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EVA-M8M - Hardware Integration Manual

Appendix

A

Reference schematics

A.1

Cost optimized circuit

•

Passive Antenna

•

No RTC crystal

•

No backup battery

•

UART and DDC for communication to host

Figure 13: Cost optimized circuit

UBX-14006179 - R01

Advance Information

Appendix

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Summary of Contents for EVA-M8M

Page 1: ...VA M8M concurrent GNSS modules featuring the u blox M8 positioning engine The EVA M8M series boasts the industry s smallest form factor and is a fully tested standalone solution that requires no host...

Page 2: ...h FW 2 01 N A EVA M8M EVA M8M 1 00 ROM 2 01 Flash FW 2 01 N A u blox reserves all rights to this document and the information contained herein Products names logos and designs described herein may in...

Page 3: ...r points out key information pertaining to module integration and performance A warning symbol indicates actions that could negatively influence or damage the module Questions If you have any question...

Page 4: ...3 2 3 4 Electromagnetic interference on I O lines 14 2 4 Real Time Clock RTC 14 2 4 1 RTC using a crystal 15 2 4 2 RTC derived from the system clock 15 2 4 3 RTC using an external clock 15 2 4 4 Time...

Page 5: ...ing 28 3 3 9 Use of ultrasonic processes 28 4 Product testing 29 4 1 Test parameters for OEM manufacturer 29 4 2 System sensitivity test 29 4 2 1 Guidelines for sensitivity tests 29 4 2 2 Go No go tes...

Page 6: ...rational amplifier U6 41 B 10 Open drain buffer U4 U7 and U8 41 B 11 Antenna supervisor switch transistor T1 41 B 12 Ferrite beads FB1 41 B 13 Feed thru capacitors 42 B 14 Inductor L 42 B 15 Standard...

Page 7: ...8M 0 defaults to GPS QZSS GLONASS and fits global applications whereas EVA M8M 1 defaults to GPS QZSS BeiDou making it the ideal module for China The right satellite constellations can be selected wit...

Page 8: ...VA M8M an additional external LNA is mandatory if a passive antenna is used to achieve the performance values as written in the EVA M8M Data Sheet 1 2 1 Power management 2 1 1 Overview The EVA M8M mod...

Page 9: ...f no backup supply is available connect V_BCKP to VCC_IO Avoid high resistance on the V_BCKP line During the switch from main supply to backup supply a short current adjustment peak can cause high vol...

Page 10: ...gured by proper AT commands sent to the involved u blox cellular module supporting the feature For more information see the GPS Implementation and Aiding Features in u blox wireless modules 5 The TX R...

Page 11: ...bus powered mode The required mode can be configured using the UBX CFG USB message Also the vendor ID vendor string product ID and product string can be changed In order to get the 90 differential im...

Page 12: ...save AssistNow Offline and AssistNow Autonomous information as well as Current configuration data However to run Firmware from the SQI Flash and provide space for logging results a minimum size of 8...

Page 13: ...ion is disabled by default By default the external interrupt is disabled For further information see the u blox M8 Receiver Description Including Protocol Specification 2 If the EXTINT is configured f...

Page 14: ...on 2 The open drain buffers U4 U7 and U8 e g Fairchild NC7WZ07 are needed to shift the voltage levels R3 is required as a passive pull up to control T1 because U4 has an open drain output R4 serves as...

Page 15: ...e RTC_I pin Make sure that the 32 768 kHz reference signal is always turned on and the voltage at the RTC_I pin does not exceed 350 mVpp Adjusting of the voltage level typ 200 mVpp can be achieved wit...

Page 16: ...which has be low to turn off The the function of the ANT_OFF pin can be inverted by sending the following sequence to the receiver B5 62 06 41 0C 00 00 00 03 1F 90 47 4F B1 FF FF EA FF 33 98 Applying...

Page 17: ...er Description Including Protocol Specification 2 Safe Boot Mode is used in production to program the SQI Flash It is recommended to have the possibility to pull the SAFEBOOT_N pin low when the EVA M8...

Page 18: ...is used to achieve the performance values as written in the EVA M8M Data Sheet 1 Make sure the antenna is not placed close to noisy parts of the circuitry and not facing noisy parts e g micro control...

Page 19: ...not used SQI_D1 I O Data line 1 to external SQI flash memory or reserved configuration pin Leave open if not used SQI_CS I O Chip select for external SQI flash memory or configuration enable pin Leav...

Page 20: ...be 50 Ohms and be routed in a section of the PCB where minimal interference from noise sources can be expected Make sure around the RF line is only GND as well as under the RF line In case of a multi...

Page 21: ...mance is the placement of the receiver on the PCB The connection to the antenna must be as short as possible to avoid jamming into the very sensitive RF section Make sure that RF critical circuits are...

Page 22: ...s in existing NEO xM modules based products The C88 M8M series integrates the EVA M8M GNSS modules into a NEO form factor adaptor board i e with the same dimensions and pinout as the NEO 6M NEO 7M and...

Page 23: ...figuration pin SPI Clock Leave open if not used RESERVED Leave open Different functions Only compatible if this pin is left open 17 RESERVED Leave open RESERVED Leave open No difference 18 SDA DDC Dat...

