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GT-1612-MTBD

GPS&Beidou Receiver Module

www.gotop-zzu.com

Page 22 of 35

Revision: V2.0.1-January 2015

3.3. Antenna Status Indicator

GT-1612-MTBD module supports automatic antenna switching function. The GPTXT sentence can be used to

identify the status of external active antenna.

If

ANTSTATUS=OPEN

, it means external active antenna is not connected or has poor contact with antenna feeding

point and the internal antenna is used.

If

ANTSTATUS=OK

, it means external active antenna is connected and the module will use external active antenna.

If

ANTSTATUS=SHORT

, it means active antenna is short circuited and the internal patch antenna will be used

automatically.

When you use external active antenna and the “OPEN” is displayed in the GPTXT of NMEA sentence, you have
to check the connection status of external active antenna.

If the external active antenna is short-circuited, the “SHORT” will be displayed in the GPTXT of NMEA
sentence.

Because antenna short protection is enabled by default, GT-1612-MTBD will switch to embedded patch antenna
automatically in case that external active antenna is short-circuited, which will avoid GT-1612-MTBD from
damage. Meanwhile, you need to check the external active antenna.

Example

“OPEN” is displayed in the GPTXT sentence as below

Figure 15:

Patch Antenna Status Description in GPTXT

Содержание GT-1612-MTBD

Страница 1: ...foliage environment where the GPS Beidou was not possible before The small form factor and low power consumption make the module easy to integrate into portable device like PNDs mobile phones cameras...

Страница 2: ...Interface 17 2 6 EASY Technology 18 2 7 Multi tone AIC 18 2 8 LOCUS 19 2 9 Antenna Supervisor 19 2 10 PPS VS NMEA 20 3 Antenna Interfaces 20 3 1 PCB Design Guide 20 3 2 External Active Antenna 21 3 3...

Страница 3: ...stem The module supports various positioning navigation and industrial applications including autonomous GPS Beidou SBAS including WAAS EGNOS MSAS and GAGAN QZSS and AGNSS GT 1612 MTBD but also suppor...

Страница 4: ...Bm Warm start 5s typ 130dBm Hot start 1s typ 130dBm TTFF EASY disabled Cold start Autonomous 35s typ 130dBm Warm start Autonomous 30s typ 130dBm Hot start Autonomous 1s typ 130dBm Horizontal Position...

Страница 5: ...block diagram of GT 1612 MTBD module It consists of a single chip GNSS IC which includes the RF part and Baseband part a LNA a SAW filter a TCXO a crystal oscillator Figure 1 Block Diagram 1 4 Protoco...

Страница 6: ...ignment Figure 2 Pin Assignment 2 2 Pin Definition Power Supply Pin Name Pin No I O Description DC Characteristics Comment VCC 23 I Main power supply Vmax 4 3V Vmin 2 8V Vnom 3 3V Supply current not l...

Страница 7: ...d discharge function to keep long output voltage drop down period The decouple combination of 10uF and 100nF capacitor is recommended nearby VCC pin UART Port Pin Name Pin No I O Description DC Charac...

Страница 8: ...of user configuration variables The module s internal power construction is shown as below VCC supplies power for PMU and VBAT supplies power for RTC domain TIMER signal highlighted in red in the fol...

Страница 9: ...1FE FL11E from Seiko is recommended The consumption of VBAT is as low as 20uA in backup mode The schematic with power supply circuit is shown as below As power source 3 3V is always valid and the batt...

Страница 10: ...le keeps tracking satellites and demodulates the navigation data from the specific satellites When the combination of VCC and VBAT is valid the module will enter into full on mode automatically and fo...

Страница 11: ...Hot or Warm start The typical standby current consumption in this way is about 1mA VCC 3 3V When the external active antenna is used an additional 11mA will be consumed because the VCC still supplies...

Страница 12: ...ckup mode forever When this command is executed successfully TIMER signal will be pulled down to close the power switch so GT 1612 MTBD module can go into backup mode as the main power VCC is cut off...

Страница 13: ...nto periodic mode is as follows Table 5 PMTK Command Format Format PMTK225 Type Run_time Sleep_time 2nd_run_time 2nd_sleep_time checksum CR LF Parameter Format Description Type Decimal Type 1 for Peri...

Страница 14: ...fails to fix the position in run_time the module will switch to 2nd_run_time and 2nd_sleep_time automatically As long as the module fixes the position again the module will return to Run_time and Slee...

