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ZED-F9K - Integration manual

Figure 46: VCC pads

4.9 Design guidance

4.9.1 General considerations

Check power supply requirements and schematic:

• Is the power supply voltage within the speciﬁed range and noise-free?
• If USB is not used, connect the V_USB pin to ground.
• It is recommended to have a separate LDO for V_USB that is enabled by the module VCC. This is

to comply with the USB self-powered speciﬁcation.

• If USB is used, is there a 1 uF capacitor right near the V_USB pin? This is just for the V_USB pin.
• Is there a 1 uF cap right next to the module VCC pin?
• Compare the peak current consumption of the ZED-F9K GNSS module with the speciﬁcation of

your power supply.

• GNSS receivers require a stable power supply. Avoid series resistance (less than 0.2 Ω) in

your power supply line (the line to VCC) to minimize the voltage ripple on VCC. See the ZED-
F9K

section in the

chapter for more information on the power supply

requirements.

• Allow all I/O to Float/High impedance (High-Z) when VCC is not applied.

4.9.2 Backup battery

Check backup supply requirements and schematic:

• For achieving a minimal time to ﬁrst ﬁx (TTFF) after a power down (warm starts, hot starts),

make sure to connect a backup battery to V_BCKP.

• Verify your battery backup supply can provide the battery backup current speciﬁed in the ZED-

F9K data sheet.

• Allow all I/O including UART and other interfaces to Float/High impedance in HW backup mode

(battery backup connected with VCC removed).

4.9.3 RF front-end circuit options

It is important that the RF input is fed by an active antenna meeting the requirements for
the ZED-F9K.

The ﬁrst stages of the signal processing chain are crucial to the overall receiver performance.

When an RF input connector is employed this can provide a conduction path for harmful or
destructive electrical signals. If this is a likely factor the RF input should be protected accordingly.

UBX-20046189 - R01

4 Design

Page 88 of 105

C1-Public

Early production information

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Содержание ZED-F9K

Страница 1: ...dule provides lane accurate positioning under challenging conditions and decimeter level accuracy for automotive mass markets The ZED F9K module is ideal for ADAS V2X and head up displays It provides...

Страница 2: ...art be subject to intellectual property rights Reproduction use modi cation or disclosure to third parties of this document or any part thereof without the express permission of u blox is strictly pro...

Страница 3: ...ning ADR 15 3 2 1 Introduction 15 3 2 2 Solution type 16 3 2 3 Installation con guration 16 3 2 4 Sensor con guration 19 3 2 5 ADR system con guration 22 3 2 6 Operation 22 3 2 7 Priority navigation m...

Страница 4: ...1 Spoo ng detection monitoring 61 3 10 2 Jamming interference indicator 62 3 10 3 GNSS receiver integrity 63 3 11 u blox protocol feature descriptions 63 3 11 1 Broadcast navigation data 63 3 12 Forci...

Страница 5: ...9 5 Ground pads 90 4 9 6 Schematic design 90 4 9 7 Layout design in guideline 90 5 Product handling 91 5 1 ESD handling precautions 91 5 2 Soldering 91 5 3 Tapes 94 5 4 Reels 95 5 5 Moisture sensitiv...

Страница 6: ...Most of the following sub sections should be familiar to existing users of u blox positioning products however some changes are introduced owing to the new con guration messages The sections from Des...

Страница 7: ...ule provides accurate location services to the increasing number of intelligent electronic control units ECU such as telematics control unit navigation system infotainment and V2x safety systems In pr...

Страница 8: ...time kinematic u blox ZED F9K high precision receiver takes GNSS precision to the next level Delivers accuracy down to the decimeter level Fast time to rst x and robust performance with multi band mu...

Страница 9: ...age elds reference section in the ZED F9K Interface description 2 Con guration interface settings are held in a database consisting of separate con guration items An item is made up of a pair consisti...

