Fibocom Wireless NL668LA User Manual

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FIBOCOM NL668-LA Series Hardware User Manual Page 1 of 65

FIBOCOM NL668-LA Hardware User Manual

Version: V1.0.0 Date: 2019-06-06

Applicability type

FIBOCOM NL668-LA Series Hardware User Manual

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No.

Product model

Description

1 NL668-LA

MCP is 4+2，support MAIN_ANT, DIV_ANT, GNSS_ANT

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excerpt, copy any part of or the entire document, or transmit the document in any form.

Notice

The document is subject to update from time to time owing to the product version upgrade or other reasons. Unless otherwise specified, the document only serves as the user guide. All the statements, information and suggestions contained in the document do not constitute any explicit or implicit guarantee.

Trademark

The trademark is registered and owned by Fibocom Wireless Inc.

Versions Record

Version

Author

Assessor

Approver

Update Date

Description

V1.0.0

Gaoying

Tumin

Chenguojiang

2019-06-06

Initial version

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Content

Content ................................................................................................................................................ 4

Figure Index ........................................................................................................................................ 7

Table Index .......................................................................................................................................... 8

Introduction .................................................................................................................................. 10

1.1 Document Introduction ..................................................................................................................... 10

1.2 Safety precautions ............................................................................................................................ 10

Product Overview ....................................................................................................................... 12

2.1 Product Introduction ......................................................................................................................... 12

2.2 Product Specification ....................................................................................................................... 12

2.3 Functional .......................................................................................................................................... 13

2.4 Evaluation Board .............................................................................................................................. 14

Pin Description ............................................................................................................................ 15

3.1 Pin Assignment ................................................................................................................................. 15

3.2 Pin function ........................................................................................................................................ 15

Electrical characteristics .......................................................................................................... 23

4.1 Power ................................................................................................................................................. 23

4.2 Power supply ..................................................................................................................................... 23

4.3 1.8V output ........................................................................................................................................ 24

4.4 Power consumption .......................................................................................................................... 25

Functional interface ................................................................................................................... 28

5.1 Control interface ............................................................................................................................... 28

5.1.1

Power on/off ................................................................................................................................... 28

5.1.2

RESET ............................................................................................................................................ 30

5.2 Network status indicate interface ................................................................................................... 32

5.2.1

Interface status description .......................................................................................................... 32

5.3 (U)SIM card interface ....................................................................................................................... 33

5.3.1

(U)SIM pin definition ..................................................................................................................... 33

5.3.2

(U)SIM interface circuit ................................................................................................................. 34

5.3.3

(U)SIM hot plug ............................................................................................................................. 35

5.3.4

(U)SIM design requirements ....................................................................................................... 36

5.4 USB interface .................................................................................................................................... 37

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5.4.1

USB Pin definition ......................................................................................................................... 37

5.5 UART Interface ................................................................................................................................. 37

5.5.1

UART interface definition ............................................................................................................. 37

5.5.2

UART port application .................................................................................................................. 38

5.6 ADC interface .................................................................................................................................... 39

5.7 PCM interface ................................................................................................................................... 39

5.7.1

Support model ............................................................................................................................... 39

5.7.2

PCM interface definition ............................................................................................................... 40

5.7.3

PCM interface description ............................................................................................................ 40

5.7.4

PCM signal description ................................................................................................................ 40

Low power consumption .......................................................................................................... 42

6.1 Airplane mode ................................................................................................................................... 42

6.2 Sleep mode ....................................................................................................................................... 42

6.2.1

USB Application（nonsupport USB suspend, support VBUS） ................................................ 42

6.2.2

USB application (nonsupport USB suspend, nonsupport VBUS) .......................................... 43

6.2.3

USB application (Supports USB Suspend) ............................................................................... 43

6.2.4

UART application ( WAKEUP_IN pin level control ) ................................................................ 43

6.2.5

UART application ( DTR pin level control ) ............................................................................... 44

6.2.6

ATS24 Command .......................................................................................................................... 44

RF interface .................................................................................................................................. 46

7.1 Operating band ................................................................................................................................. 46

7.2 Output power ..................................................................................................................................... 46

7.3 Receive Sensitivity ........................................................................................................................... 47

7.4 GNSS Receiver ................................................................................................................................. 49

7.4.1

GNSS specification ....................................................................................................................... 49

7.4.2

GNSS observes protocol ............................................................................................................. 49

7.5 Antenna design ................................................................................................................................. 49

7.5.1

Antenna index ................................................................................................................................ 49

7.5.2

Antenna reference design ............................................................................................................ 51

Reliability ...................................................................................................................................... 54

8.1 Limiting voltage range ...................................................................................................................... 54

8.1.1

Absolute voltage range ................................................................................................................. 54

8.1.2

Operating voltage range .............................................................................................................. 54

8.2 Environment temperature range .................................................................................................... 54

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8.3 Environmental reliability requirements .......................................................................................... 55

8.4 ESD characteristics .......................................................................................................................... 55

Structure specification .............................................................................................................. 57

9.1 Product appearance ......................................................................................................................... 57

9.2 Structure dimension ......................................................................................................................... 57

9.3 PCB Soldering Pad and Stencil Design ........................................................................................ 58

9.4 SMT .................................................................................................................................................... 58

9.5 Carrier and storage .......................................................................................................................... 58

Approval ...................................................................................................................................... 59

Appendix ..................................................................................................................................... 60

11.1 GPRS and EGPRS Encoding Scheme ....................................................................................... 60

11.2 Terms and acronyms ...................................................................................................................... 62

11.3 Related Document .......................................................................................................................... 64

11.4 Reference Standards ..................................................................................................................... 64

11.5 Contact ............................................................................................................................................. 65

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Figure Index

Figure 3- 1 Pin Assignment (Top View Diagram) ..................................................................................... 15

Figure 4- 1 Recommend Power Design .................................................................................................... 23

Figure 4- 2 Power Limit ................................................................................................................................ 24

Figure 5- 1 OC Drive Power on Reference Circuit .................................................................................. 28

Figure 5- 2 Button Switch Power on Reference Circuit .......................................................................... 29

Figure 5- 3 Power on Timing ....................................................................................................................... 29

Figure 5- 4 Power off Timing ....................................................................................................................... 30

Figure 5- 5 OC Driven Reset Reference Circuits ..................................................................................... 31

Figure 5- 6 Button Reset Reference Circuits ............................................................................................ 31

Figure 5- 7 Reset Timing ............................................................................................................................. 32

Figure 5- 8 Network Indicate Light Reference Circuits ........................................................................... 33

Figure 5- 9 (U)SIM Card Connector (SIM016-8P-220P) ........................................................................ 34

Figure 5- 10 (U)SIM Card Connector with Detection Signal Reference Circuit .................................. 35

Figure 5- 11 (U)SIM Card Connector without Detection Signal Reference Circuit ............................. 35

Figure 5- 12 UART Level Translate Reference 1 .................................................................................... 38

Figure 5- 13 UART Level Translate Reference 2 .................................................................................... 39

Figure 5- 14 PCM_SYNC Timing ............................................................................................................... 40

Figure 5- 15 PCM_CODEC to NL668-LA Timing ..................................................................................... 41

Figure 5- 16 NL668-LA to PCM_CODEC Timing ..................................................................................... 41

