unicore UM220-IV M0, Инструкция по установке и эксплуатации, Страница: 13 / 21

UM220-IV M0 User Manual
8
3.4 Pin Definition (Top View)
GND
NC
VCC_RF
NC
NC
RXD
TIMEPULSE
GND
TXD
GND
nRESET
NC
NC
RF_IN
NC
V_BCKP
VCC_IO
VCC
Top View
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
Figure 3-2 UM220-IV M0
No Name I/O Electrical level Description
1 GND I Ground
2 TXD O LVTTL UART 1-TX
3 RXD I LVTTL UART 1-RX
4 TIMEPULSE O LVTTL 1PPS
5 NC I LVTTL Reserve
6 V_BCKP I 1.65V~3.6V
Voltage for RTC. If you do not use the hot
start function, connect V_BCKP to VCC.
Do NOT connect it to ground or leave it
floating.
7 VCC_IO I 3.0V~3.6V GPIO power supply
8 VCC I 3.0V~3.6V Main power
9 nRESET I LVTTL
For reset, Low level active, if you do not
use the pin, please leave it hanging
10 GND I Ground
11 RF_IN I GNSS signal input (BDS B1+GPS L1
）
12 GND I Ground
13 NC O Reserve
14 VCC_RF
4
O =VCC Output voltage RF section
15 NC I/O Reserve
16 NC I/O Reserve
17 NC I/O Reserve
4 VCC_RF does not have short circuit detection function;