Страница 10: ...PI Allow communication to a host CPU operated in slave mode only Default messages activated as in UART1 Input output protocols available as in UART1 SPI is not available unless D_SEL pin is set to low...

Страница 11: ...avigation epoch The rates of the output messages are individually con gurable per communication interface See the CFG MSGOUT con guration group Some messages such as UBX MON VER are non periodic and w...

Страница 12: ...coordinates in the correction source reference frame This may need to be taken into account when using the RTK derived position See the Reference frames section in the Appendix for more information 3...

Страница 13: ...credentials such as user name and password from the service provider The u center NTRIP client then forwards the RTCM 3 3 corrections to a ZED F9K receiver connected to the local u center application...

Страница 14: ...000 30 20 Altitude and velocity Medium Table 6 Dynamic platform model details Applying dynamic platform models designed for high acceleration systems e g airborne 2g can result in a higher standard de...

Страница 15: ...on by multipath The receiver trusts such signals less in order to preserve the quality of the position solution in poor signal environments This feature can result in degraded performance in situation...

Страница 16: ...n order to compensate for the position o set advanced con gurations can be applied Contact u blox support for more information on advanced con gurations 3 2 3 1 IMU mount alignment This section descri...

Страница 17: ...nly if they were initialized see the next section If automatic IMU mount alignment is re activated alignment is pursued by starting from the state where deactivation happened 3 2 3 1 2 User de ned IMU...

Страница 18: ...a single rotation around the installation frame z axis that is with no IMU mount roll and IMU mount pitch rotation CFG SFIMU IMU_MNTALG_PITCH The IMU mount pitch angle pitch corresponds to the rotatio...

Страница 19: ...s UBX ESF MEAS data type 10 shall be used for single tick odometer data and UBX ESF MEAS data type 11 shall be used for speed odometer data See the Interface description for more information By defaul...

Страница 20: ...e the latency of the wheel tick speed data CFG SFODO LATENCY should be given as accurately as possible to within at least 10 ms If not provided the wheel tick speed data latency is assumed zero More d...

Страница 21: ...e sensor measurement generation time is to have the GNSS receiver assume the time of reception of the rst byte of the UBX ESF MEAS message minus the constant con gured latency in CFG SFODO LATENCY to...

Страница 22: ...ags can be encoded in di erent data types signed unsigned varying number of bytes which might vary across sensor types For example if the IMU raw packet s time tag eld is encoded into an unsigned long...

Страница 23: ...lized the status of the IMU initialization imuInitStatus is agged as 1 INITIALIZING in the UBX ESF STATUS message Moreover the required sensor calibration statuses calibStatus are agged as 0 NOT CALIB...

Страница 24: ...to 1 CALIBRATING As soon as the calibration reaches a status where optimal fusion performance can be expected UBX ESF STATUS calibStatus is set to 2 3 CALIBRATED 3 2 6 1 2 1 UDR fallback mode In case...

Страница 25: ...s 2 INITIALIZED the IMU mount alignment status UBX ESF ALG status shows 3 COARSE ALIGNED Wheel tick sensor initialization Drive for at least 500 meters at a minimum speed of 30 km h To shorten this ca...

Страница 26: ...shed angles yaw pitch and roll correspond to the current estimated values but are not yet applied for rotating the IMU observations IMU mount angle initialization complete After initialization the UBX...

Страница 27: ...MU mount pitch misalignment angles either due to a wrong initialization or a change in the physical mounting of the device the UBX ESF ALG error bit 0 is set to 1 IMU mount yaw angle error If the auto...

Страница 28: ...z axis completes the right handed reference system by pointing down 3 2 6 4 3 Vehicle position and velocity output The position and velocity information is output in several messages for example UBX...

Страница 29: ...ut The order of the sequence of rotations around the navigation axes de ning the vehicle attitude matrix in terms of vehicle attitude angles is illustrated below UBX 20046189 R01 3 Receiver functional...