Figure 7- 1 Main and diversity Antenna Reference Circuit ..................................................................... 52

Figure 7- 2 GNSS Antenna Reference Circuit.......................................................................................... 52

Figure 9- 1 Product Appearance ................................................................................................................ 57

Figure 9- 2 Structure Dimension (Unit: mm) ............................................................................................. 57

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Table Index

Table 2- 1 Product Specification ................................................................................................................. 13

Table 3- 1 I/O Description Parameters ...................................................................................................... 16

Table 3- 2 Pin function description ............................................................................................................. 21

Table 4- 1 Power Interface .......................................................................................................................... 23

Table 4- 2 Filter Capacitors Design of Power Supply ............................................................................. 24

Table 4- 3 VDD_EXT Logic Level ............................................................................................................... 25

Table 4- 4 Power Consumption .................................................................................................................. 27

Table 5- 1 Control Signal ............................................................................................................................. 28

Table 5- 2 Power off ..................................................................................................................................... 30

Table 5- 3 Reset ............................................................................................................................................ 30

Table 5- 4 Network Status Indicate ............................................................................................................ 32

Table 5- 5 Network Indicate Light Work Status ........................................................................................ 33

Table 5- 6 (U)SIM Card Pin ......................................................................................................................... 33

Table 5- 7 (U)SIM Card Hot Plug Function Configured .......................................................................... 36

Table 5- 8 USIM_PRESENCE Effective Level Switched ........................................................................ 36

Table 5- 9 USB Pin Definition ..................................................................................................................... 37

Table 5- 10 Main Serial Port ........................................................................................................................ 38

Table 5- 11 Debug Serial Port ..................................................................................................................... 38

Table 5- 12 ADC Pin Definitation ................................................................................................................ 39

Table 5- 13 Support Model of PCM ............................................................................................................ 39

Table 5- 14 PCM Pin Definition .................................................................................................................. 40

Table 5- 15 PCM Interface Description...................................................................................................... 40

Table 5- 16 Codec Timing Parameters ...................................................................................................... 41

Table 6- 1 W_DISABLE# Pin Description ................................................................................................. 42

Table 6- 2 Module Enter Airplane Mode Ways .............................................................................................. 42

Table 7- 1 RF Interface ................................................................................................................................ 46

Table 7- 2 Operating Band .......................................................................................................................... 46

Table 7- 3 Output Power .............................................................................................................................. 47

Table 7- 4 Receive Sensitivity ..................................................................................................................... 48

Table 7- 5 GNSS Specification ................................................................................................................... 49

Table 7- 6 Main Antenna Requirements .................................................................................................... 51

Table 8- 1 Absolute Voltage Range ........................................................................................................... 54

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Table 8- 2 Operating Voltage Range ......................................................................................................... 54

Table 8- 3 Environment Temperature Range ........................................................................................... 55

Table 8- 4 Environmental Reliability Requirements ................................................................................. 55

Table 8- 5 ESD Allowable Discharge Range ............................................................................................ 56

Table 10- 1 Approval .................................................................................................................................... 59

Table 11- 1 GPRS Encoding Scheme........................................................................................................ 60

Table 11- 2 Multilevel Multislot Allocation .................................................................................................. 61

Table 11- 3 EGPRS Modulation and Encoding Method ........................................................................ 61

Table 11- 4 Terms and Acronyms ............................................................................................................... 64

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Introduction

1.1

Document Introduction

This document describes the electrical characteristics, RF performance, structure size, application environment, etc. of NL668-LA module. With the assistance of the document and other instructions, the developers can quickly understand the hardware functions of the NL668-LA module and develop products.

1.2

Safety precautions

By following the safety guidelines below, you can protect the personal safety and help protect the product and work environment from potential damage. Product manufacturers need to communicate the following safety instructions to end users. In case of failure to comply with these safety rules, Fibocom Wireless will not be responsible for the consequences caused by the user’s misuse.

Road safety first! When you drive, do not use the handheld devices even if it has a hand-free feature. Please stop and call!

Please turn off the mobile device before boarding. The wireless feature of the mobile device is not allowed on the aircraft to prevent interference with the aircraft communication system. Ignoring this note may result in flight safety issue or even breaking the law.

When in a hospital or health care facility, please be aware of restrictions on the use of mobile devices. Radio frequency interference may cause medical equipment to malfunction, so it may be necessary to turn off the mobile device.

The mobile device does not guarantee that an effective connection can be made under any circumstances, for example, when there is no prepayment for the mobile device or the (U)SIM is invalid. When you encounter the above situation in an emergency, remember to use an emergency call, while keeping your device turned on and in areas where signal is strong.

Your mobile device receives and transmits RF signals when it is powered on. Radio interference occurs when it is near televisions, radios, computers, or other electronic devices.

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Keep the mobile device away from flammable gases. Turn off the mobile device when near gas stations, oil depots, chemical plants or explosive workplaces. There is a safety hazard in operating electronic equipment in any potentially explosive environment.

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Product Overview

2.1

Product Introduction

The NL668-LA series wireless module is a broadband wireless terminal product applicable to various network formats and multi-bands include TDD-LTE /FDD-LTE /WCDMA /GSM.

2.2

Product Specification

Specification

Operating frequency

LTE FDD: Band 1,2,3,4,5,7,8,12,17,28,66

LTE TDD: Band 38,40

WCDMA/HSPA+: Band 1,2,3,4,5,8

GSM/GPRS/EDGE: 850/900/1800/1900MHz

Data transmission

LTE FDD Rel.9

150Mbps DL/50Mbps UL (Cat 4) LTE Downlink MIMO 2×2,4×2 (support part of R10)

LTE TDD Rel.9

130Mbps DL/30.5Mbps UL (Cat 4) LTE Downlink MIMO 2×2,4×2 (support part of R10)

WCDMA Rel.8 UMTS:384 kbps DL/384 kbps UL

DC-HSDPA+:42MbpsDL (Cat24)/HSUPA:5.76Mbps UL (Cat 6)

GPRS/EDGE Rel.5

GPRS:107kbps DL/85.6kbps UL (multi-slot class 33)

EDGE(E-GPRS):296kbps DL/236.8kbps UL (multi-slot class 33)

Power

3.3V～4.3V (3.8V recommended)

Temperature Normal: -30°C～+75°C

Extended:-40°C～+85°C

Storage:-40°C～+90°C

Power consumption Base current: <2mA

Sleep mode: ≤4mA

Idle mode: <20mA (USB sleep), <30mA (USB wakeup)

Physical characteristics Package: LCC+LGA 144 Pin

Size: (32.0±0.15) mm× (29.0±0.15) mm× (3.2±0.2) mm

Weight: About 5.2g

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Interface

Antenna

Antenna: Main, GNSS, DIV

Functional Interface

(U)SIM 3.0V/1.8V

USB 2.0

Status Indicator

UART x 2, PCM, I2C, SGMII, SPI, SDIO, GPIOs

ADC x 2

Software

Protocol Stack

Embedded TCP/IP and UDP/IP protocol stack

AT Command

3GPP TS 27.007 and 27.005, and proprietary FIBOCOM AT

Firmware update

USB (UART does not support DOWNLOAD)

Voice service

VoLTE, HR, FR, EFR, AMR, DTMF, Caller ID, Call Transfer, Call Hold, Call Waiting and Multi-Talk, etc.

