1.2 Physical Specification
▪ Size & Volume : 19(w) x 19(d) x 0.8(h)mm

1.3 Recommend PCB Layout

2. Module Pin Assignments and Description Table

   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		50Ω (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

   
   

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