Good evening, I bought some ST4SIM-200M chips. They arrived a few days ago and I have now soldered one of these onto SIMCOM's SIM7000E modem.

[FBert.6]

I connected:

SIM7000E ->  ST4SIM-200M

PIN 30 SIM_VDD -> VCC

PIN 31 SIM_DATA -> I/O

PIN 32 SIM_CLK -> CLK

PIN 33 SIM_RST -> RST

When I send the AT+CCID command it returns: "+CME ERROR: SIM not inserted"

The same command with a standard plastic SIM card works and returns the right card's ICCID.

Did I make the wrong connections? Do I have to do something about RESET denied?

Thank you

[FBert.6]

Ok, it's work...

Maybe whena I solder the chip at 480C° I burned it.

Now I used a new chip and skipped it at 280C° and it work.

Thanks

[JMarshall123]

Hi I'm having very similar issues with my sim7600G and ST4SIM-200M. Was there any other connections you had to add, like the 20K pullup between SIM_VCC and SIM_IO? It recommends this pullup on the ST4SIM-200M datasheet, though I do not know if it's strictly required with SIMCOMM modules.DId you add much (if any) capacitance to the SIM_VCC line?

After I seen your post about the reflow temperature, I replaced the esim and used low melt solder, it's still responding with "+CME ERROR: SIM not inserted".