Quectel M85 Hardware Design

M85_Hardware_Design Confidential / Released 17 / 92 Table 3: M85 Pin Assignment PIN NO. PIN NAME PIN NO. PIN NAME PIN NO. PIN NAME 1 RESERVED 2 ADC0 3 RESERVED 4 NETLIGHT 5 SPK2P 6 AGND 7 MIC2P 8 MIC2N 9 MIC1P 10 MIC1N 11 SPK1N 12 SPK1P 13 LOUDSPKN 14 LOUDSPKP 15 PWRKEY 16 STATUS 17 EMERG_OFF 18 PCM_IN 19 PCM_CLK 20 PCM_OUT 21 PCM_SYNC 22 RESERVED 23 RESERVED 24 RESERVED 25 RESERVED 26 RESERVED 27 RESERVED 28 RESERVED 29 RESERVED 30 RESERVED 31 RESERVED 32 ...

M85_Hardware_Design Confidential / Released 77 / 92 6 Mechanical Dimensions This chapter describes the mechanical dimensions of the module. 6.1. Mechanical Dimensions Of Module Figure 52: M85 Module Top and Side Dimensions (Unit: mm) Quectel Confidential ...

M85_Hardware_Design Confidential / Released 39 / 92 Synchronization between DTE and DCE: When DCE (the module) powers on with the autobauding enabled, it is recommended to wait 2 to 3 seconds before sending the first AT character. After receiving the ―OK‖ response, DTE and DCE are correctly synchronized. If the host controller needs URC in the mode of autobauding, it must be synchronized firstly. Otherwise the URC will be discarded. Restrictions on aut ...

M85_Hardware_Design Confidential / Released 34 / 92 For detailed information about ―AT+CFUN‖, please refer to the document [1]. 3.5.2. SLEEP Mode The SLEEP mode is disabled by default. You can enable it by ―AT+QSCLK=1‖. On the other hand, the default setting is ―AT+QSCLK=0‖ and in this mode, the module cannot enter SLEEP mode. When the module is set by the command with ―AT+QSCLK=1‖, you can control the module to enter or exit from the SLEEP ...

M85_Hardware_Design Confidential / Released 67 / 92 Table 26: Pin Definition of the STATUS Module 300R 4.7K 47K VBAT STATUS Figure 49: Reference Design for STATUS Name Pin Description STATUS 16 Indicate module operating status Quectel Confidential ...

M85_Hardware_Design Confidential / Released 26 / 92 VBAT C2 C1 + C3 C4 GND 100uF 100nF 10pF 0603 33pF 0603 Figure 4: Reference circuit for the VBAT Input 3.3.3. Reference Design For Power Supply The power design for the module is very important, since the performance of power supply for the module largely depends on the power source. The power supply is capable of providing the sufficient current up to 2A at least. If the voltage drop between the input and ...

M85_Hardware_Design Confidential / Released 35 / 92 3.6. RTC Backup The RTC (Real Time Clock) function is supported by M85 module. The RTC is designed to work with an external 32.768KHZ crystal and an internal power supply. If VBAT voltage is not present, a backup power supply such as a coin-cell battery (rechargeable or non-chargeable) or a super-cap can be used. The VRTC pin is voltage input for RTC and a 1.5K resistor is integrated in the module for pea ...

M85_Hardware_Design Confidential / Released 11 / 92 2 Product Concept 2.1. General Description M85 is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz, GSM900MHz, DCS1800MHz and PCS1900MHz. The M85 features GPRS multi-slot class 12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. For more details about GPRS multi-slot classes and coding schemes, please refer to the Appendix B & C. With a tiny profile of 24.5mm×25.3mm×2.6 ...