RoyalTek MEB-1000 - Manual (Page 7)

3
MEB-1000 User Manual
4 VCC I DC Supply Voltage Output 3.3V±5%
5 Reset I External Reset Signal
6 NC
7 NC
8 NC
9 NC
10 NC
11 TX0 O Serial Port 0
12 RX0 I Serial Port 0
13 NC
14 TX1 O Serial Port 1
15 RX1 I Serial Port 1
16 NC
17 NC
18 GND G Reference Ground
19 Time Mark O One pulse per second
20 GND G Reference Ground
Table 1-2 Switch U4
Pin # Signal Name 0/1 Description Characteristics
1 GPIO-0 GPIO input/output Switch:
0:Low 1:High CMOS
TTL Level
2 GPIO-4 GPIO input/output Switch:
0:Low 1:High CMOS
TTL Level
3 N.C
4 N.C
5 GPS_3V3 Power supply for GPS section Switch:
0:Low 1: DC 3.3V
output
6 N.C
7 N.C
8 RF_Bias RF_Bias voltage switch 0: open. No voltage
provide antenna.
1:Provide 2.85V to