SMS

point-to-point MO, MT; cell broadcast; support Text and PDU modes

Table 2- 1 Product Specification

Note:

When the temperature is beyond the normal operating temperature range (-30 °C to + 75 °C), the RF performance of the module may slightly exceed the 3GPP specification.

2.3

Functional

Functional of the NL668-LA series module, including baseband and RF features. Baseband includes:



PMIC



MCP



USB, (U)SIM, PCM, I2C, SPI, UART, SGMII, SDIO, GPIOs



GSM/CDMA/EVDO/WCDMA/TD-SCDMA/LTE TDD/LTE FDD controller

RF includes:



RF Transceiver



RF PA



RF filter



Antenna

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2.4

Evaluation Board

Fibocom provide EVK-GT8230-NL, ADP-NL668-LA evaluation board to convenient module's debug and use.

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Pin Description

3.1

Pin Assignment

The NL668-LA series module is available in 144 pins. The numbers of the LCC pins are 80, and the LGA pins are 64. the top view of the pin assignment is shown as follow figure:

Figure 3- 1 Pin Assignment (Top View Diagram)

Note: “85 ~112” is the thermal pin, and the module is grounded internally. It is recommended that the

heat sink pad is reserved for PCB packaging and welded.

3.2

Pin function

Symbol

Description

IO Input/Output

DI Digital input

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Symbol

Description

Digital output

Power input

Power output

Analog input

Analog output

OD Open drain

OC Open collector

Table 3- 1 I/O Description Parameters

The pin function description of NL668-LA series module is shown as table 3-2:

Pin Num

Pin Name

I/O

Level

Description

WAKEUP_IN

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

External device wake-up module, low active by default. with software programmable option

AP_READY

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

Reserved

3 RESERVED

- - Reserved

W_DISABLE#

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

Module flight mode control. pull up by default. Pull down this pin, module enter airplane mode

NET_MODE

VOLmax=0.45V VOHmin=1.35V

Module network state indicate (by default)

NET_STATUS

max=0.45V

VOHmin=1.35V

Module network state indicate 7 VDD_EXT

1.8V

Module digital level, 1.8V output, 80mA

8 GND G -

Ground

9 GND G -

Ground

GND G -

Ground

DBG_RXD

I VILmin=-0.3V

Debug serial port receive data

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Pin Num

Pin Name

I/O

Level

Description

VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

12 DBG_TXD

VOLmax=0.45V VOHmin=1.35V

Debug serial port transmit data

USIM_PRESENCE

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

(U)SIM card hot plug detection

USIM_VDD

For 1.8V (U)SIM: Vmax=1.9V Vmin=1.7V For 3.0V (U)SIM: Vmax=3.05V Vmin=2.7V IOmax=50mA

(U)SIM power, identify 1.8V or 3V (U)SIM card automatically

USIM_DATA

For 1.8V (U)SIM: VILmax=0.6V VIHmin=1.2V VOLmax=0.45V VOHmin=1.35V For 3.0V (U)SIM: VILmax=1.0V VIHmin=1.95V VOLmax=0.45V VOHmin=2.55V

(U)SIM data signal

USIM_CLK

For 1.8V (U)SIM: VOLmax=0.45V VOHmin=1.35V For 3.0V (U)SIM: VOLmax=0.45V VOHmin=2.55V

(U)SIM clock signal 17

USIM_RST

For 1.8V (U)SIM: VOLmax=0.45V VOHmin=1.35V For 3.0V (U)SIM: VOLmax=0.45V

(U)SIM reset signal

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Pin Num

Pin Name

I/O

Level

Description

VOHmin=2.55V

NC - -

GND G -

Ground

20 RESET_N

VIHmax=2.1V VIHmin=1.3V VILmax=0.5V

Module reset signal, active low, no need pull up externally

PWRKEY

VIHmax=2.1V VIHmin=1.3V VILmax=0.5V

Module power on/off signal, active low, no need pull up externally. Because the internal diode drop. the voltage of the pin is 0.8V after power the module.

GND G -

Ground

SD_INS_DET

I - Reserved

PCM_IN

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

PCM input signal 25 PCM_OUT

VOLmax=0.45V VOHmin=1.35V

PCM output signal

PCM_SYNC

VOLmax=0.45V VOHmin=1.35V VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

PCM synchronization signal

PCM_CLK

VOLmax=0.45V VOHmin=1.35V VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

PCM clock signal

SDC2_DATA3

IO -

Reserved

SDC2_DATA2

IO -

Reserved

SDC2_DATA1

IO -

Reserved

SDC2_DATA0

IO -

Reserved

SDC2_CLK

O - Reserved

SDC2_CMD

IO -

Reserved

VREG_L13_2P85

PO -

Reserved

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Pin Num

Pin Name

I/O

Level

Description

ANT_DIV

I - Diversity antenna

GND

- - Ground

SPI_CS_N

O - Reserved

SPI_MOSI

O - Reserved

SPI_MISO

I - Reserved

SPI_CLK

O - Reserved

I2C_SCL

OD -

I2C interface clock signal

I2C_SDA

OD -

I2C interface data signal

NC - -

ADC1

I - Analog to digital converter interface1

ADC0

I - Analog to digital converter interface 0

GND G -

Ground

ANT_GNSS

I - GNSS antenna

GND

- - Ground

ANT_MAIN

IO -

Main antenna

GND G -

Ground

GND G -

Ground

GND G -

Ground

GND G -

Ground

GND G -

Ground

NC - -

GND G -

Ground

57 VBAT_RF

Vmax=4.3V Vmin=3.3V Vnorm=3.8V

RF power input (3.3V~4.3V)

58 VBAT_RF

Vmax=4.3V Vmin=3.3V Vnorm=3.8V

RF power input (3.3V~4.3V)

59 VBAT_BB

Vmax=4.3V Vmin=3.3V Vnorm=3.8V

Baseband power input（3.3V~4.3V）

60 VBAT_BB

Vmax=4.3V Vmin=3.3V Vnorm=3.8V

Baseband Power Input (3.3V~4.3V) 61 STATUS

VOHmin=1.35V VOLmax=0.45V

Module network state indicate

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Pin Num

Pin Name

I/O

Level

Description

62 RI O

VOLmax=0.45V VOHmin=1.35V

Module output ring indicator

63 DCD

VOLmax=0.45V VOHmin=1.35V

Module output data carrier detection

64 CTS

VOLmax=0.45V VOHmin=1.35V

Request to send

RTS

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

Clear to send

DTR

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

Data ready. The control of the sleep mode 67 TXD

VOLmax=0.45V VOHmin=1.35V

Transmit data

RXD

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

Receive data 69 USB_DP

Conform to USB2.0 standard specification

USB differential data bus (+)

70 USB_DM

Conform to USB2.0 standard specification

USB differential data bus (-)

