GPS low power receiver GNS601uLP Datasheet preliminary specification 1 INTRODUCTION GNS introduces a new series of complete GPS receivers that are optimized for very small battery budgets. Thanks to advanced dynamic power management technology, the power consumption is reduced to a minimum below 7 mA (<20mW). Average power savings are 60%. Unlike other concepts that use trickle operation modes with reduced update rates of the position, GNS601uLP works at full 1 per second position update rate. Best power savings can be achieved in typical outdoor scenarios with wide view angles to the sky. GNS601uLP allows long term tracking in small applications like fitness wearables, pet tracking and camera applications. Very low power requirements and internal voltage regulator makes it easy to run the receiver with various power supplies and allows direct connection to LiIon batteries. GNS601uLP utilizes a patch antenna (15 by 15 mm) to realize high sensitivity and optimum radiation pattern. If space is a main requirement, GNS also offers a chip antenna version (GNS302uLP). The navigation performance and accuracy is improved by using correction data from SBAS (WAAS, EGNOS, GAGAN, MSAS), QZSS. First Fixes after just a few seconds are achieved with the help of A-GPS using EPOTM (Extended Prediction Orbit) and the EASYTM self generated orbit prediction algorithm. EASYTM (Embedded Assist System) does not require any resources from the host and no data from the network. AlwaysLocateTM power management feature can be activated to further lower the power requirements at lower update rates. It adaptively adjusts power consumption depending on the environment and motion conditions, in order to achive a balance between fix rate, power consumption and position accuracy. V 1.3, Feb 17th 2016 1 GPS low power receiver GNS601uLP Datasheet preliminary specification GNS601uLP offers the industry's highest level of navigation sensitivity up to -165dBm1. It has superior dynamic performance at high velocity and provides effective protection against interference signals using MTAICTM (Multi-tone active interference canceller). Up to 12 independent channel interference continious wave jammers <-80dBm can be eliminated or reduced. The embedded logger function LOCUS with a 16-hrs (8000 samples) on chip memory makes this GPS module a complete track logger for many applications. In professional timing applications the outstanding high accuracy PPS (pulse per second) hardware pin is used for synchronization to GPS second. Typical accuracy is 10ns RMS. Features 1 Ultra low power technology at full tracking output rate 66 acquisition-/ 22 tracking channels Ultra high tracking/navigation sensitivity: -165dBm1 tuned ceramic patch antenna SBAS (WAAS,EGNOS,MSAS,GAGAN, QZSS) correction support A-GPS by EPO "Extended Prediction Orbit" TM enables 7/14days prediction 12 Multitone Active Interference Canceller (MTAIC) for GPS-in-band jammer rejection EASY TM : Self generated orbit prediction support AlwaysLocate TM : Intelligent Algorithm for power saving High accuracy 1PPS output NMEA-0183 or binary protocol High update rate (up to 10/s) Embedded logger function with 16hrs internal memory GPS current consumption (@3.3V): Acquisition: 20mA typical Tracking: 6mA typical Low backup current consumption 7uA, typical SMD type , manual soldering also possible Small form factor: 16x16x6.7mm CE and RohS certified Note: Measured navigation sensitivity at RF input of chipset V 1.3, Feb 17th 2016 2 GPS low power receiver GNS601uLP Datasheet preliminary specification 2 INDEX 1 INTRODUCTION ----------------------------------------------------------------------------------------- 1 2 INDEX --------------------------------------------------------------------------------------------------- 3 3 FUNCTIONAL DESCRIPTION ---------------------------------------------------------------------------- 4 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 System description ---------------------------------------------------------------------------------------------------------4 Block diagram --------------------------------------------------------------------------------------------------------------4 AGPS with EPO data --------------------------------------------------------------------------------------------------------5 Power Management Features ----------------------------------------------------------------------------------------------6 EASYTM self generated prediction data feature ----------------------------------------------------------------------------8 Pulse Per Second (PPS) ----------------------------------------------------------------------------------------------------8 