Страница 15: ...the module accesses AlwaysLocate standby mode successfully It will benefit power saving in this mode Sending PMTK225 0 2B in any time will make the module back to full on mode AlwaysLocate backup mode...

Страница 16: ...ling applications FLP function is disabled by default You can enable FLP by SDK or PMTK command Sending PMTK262 1 29 will enable FLP function and wait until GT 1612 MTBD module gets a valid fix Then w...

Страница 17: ...gnal line of DTE Figure 10 Connection of Serial Interfaces This UART port has the following features UART port can be used for firmware upgrade NMEA output and PMTK proprietary commands input The defa...

Страница 18: ...should be valid In order to get enough broadcast ephemeris information from GPS Beidou satellites the GPS Beidou module should receive the information for at least 5 minutes in good signal conditions...

Страница 19: ...ogs the basic information UTC time latitude longitude and height every 15 seconds to internal flash memory Stop logging the information by sending PMTK185 1 23 Host can get the data from the module vi...

Страница 20: ...transmission may exceed one second if there are many NMEA sentences output You can enable this function by sending PMTK255 1 2D and disable the function by sending PMTK255 0 2C 3 Antenna Interfaces 3...

Страница 21: ...stic impedance of the high frequency line according to the principle of high frequency wiring Requirements this section of the line in the 1575 42MHz frequency characteristic impedance requirement is...

Страница 22: ...it means active antenna is short circuited and the internal patch antenna will be used automatically When you use external active antenna and the OPEN is displayed in the GPTXT of NMEA sentence you h...

Страница 23: ...stress ratings only The product is not protected against over voltage or reversed voltage If necessary voltage spikes exceeding the power supply voltage specification given in table above must be limi...

Страница 24: ...n in the following table Table 12 Current Consumption The tracking current is tested in the following conditions In Cold Start 10 minutes after First Fix In Hot Start 15 seconds after First Fix Parame...

Страница 25: ...ity 45 4 5 Reliability Test Table 14 Reliability Test Pin Contact Discharge Air Discharge RF_IN 5KV 10KV Patch Antenna 5KV 10KV VCC 5KV 10KV UART 3KV 6KV Others 2KV 4KV Test Item Conditions Standard T...

Страница 26: ...op side of the PCB It is suggested that the minimum height of solder paste stencil is 100um to ensure sufficient solder volume Pad openings of paste mask can be increased to ensure proper soldering an...

Страница 27: ...l is opened and the module is exposed to excessive humidity GT 1612 MTBD should be baked for 192 hours at temperature 40 C 5 C 0 C and 5 RH in low temperature containers or 24 hours at temperature 125...

Страница 28: ...2015 6 4 Tape and Reel Packaging Unit mm Quantity per reel 1000pcs Lengh per reel 20m Figure 18 Tape and Reel Specifications Figure 19 Packaging physical Figure Table 15 Reel Packaging Model Name MOQ...

Страница 29: ...Fix Data GLL Geographic Position Latitude Longitude GLONASS Global Navigation Satellite System GSA GNSS DOP and Active Satellites GSV GNSS Satellites in View HDOP Horizontal Dilution of Precision I O...

Страница 30: ...Precision VTG Course over Ground and Ground Speed Horizontal Course and Horizontal Velocity WAAS Wide Area Augmentation System Inom Nominal Current Imax Maximum Load Current Vmax Maximum Voltage Value...

Страница 31: ...TC Position 161229 487 hhmmss sss Latitude 3723 2457 ddmm mmmm N S indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator W E east or W west Position Fix Indicator 1 See Table 18...

Страница 32: ...sss Status A A data valid or V data not valid Check sum 2C CR LF End of message temination 8 2 3 GSA GNSS DOP and Active Satellites xxGSA A 3 07 02 26 27 09 04 15 1 8 1 0 1 5 33 Table 20 GSA Data Form...

Страница 33: ...ge 1 to 66 Elevation 79 degrees Channel 1 Maximum 90 Azinmuth 048 degrees Channel 1 True Range 0 to 359 SNR C NO 42 dBHz Range 0 to 99 null when not tracking Satellite ID 27 Channel 4 Range 1 to 66 El...

Страница 34: ...E east or W west Check sum 10 CR LF End of message termination 8 2 6 VTG Course Over Ground and Ground Speed xxVTG 309 62 T M 0 13 N 0 2 K 6E Table23 VTG Data Format Name Example Units Description Mes...

Страница 35: ...omissions in these materials nor for its use Gotop reserves the right to change specification at any time without notice These materials are provides as is without warranty of any kind either express...

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