Neo_M680 Hardware User Guide Version 1.
Neo_M680 Hardware User Guide V1.0 Copyright Copyright © 2008 Neoway Technology All rights reserved. is a trade mark of Neoway Technology Co., Ltd. Notice This document is intended for the customer engineers. This document is subject to change without any notice. No responsibility is assumed by Neoway Technology for the use of this document. Neoway Technology always provides the best supports. For pricing, delivery, and ordering information please contact: Sales@neoway.com.
Neo_M680 Hardware User Guide V1.0 Contents Copyright ............................................................................................................................................ 2 1. Introduction ................................................................................................................................ 6 2. General Description ................................................................................................................... 6 3.
Neo_M680 Hardware User Guide V1.0 8. Package ..................................................................................................................................... 30 9. Terms and Abbreviations......................................................................................................... 31 Copyright Neoway Techlology Co., Ltd.
Neo_M680 Hardware User Guide V1.0 Document History Revision History Version Remarks Date Issue V1.0 Initial Version 2013-9 Copyright Neoway Techlology Co., Ltd.
Neo_M680 Hardware User Guide V1.0 1. Introduction This document describes the hardware features of M680, and guides for the relevant application design. 2. General Description With the ultra-compact design, M680 is intended to be used in a wide range of applications, including industrial and consumer devices. M680 is a GSM/GPRS module with EDGE of downlink. It features with voice, SMS, and data services. 3.
Neo_M680 Hardware User Guide V1.0 4. Key Features Table 1 M680 Key Features Feature Frequency Bands Implementation 850/900/1800/1900 MHz quad-band Compliant with GSM/GPRS Phase2/2+ Sensitivity Transmit Power < -107dBm 850/900 Class4(2W) 1800/1900 Class1(1W) AT GSM07.
Neo_M680 Hardware User Guide V1.0 5. Product Specifications 5.1 Variants Variants Frequencies Packages M680-QUAD-AA0/A00 850/900/1800/1900MHz Quad-band 71 Pin LCC 5.2 Dimension & Package Physical Characteristics Dimensions 15mm*18mm*2.1mm (Length*Width*Thickness) Weight 2g Package 71 Pin LCC Figure 2 M680 Sketch Copyright Neoway Techlology Co., Ltd.
Neo_M680 Hardware User Guide V1.0 5.3 Pin Description Table2 M680 pin definition M680 Pin Signal I/O Function Note 1 ON/OFF DI Switch the module on/off Low level pulse triggered 2 SPKP AO Speaker output P 3 AO 4 SPKN MICP0 AI Speaker output N MIC+ Use AT command to open and 0.9W@8Ω 5 MICN0 AI MIC- Vi ≤ 200mVpp AO Earpiece output L Signal Ended Output. Can drive a 16Ω/32Ω earpiece directly. Signal Ended Output. Can drive a 16Ω/32Ω earpiece directly.
Neo_M680 Hardware User Guide V1.0 33 Reserved Reserved 34 Reserved Reserved 35 Reserved Reserved 36 VMC PWR Output 2.8V 37 DI 38 URXD UTXD Serial data input of module Serial data output of module 39 Reserved Reserved 40 41 Reserved VRTC PWR Reserved RTC power 42 DTR DI Data Terminal Ready Can be used to control sleep mode. 43 RING DO Output for RING indicator Can be used to indicate an incoming voice call or SMS. 44 LIGHT DO Status LED 2.
Neo_M680 Hardware User Guide V1.0 70 71 Copyright Neoway Techlology Co., Ltd.
Neo_M680 Hardware User Guide V1.0 5.4 PCB foot print Recommended foot print: Figure 3 Recommended foot print of M680 (all dimensions in millimeters) Note： There may be some masks on the bottom of the module PCB, created by hollowing the solder resist layer, causing reveal of copper. To avoid short circuits, it is recommended to cover the application PCB with a silkscreen block at the area under the module, but excluding soldering area. Copyright Neoway Techlology Co., Ltd.
Neo_M680 Hardware User Guide V1.0 6. Application Interface 6.1 Power Supply Requirements Table3 Power Supply and ON/OFF Control Signal I/O Function Note VMC PWR 2.8V power output Can be used to power the level translators. Imax=5mA Reset DI Reset input Active low > 60mS. ON/OFF VBAT DI Switch the module on/off Main Power Supply Low level pulse triggered. PWR 3.5V~4.3V(typical 3.9V) 6.1.
