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UBX-15029985 - R08

C1-Public

www.u-blox.com

NEO-8Q / NEO-M8

u-blox 8 / M8 GNSS modules

Hardware integration manual

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Abstract

This document describes the features and specifications of u-blox NEO-8Q and NEO-M8 series
modules.

Содержание NEO-M8N

Страница 1: ...9985 R08 C1 Public www u blox com NEO 8Q NEO M8 u blox 8 M8 GNSS modules Hardware integration manual Abstract This document describes the features and specifications of u blox NEO 8Q and NEO M8 series...

Страница 2: ...M Q T Declaration of Conformity DoC is available at www u blox com in Support Product resources Conformity Declaration This document applies to the following products Product name Type number ROM FLAS...

Страница 3: ...rnal interrupt 8 1 5 3 SAFEBOOT_N 9 1 5 4 D_SEL Interface select 9 1 5 5 TIMEPULSE TIMEPULSE1 on NEO M8T 9 1 5 6 TIMEPULSE2 9 1 5 7 LNA_EN LNA enable 9 1 6 Electromagnetic interference on I O lines 10...

Страница 4: ...9985 Production information Contents Page 4 of 5 C1 Public 4 2 Soldering 19 4 3 EOS ESD EMI precautions 22 4 4 Applications with cellular modules 25 Appendix 27 A Glossary 27 B Recommended parts 27 Re...

Страница 5: ...attery supply is not interrupted For the NEO M8N and NEO M8J modules configuration can be saved permanently in SQI flash 1 3 Connecting power The u blox NEO 8Q and NEO M8 series modules have three pow...

Страница 6: ...ill runs providing a timing reference for the receiver This operating mode is called Hardware Backup Mode which enables all relevant data to be saved in the backup RAM to allow a hot or warm start lat...

Страница 7: ...Depending on the characteristics of the LDO U1 it is recommended to add a pull down resistor R11 at its output to ensure VDD_USB is not floating if the LDO U1 is disabled or the USB cable is not conn...

Страница 8: ...can be enabled and configured by AT commands sent to the u blox cellular module supporting the feature For more information see the GPS Implementation and Aiding Features in u blox wireless modules 8...

Страница 9: ...ure service updates and reconfiguration On the NEO M8T module a configurable TIMEPULSE2 signal can be programmed on TP2 SAFEBOOT_N Do not pull low during reset 1 5 4 D_SEL Interface select The D_SEL p...

Страница 10: ...ded high impedance line it is possible to generate noise in the order of volts and not only distort receiver operation but also damage it permanently On the other hand noise generated at the I O pins...

Страница 11: ...rial input Internal pull up resistor to VCC Leave open if not used If pin 2 low SPI MOSI USB USB_DM 5 I O USB I O line USB bidirectional communication pin Leave open if unused USB_DP 6 I O USB I O lin...

Страница 12: ...gn This is a minimal design for a NEO 8Q and NEO M8 series GNSS receiver Figure 4 NEO 8Q NEO M8 passive antenna design NEO M8M can support passive antenna but for optimal operation it requires an exte...

Страница 13: ...re with the antenna performance Passive antennas do not require a DC bias voltage and can be directly connected to the RF input pin RF_IN Sometimes they may also need a passive matching network to mat...

Страница 14: ...In that case the LNA must be placed close to the passive antenna Figure 8 NEO M8N J T Q and NEO 8Q module design with passive antenna and an external LNA The LNA_EN pin LNA enable can be used to turn...

Страница 15: ...nna e g 3 0 V use the filtered supply voltage available at pin VCC_RF as shown in Figure 9 For exact pin orientation see the corresponding product data sheet Active antenna design using VCC_RF pin to...

Страница 16: ...ignal tracking Sources can include co located power devices cooling fans or thermal conduction via the PCB Consider the following questions when designing in the module Is the receiver placed away fro...

Страница 17: ...O M8 series Remarks for migration Pin name Typical assignment Pin name Typical assignment 1 SAFEBOOT_N Leave open SAFEBOOT_N Leave open No difference 2 SS_N SPI slave select D_SEL Selects the interfac...

Страница 18: ...used RESERVED Leave open 17 RESERVED Leave open RESERVED Leave open No difference 18 SDA DDC data SDA DDC data SPI CS_N No difference for DDC If pin 2 low SPI chip select 19 SCL DDC clock SCL DDC cloc...

Страница 19: ...older joints on the connectors half vias should meet the appropriate IPC specification Reflow soldering A convection type soldering oven is highly recommended over the infrared type radiation oven Con...

Страница 20: ...ter soldering the u blox module consider an optical inspection step to check whether The module is properly aligned and centered over the pads All pads are properly soldered No excess solder has creat...

Страница 21: ...ing for example pins 1 and 15 and continue from left to right Rework The u blox module can be unsoldered from the baseboard using a hot air gun When using a hot air gun for unsoldering the module a ma...

Страница 22: ...serve strict EOS ESD EMI handling and protection measures To prevent overstress damage at the RF_IN of your receiver never exceed the maximum input power see the corresponding product data sheet Elect...

Страница 23: ...employ additional ESD protection measures Using an LNA with appropriate ESD rating can provide enhanced GNSS performance with passive antennas and increases ESD protection Most defects caused by ESD...

Страница 24: ...ceiver or resulting in unstable performance In addition to EMI degradation due to self jamming see section 1 5 any electronic device near the GNSS receiver can emit noise that can lead to EMI disturba...

Страница 25: ...dditional input filter is needed on the GNSS side to block the high energy emitted by the cellular transmitter Examples of these kinds of filters are the SAW Filters from Epcos B9444 or B7839 or Murat...

Страница 26: ...that are different from the GNSS carrier see Figure 16 The main sources are wireless communication systems such as cellular CDMA WCDMA Wi Fi BT etc Figure 16 Out band interference signals Measures ag...

Страница 27: ...nded parts Recommended parts are selected on data sheet basis only Other components may also be used Part Manufacturer Part ID Remarks Parameters to consider Diode ON Semiconductor ESD9R3 3ST5G Stando...

Страница 28: ...5 Array type For data signals 4 circuits in 1 package Feed through Capacitor Murata NFM18PC NFM21P 0603 2A 0805 4A Rs 0 5 Resistor 10 10 min 0 250 W Rbias 560 5 R2 100 k 5 R3 R4 Table 6 Recommended pa...

Страница 29: ...including Protocol Specification Public version UBX 13003221 5 GPS Antenna Application note GPS X 08014 6 GPS Compendium GPS X 02007 7 I2C bus specification Rev 6 4 April 2014 http www nxp com docume...

Страница 30: ...ntended use case for EMI in section 4 3 EOS ESD EMI precautions updated legal statement on the cover page and added Documentation feedback e mail address in contacts page R05 10 Jul 2019 jesk Clarifie...

Страница 31: ..._ap u blox com Regional Office China Beijing Phone 86 10 68 133 545 E mail info_cn u blox com Support support_cn u blox com Regional Office China Chongqing Phone 86 23 6815 1588 E mail info_cn u blox...

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