Страница 30: ...information that is directly compensated by the fusion lter This implies that depending on the solution type and the sensor availability dynamics along some axes of the vehicle frame might not be ava...

Страница 31: ...e data eld are accelerometer gyroscope and temperature readings The data types are the same as described in the Sensor Data Types section The measurements are made at a xed rate The sampling rate or o...

Страница 32: ...igh 0 30 Hz Con gurable NMEA Standard VTG Course over ground and ground speed High 0 30 Hz Con gurable NMEA Standard GNS GNSS x data High 0 30 Hz Con gurable NMEA Standard GGA Global positioning syste...

Страница 33: ...3 Geofencing 3 3 1 Introduction Figure 8 Geofence The geofencing feature allows for the con guration of up to four circular areas geofences on the Earth s surface The receiver will then evaluate for e...

Страница 34: ...rements monitor status information and con gure the receiver A protocol e g UBX NMEA can be assigned to several ports simultaneously each con gured with individual settings e g baud rate message rates...

Страница 35: ...be used as a host interface for con guration monitoring and control UART2 is available as an optional stand alone RTCM interface and cannot be used as a host interface The UART RX interface will be d...

Страница 36: ...e load on the I2C lines additional external pull up resistors may be necessary To use the I2C interface D_SEL pin must be left open In designs where the host uses the same I2C bus to communicate with...

Страница 37: ...or write access are clocked onto the bus by the master transmitter The receiver answers with an acknowledge logic low to indicate that it recognizes the address Next the 8 bit address of the register...

Страница 38: ...does not provide any write access except for writing UBX and NMEA messages to the receiver such as con guration or aiding data Therefore the register set mentioned in the section Read access is not w...

Страница 39: ...prevent the receiver from being busy parsing incoming data the parsing process is stopped after 50 subsequent bytes containing 0xFF The parsing process is re enabled with the rst byte not equal to 0x...

Страница 40: ...o a USB host USB suspend mode is not supported USB bus powered mode is not supported It is important to connect V_USB to ground and leave data lines open when the USB interface is not used in an appli...

Страница 41: ...internal pull up resistor Driving RESET_N low for at least 100 ms will trigger a cold start The RESET_N pin will delete all information and trigger a cold start It should only be used as a recovery op...

Страница 42: ...are not in use see UBX MON HW3 in the ZED F9K Interface Description 2 for a list of the PIOs and their mapping Each TX_READY pin is exclusively associated to one port and cannot be shared If PIO is in...

Страница 43: ...dicate whether the vehicle is moving forwards or backwards By default the DIR pin polarity is automatically initialized once the vehicle has reached required minimum speed of 30 km h The DIR pin polar...

Страница 44: ...mode has been achieved Otherwise the pin level is high The RTK_STAT pin status can be mapped to the carrSoln eld of the UBX NAV PVT and interpreted as follows An active low pin level indicates that R...

Страница 45: ...7R 0402 10N 10 16V TYCO 0 25PF PESD0402 140 55 125C ESD protection diode on RF trace Table 17 Recommended components for antenna supervisor 3 6 1 Antenna voltage control ANT_OFF Antenna status as repo...

Страница 46: ...lt GNTXT 01 01 02 ANTSTATUS SHORT 73 ANT_OFF active high therefore still low still enabled as auto power down is not enabled After a detected antenna short the reported antenna status will keep on bei...

Страница 47: ...erefore PIO is high PIO pull up enabled to be pulled low if antenna not detected Start up message at power up if con guration is stored GNTXT 01 01 02 ANTSUPERV AC SD OD PDoS SR 15 GNTXT 01 01 02 ANTS...

Страница 48: ...y improve time to rst x TTFF There are several ways in which a u blox receiver can retain useful data while it is powered down including Battery backed RAM The receiver can be supplied with su cient p...

Страница 49: ...m that contains the receiver can connect to the internet download the data from the AssistNow Online Service and forward it on to the receiver In the simplest case that may involve fetching the data f...