Neo_M680 Hardware User Guide V1.0 Figure 4 Burst Caused Current Peaks and Voltage Drops Figure 5 Test Circuit and Peak Current Results may vary depending on the ESR of capacitors, and the impedance of power source. A low ESR 1000uF aluminum capacitor for C1 can be selected. As an alternative, a 470uF tantalum capacitor is also suited.
Neo_M680 Hardware User Guide V1.0 The power source should be able to output an average current greater than 1A. Some small capacitors, with values of 0.1uF, 100pF, 33pF, placed close to the module’s power pin, are very helpful to suppress high frequency disturbances. The voltage range of power supply must never be exceeded. Over-voltage can even destroy the module permanently. Ensure the trace for VBAT to be wide enough, in order to pass the current peaks without significant voltage drops.
Neo_M680 Hardware User Guide V1.0 Figure 7 Using PMOS for power control Q2 is for eliminating the need for a high enough voltage level of the host GPIO. In case that the GPIO can output a high voltage greater than VDD3V9 - |VGS(th)|, where VGS(th) is the Gate Threshold Voltage, Q2 is not needed. Reference components: Q1: IRML6401 Q2: MMBT3904 C4: 470uF tantalum capacitor rated at 6.3V; or 1000uF aluminum capacitor.
Neo_M680 Hardware User Guide V1.0 independent power, like a DC/DC or LDO. The inductor used in Reference Design (b), should be a power inductor and have a very low resistance. The value of 10uH, with average current ability>1.2A and low DC resistance, is recommended. Figure 8 Using separated power supply for module Never use a diode to make the drop voltage between a higher input and module power.
Neo_M680 Hardware User Guide V1.0 Figure 9 Turning on /off the module using ON/OFF 6.2.1 Turning on the module: While the module is off, drive the ON/OFF pin to ground for at least 600mS (800mS is recommended) and then release, the module will start. An unsolicited message will be sent to host through AT port (“+EIND: 1”), indicating the powering up of the module and the AT commands can respond. It’s recommended to drive the ON/OFF to low before applying the VBAT to module.
Neo_M680 Hardware User Guide V1.0 Figure 10 Reference circuit for ON/OFF control Reference Components: Q1: MMBT3904, or to use digital transistor with bias resistors built in, like DTC123/114 The combination of R3 and R4, should limit the high voltage of ON/OFF less than 3.0V. Note: If the host itself is not initialized before turning on the module, some abnormal conditions on IO or UART may affect the power on procedure.
Neo_M680 Hardware User Guide V1.0 6.3 UART 6.3.1 Basic Descriptions of UART Signal I/O Table 4 UART Function URXD1 UTXD1 DI DO Serial input of module Serial output of module DTR DI Signal for controlling sleep mode RING DO Ringing output Note UART1 is for AT commands, data sending/receiving, firmware updating, etc. As a DCE device, the module is connected to DTE as shown in Figure 11.
Neo_M680 Hardware User Guide V1.0 Figure 12 Interfacing with 3.3V logic levels of MCU If the UART is interfacing with a MCU that has 5V logic levels, general level translators are required, for both inputs and outputs. As shown in Figure 13. Figure 13 Interfacing with 5V logic levels of MCU Reference components: R2: 2K-10K. The higher rate the UART works at, the smaller value used R3: 4.7K-10K. The higher rate the UART works at, the smaller value used Q1: MMBT3904 or MMBT2222.
Neo_M680 Hardware User Guide V1.0 Note: Avoid sparks and glitches on UART signals while the module is in a turning on procedure. Avoid sending any data to UART during the beginning of 2 seconds after the module being turned on. 6.4 Sleep mode 6.4.1 DTR Generally DTR is used for sleep mode control. For details, see AT commands manual. Based on the setting of the selected mode, pulling DTR low will bring the module into relevant power saving mode.