Logger function -------------------------------------------------------------------------------------------------------------9 Active interference cancellation (MTAIC) ---------------------------------------------------------------------------------9 SBAS (Satellite Based Augmentation) support ---------------------------------------------------------------------------9 GPS almanac and ephemeris data--------------------------------------------------------------------------------------- 10 Real time clock (RTC) ---------------------------------------------------------------------------------------------------- 10 UART interface ------------------------------------------------------------------------------------------------------------ 10 Module default settings -------------------------------------------------------------------------------------------------- 11 4.1 Typical System Overview ------------------------------------------------------------------------------------------------ 11 5.1 GPS characteristics ------------------------------------------------------------------------------------------------------- 12 6.1 PCB LAYOUT GUIDELINES ----------------------------------------------------------------------------------------------- 13 7.1 7.2 Absolute Maximum Ratings ---------------------------------------------------------------------------------------------- 14 Recommended Operating Conditions ----------------------------------------------------------------------------------- 14 11.1 11.2 NMEA output sentences -------------------------------------------------------------------------------------------------- 18 NMEA command interface------------------------------------------------------------------------------------------------ 18 4 TYPICAL APPLICATION BLOCK DIAGRAM ------------------------------------------------------------ 11 5 GPS characteristics ----------------------------------------------------------------------------------- 12 6 DESIGN GUIDELINES --------------------------------------------------------------------------------- 13 7 ELECTRICAL SPECIFICATION ------------------------------------------------------------------------- 14 8 PIN CONFIGURATION --------------------------------------------------------------------------------9 PHYSICAL DIMENSIONS -----------------------------------------------------------------------------10 RECOMMENDED PAD LAYOUT ----------------------------------------------------------------------11 NMEA DATA interface -------------------------------------------------------------------------------12 13 14 15 16 17 18 19 MATERIAL INFORMATION --------------------------------------------------------------------------RECOMMENDED SOLDERING REFLOW PROFILE --------------------------------------------------TAPE&REEL INFORMATION -------------------------------------------------------------------------ORDERING INFORMATION -------------------------------------------------------------------------ENVIRONMENTAL INFORMATION ------------------------------------------------------------------MOISTURE SENSITIVITY ---------------------------------------------------------------------------DOCUMENT REVISION HISTORY -------------------------------------------------------------------RELATED DOCUMENTS ------------------------------------------------------------------------------ V 1.3, Feb 17th 2016 15 16 17 18 19 19 20 21 22 22 22 22 3 GPS low power receiver GNS601uLP Datasheet preliminary specification 3 FUNCTIONAL DESCRIPTION 3.1 System description The GNS601uLP is a high performance, low power GPS receiver that includes an integrated RF frontend (SAW Filter + LNA) and a finely tuned 15x15x4mm ceramic patch antenna. Due to high input sensitivity and integrated low noise amplifier (LNA), it can work at very weak GPS signals. GNS601uLP is a complete autonomous GPS receiver, including: - Full GPS processing, without any host processing requirements Standard NMEA message output A powerful NMEA command and control interface All clock sources integrated RF frontend integrates a low noise amplifier (LNA) and a SAW filter Interface for UART, PPS output pin, Fix Status Indicator pin 3.2 Block diagram GPS patch antenna 5 3D-Fix 6 1PPS SAW filter +Low Noise Amplifier VCC 1 VBACKUP 4 9 UART TX 10 UART RX GPS chip Resistor 32.768kHz crystal 26MHz TCXO GND 3,8,11,12,13 V 1.3, Feb 17th 2016 4 GPS low power receiver GNS601uLP Datasheet preliminary specification 3.3 AGPS with EPO data AGPS (assisted GPS) allows to shorten TTFF (TimeToFirstFix) by injecting ephemeris data from an external source into the module's memory. With the help of these data, the module does not need to acquire satellite positions by receiving the data from the satellites. Depending on time and position information, that is still available in the module memory, the TTFF can be reduced to just a few seconds. The GNS AGPS service is based on a short term predicted data service. The predicted data will be fully processed by the GPS engine. The host must load the data from the web and transfer them over the UART into the module: 1. Check GNS601uLP module EPO (Extended Prediction Orbit) data for validity by comparing the time. 2. Connect to web server through network connection (GPRS, WLAN, LAN,..). 