The EM9191 is not detected when installed in the m.2B slot of our LattePanda single board computer. em9191-at-log on usb-c.txt (3.0 KB) Please find the AT command log attached. This output was captured on the lattepanda sbc, using the Sierra dev kit with EM9191 installed, connected using USB-C cab…

did you check PCIE_DIS signal? [image] PCIE_DIS signal in EM9190 MC/EM Series The EM9190 product technical specification defines a PCIE_DIS signal that allows selecting the host interface type (unconnected/low for PCIe, high for USB). Given that the default is PCIe, does…

Thank you for helping! It seems the pin 20 on lattepanda 3 delta m.2 Bkey slot is open (NC). We made a voltage divider with [pullup] two 10k resistors between 3.3V and GND, to give us a pullup voltage of 1.65V. We wired (soldered) this pull up voltage to the pin 20. “mmcli -L” still reports “No…

Here is some information for the lattepanda 3 delta SBC m2. b slot: From Specification - Documentation “M.2 Key B(2242/2252/2280): SATA III, USB2.0, USB3.0, SIM” Also, I have tried both with and without the SIM card installed in the SIM slot on the lattepanda3d.

How about pin 22? Maybe you need to compare pin to pin voltage with the devkit

We also tried a wide variety of adapter boards with no luck. EM9191 still works great in the Sierra DevKit board. Tried adding pullup to 1.8V on the adapter boards too. I measured the various signals and have not yet found the issue. I have built a schematic using the devkit manual schematic. Do …

pin 20 → high (1.8V) pin 22 → high (1.8V) check pin 28 for power loss acknowledge pin 24, pin 68, pin 38 → VCC (3.3V) You might need to contact distributor for a schematic review Btw, other user can make it work in m.2 adaptor: [image] EM9190: No response for AT!USBCOMP? comm…

EM9191 not found in LattePanda3Delta m.2Bkey slot

IoT Modules

jyijyi September 6, 2023, 5:13pm 2

did you check PCIE_DIS signal?

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EM9191 not found in LattePanda3Delta m.2Bkey slot

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