Neo_M680 Hardware User Guide V1.0 sleep mode. 5) Pull DTR high, the module will exit from sleep mode actively, and furthermore enable the UART. Thus the voice call, received data, or SMS can be processed through UART. After processing finished pull it low again, to take the module back to sleep mode. 6.4.2 RING 1) Once the incoming voice call, the module sends out “ring” message through UART and meanwhile outputs 250mS low pulses at 4S period on RING signal. See Figure 14.
Neo_M680 Hardware User Guide V1.0 Figure 16a Reference design of SIM interface Pin1=VCC, Pin2=RST, Pin3=CLK, Pin4=GND, Pin5=VPP, Pin6=DATA Figure 16b a sample of SIM card socket Figure 16c the recommended ESD diode array M680 SIM interface is 3V/1.8V compatible. VSIM is for SIM power and can supply a 30mA current. SIM_DATA is internally pulled up with a 5KΩ resistor. External pull-up resistor is not needed. SIM_CLK can work at several frequencies, but at 3.25MHz typically.
Neo_M680 Hardware User Guide V1.0 ☆ The antenna should be installed a long distance away from the SIM card and SIM card traces, especially to the build-in antenna. ☆ The PCB traces of SIM should be as short as possible and shielded with GND copper. ☆ The ESD diodes or small capacitors should be closed to SIM card. Note: Small capacitors and the junction capacitance of the ESD diode are to avoid the interference from/to antenna, ensuring the correct SIM access and good RF performance. 6.
Neo_M680 Hardware User Guide V1.0 6.7 Audio Interface Table 7 Audio Interface Signal I/O Function Note SPKP AO Speaker output P SPKN MICP0 AO AI Speaker output N MIC+ input Use AT command to open and 0.
Neo_M680 Hardware User Guide V1.0 Figure 19 Reference design for MIC interface Figure 20 Reference design for Ear interface Figure 20 shows a reference design for earpiece interface. A 16Ω/32Ω earpiece can be directly driven by the module. To pass the low frequency audio, use large capacitors for C1 and C2. If an external amplifier is used for driving the speakers, 1uF~4.7uF coupling capacitors should be used to block the DC voltage, as shown in Figure 21. Copyright Neoway Techlology Co., Ltd.
Neo_M680 Hardware User Guide V1.0 Figure 21 Using capacitors to couple audio outputs As the description of TDD noise before, the GSM radio frequency is modulated at 217Hz. The 217Hz and its derivative frequency is well within audio band, therefore a TDD noise often affect the audio performance through power and air. Some small capacitors between 27pF-100pF and ferrite beads, placed on the audio path can attenuate TDD noise. For Suppressing the TDD noise, differential audio interface is preferable.
Neo_M680 Hardware User Guide V1.0 If the trace between the module and connector has to be longer, or built-in antenna is used, a π-type matching circuit should be needed, as shown in Figure 22. The types and values of C1, L1, and L2 should be verified by testing using network analyzer instrument. If the characteristic impedance is well matched, and VSWR requirement is met, just use a 0Ω resistor for C1 and leave L1, L2 un-installed. Avoid any other traces crossing the antenna trace on neighboring layer.
Neo_M680 Hardware User Guide V1.0 This GND Pad should be well routed to ground Antenna trace should be surrounded by ground which is connected to main ground plane with plenty of via holes. The trace width and the space to ground should be decided by calculating of 50Ω impedance match. Figure 24 Reference layout for antenna interface 7. Mounting the Module onto the Application Board M680 is compatible with industrial standard reflow profile for lead-free SMT process.
Neo_M680 Hardware User Guide V1.0 the baking procedure is also required. The baking should last for at least 24 hours at 90℃. 9.
ESD protection EADS requires that the M680 GPRS Module's service points have sufficient ESD protection (against static electricity) when servicing the product. Any product which has its covers removed must be handled with ESD protection. To replace the covers, ESD protection must be applied. All electronic parts of the product are susceptible to ESD. All ESD‐sensitive parts must be packed in metallized protective bags during shipping and handling outside any ESD Protected Area (EPA).
—Consult the dealer or an experienced radio/TV technician for help. Label of The End Product The final end product must be labeled in a visible are with the following “Contains TX FCC ID:PJ7‐1232”.The FCC part 15.19 statement below has to also be available on the label:This device complies with Part 15 of FCC rules.
