RESET
An external reset is initiated by pulling RESET low for at least 1 µs. If not used, RESET can be left unconnected since there is an internal 10k pull-up resistor.
RESET is also used in Push-to-Fix mode in order to wake up the unit and request a position fix. Minimum pulse width is 1 µs.

BOOTSEL
The boot signal BOOTSEL forces special debug mode when restarted with a reset signal or power-up. If not used, BOOTSEL can be left unconnected since there is an internal 100k pull-down resistor.

RF IN
The line on the PCB from the antenna (or antenna connector) has to be a controlled
impedance line (Microstrip at 50Ω).

VBAT
This is the battery backup supply that powers the SRAM and RTC when power is removed. Without an external backup battery or on board battery, engine board will execute a cold start after every turn on. To achieve the faster start-up offered by a hot or warm start, either a backup battery must be connected or battery installed on board.

TIMEMARK
This pin provides one pulse per second output from the engine board which is synchronized to within one microsecond of GPS time. The output is TTL negative level signal with negative logic.

3. Electrical Specifications
   3.1. Absolute Maximum Ratings
   Warning – Stressing the device beyond the “Absolute Maximum Ratings” may cause permanent damage. These are stress ratings only. Operation beyond “Operating conditions” is not recommended and extended exposure beyond the “Operating condition” may affect device reliability. This module is not protected against over voltage, reversed voltage or short current of RF_IN port.

   Parameter	Min	Max	Unit
   Power supply voltage(VCC)	3.0	5.5	V
   Serial port input voltage	-0.3	5.0	V
   BOOTSEL input voltage	-0.3	3.6
   Storage temperature	-65	150	℃

   
   
4. Operating Conditions
   4.1. DC Characteristics
   (Test Temperature : 25℃)
   

   Parameter	Condition	Min	Typ	Max	Unit
   Power Supply voltage (Module input power)	VCC	3.0	3.3	5.0	V
   Operating supply voltage (SiRF StarⅢ Chipset)	VCC_RF VDD_BB	2.7	2.85	3.0	V
   Operating supply ripple voltage				50	mVpp
   BOOTSEL input voltage	BOOTSEL	2.7	2.85	3.0	V
   External Antenna output voltage	V-ANT0	2.7	2.85	3.0	V
   Backup battery input voltage	V_BAT	2.0	3.0	3.3	V
   Sustained supply current	VCC=5.0V		70		mA
   Peak supply current	VCC=5.0V		87		mA
   Operating temperature	VCC=5.0V	-40	+25	+85	℃

   
   
5. The Block Diagram of Module
   
   
   
6. Application Schematics
   6.1 For Active Ant.
   
   
   
   NMEA-0183 Output Message
   MTI-8 module support a subset of the NMEA-0183 standard for interfacing marine electronic devices as defined by the National Marine Electronics Association (NMEA).
   NMEA Output messages
   The following is written assuming the user has a basic understanding of NMEA protocols and their use.
   GGA : Time, position and fix type data.
   GLL : Latitude, longitude, UTC time of position fix and status.
   GSA : GPS receiver operating mode, satellites used in the position solution, and DOP values.
   GSV : The number of GPS satellites in view satellite ID numbers, elevation, azimuth,
   and SNR values.
   MSS : Signal-to-noise ratio, signal strength, frequency, and bit rate from a radio-beacon receiver.
   RMC : Time, date, position, course and speed data.
   VTG : Course and speed information relative to the ground.
   ZDA : PPS timing message (synchronized to PPS).
   
   
7. Reflow Profile
   
   
   

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