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Add 'Hardware info'

Triss 2021-06-22 20:19:38 +00:00
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The SQ50 consists of the following components:
### BOM
* Top side:
* LED: status (green: application mode: orange: bootloader mode)
* MicroUSB-connector (to the host computer)
* 5-pin 2.54mm pin header, for probe IO
* Xilinx Spartan XC3S50AN TQG144AGQ1917 D5886160A 4C (QFP-144) ([datasheet with pinout](https://www.xilinx.com/support/documentation/data_sheets/ds557.pdf), [internal flash memory docs](https://www.xilinx.com/support/documentation/user_guides/ug333.pdf))
* ISSI IS61WV25616EDBLL-10TLI EAB217P5 1950 (RAM used for storing samples)
* FTDI HWJFS.00 FT240XQ 1741-D (USB interface) ([product info](https://ftdichip.com/products/ft240xq/), [datasheet](https://ftdichip.com/wp-content/uploads/2020/08/DS_FT240X.pdf), [proprietary drivers used by ScanaStudio](https://www.ftdichip.com/Drivers/D2XX/Linux/libftd2xx-x86_64-1.4.8.gz))
* TI OPA 4354A 912Q (quad opamp, [product info](https://www.ti.com/product/OPA4354))
* A number of analog components
* Bottom side:
* 8-pin 2mm pin header/connector (JTAG)
* 3 empty slots/solder pads for more ISSI chips (probably used in the SQ100/SQ200 variants)
* Empty solder pads for a SOIC-8 chip for unknown purpose
* 147776 TP949 6EAL (QFN-16, unknown purpose)
* A crystal oscillator, frequency/markings are impossibly tiny to read
### Photos
Outer shell:
![](https://cloud.lain.faith/apps/files_sharing/publicpreview/keFQb8DaK8m66QP?fileId=21068&file=/sq501.jpeg&x=1920&y=1080&a=true)
Top side of the PCB:
![](https://cloud.lain.faith/apps/files_sharing/publicpreview/keFQb8DaK8m66QP?fileId=21069&file=/sq503.jpeg&x=1920&y=1080&a=true)
Bottom side of the PCB:
![](https://cloud.lain.faith/apps/files_sharing/publicpreview/keFQb8DaK8m66QP?fileId=21070&file=/sq502.jpeg&x=1920&y=1080&a=true)