| Pin No. |
Signal name |
I/O |
Description |
Note |
| 1 |
VCC |
PWR |
Power Supply Voltage |
3.0~5.0V DC Supply input |
| 2 |
GND |
PWR |
Ground |
¡@ |
| 3 |
FREQXFEL |
I |
External CMOS clock source |
¡@ |
| 4 |
TXB |
O |
Serial outputs for channel B |
¡@ |
| 5 |
RXB |
I |
Serial inputs for channel B |
¡@ |
| 6 |
TIMEMARK |
I/O |
1 pps timemark output |
¡@ |
| 7 |
TXA |
O |
Serial outputs for channel A |
¡@ |
| 8 |
RXA |
I |
Serial inputs for channel A |
¡@ |
| 9 |
GPIO 14 |
I/O |
General Purpose Input Output |
Leave unconnected if not used |
| 10 |
GPIO 4 |
I/O |
General Purpose Input Output |
Leave unconnected if not used |
| 11 |
AMP-INTR |
I/O |
External interrupt[0] |
Alternate function is GPIO 10 |
| 12 |
RF-ON |
I |
Power control of RF chip. |
Leave unconnected if not used |
| 13 |
Bootsel |
I |
Module Boots Port
5.0V : Boot ON
N.C : Boot OFF(Normal) |
Module boots into special debug
Mode if VCC during reset |
| 14 |
GND |
PWR |
Ground |
¡@ |
| 15 |
GND |
PWR |
Ground |
¡@ |
| 16 |
GND |
PWR |
Ground |
¡@ |
| 17 |
GND |
PWR |
Ground |
¡@ |
| 18 |
GND |
PWR |
Ground |
¡@ |
| 19 |
GND |
PWR |
Ground |
¡@ |
| 20 |
GND |
PWR |
Ground |
¡@ |
| 21 |
GND |
PWR |
Ground |
¡@ |
| 22 |
RF IN |
I |
GPS RF Input |
50£[ (1.57542GHz) |
| 23 |
GND |
PWR |
Ground |
¡@ |
| 24 |
V-ANT0 |
PWR |
Power supply out of Active antenna |
¡@ |
| 25 |
V-BAT |
PWR |
BackupVoltage supply for RTC and SRAM |
Leave unconnected if not used |
| 26 |
WAKE UP |
OD |
Wake up from RTC (Open Drain) |
Leave unconnected if not used |
| 27 |
RESET |
I/O |
Active low reset |
Leave unconnected if not used |
| 28 |
GPIO0 |
I/O |
General Purpose Input Output |
Leave unconnected if not used |
| 29 |
GPIO1 |
I/O |
General Purpose Input Output |
Leave unconnected if not used |