3. Download file. There are just two files, covering all GPS satellites. The first file (MTK7d.EPO) is for 7 days (53kB), the other is 106Kbytes for 14 days (MTK14d.EPO) 4. "Parse" file, using software example. This is quite easy, there must be added some header bytes and a checksum and a control counter. GNS offers software support on this. 5. Download to GNS601uLP receiver. Please refer to the NMEAcommandInterface manual for details. If the host has low memory available, there's no need to save the whole file. The steps 3..5 can be done frame by frame needing less than 2kBytes of buffer memory. Code samples and support for several platforms are available from GNS (in preparation). Thanks to the predicted system, download data stay valid for up to 14 days. Therefore, users can initiate the download everytime and benefit from using (W)LAN instead of using expensive GSM. File size will be ~50kBytes for a one week prediction data set. AGPS characteristics System File size for data download Maximum prediction time TTFF TTFF 7 53 14 1 15 kB days sec sec predicted data 1 week prediction data Time and last position available Last position available V 1.3, Feb 17th 2016 5 GPS low power receiver GNS601uLP Datasheet preliminary specification 3.4 Power Management Features GNS601uLP uses an advanced hardware / firmware architecture to minimize power consumption at full navigation update rate of 1position per second. Best savings are possible with 6 SVs in track and good fieldstrength. uLP feature is a dynamic power management that allows to reduce the power consumption to ~40% in average. Thanks to advanced hardware and firmware architecture and unlike other power management features, uLP feature will calculate and output position data every second. uLP feature has been developed for fitness- and other wearable applications. The average accuracy will be slightly reduced (4m instead of 3m). For static or slow moving scenarios , the savings can be better than 70%. uLP feature is activated by default and can be deactivated through $PMTK262,0 command. Besides of the uLP power mode, the well known power savings modes with reduced output rate and performance are available when uLP is disabled. Power management schemes implemented for any GPS system requires an optimally tuned performance for both accuracy of the position fixes and the average power consumed for best user experience. GNS601uLP architecture achieves these both aspects by providing flexibility and design choices for the system integration, based on wide range of use cases and by leveraging on the proven silicon methodologies. Also GNS601uLP provides position, velocity and time measurements without any host loading. This, coupled with the optional built-in power management options, reduces the overall system power budget. Selectable Power management features: LP feature is a dynamic power management that allows to reduce the power consumption to ~40% in average. Unlike other power management features, LP feature will calculate and output position data every second. LP feature has been developed for fitness- and other wearable applications. The average accuracy will be slightly reduced (4m instead of 3m). For static or slow moving scenarios , the savings can be better than 70%. LP feature is activated by default and can be deactivated by $PMTK262,0 command. In Standby mode RF frontend and internal MPU are switched to deep sleep state. Power consumption is reduced.This state can be entered by sending the NMEA command: $PMTK161,0*28<CR><LF>. Leaving standby mode and resuming to normal operation will be managed by sending any byte to the module. V 1.3, Feb 17th 2016 6 GPS low power receiver GNS601uLP Datasheet preliminary specification Backup mode can be entered by sending NMEA command: $PMTK225,4*2F<CR><LF>. The GPS core will shut down autonomously to backup state, Vcc supply can now be switched off by an external power supply switch. Periodic mode describes a power mode, which will