Страница 50: ...tance data being sent and the nature of the communications link e g baud rate of serial link u blox recommends that when customers are developing their host software they start by sending all assistan...

Страница 51: ...String Optional A comma separated list of u blox gnssId svId pairs The ephemeris data returned to the client will only contain data for the listed satellites Table 18 AssistNow Online parameter keys...

Страница 52: ...ked The following outlines the suggested shutdown procedure when using the save on shutdown feature With the UBX CFG RST message the host commands the u blox receiver to stop specifying reset mode 0x0...

Страница 53: ...navigation epoch If the navigation solution attempt is successful one of the results is an accurate measurement of time in the time base of the chosen GNSS system called GNSS system time The di erenc...

Страница 54: ...d to use the iTOW eld for any other purpose The original designers of GPS chose to express time date as an integer week number starting with the rst full week in January 1980 and a time of week often...

Страница 55: ...is normally reported with two decimal places e g 124923 52 Although compatibility mode selected using CFG NMEA COMPAT requires three decimal places rounding to the nearest hundredth of a second remain...

Страница 56: ...time within their data message In most cases this is a time of week often abbreviated to TOW which indicates the elapsed number of seconds since the start of the week midnight Saturday Sunday In order...

Страница 57: ...eek number appropriately when supplying u blox receivers with simulated signals especially when the scenarios are in the past 3 9 10 Time pulse 3 9 10 1 Introduction u blox receivers include a time pu...

Страница 58: ...ample GPS supports a variant of UTC as de ned by the US National Observatory while BeiDou uses UTC from the National Time Service Center China NTSC While the di erent UTC variants are normally closely...

Страница 59: ...s frequency or period length ratio type Determines whether the time pulse length is interpreted as length us or pulse ratio antenna cable delay Signal delay due to the cable between the antenna and th...

Страница 60: ...can be used to provide an accurate measurement of the time at which a pulse was detected on the external interrupt pin The reference time can be chosen by setting the time source parameter to UTC GPS...

Страница 61: ...about possible threads and which functionality is available to detect and or mitigate it Threat u blox solution Over air signal integrity Spoo ng detection mitigation Jamming detection mitigation GNSS...

Страница 62: ...broadband interference monitoring The eld flags of the UBX MON RF message can be used as an indicator for both broadband and continuous wave CW jammers interference It is independent of the CW only ja...

Страница 63: ...tion layer For more information on the con guration layers including the order of priority they are applied in see the ZED F9K Interface description 2 The con guration lockdown set on a con guration l...

Страница 64: ...X RXM SFRBX messages are only generated when complete subframes are detected by the receiver and all appropriate parity checks have passed Where the parity checking algorithm requires data to be inver...

Страница 65: ...the idle chip which should always have a value of zero The meaning of other bits varies with string and frame number The fourth and nal 32 bit word in the UBX RXM SFRBX message contains frame and sup...

Страница 66: ...BeiDou ICD Each subframe comprises ten data words which are reported in the same order they are received Each word is arranged as follows Figure 27 BeiDou subframe word Note that as the BeiDou data wo...

Страница 67: ...ns a pair of I NAV pages as described in the Galileo ICD Galileo pages can either be Nominal or Alert pages For Galileo Nominal pages the eight words are arranged as follows Figure 28 Galileo E1 B sub...

Страница 68: ...ted by the Galileo ICD 3 11 1 5 2 Galileo E5b For the Galileo E5b in phase signal data component each reported subframe contains a pair of I NAV pages as described in the Galileo ICD Galileo pages can...

Страница 69: ...S For SBAS L1C A signals each reported subframe contains eight 32 bit data words to deliver the 250 bits transmitted in each SBAS data block The eight words are arranged as follows UBX 20046189 R01 3...