71 USB_VBUS

Vmax=5.25V Vmin=3.0V Vnorm=5.0V

USB plug detection 72,76

GND G -

Ground

73,82

RESERVED

- - Reserved

74,75,77 ~81,83,8 4

NC -

85~112

GND G

GND

113

NC - -

114

NC - -

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Pin Num

Pin Name

I/O

Level

Description

115

USB_BOOT

VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V

Emergency download, active high, recommended to reserve test point 116

NC - -

117

RESERVED

- - Reserved

118

WLAN_SLP_CLK

Reserved

119

EPHY_RST_N

O - Reserved

120

EPHY_INT_N

I - Reserved

121

SGMII_MDATA

IO -

Reserved

122

SGMII_MCLK

O - Reserved

123

SGMII_TX_M

O - Reserved

124

SGMII_TX_P

O - Reserved

125

SGMII_RX_P

I - Reserved

126

SGMII_RX_M

I - Reserved

127

PM_ENABLE

O - Reserved

128

VREG_L5_UIM2

PO -

Reserved

129

SDC1_DATA3

IO -

Reserved

130

SDC1_DATA2

IO -

Reserved

131

SDC1_DATA1

IO -

Reserved

132

SDC1_DATA0

IO -

Reserved

133

SDC1_CLK

Reserved

134

SDC1_CMD

O - Reserved

135

WAKE_WLAN

Reserved

136

WLAN_EN

O - Reserved

137

COEX_UART_RXD

I - Reserved

138

COEX_UART_TXD

O - Reserved

139

BT_EN

O - Reserved

140

NC - -

141

RESERVED

- -

Reserved

142

RESERVED

- -

Reserved

143

RESERVED

- -

Reserved

144

RESERVED

- -

Reserved

Table 3- 2 Pin function description

Note:

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Keep the unused pins floating. The reserved pins are in development

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Electrical characteristics

4.1

Power

Table 4-1 show the power interface of NL668-LA series module.

Pin Name

I/O

Description

VBAT_RF

57,58

Module power supply, 3.3V~4.3V, typical value 3.8V

VBAT_BB

59,60

Module power supply, 3.3V~4.3V, typical value 3.8V

VDD_EXT

PO 7

Module digital voltage output, 1.8V, 80mA

GND

8,9,10,19,22,36,46,48,50~ 54,56,72,76,85~112

All GND pins must be grounded

Table 4- 1 Power Interface

Note:

In the rest of the document, VBAT includes VBAT_BB and VBAT_RF.

4.2

Power supply

The NL668-LA series module needs to be powered by the VBAT pin. The recommend power design is shown in Figure 4-1:

Figure 4- 1 Recommend Power Design

Table 4-1 is the filter capacitors design of power supply:

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Recommended capacitor

Application

Description

220uF x 2

Regulating capacitor

Reduce power fluctuations during module operation, requiring low ESR Capacitor LDO or DCDC power requires not less than 440uF capacitor Battery power can be properly reduced to 100uF ~ 220uF capacitor

1uF,100nF

Digital signal noise

Filter clock and digital signal interference

39pF,33pF

700, 850/900 MHz bands

Filter low band RF interference

18pF,8.2pF,6.8pF

1700/1800/1900,2100/2300,2500/ 2600MHz bands

Filter middle/high band RF interference

Table 4- 2 Filter Capacitors Design of Power Supply

The power stability can ensure the normal operation of NL668-LA module. The power supply ripple limit

for the module is no more than 300mV (the circuit ESR < 100mΩ) requires special attention when design

circuit. When the module is operating in GSM mode (Burst transmit), the maximum operating current can reach 3A, and the power voltage needs to be at least 3.3V. Otherwise, the module may power off or restart. The power limit is shown in Figure 4-2:

4.3

1.8V output

Figure 4- 2 Power Limit

The NL668-LA series module outputs a 1.8V voltage through the VDD_EXT for the use of the internal digital circuit of module. The voltage is the logic level of the module and can be used to indicate module Power on/off, or for external low current (<80mA) circuits. leave the signal floating if no use. The logic

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level of VDD_EXT is defined as follows:

Parameter

Minimum

Typical

Maximum

Unit

VDD_EXT

1.71

1.8

1.89 V

Table 4- 3 VDD_EXT Logic Level

4.4

Power consumption

The power consumption of NL668-LA series module measured at 3.8V power supply is shown as follow table, for USB sleep and USB wakeup AT commands please refer to 6.1.2 section:

Parameter

Mode

Condition

Average Current Typ. (mA)

off

Power off

Module power off

0.015

idle

Radio off

GSM

MFRMS=5(USB sleep)

MFRMS=5 (USB wakeup)

WCDMA DRX=8(USB sleep)

DRX=8(USB wakeup)

LTE FDD Paging cycle #64 frames (USB sleep)

Paging cycle #64 frames (USB wakeup)

LTE TDD Paging cycle #64 frames (USB sleep)

Paging cycle #64 frames (USB wakeup)

Radio off AT+CFUN=0,0 (USB sleep)

AT+CFUN=0,0 (USB wakeup)

sleep

GSM

MFRMS=5 (USB sleep)

3 WCDMA

DRX=8 (USB sleep)

LTE FDD Paging cycle #64 frames (USB sleep)

3 Paging cycle #128 frames (USB sleep)

3 Paging cycle #256 frames (USB sleep)

LTE TDD Paging cycle #64 frames (USB sleep)

3 Paging cycle #128 frames (USB sleep)

3 Paging cycle #256 frames (USB sleep)

GSM-RMS

GSM GSM850 PCL5

260

EGSM900 PCL5

260

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Parameter

Mode

Condition

Average Current Typ. (mA)

DCS1800 PCL0

200

PCS1900 PCL0

200

GPRS-RMS

CS4

GPRS

GPRS Data transfer GSM850; PCL=5; 1Rx/4Tx

570

GPRS Data transfer GSM900; PCL=5; 1Rx/4Tx

570

GPRS Data transfer DCS1800; PCL=0; 1Rx/4Tx

430

GPRS Data transfer PCS1900; PCL=0; 1Rx/4Tx

430

EGPRS-RMS

MCS9

EDGE

EDGE Data transfer GSM850; PCL=8; 1Rx/4Tx

460

EDGE Data transfer GSM900; PCL=8; 1Rx/4Tx

460

EDGE Data transfer DCS1800; PCL=2; 1Rx/4Tx

440

EDGE Data transfer PCS1900; PCL=2; 1Rx/4Tx

440

WCDMA-RMS

WCDMA

WCDMA Data transfer Band 1 @+23.5dBm

650

WCDMA Data transfer Band 2 @+23.5dBm

620

WCDMA Data transfer Band 3 @+23.5dBm

700

WCDMA Data transfer Band 4 @+23.5dBm

700

WCDMA Data transfer Band 5 @+23.5dBm

550

WCDMA Data transfer Band VIII@+23.5dBm

570

LTE-RMS

LTE FDD

LTE FDD Data transfer Band 1 @+23dBm

650

LTE FDD Data transfer Band 2 @+23dBm

650

LTE FDD Data transfer Band 3 @+23dBm

730

LTE FDD Data transfer Band 4 @+23dBm

700

LTE FDD Data transfer Band 5 @+23dBm

580

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Parameter

Mode

Condition

Average Current Typ. (mA)

