unicore UM981 User Manual

UC-00-M33 EN R1.0 Hardware 7
Table 2-1 Pin Description
No.
Pin
I/O
Description
1
GND
—
Ground
2
ANT_IN
I
GNSS antenna signal input
3
GND
—
Ground
4
ANT_DETECT
I
Antenna signal detection
5
ANT_OFF
O
Disable external LNA
6
ANT_SHORT_N
I
Antenna short circuit detection; active low
7
VCC_RF
6
O
External LNA power supply
8
SPIS_CSN
I
Chip select pin for SPI slave
9
SPIS_MOSI
I
Master Out / Slave In. This pin is used to
receive data in slave mode.
10
SPIS_CLK
I
Clock input pin for SPI slave
11
SPIS_MISO
O
Master In / Slave Out. This pin is used to
transmit data in slave mode.
12
GND
—
Ground
13
RSV
—
Reserved
14
GND
—
Ground
15
NC
—
No connection inside
16
NC
—
No connection inside
17
NC
—
No connection inside
18
NC
—
No connection inside
6
Not recommended to take VCC_RF as ANT_BIAS to feed the antenna. See section 3.2 for more
details.

unicore UM981 Specifications

General

Brand	unicore
Model	UM981
Category	Control Unit
Language	English