Страница 70: ...RXM SFRBX message GNSS Signal gnssId sigId numWords period GPS L1C A 0 0 10 6s SBAS L1C A 1 0 8 1s GPS L2CL 0 3 10 12s GPS L2CM 0 4 10 12s Galileo E1 C 2 0 8 2s Galileo E1 B 2 1 8 2s Galileo E5 bl 2 5...

Страница 71: ...od Using the UBX CFG RST message you can force the receiver to reset and clear data in order to see the e ects of maintaining losing such data between restarts For this the UBX CFG RST message o ers t...

Страница 72: ...d in Table 23 The ZED F9K is an LGA package with the I O on the outside edge and central ground pads Figure 31 ZED F9K pin assignment Pin no Name I O Description 1 GND Ground 2 RF_IN I RF input 3 GND...

Страница 73: ...und 33 VCC I Voltage supply 34 VCC I Voltage supply 35 Reserved Reserved 36 V_BCKP I Backup supply voltage 37 GND Ground 38 V_USB I USB power input 39 USB_DM I O USB data 40 USB_DP I O USB data 41 GND...

Страница 74: ...he ZED F9K module the equipment must be supplied by an external limited power source in compliance with the clause 2 5 of the standard IEC 60950 1 4 2 2 V_BCKP Backup supply voltage The V_BCKP pin can...

Страница 75: ...quires a low noise low dropout voltage and a very low source impedance power supply of 3 3 V typically No inductors or ferrite beads should be used from LDO to the module VCC pin The peak currents nee...

Страница 76: ...ttery to V_BCKP If USB is not used connect V_USB to ground Ensure an optimal ground connection to all ground pins of the ZED F9K GNSS module If antenna bias is required see ZED F9K antenna bias sectio...

Страница 77: ...IODE FAIRCHILD BZX84 SOT23 6V2 0 2A D2 VOLTAGE REGULATOR DIODE FAIRCHILD BZX84 SOT23 6V2 0 2A O1 OPTOCOUPLER LVTTL LVCMOS COMPATIBLE AVAGO HCPL 070L 000E SO8 O2 OPTOCOUPLER LVTTL LVCMOS COMPATIBLE AVA...

Страница 78: ...dB L1 band antenna gain 4 1559 1606 MHz 3 dBic typ L2 E5b band antenna gain 4 1197 1249 MHz 2 dBic typ Polarization RHCP Axial ratio 2 dB max at Zenith Phase center variation 10 mm over elevation azim...

Страница 79: ...s t inductor must be chosen for multi band operation a value of 47 nH 5 is recommended for the recommended Murata L part It has a self resonance frequency of 1 GHz and a high impedance 500 at L band f...

Страница 80: ...e important points covered below need to be taken into account Figure 38 ZED F9K VCC_RF antenna bias The bias t inductor and current limiting resistor must be selected to be reliable with a short circ...

Страница 81: ...tegrating GNSS receivers into wireless systems careful consideration must be given to electromagnetic and voltage susceptibility issues Wireless systems include components which can produce Electrosta...

Страница 82: ...ce with the clause 2 5 of the standard IEC 60950 1 In addition to external limited power source only Separated or Safety Extra Low Voltage SELV circuits are to be connected to the module including int...

Страница 83: ...at levels much higher than the GNSS signal itself One reason is that the frequency band above 1 GHz is not well regulated with regards to EMI and even if permitted signal levels are much higher than...

Страница 84: ...e receiver chain including the antenna itself When de ning a GNSS receiver layout the placement of the antenna with respect to the receiver as well as grounding shielding and interference from other d...

Страница 85: ...packages are provided in this section These are recommendations only and not speci cations The exact copper solder and paste mask geometries distances stencil thickness and solder paste volumes must...

Страница 86: ...ial with a dielectric permittivity of for example 4 7 the trace width for the 50 line impedance can be calculated A grounded co planar RF trace is recommended as it provides the maximum shielding from...