LTE FDD Data transfer Band 7 @+23dBm

750

LTE FDD Data transfer Band 8 @+23dBm

580

LTE FDD Data transfer Band 12 @+23dBm

650

LTE FDD Data transfer Band 17 @+23dBm

670

LTE FDD Data transfer Band 28 @+23dBm

680

LTE FDD Data transfer Band 66 @+23dBm

720

LTE TDD LTE TDD Data transfer Band 38

@+23dBm

400

LTE TDD Data transfer Band 40 @+23dBm

420

Table 4- 4 Power Consumption

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Functional interface

5.1

Control interface

Control interfaces used for module power on/off and reset operations. The pin definitions are as follows:

Pin name

I/O

Pin Num

Description

RESET_N

When the module in operating mode, pull down RESET_N 700ms~1s, and then release it, the module is reset

PWRKEY

When module in power off mode, pull down PWRKEY 100ms~2s, and release it, the module will power on; When module in operating mode, pull down PWRKEY 3s~8s, and then release it, the module will power off

Table 5- 1 Control Signal

5.1.1

Power on/off

5.1.1.1

Power on

When NL668-LA series module in power off mode, pull down PWRKEY pin 100ms~2s, the module will power on, it is recommended to use OC/OD drive circuit to control PWRKEY pin. The OC drive reference circuit is shown as follows:

Figure 5- 1 OC Drive Power on Reference Circuit

The other way to control PWRKEY pin is use a button switch, a TVS should located near the button (recommended ESD9X5VL-2/TR) for ESD protection. The button switch power on reference circuit is shown as follows:

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Figure 5- 2 Button Switch Power on Reference Circuit

Figure 5-3 is power on timing.

Figure 5- 3 Power on Timing

Note:

Before pull down PWRKEY pin, the Voltage of VBAT must be stable, recommended time interval between VBAT enable and pull down PWRKEY pin at least 30ms.

5.1.1.2

Power off

The module supports three power off methods as table 5-2.

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Power off mode

Power off methods

Applicable scenarios

Low-voltage power off

When VBAT voltage is low or power down, the module will power off

The module does not power off through normal process, i.e. does not logout from the base station

Hardware power off

Pull down PWRKEY 3s~8s

Hardware normal power off

AT power off

AT+ CPWROFF

Software normal power off

Table 5- 2 Power off

Note:

When module at operating mode, please do not cut off module power supply to avoid

damage internal flash. Recommended by PWRKEY pin or AT commands power off module, then cut off power supply.

When power off by AT commands, please don’t pull down PWRKEY pin, otherwise module will power on again automatically. The power off timing is shown as follows:

5.1.2 RESET

Figure 5- 4 Power off Timing

The module supports two modes to reset: hardware reset and software reset.

Reset mode

Reset method

Hardware reset

Pull down RESET_N pin 700s~1s, then release it

Software reset

Sent AT commands AT+RESET

Table 5- 3 Reset

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Clients can control RESET_N pin by two modes: OC/OD drive circuits and button switch, corresponding reference circuit as Figure 5-5 and Figure 5-6:

Figure 5- 5 OC Driven Reset Reference Circuits

Figure 5- 6 Button Reset Reference Circuits

The reset timing is shown as follows:

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Figure 5- 7 Reset Timing

5.2 Network status indicate interface

NL668-LA series module provides three network status indicate pins. Pin 5 is network status indicator by default, AT commands AT+LEDCFG can switch to pin6 or pin61, table 5-4 is the pin definition.

Table 5- 4 Network Status Indicate

5.2.1 Interface status description

Network status indicate pins are used to driven indicate light and describe module’s network status,

NL668-LA series module network indicates light work status description as follow table:

PIN Name

I/O

PIN Num.

Description

NET_MODE

O 5 Network status indicator (by default)

NET_STATUS

O 6 Network status indicator

STATUS

O 61

Network status indicator

Mode

Module Network indicator pin status

Indicator light flash/off status

Description

600ms High/600ms Low

Flash 600ms on /600ms off

No SIM card Request SIM PIN Registering network (T<15S) Register network failed

3000ms High /75ms Low

Slow flash 3000ms on/75ms off

Standby 3 75ms High / 75ms Low

Speed flash

Data link established

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Mode

Module Network indicator pin status

Indicator light flash/off status

Description

75ms on/75ms off

4 Low

Off

Voice call

5 High

Sleep

Table 5- 5 Network Indicate Light Work Status

NL668-LA series module network indicates light reference design circuits shown as follows:

Figure 5- 8 Network Indicate Light Reference Circuits

5.3

(U)SIM card interface

NL668-LA series module has built-in (U)SIM card interface, and supports 1.8V and 3.0V (U)SIM card.

5.3.1

(U)SIM pin definition

(U)SIM pin definition is shown in the following table:

Pin name

I/O

Pin Num

Description

USIM_PRESENCE

I 13

Detect (U)SIM card for Hot-swap

USIM_VDD

(U)SIM Power

USIM_DATA

(U)SIM DATA

USIM_CLK

O 16

Clock Signal

USIM_RESET

O 17

Reset Signal

Table 5- 6 (U)SIM Card Pin

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5.3.2

(U)SIM interface circuit

5.3.2.1

(U)SIM card connector with card detection signal

(U)SIM circuit design requires use (U)SIM card connector, recommend chose with card detect signal that support card hot swap function (Fibocom recommend: SIM016-8P-220P).

Figure 5- 9 (U)SIM Card Connector (SIM016-8P-220P)

SIM016-8P-220P card connector, DET and POL are short connected when the card is inserted; DET and POL are disconnected when there is no card. The following is the reference design circuit, (U)SIM card insert, USIM_PRESENCE pin is high level; (U)SIM card pull out, USIM_PRESENCE pin is low level.

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Figure 5- 10 (U)SIM Card Connector with Detection Signal Reference Circuit

5.3.2.2

(U)SIM card connector without detection signal

If use (U)SIM card connector without detection signal USIM_ PRESENCE pin must keep floating.

Figure 5- 11 (U)SIM Card Connector without Detection Signal Reference Circuit

5.3.3

(U)SIM hot plug

NL668-LA series module support (U)SIM hot plug function, it determines the insertion and removal of (U)SIM card by detect the USIM_ PRESENCE pin state.

The card hot plug function can be configured by the “AT+MSMPD” command, and the AT commands are

shown in the following table:

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AT command

(U)SIM card hot plug detection

Function description

AT+MSMPD=1

Enabled

(U)SIM card hot plug detection is enabled by default. The module determines the insertion and removal of (U)SIM card by detect the USIM_ PRESENCE pin state

AT+MSMPD=0

Disabled

(U)SIM card hot plug detection function is disabled The module read the (U)SIM card when module power on, and does not detect the USIM_PRESENCE state

Table 5- 7 (U)SIM Card Hot Plug Function Configured

After enabled the hot plug detection function of the (U)SIM card, if USIM_PRESENCE is in high level, the module will detect the (U)SIM card insertion and execute card initialization program. After reading the (U)SIM card information, the module will register network. When the USIM_PRESENCE is in low level, the module detects (U)SIM card is removed, and it will not read the (U)SIM card.

Note:

The USIM_PRESENCE pin active high by default, and can be switched to active low by AT command.

Table 5- 8 USIM_PRESENCE Effective Level Switched

5.3.4

(U)SIM design requirements

(U)SIM card circuit design shall meet EMC standards and ESD requirements, and at the same time, shall improve anti-interference ability to ensure that the (U)SIM card can work stably. The design needs to strictly observe the following rules:

⚫

(U)SIM card connector is placed as close to the module as possible, away from the RF antenna, DCDC power, clock signal lines and other strong interference sources;

⚫

Adopt the (U)SIM card connector with metal shield shell to improve anti-interference ability;

⚫

The length of cable from the module to the (U)SIM card connector shall not exceed 100mm. Longer cable reduces signal quality.

