main_board_overview
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This is the board that everything connects to. It is what the TQMa6x SOM plugs into, and contains all the circuitry needed to run it. It also contains the pic32.
Chips
In no particular order:
| part | location | ref | description & notes |
|---|---|---|---|
| SMSC USB2660i | top | IC601 | Dual SD card reader with integrated USB hub. Appears to be connected to the SOM's second root hub. First external downstream port connected to the SMSC USB2514Bi. |
| SMSC USB2514Bi | bottom | IC800 | 4 port USB hub. Third downstream port connected to the FTDI chip. |
| FTDI FT231XQ | bottom | IC805 | USB to UART converter for the barcode reader. |
| SMSC USB2512Bi | bottom | IC600 | 2 port USB hub. Possibly only accessible by the usb_service connector. |
| PCF2129T | bottom | IC200 | RTC, battery backed. |
| 24LC64 | bottom | IC503 | 8kbyte i2c EEPROM, probably for the pic32. |
| ST 24c04wp | bottom | IC603 | 512byte i2c EEPROM, maybe for the USB2660i's configuration data? |
| KSZ9031MNXIC | top, under SOM | IC(4?)00 | Ethernet phy. |
| TI TS3A5018 | top, under SOM | IC301 | Marked “ya018”. Analog switches, maybe for the SPI flash? |
| 25Q128A | top, under SOM | IC302 | 16Mbyte serial NOR flash. Contains the bootloader for the SOM. |
| 74HCT4051 | top, under SOM | IC50(?), IC502 | Two analog switch chips, might be USB related. |
| PIC32MX795F512L | bottom | IC500 | pic32 |
| - | top | IC902 | Unpopulated footprint for a TI WL18xx WiLink module. |
There are a few more scattered around. Most are likely for power management, but this list is also missing an audio amplifier.
main_board_overview.1769559639.txt.gz · Last modified: by asb