SE868Kx-Ax Family Product User Guide
1VV0301201 Rev. 5
Page 40 of 83
2021-07-15
Not Subject to NDA
9.2.3.
SE868K3-A Pinout Table
Pin
Signal
Type
Description
Notes
1
Ground
GND
Ground
2
Reserved
RES
EIT0 / GPIO12
3
Reserved
RES
GPIO9
4
Reserved
RES
Reserved. Do not connect
5
No Connection
NC
Not connected
6
Ground
GND
Ground
7
Ground
GND
Ground
8
No Connection
NC
Not connected
9
Ground
GND
Ground
10
TX0
O
UART0 Serial Output (Transmit)
11
RX0
I
UART0 Serial Input (Receive)
12
S_RESET
I
System Reset
–
Active Low
13
FORCE_ON
I
Force full-power mode
3
14
No Connection
NC
Not connected
15
SPI_MOSI
I/O
SPI Data MOSI
4
16
No Connection
NC
Not connected
17
PPS
O
Pulse Per Second signal
18
No Connection
NC
Not connected
19
SPI_CS
I/O
SPI Chip Select
4
20
Reserved
RES
GPIO10
21
Ground
GND
Ground
22
I2C Data / TX1
I/O
I2C Data / UART1 Tx
4
23
I2C Clock / RX1
I/O
I2C Clock / UART1 Rx
4
24
No Connection
NC
Not connected
25
VCC
PWR
Main power supply
26
No Connection
NC
Not connected
27
No Connection
NC
Not connected
28
DRI
O
Data Ready Indicator
29
SPI_CLK
I/O
SPI Clock
4
30
SPI_MISO
I/O
SPI Data MISO
4
31
Ground
GND
Ground
32
VBATT
PWR
Backup Power supply
Note 3: Force-On is not implemented in the MT3337
Note 4: TX1/RX1 are UART-only on the MT3337
Table 19: SE868K3-Ax Pinout Table
