Pin Description

Name	Pin	Type	Description
DCDC_IN	21	Power	DC/DC power input
DCDC_OUT	22	Power	DC/DC power output
V_CORE	23	Power	Core power input
V_BACK	6	Power	Backup power input
VDD_IO	7	Power	IO/TCXO power input
LDO_C	24	Power	Core LDO voltage output
LDO_X	2	Power	TCXO LDO voltage output
LDO_EX	5	Power	Used by the chip itself, and cannot supply power to other circuits
GND	20	-	Connect to Ground
V_DET¹	8	Power	Antenna detection power input
VDD_ANT	9	Power	Antenna power output
LDO_RET	10	Power	Backup power output
GND			Ground

¹. Not supported currently. ↩

Name	Pin	Type	Description
L1_IN	40	RF	L1 RF input
L5_IN	38	RF	L5 or L2 RF input
TCXO_IN	3	Clock	26 MHz TCXO input
RTC_I	12	Clock	32.768 kHz crystal or digital waveform input
RTC_O	11	Clock	32.768 kHz clock output
NC	4	-	Keep NC
NC	39	-	Keep NC
NC	1	RF	Keep NC

Name	Pin	Type	IO Reset	Description
PIO0	25	IO	I/Pull-up	GPIO0
PIO1	28	IO	I/Pull-up	GPIO1
PIO2	27	IO	I/Pull-up	GPIO2
PIO3	30	IO	I/Pull-up	GPIO3
PIO4	26	IO	I/Pull-up	GPIO4
PIO5	29	IO	I/Pull-up	GPIO5
TX	19	IO	I/Pull-up	GPIO6
RX	18	IO	I/Pull-up	GPIO7
SCL	31	IO	I/Pull-up	GPIO8
SDA	32	IO	I/Pull-up	GPIO9
D_SEL	33	IO	I/Pull-up	GPIO10
PPS	35	IO	I/Pull-up	GPIO11
BOOT_MODE	34	IO	I/Pull-up	GPIO12
PIO13	14	IO	I/Pull-up	GPIO13
PIO14	13	IO	I/Pull-up	GPIO14
PIO15	36	IO	I/Pull-up	GPIO15
PIO16	37	IO	I/Pull-up	GPIO16
TMS	16	IO	I/Pull-up	GPIO17
TCK	15	IO	I/Pull-up	GPIO18
RESETN	17	IO	I/Pull-up	-

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