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GPIO Functions
Several I/Os are connected to the digital interface connector for custom applications.
Application Circuit
Antenna
3.3V
C1
1U
1
BATTERY
Recommended Layout PAD
VCC_RF
R5
50 ohm microstrip line
1
2
1
2
.
.
LNA
SAW FILTER
option
1
C2
2
0.1U
3
RB715F
R46
2
560R
ET-318
U1
GPS
1
GND
2
RF_IN
3
GND
RESET
4
NRESET
5
VCC_IN
6
VBAT
RXB
7
RXB
TXB
8
TXB
Specifications are subject to be changed without notice.
Page 6 of 16
Version 1.3.1
GPIO15
17
GPIO15
GPIO13
16
GPIO13
TIMEMARK
15
TIMEMARK
GPIO14
14
GPIO14
GPIO1
13
GPIO1
RXA
12
RXA
TXA
11
TXA
BOOTSEL
10
BOOTSEL
9
GND
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