Page 24: ...two objects at different electrical potentials caused by direct contact or induced by an electrostatic field The term is usually used in the electronics and other industries to describe momentary unw...

Page 25: ...eached with careful placement of the antennas If such isolation can t be achieved e g in the case of an integrated GSM GNSS antenna an additional input filter is needed on the GNSS side to block the h...

Page 26: ...rces are wireless communication systems such as GSM CDMA WCDMA WiFi BT etc 0 500 1000 1500 2000 GPS input filter characteristics 0 110 0 500 1500 2000 Frequency M Hz GSM 900 GSM 1800 GSM 1900 Pow er d...

Page 27: ...n to standard ESD safety practices the following measures should be taken into account whenever handling the receiver Unless there is a galvanic coupling between the local GND i e the work table and t...

Page 28: ...M8M modules 3 3 5 Wave soldering Base boards with combined through hole technology THT components and surface mount technology SMT devices require wave soldering to solder the THT components Only a si...

Page 29: ...Figure 12 Multi GNSS generator 4 2 1 Guidelines for sensitivity tests 1 Connect a Multi GNSS generator to the OEM product 2 Choose the power level in a way that the Golden Device would report a C No r...

Page 30: ...pendix A Reference schematics A 1 Cost optimized circuit Passive Antenna No RTC crystal No backup battery UART and DDC for communication to host Figure 13 Cost optimized circuit UBX 14006179 R01 Advan...

Page 31: ...anual A 2 Best performance circuit with passive antenna External LNA RTC crystal Backup battery UART and DDC for communication to host Figure 14 Best performance circuit UBX 14006179 R01 Advance Infor...

Page 32: ...ng immunity with passive antenna External SAW filter LNA SAW filter RTC crystal Backup battery UART and DDC for communication to host Figure 15 Standard circuit for an improved jamming immunity UBX 14...

Page 33: ...Manual A 4 Circuit using active antenna Active antenna RTC crystal Backup battery UART and DDC for communication to host Figure 16 Standard circuit using active antenna UBX 14006179 R01 Advance Inform...

Page 34: ...5 USB self powered circuit with passive antenna External LNA RTC crystal Backup battery UART and DDC for communication to host USB interface Figure 17 USB self powered circuit UBX 14006179 R01 Advanc...

Page 35: ...nual A 6 USB bus powered circuit with passive antenna External LNA RTC crystal Backup battery SPI for communication to host USB interface Figure 18 USB bus powered circuit UBX 14006179 R01 Advance Inf...

Page 36: ...Circuit using 2 pin antenna supervisor 2 pin antenna supervisor RTC crystal Backup battery UART and DDC for communication to host Figure 19 Circuit using 2 pin antenna supervisor UBX 14006179 R01 Adv...

Page 37: ...Circuit using 3 pin antenna supervisor 3 pin antenna supervisor RTC crystal Backup battery UART and DDC for communication to host Figure 20 Circuit using 3 pin antenna supervisor UBX 14006179 R01 Adv...

Page 38: ...S Antenna Active GNSS Antenna SAW 2G cellular 3G 4G cellular 2G 3G 4G cellular MAX 6 Any NEO 6 Any LEA 6 Any EVA 7 M MAX 7 C W Q NEO 7 N M P EVA M8 M MAX M8 C W Q NEO M8 N M Q LEA M8 S PAM 7 Q CAM M8...

Page 39: ...TC crystal B 2 RF band pass filter F1 Depending on the application circuit consult manufacturer data sheet for DC ESD and RF power ratings Manufacturer Order No System supported Comments TDK EPCOS B84...

Page 40: ...B0F0A GPS GLONASS Low insertion loss Only for mobile application Triquint B9850 GPS Compliant to the AEC Q200 standard CTS CER0032A GPS Ceramic filter also offers robust ESD Protection TAI SAW TA1573A...

Page 41: ...mperature options Table 17 Recommend parts list for optional SQI Flash B 8 RF ESD protection diode D2 Manufacturer Order No ON Semiconductor ESD9R3 3ST5G Infineon ESD5V3U1U 02LS Table 18 Recommend par...

Page 42: ...lue C0 RF input DC block COG 47P 5 25V C1 Decoupling Capacitor X7R 10N 10 16V C2 Decoupling capacitor at VBUS Depends on USB LDO U2 specification C3 Decoupling capacitor at VBUS Depends on USB LDO U2...

Page 43: ...Area ESD Electrostatic discharge GLONASS Russian satellite system GND Ground GNSS Global Navigation Satellite System GPS Global Positioning System GSM Global System for Mobile Communications IEC Inte...

Page 44: ...ocu No GPS X 02007 5 GPS Implementation and Aiding Features in u blox wireless modules Docu No GSM G1 CS 09007 6 u blox 7 to u blox M8 Software Migration Guide Docu No UBX 13003254 For regular updates...

Page 45: ...u blox com Regional Office Australia Phone 61 2 8448 2016 E mail info_anz u blox com Support support_ap u blox com Regional Office China Beijing Phone 86 10 68 133 545 E mail info_cn u blox com Suppo...

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