unicore UM980 - Page 13

UM980 User Manual
8
No.
Pin
I/O
Description
20
RTK_STAT
O
RTK status: active high;
outputs high for RTK fixed solution and low
for other positioning status or no positioning
21
ERR_STAT
O
Error status: active high;
outputs high when failing self-test, and low
when passing self-test
22
RSV
—
Reserved, must be floating
23
RSV
—
Reserved, must be floating
24
NC
—
No connection inside; leave floating
25
NC
—
No connection inside; leave floating
26
RXD2
I
COM2 input, LVTTL level
27
TXD2
O
COM2 output, LVTTL level
28
BIF
—
Built-in function; recommended to add a
through-hole testing point and a 10 kΩ pull-
up resistor; cannot connect ground or power
supply, and cannot input/output data, but
can be floating
29
BIF
—
Built-in function; recommended to add a
through-hole testing point and a 10 kΩ pull-
up resistor; cannot connect ground or power
supply, and cannot input/output data, but
can be floating
30
TXD3
O
COM3 output, which can be used as CAN
TXD, LVTTL level
31
RXD3
I
COM3 input, which can be used as CAN RXD,
LVTTL level
32
GND
—
Ground
33
VCC
I
Power supply