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Quectel EC20 Hardware Manual

Also see for EC20: Circuit diagramsAT Command manual

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Contents
  1. About the Document
  2. Table Of Contents
  3. Table Index
  4. Figure Index
  5. Introduction
  6. Safety Information
  7. Product Concept
  8. Key Features
  9. Functional Diagram
  10. Application Interface
  11. Pin Assignment
  12. Power Supply
  13. USIM Card Interface
  14. USB Interface
  15. UART Interface
  16. PCM and I2C Interface
  17. Control Signals
  18. RI Signal
  19. PERST# Signal
  20. Antenna Interface
  21. Electrical and Radio Characteristics
  22. IO Requirements
  23. GNSS Receiver
  24. ESD Characteristics
  25. Mechanical Dimensions
  26. Standard Dimensions of Mini PCI Express
Quectel EC20 Hardware Manual Manual pdf 20 page image
LTE Module SeriesEC20 Mini PCIe Hardware DesignEC20_Mini_PCIe_Hardware_Design Confidential / Released 19 / 36 To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other andshield them with surrounding ground. In order to offer good ESD protection, it is recommended to add TVS. The 22R resistors should beadded in series between the module and USIM card so as to suppress the EMI spurious transmissionand enhance the ESD protection. The 33pF capacitors are used for filtering interference ofGSM850/EGSM900. Please note that the USIM peripheral circuit should be close to the USIM cardholder. The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout traceand sensitive occasion are applied, and should be placed close to the holder.3.5. USB InterfaceThe following table shows the pin definition of USB interface.Table 7: USB Pin DefinitionEC20 Mini PCIe is compliant with USB 2.0 specification. It can only be used as a slave device. Meanwhile,it supports high speed (480Mbps) and full speed (12Mbps) mode. The USB interface is used for ATcommand, data transmission, GNSS NMEA output, software debug and firmware upgrade. The followingfigure shows the reference circuit of USB interface.ModuleGNDMCUDifferential layoutUSB_DMGNDNM_2pFVCC_MCUVCCUSB_DPUSB_DMUSB_DPFigure 5: Reference Circuit of USB InterfacePin No. Pin Name I/O Description Comment36 USB_DM IO USB differential data (-) Require differential impedance of 90Ω38 USB_DP IO USB differential data (+) Require differential impedance of 90ΩQuectelConfidential
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