibernate current
- Miscellaneous silk screen changes to clearly annotate components on the board.
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Rev 3.2 |
- Layout changes for the DC-DC section to improve the mask margin
- Updated the silk screen to reflect the final markings.
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Rev 4.1 |
- Added pullup and pulldowns for the serial flash. (Reduces hibernate current to around 17 uA)
- Moved the nRESET pull from VCC_BRD to VBAT_CC (ensures always pulled high).
- Added pullup on UART_TX going to the FTDI to prevent false start bits.
- Added pullup resistor for acccelerometer address to avoid conflict with audio booster pack
- Added 100K pullup on RESET_OUT net for any BP without RESET pulls.
- Changed R61 to 2.7K, R57-> 270 Ω (To solve false entering to bootloader mode)
- Miscellaneous silk changes
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