UNICORECOMM UM220-IV M0 Manuel utilisateur

WWW.UNICORECOMM.COM

Data subject to change without notice.

Communications, Inc.

REFERENCE DESIGN

HARDWARE

GNSS Positioning Module

UM220-IV M0

Revision History

Version

Revision History

Date

Ver. 1.0

HW reference design, primary

Aug. 2018

Ver. 1.1

Change the symbol of V_BCKP from button

battery to power

TXD connects 1K resistance in series

Aug. 2019

R1.2

Update Copyright time

Apr. 2020

Disclaimer

Information in this document is subject to change without notices and does not

represent a commitment on the part of Unicore Communication, Inc. No part of this

manual may be reproduced or transmitted in any form or by any means, electronic or

mechanical, including photocopying and recording, for any purpose without the express

written permission of a duly authorized representative of Unicore Communications, Inc.

The information contained within this manual is believed to be true and correct at the

time of publication.

UM220-IV M0 Hardware Reference Design

Contens

1. Minimum System Reference Circuit.........................................................................................1

2. Reference Circuit Using a Passive Antenna..............................................................................2

3. Attachment................................................................................................................................5

1. Minimum System Reference Circuit

Supply 2.8V~3.6V power VCC

Ground all GND pins of the module

Connect RF_IN signal to antenna, note the 50 Ω impedance match on the circuit

Figure 1 Minimum System Reference Circuit

GND

nRESET

RXD

TXD

68nH

GND

C2 100pF

C1 100nF

R2 0

R5 0

GND C10 100nF

VBCKP

VBCKP：1.4V~3.6V

VCC：2.8V~3.6V

GND

10 uF

VCC

GND

100nF

Active Ant

+3V

TXD

RXD

UM220-IV-M0

nREST

NC2 13

TIMEPULSE

NC1

5NC3 15

VCC_RF 14

GND 10

RF_IN 11

GND 12

VCC_IO

NC6 18

NC4 16

NC5 17

TXD

RXD

V_BCKP

VCC

GND

C7100nF

C9100nF

100nF

MAX3232EUE+

DIN1

DIN2

ROUT1

12 ROUT2

DOUT1 14

DOUT2 7

RIN1 13

RIN2 8

V+

C1+ 1

C1- 3

C2+ 4

C2- 5

V-

VCC

GND

100nF

GND

DB9

R3 100

R4 100

R1 1K

Active Low

UM220-IV M0 Hardware Reference Design

2. Reference Circuit Using a Passive Antenna

To ensure the system performance, low noise amplifier and filter should be added

between the passive antenna and the module RF_IN

The VCC_RF output of the module is recommended for power supply with LNA

RF wire (Antenna → LNA → SAW → RF_IN), note the impedance matching at 50Ω

Figure 2 Reference Circuit Using a Passive Antenna

UM220-IV-M0

nREST

NC2 13

TIMEPULSE

NC1

5NC3 15

VCC_RF 14

GND 10

RF_IN 11

GND 12

VCC_IO

NC6 18

NC4 16

NC5 17

TXD

RXD

V_BCKP

VCC

GND

FB1

220@100MHz

VCC_RF

GND C12 100nF

VBCKP

VCC：2.8V~3.6V

VBCKP：1.4V~3.6V

R1 1K

Active Low

R2 0

R5 0

nRESET

GND

RXD

TXD

GND

10 uF

GND

VCC C5

100nF

+3V

TXD

RXD

C9 100nF

C11 100nF

C10

100nF

MAX3232EUE+

DIN1

DIN2

ROUT1

12 ROUT2

DOUT1 14

DOUT2 7

RIN1 13

RIN2 8

V+

C1+ 1

C1- 3

C2+ 4

C2- 5

V-

VCC

GND

100nF GND

GND GND

DB9

R3 100

R4 100

GND

MAX2659ELT+U1

GND#1 1

GND#2 2

RFIN

VCC

SHDN#

RFOUT 6U2 TA0757A

GND#2 3

OUT

4GND#3 5

GND#1 2

L1 6.8nH

1uF

100nF GND GND

C2 100pFC1 100pF

Passive Ant 1

GND VCC_RF

3. Attachment

Here are two options to avoid module startup abnormality caused by string power.

Option 1

No external pull-up resistor is allowed to connect with the output pin TXD；

Option 2

When the module is not powered on, make sure the IO port connected to the

module is in high resistance state or low level to avoid string power.

www.unicorecomm.com

和芯星通科技（北京）有限公司

Unicore Communications, Inc.

www.unicorecomm.com

Phone: 86-10-69939800

Fax: 86-10-69939888

info@unicorecomm.com

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

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