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LEA-M8S / LEA-M8T - Hardware Integration Manual

UBX-13003140 - R07

Production Information

Design

Page 17 of 31

RF

Vcc

Rbias

R

R

R

I

_

3

2

2

•













+

=

Equation 1: Calculation of threshold current for open circuit detection

If the antenna supply voltage is not derived from

VCC_RF

, do not exceed the maximum voltage rating of

AADET_N

.

For recommended parts, see Appendix

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Содержание LEA-M8S

Страница 1: ...al Abstract This document describes the features and specifications of the cost effective and high performance LEA M8S and LEA M8T modules which feature the u blox M8 concurrent GNSS engine with recep...

Страница 2: ...LASH version PCN reference LEA M8S LEA M8S 0 00 ROM 2 01 N A LEA M8T LEA M8T 0 01 ROM 2 01 FLASH FW 2 30 TIMRAW 1 02 UBX 15012993 u blox reserves all rights to this document and the information contai...

Страница 3: ...ence on I O lines 8 2 Design 9 2 1 Pin description 9 2 2 Minimal design 10 2 3 Footprint and paste mask 10 2 4 Antenna and Antenna supervision 11 2 4 1 Antenna design with passive antenna 11 2 4 2 Act...

Страница 4: ...main supply voltage During operation the current drawn by the module can vary by some orders of magnitude especially if enabling low power operation modes For this reason it is important that the sup...

Страница 5: ...X3232 Hardware handshake signals and synchronous operation are not supported 1 4 2 USB A USB version 2 0 FS Full Speed 12 Mb s compatible interface is available for communication as an alternative to...

Страница 6: ...nformation about the DDC implementation see the u blox M8 Receiver Description Including Protocol Specification 3 For bandwidth information see the LEA M8S Data Sheet 1 For timing parameters consult t...

Страница 7: ...he Flash has become corrupted D_SEL Interface select LEA M8T ONLY The D_SEL pin selects the available interfaces SPI cannot be used simultaneously with UART DDC If open UART and DDC are available If p...

Страница 8: ...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 will emit from unshielded I O...

Страница 9: ...pull up resistor to VCC Input pin for optional antenna supervisor circuitry Leave open if not used UART TxD LEA M8S 3 TxD SPI MISO LEA M8T O Serial Port Communication interface can be programmed as TX...

Страница 10: ...A M8T passive antenna design For active antenna design see section 2 4 2 3 Footprint and paste mask Figure 5 describes the footprint and provides recommendations for the paste mask for the LEA M8S and...

Страница 11: ...ntion to the layout of the RF section Typically a passive antenna is located near electronic components therefore care should be taken to reduce electrical noise that may interfere with the antenna pe...

Страница 12: ...Active antenna design Active antennas have an integrated low noise amplifier Active antennas require a power supply that will contribute to the total GNSS system power consumption budget with addition...

Страница 13: ...8T Data Sheet 2 For recommended parts see Appendix In case VCC_RF voltage does not match with the antenna supply voltage use a filtered external supply as shown in Figure 10 Antenna design with active...

Страница 14: ...cuit see Figure 14 High on AADET_N means that an external antenna is not connected Status reporting At startup and on every change of the antenna supervisor configuration the LEA M8S and LEA M8T modul...

Страница 15: ...ceiver Description Including Protocol Specification 3 Short circuits on the antenna input without limitation R_BIAS of the current can result in permanent damage to the receiver Therefore it is mandat...

Страница 16: ...band at 1 561 GHz Therefore it is not recommended to use digital supply nets to feed the V_ANT pin Figure 13 Module design with active antenna external supply for exact pin orientation see the LEA M8S...

Страница 17: ...formation Design Page 17 of 31 RF Vcc Rbias R R R I _ 3 2 2 Equation 1 Calculation of threshold current for open circuit detection If the antenna supply voltage is not derived from VCC_RF do not excee...

Страница 18: ...upply voltage No difference 7 GND Ground digital GND Ground digital No difference 8 VCC_OUT Output voltage VCC_OUT Output voltage No difference 9 NC Not Connected Reserved Not Connected No difference...

Страница 19: ...LO during start up 13 GND Ground GND Ground No difference 14 GND Ground GND Ground No difference 15 GND Ground GND Ground No difference 16 RF_IN GNSS signal input RF_IN GNSS signal input No differenc...

Страница 20: ...the solder 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 ove...

Страница 21: ...oldering the u blox M8 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 created...

Страница 22: ...ixture soldering e g pins 1 and 15 and then continue from left to right Rework The u blox M8 module can be unsoldered from the baseboard using a hot air gun When using a hot air gun for unsoldering th...

Страница 23: ...EMI handling and protection measures To prevent overstress damage at the RF_IN of your receiver never exceed the maximum input power see the LEA M8S Data Sheet 1 and the NEO LEA M8T Data Sheet 2 Elec...

Страница 24: ...asures Using an LNA with appropriate ESD rating can provide enhanced GNSS performance with passive antennas and increases ESD protection Most defects caused by ESD can be prevented by following strict...

Страница 25: ...ce EMI Electromagnetic interference EMI is the addition or coupling of energy causing a spontaneous reset of the GNSS receiver or resulting in unstable performance In addition to EMI degradation due t...

Страница 26: ...filter is needed on the GNSS side to block the high energy emitted by the GSM transmitter Examples of these kinds of filters would be the SAW Filters from Epcos B9444 or B7839 or Murata Increasing int...

Страница 27: ...from the GNSS carrier see Figure 20 The main sources are wireless communication systems such as GSM CDMA WCDMA Wi Fi BT etc 0 500 1000 1500 2000 GPS input filter characteristics 0 110 0 500 1500 2000...

Страница 28: ...ou Low insertion loss LNA JRC NJG1143UA2 LNA Low noise figure up to 15 dBm RF input power Avago ALM GN001 LNA Low noise figure with pre LNA filter concurrent GNSS Avago ALM GN002 LNA Very low noise fi...

Страница 29: ...ant Antenna SAW LNA On chip LNA SAW Passive GNSS 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...

Страница 30: ...S 09007 For regular updates to u blox documentation and to receive product change notifications please register on our homepage http www u blox com Revision history Revision Date Name Status Comments...

Страница 31: ...Phone 65 6734 3811 E mail info_ap u blox com Support support_ap 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 Chin...

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