⚫

USIM_CLK and USIM_DATA signals are ground isolated to avoid mutual interference. If it is difficult to do so, (U)SIM signal needs to be ground protected as a set;

AT command

Function description

AT+GTSET=” SIMPHASE”,1

Default, high level detect

AT+GTSET=” SIMPHASE”,0

Low level detect

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⚫

The filter capacitor and ESD device of (U)SIM card signal cable should place close to the (U)SIM card connector.

⚫

Please select equivalent capacitor is 22pF~33pF for ESD device.

⚫

USIM_DATA should pull up to USIM_VDD with a 10K resistor.

5.4

USB interface

5.4.1

USB Pin definition

Pin name

I/O

Pin Num.

Description

USB_DP

USB differential data bus D+

USB_DM

USB differential data bus D-

USB_VBUS

USB Plug detect

Table 5- 9 USB Pin Definition

For more information about the USB 2.0 specification, please refer to http://www.usb.org/home

Note:

Since the module supports USB 2.0 High-Speed, TVS tube equivalent capacitance on the USB_DM/DP differential signal cable is required to be less than 1pF, and a 0.5pF capacitance TVS is recommended. Connect a 0-ohm resistor to USB_DM / DP differential line to help analyze problems. USB_DM and USB_DP are high-speed differential signal cables, can achieve the maximum transmission rate of 480Mbits/s, and must follow the rules below in PCB Layout:



USB_DM and USB_DP signal cable’s control differential impedance is 90 ohm



USB_DM and USB_DP signal cables shall be parallel and equal in length, and avoid the

right-angle route;



USB_DM and USB_DP signal cables are routed on the signal layer closest to the ground layer,

and the cables shall be grounded;

5.5

UART Interface

5.5.1

UART interface definition

NL668-LA series module has two serial ports: the main serial port and debug serial port. The main serial ports support 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps, 230400bps baud rate. The default baud rate is 115200bps, used for data transmission and AT command transmission. Debug serial port support 115200bps baud rate for FIBOCOM internal debug. Table 5-8 and table 5-9 are the pin definition of main serial port and debug serial port.

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Pin Name

I/O

Pin Num

Description

RI O

Ring indicator

DCD O

Data carrier detection

CTS O

Request to send

RTS

I 65

Clear to send

DTR

I 66

Data ready, sleep mode control

TXD O

Module Transmit data

RXD

I 68

Module Receive data

Table 5- 10 Main Serial Port

Pin Name

I/O

Pin Num

Description

DBG_RXD

I 11

Module Receive data

DBG_TXD

O 12

Module Transmit data

Table 5- 11 Debug Serial Port

5.5.2

UART port application

The serial port level of NL668-LA series module is 1.8V, if the level of the client host system is 3.3V or other, level translator needed between the module and the host. The reference design circuit of level

translator is shown as follows:

Figure 5- 12 UART Level Translate Reference 1

The other level translator circuit is shown as Figure 5-13, The rest input and output circuit design of dotted line please refer to solid line part, but pay attention to signal connection direction.

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Figure 5- 13 UART Level Translate Reference 2

Note:

Level translate circuits is not suitable for applications of baud rates above 460Kbps.

5.6

ADC interface

NL668-LA series module support two channels ADC interface. Use AT+TADC command can read the value of ADC interface. The voltage range of ADC interface is 0.3V~VBAT_BB.

5.7

PCM interface

Table 5- 12 ADC Pin Definitation

NL668-LA series module provides a PCM interface for communication with digital audio devices such as an external CODEC.

5.7.1

Support model

Product model

Description

NL668-LA

Support

Table 5- 13 Support Model of PCM

PIN Name

I/O

Pin Num.

Description

ADC0

I 45

Analog to digital converter interface 0

ADC1

I 44

Analog to digital converter interface 1

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5.7.2

PCM interface definition

Pin Name

I/O

Pin Num.

Description

PCM_IN

I 24

PCM data input

PCM_OUT

O 25

PCM data output

PCM_SYNC

PCM data synchronous signal

PCM_CLK

PCM clock

Table 5- 14 PCM Pin Definition

5.7.3

PCM interface description

Pin Name

Frequency.

Duty Cycle

Coded Format

Operating Mode

Description

PCM_CLK

2.048MHz

50%

16bit Liner mono

Module

serves

as master

PCM CLK

PCM_OUT

- - PCM Output

PCM_IN

- - PCM Input

PCM_SYNC

8KHz

Short pulse

PCM Synchronous Signal

(Falling

edge sampling)

Table 5- 15 PCM Interface Description

NL668-LA series module adopts the above configuration by default, any adjustment please contact Fibocom Wireless technical support.

5.7.4

PCM signal description

The PCM signal of NL668-LA series module adopts domestic mainstream Europe E1 standard. PCM_CLK frequency is 2.048MHz clock in 16bit linear format encoding. PCM_SYNC is a 8kHz burst (488nS).

Figure 5- 14 PCM_SYNC Timing

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Figure 5- 15 PCM_CODEC to NL668-LA Timing

Figure 5- 16 NL668-LA to PCM_CODEC Timing

Parameter

Min

Typ

Max

Unit

t(sync)

PCM_SYNC cycle time

–

125 –

μs

t(synca)

PCM_SYNC asserted time

–

488 –

t(syncd)

PCM_SYNC deasserted time

–

124.5

–

μs

t(clk)

PCM_CLK cycle time

–

488 –

t(clkh)

PCM_CLK high time

–

244 –

t(clkl)

PCM_CLK low time

–

244 –

t(susync)

PCM_SYNC offset time to PCM_CLK falling

–

122 –

t(sudin)

PCM_DIN setup time to PCM_CLK falling

60 – –

t(hdin)

PCM_DIN hold time after PCM_CLK falling

10 – –

t(pdout)

Delay from PCM_CLK rising to PCM_DOUT valid

–

60 ns

t(zdout)

Delay from PCM_CLK falling to PCM_DOUT high impedance

–

160

–

Table 5- 16 Codec Timing Parameters

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6 Low power consumption

6.1

Airplane mode

W_DISABLE# Pin Description:

Pin name

I/O

Pin Num.

Description

W_DISABLE#

I 4 Module airplane mode control

Table 6- 1 W_DISABLE# Pin Description

NL668-LA series module supports two ways to enter airplane mode:

Hardware I/O interface button control

First send “AT+WDISABLEEN=1” to enable W_DISABLE#

pin function. Pull high or float W_DISABLE# pin (pull high by default), module enter normal mode, pull it down, module enter airplane mode.

AT command control

AT+CFUN=4--module enter airplane mode AT+CFUN=1--module enter normal mode

6.2

Sleep mode

Table 6- 2 Module Enter Airplane Mode Ways

6.2.1

USB Application（nonsupport USB suspend, support VBUS）

If the host nonsupport USB suspend function, the module can enter sleep mode by disconnect USB_VBUS from the external control circuit:

Sleep:

Send AT+GTUSBDETECTEN=1 to enable USB plug detect function.