Страница 87: ...round layer ll on the top layer of the PCB is recommended This is shown in the gure below Figure 45 Top layer ll and vias 4 8 4 3 VCC pads The VCC pads for the ZED F9K high precision receiver must hav...

Страница 88: ...apter for more information on the power supply requirements Allow all I O to Float High impedance High Z when VCC is not applied 4 9 2 Backup battery Check backup supply requirements and schematic For...

Страница 89: ...red to the GNSS receiver board In such cases use of external protection in front of RF_IN is mandatory to avoid device destruction ESD discharge cannot be avoided during assembly and or eld use Note t...

Страница 90: ...pplication connect a backup battery to V_BCKP Antenna bias is required see ZED F9K antenna bias section 4 9 7 Layout design in guideline Is the receiver placed away from heat sources Is the receiver p...

Страница 91: ...touched in non ESD protected work area implement proper ESD protection measures in the design When soldering RF connectors and patch antennas to the receiver s RF pin make sure to use an ESD safe sold...

Страница 92: ...ove the liquidus temperature of 217 C Avoid a sudden rise in temperature as the slump of the paste could become worse Limit time above 217 C liquidus temperature 40 60 s Peak re ow temperature 245 C C...

Страница 93: ...upright re ow cycle A module placed on the underside of the board may detach during a re ow soldering cycle due to lack of adhesion The module can also tolerate an additional re ow cycle for re work p...

Страница 94: ...ltrasonic processes Some components on the module are sensitive to ultrasonic waves Use of any ultrasonic processes cleaning welding etc may cause damage to the GNSS receiver u blox o ers no warranty...

Страница 95: ...isture sensitivity levels The moisture sensitivity level MSL for ZED F9K is speci ed in the table below Package MSL level LGA 4 Table 26 MSL level For MSL standard see IPC JEDEC J STD 020 which can be...

Страница 96: ...tellite system GPS Global Positioning System GSM Global System for Mobile Communications I2C Inter integrated circuit bus IEC International Electrotechnical Commission IMU Inertial measurement unit IR...

Страница 97: ...rrestrial Reference Frame ETRF ITRF is a realization of ITRS done every few years Latest realizations of ITRF are ITRF2008 and ITRF2014 ETRF is a realization of ETRS89 done every few years Latest real...

Страница 98: ...oup CFG UART1 Key name CFG UART1 BAUDRATE See Figure 50 Figure 50 u center UBX CFG VALSET message view 2 Select Add to List it will appear in the table below UBX 20046189 R01 Appendix Page 98 of 105 C...

Страница 99: ...the current value See Figure 51 Figure 51 Example u center UBX CFG VALSET message view when selecting a con guration item 4 Add the value for example 230400 into the Value window that appears below th...

Страница 100: ...ALSET message view for setting the CFG UART1 BAUDRATE con guration item that controls the baudrate of UART1 Next some UBX example messages are con gured to enable viewing the receiver status 1 Select...

Страница 101: ...ms for enabling the output of some recommended UBX messages 4 To ensure all the required RTCM messages including most importantly RTCM 1005 are being received regularly examine the UBX RXM RTCM output...

Страница 102: ...ixed mode See Figure 55 Figure 55 u center data view with RTK Fixed UBX NAV SOL is shown however it is no longer supported on this platform If using a virtual reference service the receiver must be co...

Страница 103: ...20046191 3 Packaging information for u blox chips modules and antennas UBX 14001652 For regular updates to u blox documentation and to receive product change noti cations please register on our homep...

Страница 104: ...ion manual Revision history Revision Date Name Status comments R01 06 Nov 2020 ssid Early production information ZED F9K 00B 01 UBX 20046189 R01 Revision history Page 104 of 105 C1 Public Early produc...

Страница 105: ...il info_cn u blox com Support support_cn u blox com Regional O ce China Chongqing Phone 86 23 6815 1588 E mail info_cn u blox com Support support_cn u blox com Regional O ce China Shanghai Phone 86 21...

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