Quectel L76 Guida

L76 Series

Reference Design

GNSS Module Series

Rev. B

Date: 2016-05-17

www.quectel.com

GNSS Module Series

L76 Series Reference Design

L76_Series_Reference_Design Confidential / Released 1 / 4

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GNSS Module Series

L76 Series Reference Design

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About the Document

History

Revision

Date

Author

Description

2016-04-26

Storm BAO

Initial

2016-05-17

Storm BAO

Added I2C information of L76-L

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GNSS Module Series

L76 Series Reference Design

L76_Series_Reference_Design Confidential / Released 3 / 4

Contents

About the Document...................................................................................................................................2

Contents.......................................................................................................................................................3

1Introduction..........................................................................................................................................4

1.1. Introduction................................................................................................................................4

1.2. Schematics................................................................................................................................4

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L76 Series Reference Design

L76_Series_Reference_Design Confidential / Released 4 / 4

1Introduction

1.1. Introduction

This document is a reference design for L76 series module. The schematics included in this document

are preliminary and are subject to change without prior notice.

1.2. Schematics

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Reference DesignL76 Series

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UART Circuit

Power Management Circuit (Optional)

3.3V Power Suppply and UART Circuit

Customer's MCU

Generally, 100R for R102 and R103 is recommended, but 0R also works well.

R102, R103 are reserved for debugging the waveform of UART,

and they are also beneficial to ESD protection.

There are two ways to enter into backup mode and back to full on mode, you can choose

1. Send command “$PMTK225,4*2F” to enter into backup mode forever. The only way to

wake up the module is pulling the FORCE_ON high. Here, Q101, Q102, R101 are not

2. Cutting off VCC and keeping V_BCKP powered will make the module enter into backup

mode from full on mode. As long as the VCC pin is powered, the module will enter into full on

the dedicated way base on your requirement.

mounted; R104 and R106 are 0 ohm.

mode immediately. Here, Q101, Q102, R101 are mounted; R104 and R106 are not mounted.

C102

100nF

R105

D101

C101

4.7uF

Q101

SI2333DS

R101

10K

Q102

DTC143ZEBTL

R104

NM_0R

VCC

GND

GPIO_X

RXD

GPIO_X

TXD

GPIO_X

U101

MCU

R102

100R

R103

100R

R106

NM_OR

VCC_MCU_3.3V GPS_EN

TXD_MCU

RXD_MCU

GPIO_RESET

GPIO_STANDBY

TXD_MCU RXD1_MODULE

RXD_MCU TXD1_MODULE

GPS_EN

VCC_MODULE_3.3V

VCC_MCU_3.3V

FORCE_ON

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Reference DesignL76 Series

LDO Circuit

Customer's MCU

The transistor circuit will realize the voltage level shifting between

current from one power-on device to another power-off device.

Level Shifting for UART

5V Power Suppply and UART Circuit

VCC_MCU_5V and VCC_MODULE_3.3V, and block the leakage

1VIN

2GND

3CE

VOUT

U202

XC6209F332MR

C201

100uF

C204

100nF

C202

100nF

R204

4.7K

R203

4.7K

Q202

R205

4.7K

Q201

R202

4.7K

R207

D201

C203

4.7uF

R201

4.7K

R206

10K

VCC

GND

GPIO_X

RXD

GPIO_X

TXD

GPIO_X

U201

MCU

VCC_MCU_5V

TXD_MCU

RXD_MCU

VCC_MCU_5V

RXD_MCU

VCC_MCU_5V

VCC_MODULE_3.3V

TXD1_MODULE

VCC_MODULE_3.3V

RXD1_MODULE

TXD_MCU

VCC_MCU_5V

GPIO_RESET

GPIO_STANDBY

GPS_EN

VCC_MODULE_3.3V

GPS_EN

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Reference DesignL76 Series

V_BCKP is designed to supply power for L76 series RTC

Indicating Circuit

Module Interface

The 1PPS indicator will blink at 1Hz frequency

Module Interface

Test Points

Charge Circuit for RTC Logic

logic circuit when VCC_MODULE_3.3V is powered off.

after fixing the position.

Reset Circuit

1. If the reset function is unused, the RESET

pin can be connected to the VCC directly.

Standby Circuit

2. Enter into standby mode: change the STANDBY pin

from high to low level.

3. Exit from standby mode: change the STANDBY pin

from low to high level.

For more details, please refer to L76 Series Hardware Design.