AT+GTLPMMODE=1,X command to set the WAKEUP_IN pin’s level of control module enter sleep mode. Reset module, command effective. (X=0, WAKEUP_IN pin is high level, module enter sleep mode; X=1, WAKEUP_IN pin is low level, module enter sleep mode) AT+CSCLK=1 command to enable sleep function. AT+GTUSBSLEEPEN=1,0 command to set USB sleep mode. Draw out the USB cable or disable the USB HUB controller, module enter sleep mode.

Wake up:

Plug in USB cable or enable the USB HUB controller can wake up the module.

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6.2.2

USB application (nonsupport USB suspend, nonsupport VBUS)

If the host nonsupport USB suspend and nonsupport VBUS function, the module can enter sleep mode by disconnect USB_VBUS from the external control circuit:

Sleep:

Send AT+GTLPMMODE=1,X command to set the WAKEUP_IN pin’s level of control module enter sleep

mode. Reset module, command effective. (X=0, WAKEUP_IN pin is high level, module enter sleep mode; X=1, WAKEUP_IN pin is low level, module enter sleep mode) AT+CSCLK=1 command to enable sleep function. AT+GTUSBSLEEPEN=1,1 command to set USB sleep mode Draw out the USB cable or disable the USB HUB controller, module enter sleep mode.

Wake up:

Plug in USB cable or enable the USB HUB controller can wake up the module.

6.2.3

USB application (Supports USB Suspend)

If the host support USB Suspend/Resume. Setting USB sleep in Linux system.

Sleep:

Send AT+GTLPMMODE=1,X command to set the WAKEUP_IN pin’s level of control module enter sleep

mode. Reset module, command effective. (X=0, WAKEUP_IN pin is high level, module enter sleep mode; X=1, WAKEUP_IN pin is low level, module enter sleep mode) AT+CSCLK=1 command to enable sleep function. AT+GTUSBSLEEPEN=0,0 command to set USB sleep mode In Linux system, set the level and control of USB device as auto to suspend the devices of module. Standing the module and host about 2 seconds, the module can enter suspend mode automatically.

Wake up:

Any operation of USB can wake up the module from sleep mode.

6.2.4

UART application ( WAKEUP_IN pin level control )

When host and module connected through UART, use the following steps to make the module enter

Sleep:

Sent AT+GTLPMMODE=1,X command to set et the WAKEUP_IN pin’s level of control module enter sleep mode. Reset module, command effective. (X=0, WAKEUP_IN pin is high level, module enter sleep mode;

X=1, WAKEUP_IN pin is low level, module enter sleep mode)

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AT+GTUSBSLEEPEN=2,X command to disable USB function (X can be 0 or 1) AT+CSCLK=1 command to enable sleep function.

Wake up:

The level of WAKEUP_IN pin contrary with that when the module enter sleep mode, module allow be waked up. (X=0, WAKEUP_IN pin is low level, wake up module;

X=1, WAKEUP_IN pin is high level, wake up module)

6.2.5

UART application ( DTR pin level control )

When host and module connected through UART, use the following steps can make the module enter

Sleep:

Send AT+GTLPMMODE=2,X command to set the DTR set pin’s level of control module enter sleep

mode. Reset module, command effective. (X=0, DTR pin is high level, module enter sleep mode; X=1, DTR pin is low level, module enter sleep mode) AT+GTUSBSLEEPEN=2,X command to disable USB function (X can be 0 or 1)

AT+CSCLK = 1 command to enable sleep function.

Wake up:

The level of DTR pin contrary with that when the module enter sleep mode, module allow be wake up. (X=0, DTR pin is low level, wake up module; X=1, DTR pin is high level, wake up module)

6.2.6

ATS24 Command

ATS24 command can also make module enter sleep mode.

Sleep:

Send AT+GTLPMMODE=0 Reset module, command effective. ATS24=X command to into sleep after X seconds. (X is nonzero integer) AT+GTUSBSLEEPEN=2,X command to disable USB function (X can be 0 or 1)

Wake up:

Send the AT command fast by UART serial port can wake up the module. If don’t send AT commands

between X seconds, module will try to enter sleep mode.

Note:

Since the level of UART sleep power is different, power consumption of use ATS24 command to enter sleep mode is higher than that use Pin control to enter sleep mode.

When ATS24 command enter sleep mode countdown, it isn’t enter sleep mode once overtime

strictly, but try to enter sleep mode. If system don’t support after overtime, it will timekeeping

automatically. If you want to use the RI signal to represent the state of the module, please refer to the

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AT+GTWAKE command in FIBOCOM AT Commands User Manual_Sleep. For more sleep command description, please refer to 《FIBOCOM AT Commands User Manual_Sleep》

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7 RF interface

NL668-LA series module has ANT_MAIN, ANT_DIV and ANT_ GNSS three antenna interfaces, its pin definition show as table 7-1:

7.1

Operating band

Table 7- 1 RF Interface

Operating Band

Description

Mode

Tx (MHz)

Rx (MHz)

Band 1

IMT 2100MHz

LTE FDD/WCDMA

1920 - 1980

2110 - 2170

Band 2

IMT 1900

LTE FDD/WCDMA/GSM

1850-1910

1930-1990

Band 3

DCS 1800MHz

LTE FDD/WCDMA/GSM

1710 - 1785

1805 - 1880

Band 4

IMT 2100

LTE FDD/WCDMA

1710-1755

2110-2155

Band 5

CLR 850MHz

LTE FDD/WCDMA/GSM

824 - 849

869 - 894

Band 7

IMT 2600

LTE FDD

2500-2570

2620-2690

Band 8

E-GSM 900MHz

LTE FDD/WCDMA/GSM

880 - 915

925 - 960

Band 12

IMT 700

LTE FDD

699-716

729-746

Band 17

IMT 700

LTE FDD

704-716

734-746

Band 28

IMT 700

LTE FDD

703-748

758-803

Band 66

IMT 2100MHz

LTE FDD

1710-1780

2110-2200

Band 38

IMT-E 2600MHz

LTE TDD

2570 - 2620

Band 40

IMT 2300MHz

LTE TDD

2300 - 2400

7.2

Output power

Table 7- 2 Operating Band

The Output power of NL668-LA series module show as follows:

Mode

Band

Tx Power(dBm)

Note

GSM

GSM 850

32.5±1

Pin Name

I/O

Pin Num.

Description

ANT_DIV

I 35

Diversity antenna

ANT_GNSS

I 47

GPS antenna

ANT_MAIN

Main antenna

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Mode

Band

Tx Power(dBm)

Note

GSM 900

32.5±1

DCS 1800

29.5±1

PCS 1900

29.5±1

WCDMA

Band Ⅰ

23.5±1

Band Ⅱ

23.5±1

Band Ⅲ

23.5±1

Band Ⅳ

23.5±1

Band Ⅴ

23.5±1

Band VIII

23.5±1

LTE FDD

Band 1

23±1

10MHz Bandwidth, 1 RB

Band 2

23±1

10MHz Bandwidth, 1 RB

Band 3

23±1

10MHz Bandwidth, 1 RB

Band 4

23±1

10MHz Bandwidth, 1 RB

Band 5

23±1

10MHz Bandwidth, 1 RB

Band 7

23±1

10MHz Bandwidth, 1 RB

Band 8

23±1

10MHz Bandwidth, 1 RB

Band 12

23±1

10MHz Bandwidth, 1 RB

Band17

23±1

10MHz Bandwidth, 1 RB

Band 28

23±1

10MHz Bandwidth, 1 RB

Band 66

23±1

10MHz Bandwidth, 1 RB

LTE TDD

Band 38

23±1

10MHz Bandwidth, 1 RB

Band 40

23±1

10MHz Bandwidth, 1 RB

Table 7- 3 Output Power

7.3

Receive Sensitivity

Mode

Band

Rx Sensitivity(dBm)

Typ.

