unicore UM621N Guide

HARDWARE
REFERENCE DESIGN
WWW.UNICORECOMM.COM
UM621N
Automotive Grade Dual-frequency
Multi-GNSS Integrated Positioning
Module
Copyright© 2009-2023, Unicore Communications, Inc.
Data subject to change without notice.

i
Revision History
Version
Revision History
Date
R1.0
First release
Oct. 2022
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UM621N V1R0 Hardware Reference Design
I
Contents
1Reference Circuit Using an Active Antenna .................................................................1
2Reference Circuit Using a Passive Antenna ................................................................2
3Recommended BOM ....................................................................................................3

1
1Reference Circuit Using an Active Antenna
The supply voltage for VCC is 2.7 V ~ 3.6 V
Ground all GND pins of the module
Connect the RF_IN signal to the antenna; note the 50 Ω impedance matching
Feed the antenna with external power supply
The supply voltage for VBCKP is 1.7 V ~ 3.6 V
Requirement for the odometer speed pulse: width ≥100 us, frequency ≤5K Hz
Active Low
VCC 2.7 V~3.6V
VBCKP 1.7 V~3.6V
RF Short 50ohm Line
Figure 1-1 Reference Circuit Using an Active Antenna

UM621N V1R0 Hardware Reference Design
2
2Reference Circuit Using a Passive Antenna
When using a passive antenna, a low noise amplifier should be added between
the antenna and the RF_IN of the module in order to ensure the performance of
the system.
For the RF routing (antenna LNA RF_IN), note the 50 Ω impedance matching
The supply voltage for VBCKP is 1.7 V ~ 3.6 V
Requirement for the odometer speed pulse: width ≥100 us, frequency ≤5 KHz
Active Low
VCC 2.7 V~3.6V
VBCKP 1.7 V~3.6V
RF Short 50ohm Line
Figure 2-1 Reference Circuit Using a Passive Antenna

3
3Recommended BOM
Component
Order No.
Manufacturer
U1
RS-232
Transceivers
MAX3232EUE+
TI
U2
LNA
MXDLN14TP
MAXSCEND

和芯星通科技（北京）有限公司
Unicore Communications, Inc.
北京市海淀区丰贤东路 7 号北斗星通大厦三层
F3, No.7, Fengxian East Road, Haidian, Beijing, P.R.China,
100094
www.unicorecomm.com
Phone: [phone]
Fax: [phone]
[email protected]
www.unicorecomm.com