unicore UM981 User Manual

UC-00-M33 EN R1.0 Hardware 9
No.
Pin
I/O
Description
33
VCC
I
Power supply
34
VCC
I
Power supply
35
RSV
—
Reserved
36
V_BCKP
I
When the main power supply VCC is cut off,
V_BCKP supplies power to RTC and relevant
register. Level requirement: 2.0 V ~ 3.6 V, and
the working current is less than 60 μA at
25 °C. If you do not use the hot start function,
connect V_BCKP to VCC. Do NOT 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
43
RXD1
I
COM1 input, LVTTL
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

unicore UM981 Specifications

General

Brand	unicore
Model	UM981
Category	Control Unit
Language	English