| Electronics > Repair |
| Reverse engineer Dallas DS1742W? |
| << < (13/15) > >> |
| Dave Wise:
And... GlitchWorks has developed the GW-1742W-1. He's selling it at https://www.tindie.com/products/glitchwrks/glitch-works-gw-1742w-1-dallas-ds1742w-replacement/ . He's willing to program parts but he doesn't know the TDS3000 format, we'll have to send a dump. I have a Needhams EMP-300 programmer. I suspect I can read a DS1742W by calling it a 2716 eprom. |
| Dave Wise:
GlitchWorks GW-1742W-1 was out of stock, now available again on Tindie. I'll reserve one but I'm not ready, I'm using the scope and don't want to take it down. GW warned me off treating as 2716 EPROM: --- Quote ---**DO NOT** attempt to read the original as a 2716! You may inadvertently apply programming voltage which will fry the 1742W! You can safely read this part as a DS1220 NVRAM. If your current programmer doesn't support that, the cheap option is to get a TL866 or one of the newer revisions. We've successfully tested with that programmer in-shop to confirm compatibility for a customer. --- End quote --- Since my EMP-300 supports DS1220, that's what I'll set it for when I read my DS1742W. |
| james_s:
You can read them easily enough but writing them is where problems tend to crop up. I forget exactly what I ran into but I ended up wiring up some switches and LEDs (actually I used a FPGA dev board but only because I happened to have one) and manually programmed the needed bytes and configuration bits by hand. |
| bschwand:
--- Quote from: james_s on March 21, 2020, 12:51:43 am ---We know exactly what's inside these, the PowerCap version is not potted. There is an off the shelf SRAM, a battery, a 32kHz crystal, and a Dallas ASIC which is a RTC and battery backup controller. Due to the custom chip it doesn't really help you to know what's in there although you can cut the old battery out and solder in a new one. While the DS1742W is discontinued, the DS1744WP is in active production and I made an adapter using those to replace the DS1742W in Tek TDS3000 scopes. You can build one yourself if you like, aside from mechanical fitment constraints it will work in any application designed for the DS1742W, and the PowerCap package it uses has a replaceable battery. https://github.com/james10952001/DS1744WP-to-DS1742W-adapter --- End quote --- Is it possible to directly use that module in a Tek3034B or does it have to be programmed first ? |
| YetAnotherTechie:
On "B" models you will need to write the MAC address back on the ram, or the network will not work. |
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