Closed right-0903 closed 9 months ago
Hi,
The first prototype didn't have any write protection capabilities and is no longer supported by firmware and software. (It wasn't built according to the current schematic, it was just a piece of PCB cut out of an old motherboard.) Refer to the latest schematic.
I'll answer your questions in regards to the latest schematic.
@1a2m3 OK, thanks. another question, you soldering pin 223 VDD, but you don't mention this, you show us gnd=2*
, shoud pin 233 be connected to GND?
No, pins 223 and 233 are not used. Those are VDD pins, required for RAM operation, but not for the programmer. The only power pin you need to use is VDDSPD. For ground you can use any of the VSS pins.
@1a2m3 Sorry 233 is a typo, I mean 223. I got this from micron
pin 4 Vssspd Supply Power pin 8 VDDSPD Supply Ground
it says vddspd is gnd, btw, can you show me all necessary soldering pins?(I am gonna to solder SA0=139, SA1=140, SA2=238, GND=241, SDA=285, SCL=141, VDDSPD=284, WP=78. ) I am asking my friend to solder. thanks.
All necessary pins you need are mentioned in the guide with photos on the forum here.
pin 4 Vssspd Supply Power pin 8 VDDSPD Supply Ground
Omg, They mixed those up, VSS is ground, VDD is power. Pin 8 on EEPROM should be VDD, ground is pin 4.
This document shows correct EEPROM pin descriptions.
This document shows correct EEPROM pin descriptions.
I see. The materials are shipping, I will try it later. Thanks again!
@1a2m3 I forget about 3.3k resistor, now I have only 1k, 510, 5.6k, can I use 3k,4k,or 5.6k to replace it?
The 3.3K resistor (R5) is part of the voltage divider loop for a VHV feedback circuit. It's value is tied to the R4 resistor, so you can't just replace it alone. It has to be ~60% of R4's value. The values I chose (5.6K and 3.3K) will result in 3.3V at the feedback output, which works for either 3.3V or 5V arduinos. You are free to adjust R4 and R5, just make sure the feedback voltage is within your arduino's safe input voltages (that can be 5V or 3.3V, depending on model), when HV_EN signal is on.
1K won't work. 3K might be a little too low for 5V models and is fine for 3.3V models. 4K is fine for 5V models, but might be unsafe for 3.3V models. 5.6K is fine for 5V models, but is not safe for 3.3V models.
The 3.3K resistor (R5) is part of the voltage divider loop for a VHV feedback circuit. It's value is tied to the R4 resistor, so you can't just replace it alone. It has to be ~60% of R4's value. The values I chose (5.6K and 3.3K) will result in 3.3V at the feedback output, which works for either 3.3V or 5V arduinos. You are free to adjust R4 and R5, just make sure the feedback voltage is within your arduino's safe input voltages (that can be 5V or 3.3V, depending on model), when HV_EN signal is on.
inspiring answer, I use serial 6.6k and serial 4k to achieve it.
nice work!
I should state this at first, my knownledge about circuit is very limited. But I want to remove rswp in my so-dimm, I think I just need to know how to get the wires connected correctly, so I look into these pins. I have a glance at
first-prototype.jpg
in theimages
folder and the eda in theschematic
folder. The questions areC1
container? I don't notice that the container is connected to the circuit.