which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

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rudi ;-)
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby rudi ;-) » Tue Jun 20, 2017 1:22 am

ESP_Sprite wrote:I'm not quite convinced of that level shifter... at 1.8V, it has a throughput of 60MBPS, which is less than the 80MHz and dangerously close to the 40MHz the ESP32 can use as clock speeds, Also, I'm not entirely sure if the auto-direction-switching is enough for the way we use SPI.
i am now too not more sure, does the converter can drive so fast the lines
and there was other thinking too,
why we use 1.8 flash ..

there can be answeres
- cause we have just in time only 1.8 psram
- cause 3.3 flash to much noise
- cause 3.3 flash V^2 -> 4 times the energy - and more power - and this breaks in / off

...

ESP_Sprite wrote: Official answer: Get one of our devkits or modules that have integrated PSRAM, we can guarantee the hardware qualifications of those.
the only one that include psram - wrover modules - are just in time sold out
the wrover kits - there is a possible way to become one with wrover modul mounted and SoC Rev1 and psram
ESP_Sprite wrote: Unofficial answer (more like a suggestion; nothing guaranteed): The way we experimented with PSRAM before the modules with them on it were ready is to take a devkit, remove the 3.3V flash and replace it with 1.8V flash, then solder the PSRAM chip on top of it, deadbug style, with the CLK and CS pins floating and the rest connected to the flash chip; we use the fact that the psram chip has the same pinout as a normal flash chip. We then used thin wiring to wire the CS and CLK pins up, made sure to wire up the bootstrap pin was set in such a way that VDD_SIO is 1.8V (and the flash is connected to VDD_SIO), and that was enough to make it work; no level converters needed.
https://twitter.com/eMbeddedHome/status ... 9196505088
DA1Mr2pXkAAE3o1.jpg
DA1Mr2pXkAAE3o1.jpg (148.23 KiB) Viewed 1919 times
exactly this was the first thinking

cause i had no 1.8 flash -
i was start to try this with level converting
- resistor -( to to to slow )
- tbx0108 - i think perhabs not fast enough

now i get this weekend 128MiB 1.8 flash, 64MiB 1.8 psram, ( 32MiB 1.8 psram already here )
- pimp the wroom32 ( DevKitC ) like first thinking and you mentioned ( remove 3.3 flash, solder 1.8 flash, packagepack 1.8 psram, cs(16, pull_up vdd_sdio 1.8 ) and clk(17) ..... and bootstrap MTDI pulled_up 3.3

there is only the test, that the boot is ok with this hardware setup as base -
( cause DevKitC is SoC Rev0 there are then distrikes in psram - but this is ok )

txs, i know you are very stress and under pressure just at time - so - thank you for the time frame and help!

I give here now also a little peace and try this steps after receive the 1.8er flash
sure, 32MiB there are then here too, if i fall in next prob with 128MiB.
i will rewrite the result then .

( please check R9 in wrover modules - the info is missing in reference and guide that is already done boostrap 1.8 on the modul )

best wishes
rudi ;-)
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loboris
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby loboris » Tue Jun 20, 2017 7:55 am

rudi ;-) wrote:... the only one that include psram - wrover modules - are just in time sold out ...
still 2 in stock here https://www.analoglamb.com/product/esp- ... er-module/

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rudi ;-)
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby rudi ;-) » Tue Jun 20, 2017 8:47 am

loboris wrote:
rudi ;-) wrote:... the only one that include psram - wrover modules - are just in time sold out ...
still 2 in stock here https://www.analoglamb.com/product/esp- ... er-module/
txs boris, still 1 in stock :) ( btw this are the kits - espressif offer the module only too - but this are just in time sold out )
best wishes
rudi ;-)
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WiFive
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby WiFive » Wed Jun 21, 2017 8:26 pm

rudi ;-) wrote:...
Hey what was the name of that other PSRAM OEM (not lyontek) that also has dual ram/flash packages? I lost the link. :|

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rudi ;-)
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby rudi ;-) » Wed Jun 21, 2017 8:34 pm

WiFive wrote:
rudi ;-) wrote:...
Hey what was the name of that other PSRAM OEM (not lyontek) that also has dual ram/flash packages? I lost the link. :|
we talked in a very earliest thread about prices voltages and available things.. i think it was in "general discussion"..

we had lyonthek
and ...
... am searching just in time ... ..
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WiFive
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby WiFive » Wed Jun 21, 2017 8:43 pm

rudi ;-) wrote:
WiFive wrote:
rudi ;-) wrote:...
Hey what was the name of that other PSRAM OEM (not lyontek) that also has dual ram/flash packages? I lost the link. :|
we talked in a very earliest thread about prices voltages and available things.. i think it was in "general discussion"..

we had lyonthek
and ...
... am searching just in time ... ..
NVM found it: xtxtech.com

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rudi ;-)
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby rudi ;-) » Wed Jun 21, 2017 8:49 pm

w e had one other further more.. i search ...
( just in time not found ) ...


the next other we had was : XTX
( but this was not the talked, this comes later )
perhabs you mean this: PN18S32SOEUG , pSRAM 1.8, 32MiB

XTX.jpg
XTX.jpg (56.37 KiB) Viewed 1868 times

best wishes
rudi ;-)

ps: have a note about "SPI IOT RAM"
do not use for other things :mrgreen: it is dangerous :mrgreen:
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rudi ;-)
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby rudi ;-) » Wed Jun 21, 2017 8:54 pm

WiFive wrote:
rudi ;-) wrote:
WiFive wrote:
Hey what was the name of that other PSRAM OEM (not lyontek) that also has dual ram/flash packages? I lost the link. :|
we talked in a very earliest thread about prices voltages and available things.. i think it was in "general discussion"..

we had lyonthek
and ...
... am searching just in time ... ..
NVM found it: xtxtech.com
ha - have not seen your post :)
yeap - but we have one further more WiFive
XTX sell espressif's ESP-PSRAM32 -
better saying:
they send "samples" with ESP-PSRAM32 "brandmark"

best wishes
rudi ;-)
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WiFive
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby WiFive » Wed Jun 21, 2017 9:00 pm

Yes, relationship is unclear. Possible espressif was first volume customer for xtx psram. These are interesting http://www.xtxtech.com/en/products.asp?sid=61

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rudi ;-)
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Re: which new "esp" 8 pin ic is this on the new esp32 modul? ;-)

Postby rudi ;-) » Wed Jun 21, 2017 9:02 pm

WiFive wrote:Yes, relationship is unclear. Possible espressif was first volume customer for xtx psram. These are interesting http://www.xtxtech.com/en/products.asp?sid=61
a wide range of portfolio in density combination, supply voltage (1.8v/3v),

but you know they are BGA...

and Status : Development
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