autonomously power on/off the module in programmable time slots with reduced fix rate. Periodic mode is useful during stationary operation or if position fixes are just needed from time to time. Since power consumption in GPS off times is nearly zero, the power consumption in periodic mode can be estimated by Ptracking * (ton/(ton+toff)). Periodic mode is controlled with NMEA command $PTMK225. See document NMEAcommandInterface manual for programming details. AlwaysLocateTM feature provides an optimized overall GPS system power consumption in tracking mode under open sky conditions. Always Locate is an intelligent control of periodic mode. Depending on the environment and motion conditions, GNS601uLP can adjust the on/off time to achieve balance of positioning accuracy and power consumption. The best power saving will be made under good reception in stationary mode. Critical reception conditions and dynamic movements will need full activity of the GPS engine which causes nominal power requirements (20mA typ in tracking mode). V 1.3, Feb 17th 2016 7 GPS low power receiver GNS601uLP Datasheet preliminary specification 3.5 EASYTM self generated prediction data feature GNS601uLP includes an internal prediction system, that allows to sample satellite orbit data during operation and use that data to speed up TTFF on later starts.The prediction time frame is up to three days forward. Although this prediction feature does not provide the very short TTFF that is achieved using AGPS, it can help to find a fix solution faster and in weak signal condition scenario. Prediction data will be kept in memory as long as VBACKUP is present. This option is activated by default. Note: The EASY functionality is only supported, if "VBACKUP" pin is conntected and the NMEA update rate is 1Hz. 3.6 Pulse Per Second (PPS) GNS601uLP provides a Pulse Per Second (PPS) hardware output pin for timing purposes. After calculation of a 3D position fix (default setting), the PPS signal is accurately aligned to the GPS second boundaries. The pulse generated is approximately 100 milliseconds in duration and the repetition rate is 1 second. On request PPS output can activated on a 2D- fix or after power-up of the module, providing a time accuracy decreased PPS signal. T2 T1 T1 = 100ms T2 = 1sec GNS601uLP module provides an exceptionally low RMS jitter of typical 10 nanoseconds. V 1.3, Feb 17th 2016 8 GPS low power receiver GNS601uLP Datasheet preliminary specification 1PPS pulse duration 1PPS time jitter - PPS characteristics based upon a 3D-fix 100 msec 1PPS rise and fall time 10 nsec RMS 5 nsec Pulse rising edge deviation from expected pulse time, measured with full 3D fix 10%..90%, load is 10k||5pF 3.7 Logger function GNS601uLP provides an autonomous logger function that automatically stores position information in an internal 128kB flash memory. A complete tracking unit can be realized without any external CPU or memory. The parameters for logging are programmable via the NMEA command interface. The following parameter can be set to optimize logging time: - logger rate The commands for logger include: - start logging - stop logging - erase memory - readout memory please refer to the NMEAcommandInterface manual for details. Logger data rate Logger data memory Logger trigger 1/15 Internal Logger Function 1 1/s 128 kBytes programm able Flash memory Logger can be triggered on various events 3.8 Active interference cancellation (MTAIC) Because different wireless technologies like Wi-Fi, GSM/GPRS, 3G/4G, Bluetooth are integrated into portable systems, the harmonic of RF signals may influence the GPS reception. The multi-tone active interference canceller can reject external RF interference which come from other active components on the main board, thus improving the performance of GPS reception. GNS601uLP can cancel up to 12 independent continuous wave (CW) channels having signal levels of up to -80dBm. The functionality is enabled by default and increases power consumption by about 1mA. 3.9 SBAS (Satellite Based Augmentation) support GNS601uLP supports Satellite Based Augmentation for improvement of the navigation precision. Correction data is sent from geostationary satellites to the GPS receiver. GNS601uLP supports European, US, and Asian augmentation systems (EGNOS, WAAS, GAGAN, MSAS, QZSS) to enable precision improvements in nearly every region of the world. SBAS is active by default and will automatically track the available SBAS satellites. It can be disabled by NMEA command. See document NMEAcommandInterface manual for details. Note: SBAS is deactivated in uLP mode. For SBAS activation, uLP mode must be disabled V 1.3, Feb 17th 2016 9 GPS low power receiver GNS601uLP Datasheet preliminary specification 3.10 GPS almanac and ephemeris data For quick re-acquisition of the GPS after off-times, the GPS engine should have access to almanac and ephemeris data. This data is permanently stored inside GNS601uLP module, even if all power supplies have been removed. When the GPS is powered-up again, the data will be used to allow a quick re-acquisition, as soon as a coarse time information is available. Time will be available immediately, when RTC is kept running. 