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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
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TX1 O Serial Port 1
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RX1 I Serial Port 1
16
NC
17
NC
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GND G Reference Ground
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Time Mark O One pulse per second
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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