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| Please suggest a good cheap USB 16CH logic analyser |
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| rsjsouza:
--- Quote from: picitup on October 31, 2019, 02:42:30 pm ---I can't quite see the markings on my photo so I'll pop the case off and report back once I've drank more coffee :-) --- End quote --- I read "AVF", which corresponds to the op amp: TLV272. The network of resistors and capacitors seem to agree with that. |
| picitup:
Thanks for that @rsjsouza The markings are TI 7B AVF as you say so that ties up with it being a TI part. I couldn't find it anywhere. So that still leaves no obvious clock for the FPGA. I could maybe add some capacitance to the xtal and see if it puts the measurement out. The TI site identifies the AVF marking with the TLV272CDGK part here: https://www.ti.com/store/ti/en/p/product/?p=TLV272CDGK Hmmm.... |
| picitup:
Hi again I've spent a bit of time identifying the chips and have updated the chip markings on the piccy of the board. Here's what I've come up with so far: U1 - Altera Cyclone IV FPGA https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/cyclone-iv/cyiv-53001.pdf U2, U4, U5, U7 - V05 SRV05-4 ESD Protection Diode Array https://www.onsemi.com/pub/Collateral/SRV05-4-D.PDF U3 - CY7C68013A Cypress USB Microcontroller High-Speed USB Peripheral Controller https://www.cypress.com/file/138911/download U6, U8 - YJAA SGM2019A - Low Power, Low Dropout, 250mA, RF-Linear Regulators http://www.wandec.com/upfile/SGM2019.pdf U9 - 24C02N IIC-Compatible (2-wire) Serial EEPROM 2Mbit https://www.mouser.co.uk/datasheet/2/268/Atmel-8828-SEEPROM-AT24CM02-Datasheet-1398087.pdf U10 - IC ?????????????? U11, U12 - K4T1G1604G 1 Gbit DDR RAM https://www.samsung.com/semiconductor/global.semi/file/resource/2017/11/DS_K4T1G08_16_4QJ-B_Rev1_0-1.pdf U13, U16 - SC2HF SGM6013 1.6MHz, 600mA Synchronous Step-Down Converter http://www.datasheet-pdf.com/mobile/1301564/SGM6013.html U14 - TI 7B AVF TLV272CDGK - Dual 16V, 3MHz, 550-uA/ch, rail-to-rail output op amp https://www.ti.com/store/ti/en/p/product/?p=TLV272CDGK U15 - PFNI TPS60403 - 60mA Charge Pump Voltage Inverter with Fixed 250kHz Operation http://www.ti.com/lit/ds/symlink/tps60403.pdf So that's all of them apart from U10 which is just marked IC and I can't find that one for some reason! :scared: |
| Daixiwen:
U10 is probably an SPI flash to configure the FPGA, such as an Intel/Altera EPCS16 or a Micron MT25Q |
| picitup:
Yes, I think you're right. The track and resistor to the LED threw me a bit, but this actually goes to the FPGA, not U10. So back to the start, I'm guessing the FPGA is clocked by the Cypress XTAL. I wonder...... The Cypress data sheet says XTALIN can be either an XTAL or 3.3v square wave. Does anyone know if this is an automatic switchover, or would it require the pin reconfguiring through firmware? Hm..... |
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