3.11 Real time clock (RTC) GNS601uLP has a real time clock with 32,768Hz crystal onboard. As long as VBACKUP is connected to a power source, the real time clock and the module memory can be kept alive at very low power consumption of just 7uA. The RTC will track the current time and enable the module to start from sleep states with very fast time to first Fix (TTFF). 3.12 UART interface GNS601uLP core and I/O sections work at 3.3V nominal. Absolute Maximum Ratings should not be exceeded. Should the GNS601uLP be interfaced to a host with I/O at higher/lower levels, level shifters should be used. UART baud rate is 9600 baud by default. The baud rate can be modified to higher rates by a NMEA software command. See document NMEAcommandInterface manual for details. GPS UART Default Settings Parameter Value Baud rate Data length Stop bit Parity 9600 8 bits 1 None V 1.3, Feb 17th 2016 10 GPS low power receiver GNS601uLP Datasheet preliminary specification 3.13 Module default settings The GNS601ULP receiver comes with default settings, which are persistently programmed. Whenever power is removed from the module (both VCC and VBACKUP), the settings will be reset to the values shown in the following table. NMEA output sentences Setting Default value UART setting Fix frequency (update rate) NMEA sentences NMEA rate Self survey prediction mode: EASYTM Active interference cancellation:MTAIC Datum Logging parameters Low Power Feature 9600,8,N,1 1/sec $GPRMC,$GPGSA,$GPGSV,$GPGGA Once a second enabled enabled WGS 84 Full&Stop / Content Basic / Interval 15 sec Activated (disabled on request) On request, other options can be selected as preprogrammed (persistent default) options. Please contact the GNS support for your project requirements. Note : Customized options are solely available for fixed order lots. 4 TYPICAL APPLICATION BLOCK DIAGRAM 4.1 Typical System Overview Power Management VCC V Backup 2.8 to 4.3V GNS 601uLP UART RX UART TX Host Processor MMI (keys, display) V 1.3, Feb 17th 2016 11 GPS low power receiver GNS601uLP Datasheet preliminary specification 5 GPS characteristics 5.1 GPS characteristics Parameter Min Typ Max Unit Note general Frequency SBAS Datum AGPS Output data frequency Navigation&tracking sensitivity1 Acquisition sensitivity1 Reacquisition sensitivity1 TTFF hotstart TTFF autonomous warm start TTFF autonomous warm start TTFF autonomous cold start Reacquisition time Number of channels tracking Number of acquisition channels Dimension Weight 1575.42 7 1/10 MHz 14 10 1 -165 -148 -163 1 34 5..10 35 <1 22 66 16x16x6.7 6 Power consumption GPS ACTIVE (acquisition) GPS ACTIVE (tracking) GPS ACTIVE (tracking in uLP mode) Backup current @ 3V days 1/sec dBm dBm dBm sec sec sec sec sec mm g 21 mA 20 mA 6 mA 7 uA GPS L1 C/A code WAAS,EGNOS,MSAS,GAGAN,QZSS Not available in uLP mode WGS84 Configurable autonomous Cold start Hot start 6 SVs @-130dBm 6 SVs @-130dBm 6 SVs @-130dBm / with EASY on 6 SVs @-130dBm 6 SVs @-130dBm Tolerance is 0.2 mm NMEA frequency = 1/sec, 3.3V; SBAS enabled;MTIAC enabled NMEA frequency = 1/sec, 3.3V; SBAS enabled;MTIAC enabled uLP mode activated, 6 SVs in solution Accuracy Position error (50%CEP) Position error (50%CEP) Velocity error velocity error Operation altitude Operation velocity Operation acceleration 1 - 4 2.5 0.1 0.05 - - - ITAR limits 18,000 515 4 m m m/s m/s 2D-RMS Using (SBAS) , uLP mode disabled Using (SBAS) , uLP mode disabled m m/s G note: based on chip specifications V 1.3, Feb 17th 2016 12 GPS low power receiver GNS601uLP Datasheet preliminary specification 6 DESIGN GUIDELINES Although GNS601uLP GPS receiver provides best performance at low power consumption, special care should be taken to provide clean signal and clean power supplies. Power lines should be blocked near to the receiver with low ESR capacitors. Radiated noise from neighbour components may also reduce the performance of the receiver. Plastic enclosures can have impact on the antenna center frequency. Avoid that the antenna is in touch with any enclosure parts. A space of ~2mm should be kept clear between antenna and enclosure. Product testing should be performed with the PCB already mounted in the final enclosure. 