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Summary of Contents for Quectel EG9 Series
- Page 1 EG9x Reference Design LTE Module Series Rev. EG9x_Reference_Design_Rev.A Date: 2018-02-09 Status: Released www.quectel.com...
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Page 2: General Notes
QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION. -
Page 3: About The Document
LTE Module Series EG9x Reference Design About the Document History Revision Date Author Description 2018-02-09 Felix YIN Initial EC20_R2.1_Reference_Design 2 / 4... - Page 4 LTE Module Series EG9x Reference Design Contents About the Document ........................... 2 Contents ............................... 3 Reference Design ..........................4 1.1. Introduction ..........................4 1.2. Schematics ..........................4 EC20_R2.1_Reference_Design 3 / 4...
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Page 5: Reference Design
LTE Module Series EG9x Reference Design Reference Design 1.1. Introduction This document provides the reference design for Quectel EG9x modules, which contain EG91 and EG95 modules. 1.2. Schematics The schematics illustrated in the following pages are provided for your reference only. -
Page 6: Module Interface
3. EG9x module provides a digital clock output (CLK_OUT) for an external audio codec, please refer to EG91 and EG95 Hardware Designs for further details. 4. SMD difference between EG9x-E and EG9x-NA is shown as below: Quectel Wireless Solutions Model... - Page 7 The VBUS pins of MCU and EG9x should be provided by 5V power system for USB detection, and VBUS_CONTROL is used to turn on and off VBUS power supply. VBUS_CONTROL is active high. Quectel Wireless Solutions 3. AP_READY is used to detect the MCU's sleep state. For more details about AP_READY, please refer to EG91 and EG95 Hardware Designs...
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Page 8: Power Supply Design
2. The power supply must be able to provide sufficient current up to 2A or more. 2. The following power-on/off sequences should be complied with to ensure the audio codec works normally. Power-on Sequence: power on VDD_1V8 first, then VDD_3.3V. Power-off Sequence: power off VDD_3.3V first, then VDD_1V8. Quectel Wireless Solutions DRAWN BY PROJECT TITLE... - Page 9 2. If a high baud rate is needed, it is highly recommended to install a 1nF capacitor (C0403/C0404) on transistor circiut. 3. The transistor circuit of DTR is similar to that of RTS interface, and the transistor circuit of RI and DCD is similar to that of CTS interface. Quectel Wireless Solutions DRAWN BY...
- Page 10 2. ALC5616 power-off sequence: close codec function by software -> MICVDD -> DBVDD/I2C pull-up power/AVDD/DACREF/CPVDD. 3. EG9x module will automatically initialize the codec via I2C interface after it is turned on successfully, so all power supplies for the codec need to be powered on before that. Quectel Wireless Solutions DRAWN BY...
- Page 11 3. The RESET pin must be driven at low level for at least 10ns after all power supplies for TLV320AIC3104 are at their specified values. 4. EG9x module will automatically initialize the codec via I2C interface after it is turned on successfully, so all power supplies for the codec need to be powered on before that. Quectel Wireless Solutions PROJECT...
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Page 12: Audio Interface
4. All MIC and SPK signal traces should be routed with total grounding and far away from noise such as clock and DC-DC signals, etc. 5. ALC5616 and TLV320AIC3104 cannot be used simultaneously in audio codec Quectel Wireless Solutions PROJECT... -
Page 13: (U)Sim Interface
6. EG9x module provides two input pins (USIM1_PRESENCE and USIM2_PRESENCE) to detect whether the USIM1 and USIM2 cards are present or not. It supports both low level and high level detections. For more details, please refer to EG91 and EG95 Hardware Designs. Quectel Wireless Solutions PROJECT... - Page 14 C0903 and C0904 are reserved for impedance matching. GNSS Antenna Interface J0903 Gnss antenna R0903 ANT_GPS C0905 C0906 C0905 and C0906 are reserved for impedance matching. Quectel Wireless Solutions PROJECT TITLE DRAWN BY Felix YIN EG9x Reference Design SIZE CHECKED BY...
- Page 15 Notes: 1. Both USB and debug UART interfaces are reserved for software debugging. 2. USB interface can also be used to upgrade firmware. Quectel Wireless Solutions 3. Keep USB test points to USB pins as close as possible. PROJECT TITLE DRAWN BY 4.
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