UNICORECOMM UM980 - Page 16

UC-00-M32 EN R1.1 Hardware 11
No.
Pin
I/O
Description
connect it to ground or leave it floating.
37
GND
—
Ground
38
NC
—
No connection inside
39
NC
—
No connection inside
40
NC
—
No connection inside
41
GND
—
Ground
42
TXD1
O
COM1 output, LVTTL level
43
RXD1
I
COM1 input, LVTTL level
44
SDA
I/O
I
2
C data
45
SCL
I/O
I
2
C clock
46
NC
—
No connection inside
47
NC
—
No connection inside
48
GND
—
Ground
49
RESET_N
I
System reset; active Low. The active time
should be no less than 5 ms.
50
NC
—
No connection inside
51
EVENT
I
Event mark input, with adjustable frequency
and polarity
52
NC
—
No connection inside
53
PPS
O
Pulse per second, with adjustable pulse
width and polarity
54
NC
—
No connection inside