Hi Dragan,
On 1/26/24 12:04, Dragan Simic wrote:
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Hello Quentin,
On 2024-01-26 11:37, Quentin Schulz wrote:
On 1/26/24 03:57, Kever Yang wrote:
On 2024/1/25 19:02, Quentin Schulz wrote:
We don't have a dedicated CD pin for the SD card connector.
https://www.digikey.com/en/products/detail/molex/0472192001/3044807
is the SD card connector we use.
Thanks for your information, but I think you are using the wrong
microSD connector for rk3588 and maybe also for other rockchip SoCs.
Here are four microSD card connector from the web you provide, all of
them have card detect signal available for pcb:
https://www.digikey.com/en/product-highlight/m/molex-connector/sd-memory-card-connectors
None of those fit our requirements. We need a safe system that doesn't
break because of vibrations or shocks. Push-pull connectors are out of
question for our design. We have had issues with our Q7 devkit with
push-pull connector with SD cards slightly smaller or inserted
somewhat the wrong way. I can recall also countless of discussions in
the early days of the Raspberry Pis where there were a lot of issues
related to SD cards.
This is basically the mechanism we are using
https://media.distrelec.com/Web/WebShopImages/landscape_large/4-/01/Molex-500901-0801-30161714-01.jpg
Please, allow me to interject... I'm really curious why don't you
use eMMC chips instead of microSD cards? I mean, if the reliability
is of utmost importance, I wouldn't even consider microSD cards, not
even the high-endurance variants.
We have both :)
Just to name one potential use-case, you may want to save some data on
SD card for investigation without the need for the system to run to dump
data from the eMMC. It's there anyway, so now my job as a SW guy is to
support it :)
Quentin
