Справочник Пользователя для RoyalTek meb-1000
7
MEB-1000 User Manual
1.8 Application Circuit
Figure 4 Application Circuit
Note:
(1) Serial Interface:
(Ⅰ)The TXA & RXA pin is recommended to connect to serial resistance(220
Ω
) and pull up (10KΩ). It can increase the stability of serial data.
(Ⅱ)The TXB & RXB pin is recommended to connect to serial resistance(220
Ω
) and pull up (10KΩ), if use the DGPS output.
If no use DGPS output, it don’t connect anything.
(2) Backup Battery:
It’s recommended to connect a backup battery to V_RTC_3V3.
In order to enable the warm start and hot start features of the GPS receiver.
If you don’t intend to use a backup battery, connect this pin to GND or open.
If you use backup battery, should be add a bypassing capacitor (10uF) at
V_RTC_3V3 pin. It can reduce noise and increase the stability.
In order to enable the warm start and hot start features of the GPS receiver.
If you don’t intend to use a backup battery, connect this pin to GND or open.
If you use backup battery, should be add a bypassing capacitor (10uF) at
V_RTC_3V3 pin. It can reduce noise and increase the stability.
(3) GPS_RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission
line must to controlled impedance to connect RF_IN to the antenna or
antenna connector of your choice. (Impedance 50Ω)
line must to controlled impedance to connect RF_IN to the antenna or
antenna connector of your choice. (Impedance 50Ω)
(4) Power:
Connect V_GPS_3V3 pin to DC 3.3V. The power supply must add bypassing