6.1 PCB LAYOUT GUIDELINES GNS601uLP uses a high performance chip antenna design. For optimum performance, a ground plane area is needed on the main board. This area should be at least 20 x 20mm, a larger ground is recommended. The ground plane can be part of the main ground layer of the mainboard, some (small) components in the neighbourhood are acceptable. Do not place any bulky or metallic components near the antenna (in a distance below 30mm) to avoid unwanted electromagnetic shielding effects. It's recommended to place GNS601uLP near the rim of the main PCB, so that the antenna has a wide unobstructed working angle. The marked clearance area around the antenna pin must be kept clear! It is recommended to place a 3mm hole to ensure proper mechanical flat placement of the module. See chapter 10 for hole location. If possible, do not place any signal tracks below the module. Place multiple vias from Top-GND layer to bottom (or other) GND layer(s) as shown in the example. All ground pads of the module should be releliably soldered. General rules for good and low noise design should be followed: Use a solid ground plane. Keep noisy components (C, switch mode supplies) as far as possible away from sensitive antenna inputs Place decoupling capacitors near to the source of noise and provide a short and low induction connection to ground (use multi-vias if needed) EMC filters or noise filtering coils or beads can help to reduce the noise level further. Select system clocks in a way, that no harmonics will match the GPS frequency of 1575.42 MHz V 1.3, Feb 17th 2016 13 GPS low power receiver GNS601uLP Datasheet preliminary specification 7 ELECTRICAL SPECIFICATION 7.1 Absolute Maximum Ratings Parameter Supply voltage range: Vcc Backup voltage: VBACKUP Value Unit 2.8 to 4.3 2 to 4.3 V V 7.2 Recommended Operating Conditions Parameter Min Typ Max Unit Vcc Vcc ripple voltage 3.2 3.3 4.2 V 50 VBACKUP 2.2 3.0 4.2 V RX0 TTL H Level RX0 TTL L Level TX0 TTL H Level TX0 TTL L Level 2.0 0 2.4 0 Vcc 0.8 2.8 0.4 V V V V Storage temperature -50 90 C Operating temperature -40 85 C Note supply voltage mVpp Backup voltage for RTC and memory retention, must be available during normal operation Condition: VCC=3.0V~4.3V Condition: VCC=3.0V~4.3V Condition: VCC=3.0V~4.3V Condition: VCC=3.0V~4.3V V 1.3, Feb 17th 2016 14 GPS low power receiver GNS601uLP Datasheet preliminary specification 8 PIN CONFIGURATION Top View Pin 1 Name VCC I/O P Description & Note Main DC power input The main DC power supply for the module. The voltage should be kept between from 3.2V to 5.0V. The ripple must be limited under 50mVpp (Typical: 3.3V). 2 3 4 5 NC GND VBACKUP P P Not connected Ground . Backup power input for RTC & navigation data keep 3D_FIX O 3D-Fix Indicator This connects to the backup power of the GPS module. Power source (such as battery) connected to this pin will help the GPS chipset in keeping its internal RTC running when the main power source is turned off. The voltage should be kept between 2.0V~4.3V, Typical 3.0V. If VBACKUP power was not reserved, the GPS module will perform a lengthy cold start every time it is poweredon because previous satellite information is not retained and needs to be re-transmitted. This pin must be connected for normal operation. The 3D_FIX is assigned as a fix flag output. If not used, keep floating. Before 2D Fix The pin will continuously toggle with 1Hz. output one second high-level and one-second low-level signal After 2D or 3D Fix The pin will continuously output low-level signal. This pin may not connected to high-level at power-on sequence. 6 1PPS O 1PPS Time Mark Output 2.8V CMOS Level This pin provides one pulse-per-second output from the module and synchronizes to GPS time. Keep floating if not used. 7 8 9 NC GND TX P O Not connected Ground . Serial Data Output A for NMEA output (TTL) 10 RX I Serial Data Input A for Firmware update (TTL) 11 12 13 GND GND GND P P P Ground . Ground . Ground . This is the UART transmitter of the module. It outputs GPS information for application. This is the UART receiver of the module. It is used to receive commands from system. (1) I = INPUT; O = OUTPUT; I/O = BIDIRECTIONAL; P = POWER PIN; ANA = ANALOG PIN. V 1.3, Feb 17th 2016 15 GPS low power receiver GNS601uLP Datasheet preliminary specification 9 PHYSICAL DIMENSIONS TOP VIEW all units in mm, tolerance is 0.2mm V 1.3, Feb 17th 2016 16 GPS low power receiver GNS601uLP Datasheet preliminary specification 10 RECOMMENDED PAD LAYOUT all units in mm Footprint Top View V 1.3, Feb 17th 2016 