Schottky Diode

2. RESET has been pulled up internally.

1. STANDBY has been pulled up internally.

3. The test points are reserved for debugging the GNSS module.

2. For L76-L, pin16 and pin17 are I2C_SDA and I2C_SCL, respectively .

1. UART1 can be used to output NMEA message as well as to upgrade firmware.

For L76/L76B, pin16 and 17 are reserved,and please keep them open.

I2C Circuit for L76-L

1. I2C_SDA/I2C_SCL is pulled up to 2.8V inside L76-L moule.

There is no need to add a pull-up resistor externally.

2. The voltage threshold of I2C is 2.8V. If the system voltage

is not consistent with it,a level shifter circuit must be used.

B301 MS621FE-FL11E

R302

D302

RB520S30T1G

Q301

DTC143ZEBTL

R301

D301

L76_SERIES_RXD1

L76_SERIES_TXD1

GND

L76_SERIES_VCC

10 GND

11 RF_IN

12 GND

13 ANTON

14 VCC_RF

15 NC

16 RESERVED/I2C_SDA

17 RESERVED/I2C_SCL

18 FORCE_ON

RESET

VCC

V_BCKP

STANDBY

1PPS

RXD1

TXD1

GND

U301

C302

100nF

Q302

DTC143ZEBTL

Q303

DTC143ZEBTL

C301

10uF

C303 4.7uF

C304 100nF

1VCC

2SDA

3SCL

4GND

U302

VCC_MODULE_3.3V

1PPS

TXD1_MODULE

RXD1_MODULE

VCC_MODULE_3.3V

GND

RF_IN

VCC_RF

VCC_MODULE_3.3V

RESET

GPIO_RESET

STANDBY

GPIO_STANDBY

VCC_MODULE_3.3V

V_BCKP

ANTON

RESET

VCC_MODULE_3.3V

V_BCKP

STANDBY

1PPS

TXD1_MODULE

RXD1_MODULE

FORCE_ON

I2C_SDA

I2C_SCL

I2C_SDA

I2C_SCL

VCC_MCU

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Reference DesignL76 Series

Antenna Interface

1. Pi circuit (C401, C402, C403) is reserved for impedance matching for antenna.

For more details, please refer to L76 Series Hardware Design.

5. Impedance of RF trace should be controlled as 50 ohm and the trace length

should be kept as short as possible.

2. VCC_RF can be used as power supply for active antenna. Its typical value is 3.3V,

and the voltage ranges from 2.8V to 4.3V (VCC_RF=VCC). If it does not meet the

By default, C402 and C403 are not mounted; C401 is 100pF.

1.There is no need to use an external LNA for L76-L module

because an embedded LNA is already used inside the module.

Active Antenna

Passive Antenna

requirement of the active antenna, an external LDO could be used.

3. The voltage level of ANTON will be pulled down in standby mode.

4. If the L76 series module never enter into standby mode in the design, the ANTON

pin should be kept floated.

Optional:used to save

power if necessary.

(Optional)

LNA Circuit

2. Pi circuit (R405, C405, C406) is reserved for impedance matching for antenna.

By default, C405 and C406 are not mounted; R405 is 0R.

3. If an external LNA is added between passive antenna and L76/76B module, the total

sensitivity will be improved by about 3dB, which is beneficial for improving TTFF.

4. One typical reference circuit with BGA524N6 is given in the left figure. Here,

By default, C407 is 1nF; L402 is 8.2nH; and L403 is not mounted.

For more details, please refer to L76 Series Hardware Design.

7. Impedance of RF trace should be controlled as 50 ohm and the trace length should be

kept as short as possible.

5. VCC_RF can be used as power supply for LNA. Its voltage range is from 2.8V to 4.3V,

and its typical value is 3.3V (VCC_RF=VCC)

6. ANTON is an optional pin which can be used to control the enable pin of an external

LNA. If “ANTON” function is not used, please connect the pin “LNA ENABLE”

to VCC to keep LNA always on.

C407, L402 and L403 form a reserved matching circuit for the LNA BGA524N6.

No need to add for L76-L

which has an embedded LNA

C401

100pF

J401

Active Antenna

C403

C402

R401

10R

L401

47nH R402

10K

Q401

SI2333

Q402

DTC143ZEBTL

R405

J402

Passive Antenna C406

C405

C409

33nF

C408

100pF

L402

8.2nH

L403

4GND

5AI

6PON

AO 2

VCC 1

GND

U401

BGA524N6

C407

1nF

R403

100R

R404

100R

VCC_RF

RF_IN

ANTON

VCC_RF

RF_IN

ANTON

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