Products > Test Equipment
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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