17 GPS low power receiver GNS601uLP Datasheet preliminary specification 11 NMEA DATA interface GNS601uLP provides NMEA (National Marine Electronics Association) 0183 compatible data. A set of proprietary NMEA commands are available to send control messages to the receiver. These commands are described in a separate document: NMEAcommandInterface manual. For standard operation, no commands are needed; the module will start outputting NMEA sentences after power supply has been attached If non standard options are needed they can be programmed from host controller during runtime. Important note : Options set by using NMEA command interface are not persistent! They will be lost when power is removed. A backup supply at VBACKUP will be sufficient to keep them. 11.1 NMEA output sentences NMEA output sentences Type content $GPRMC $GPGGA $GPGSA $GPGLL $GPGSV Common GPS sentences Recommended Minimum Navigation Information Fix Data, Time, Position and fix related data for a GPS receiver DOP and active satellites Geographic Position - Latitude/Longitude GPS Satellites in view 11.2 NMEA command interface GNS601uLP NMEA command interface allows to control settings and the extended functions. The command interface specification is available in an extra document: NMEAcommandInterface manual. Two groups of commands are available: Setting commands do modify the behavior of the module. Note : Modified settings will be valid as long as the module is powered through VCC or VBACKUP. (f.e. : setting of a new baud rate). After removing VCC and VBACKUP, all settings are reset to their default values. Action commands will perform the specified action one time after the command has been received. (f.e. : request for cold start) Commands are always started with $PTMK, directly followed by the command number 000..999. Each command must be terminated by *<chksum>and a <CR><LF>. The checksum calculation is simple, just XOR all the bytes between the $ and the * (not including the delimiters themselves). Then use the hexadecimal ASCII format. V 1.3, Feb 17th 2016 18 GPS low power receiver GNS601uLP Datasheet preliminary specification 12 MATERIAL INFORMATION Complies to ROHS standard ROHS documentations are available on request Contact surface: gold over nickel 13 RECOMMENDED SOLDERING REFLOW PROFILE T[C] 300 250C max 250C for 10 sec max 230C for 40 sec max 200 160C 190C 120 sec reflow solder 100 100 200 t[sec] Notes: 1. GNS601uLP should be soldered in upright soldering position. In case of head-over soldering, please prevent shielding / GNS601uLP receiver from falling down. 2. Do never exceed maximum peak temperature 3. Reflow cycles allowed : 1 time 5. This device is not applicable for flow solder processing 6. This device is applicable for solder iron process. Use solder iron at or below 350C, soldering time < 3 sec, pause between two solder points 3 sec. V 1.3, Feb 17th 2016 19 GPS low power receiver GNS601uLP Datasheet preliminary specification 14 TAPE&REEL INFORMATION Tape information: V 1.3, Feb 17th 2016 20 GPS low power receiver GNS601uLP Datasheet preliminary specification Reel information: H= 32.5mm Number of devices: 250pcs/reel 15 ORDERING INFORMATION Ordering information Type Part# marking GNS601uLP 4037735105386 GNS601uLP Description V 1.3, Feb 17th 2016 21 GPS low power receiver GNS601uLP Datasheet preliminary specification 16 ENVIRONMENTAL INFORMATION This product is free of environmental hazardous substances and complies with 2002/95/EC. (RoHS directive). 17 MOISTURE SENSITIVITY This device must be prebaked before being put to reflow solder process. Disregarding may cause destructive effects like chip cracking, which leaves the device defective ! Shelf life 6 months , sealed Possible prebake recommendations 12 hrs @ 60C Floor life (time from prebake to solder process) <72 hrs 18 DOCUMENT REVISION HISTORY V1.0 Jun 30 2015 V1.3 Feb 17 2016 P.Skaliks O.Diegel/ P.Skaliks initial document, preliminary Corrected Part#, general review, baud rate, PCB design hints, pictures 19 RELATED DOCUMENTS Title NMEA_Interface_manual_MTK_Vx GNS601uLP StarterKit user manual Description / file Detailed description of NMEA interface User manual for the GNS601uLP receiver based evaluation kit Available from www.gns-gmbh.com www.gns-gmbh.com GNS GMBH 2016 THE INFORMATION IN THIS DOCUMENTATION DOES NOT FORM ANY QUOTATION OR CONTRACT. TECHNICAL DATA ARE DUE TO BE CHANGED WITHOUT NOTICE. NO LIABILITY WILL BE ACCEPTED BY THE PUBLISHER FOR ANY CONSEQUENCE OF THIS DOCUMENT'S USE. REPRODUCTION IN WHOLE OR IN PART IS PROHIBITED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COPYRIGHT OWNER V 1.3, Feb 17th 2016 22