BD - 172 is a dual-mode BD2 / GPS navigation and positioning module. Using space calling from huaxun beidou second generation veneer integrated dual-mode baseband chip and dual-mode rf chip, can access BD2 and GPS signals at the same time. External use 3.3 V power supply. BD - 172 module support for active antenna power supply (3.3 V). BD - 172 module USES 28 encapsulation, pin stamp hole size 2.4 mmX17mmX2. 8 mm. BD - 172 in line with the "beidou application promotion group" type I specifications. BD - 172 hardware (size and pin definition) is fully compatible with UBlox LEA - 4/5/6 series modules, can be directly replace on the board. Product introduction: 28 encapsulation, pin stamp hole size 17 mm x 2.4 mm x 2.8 mm using BD2 / GPS dual-mode baseband chips and BD2 / GPS dual-mode rf chip, can access BD2 and GPS signals at the same time support three work modes, and may at any time to each other to switch 1. Single BD2 work mode 2. Single GPS work mode 3. BD2 / GPS mixed work mode 2 UART serial port NMEA serial port: 0183 Standard NMEA, the default baud rate: 9600 BPS Debug serial port: support for software deb ing and Flash version upgrade, the default baud rate: 15200 BPS built-in BD2 / GPS LNA (low noise amplifier) module used + 3.3 V power supply with backup power input interface, support hot start itself on electric reset circuit, and to support real-time external reset by the user Capture sensitivity: - 147 DBM tracking sensitivity: - 159 DBM cold start time: < 36 seconds Warm start time: < 36 seconds Hot start time: < 1 second positioning accuracy: < 5 meters (CEP, - 130 DBM) packaging: 28 pin SMT size: 17 mm x 2.4 mm x 2.8 mm working temperature: - 40 ℃ 85 ℃ ∽ power supply: external single power 3.3 V power supply