
NE866B1_Hardware_Design_Guide
1VV0301354 Rev. 6
Page
15
of
70
2018-02-28
3. PINS ALLOCATION
Pin-out
Pin
Signal
I/O
Function
Type
Comment
Asynchronous Serial Port - Prog. / Data / SPI / I2C / GPIO
A4
TXD
I
Serial data input
from DTE
CMOS 1.8V
A5
RXD
O
Serial data output
to DTE
CMOS 1.8V
B1
GPIO1
I/O
GPIO
CMOS 1.8V
Default
function
SPI_CS
O
SPI External CS
CMOS 1.8V
Alternate
Function
I2C_SDA
I/O
I2C Data
CMOS 1.8V
Alternate
Function
A1
SPI_CLK
O
SPI Clock
CMOS 1.8V