RxD Sensitivity(dBm)

Typ.

GSM

GSM 850

-109

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Mode

Band

Rx Sensitivity(dBm)

Typ.

RxD Sensitivity(dBm)

Typ.

GSM 900

-109

DCS 1800

-108.5

PCS 1900

-108.5

WCDMA

Band Ⅰ

-109

Band Ⅱ

-109.5

Band Ⅲ

-109.5

Band Ⅳ

-109

Band Ⅴ

-110

Band VIII

-110

LTE FDD

Band 1

-97.5

-98

Band 2

-97.5

-98.5

Band 3

-98

-98.5

Band 4

-97

-98.5

Band 5

-98.5

-99.5

Band 7

-96

-97.5

Band 8

-98

-99.5

Band 12

-97.5

-98

Band 17

-97.5

-98

Band 28

-97.5

-97

Band 66

-97.5

-98.5

LTE TDD

Band 38

-97.5

-96.5

Band 40

-97.5

-96.5

Table 7- 4 Receive Sensitivity

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7.4

GNSS Receiver

7.4.1

GNSS specification

NL668-LA series module support GNSS function and adopts Qualcomm Gen8 technology, its specification show as follows:

Table 7- 5 GNSS Specification

7.4.2

GNSS observes protocol

NL668-LA series module adopt NMEA-0183 protocol.

7.5

Antenna design

7.5.1

Antenna index

Antenna efficiency

Antenna efficiency is the ratio of antenna input power to radiated power. Due to the antenna return loss, material loss, and coupling loss, the radiated power is always lower than the input power. Recommend> 40% (-4dB).

S11 or VSWR

S11 shows that the matching degree of the antenna’s 50 ohm impedance, to a certain extent, affects the

antenna efficiency. VSWR test methods can be used to measure this parameter. Recommend S11 <-10dB.

Polarization

Polarization is the rotation direction of the electric field in the maximum radiation direction of the antenna.

Description

Condition

Typ.

Power

（AT+CFUN=0）

GNSS fixing

70mA

GNSS tracking

70mA

Standby

34mA

TTFF

GNSS

Cold start<58s

58s

Warm start<70s

50s

Hot Start<8s

7.5s

Sensitivity

Acquisition

-144dbm

Tracking

-155dbm

CN0

GNSS Signal@-130dBm

38.5 dB-Hz

Positional accuracy

CEP

GNSS Signal@-130dBm

<3.5m

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It is recommended to use linear polarization.

Radiation pattern

Radiation pattern refers to the antenna’s electromagnetic field strength in the far field in all directions. Half-wave dipole antenna is the most suitable terminal antenna. For built-in antenna, PIFA antennas or IFA antennas are recommended: Antenna area: 6mm high*10mm wide*100mm long. Antenna radiation direction: Omni_directional(all direction).

Gain and directivity

Antenna directivity refers to the electromagnetic field strength of electromagnetic wave in all directions. Gain is a collection of antenna benefits and antenna directivity. Recommended antenna gain ≤2.5dBi.

Interference

In addition to the antenna performance, other interferences on the PCB also affect the performance of the module. In order to ensure the high performance of the module, interference must be controlled. Suggestions: For example, LCD, CPU, FPC cable, audio circuit, power supply should be away from the antenna as far as possible, and make the appropriate isolation and shielding, or filtering on the path.

Antenna index requirements

NL668-LA series module main antenna requirements

Frequency range

It must use the most suitable antenna to adapt to the relevant frequency band

Bandwidth (GSM/EDGE)

GSM850: 70 MHz GSM900: 80 MHz GSM1800(DCS): 170 MHz GSM1900(DCS): 140 MHz

Bandwidth (WCDMA)

WCDMA band 1 (2100): 250 MHz WCDMA band 2 (1900): 140 MHz WCDMA band 3 (1800):170 MHz WCDMA band 4 (2100): 440 MHz WCDMA band 5 (800): 70 MHz WCDMA band 8 (900): 80 MHz

Bandwidth (LTE)

LTE band 1(2100): 250 MHz LTE band 2(1900): 140 MHz LTE Band 3(1800): 170 MHz LTE Band 4(2100): 440 MHz LTE Band 5(850): 70 MHz

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NL668-LA series module main antenna requirements

LTE Band 7(2600): 190 MHz LTE Band 8(900): 80 MHz LTE Band 12(700): 50 MHz LTE Band 17(700): 50 MHz LTE Band 28(700):100 MHz LTE Band 66(2100):490 MHz LTE band 38(2600):50 MHz LTE band 40(2300):100 MHz

Impedance

50 ohm

Input power

> 33dBm (2 W) peak power GSM > 23dBm average power WCDMA & LTE &TD-SCDMA&CDMA&EVDO

Standing wave ratio recommended

≤ 2:1

Table 7- 6 Main Antenna Requirements

7.5.2

Antenna reference design

Antenna is a sensitive device, susceptible to the external environment. For example, the size of the module, the location of the antenna, the space it occupies, and the surrounding ground all may affect antenna performance. In addition, the RF cable connect with antenna, and the location of the fixed antenna also may affect its performance. NL668-LA series module’s three antenna all led by welding plate. recommended clients use the U.FL-R-SMT-1 antenna connector and corresponding match adapter cable. Figure 7-1 is reference design of main antenna and diversity antenna.

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Figure 7- 1 Main and diversity Antenna Reference Circuit

Figure 7-2 is reference design of GNSS antenna.

Figure 7- 2 GNSS Antenna Reference Circuit

Note：

⚫

All matches must be placed close to antenna to make sure the characteristic impedance of transmission cable is 50 ohms.

⚫

Since the antenna loss should be less than 0.3dB, keep PCB cable as short as possible.

⚫

Keep the PCB LAYOUT straight, and reduce holes on the route to another layer; also avoid right-angle and acute-angle wiring.

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⚫

PCB cable should have a good reference ground to avoid other signal cable near the antenna.

⚫

Recommend a complete ground level, and use this complete ground level as a reference ground.

⚫

Ground around antenna must be keep connect with main ground.

⚫

For more design information please refer to《FIBOCOM RF Antenna Application Design Instruction》

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8 Reliability

8.1

Limiting voltage range

The limiting voltage range is maximum voltage range that power supply and digital or analog input/output interfaces can withstand.

8.1.1

Absolute voltage range

The absolute voltage range of NL668-LA series module is shown as table 8-1.

Parameter

description

Min

Typ

Max

Unit

VBAT

Power supply

-0.3

3.8

4.7 V

GPIO

Digital IO supply voltage

-0.3

1.8

2.0 V

Table 8- 1 Absolute Voltage Range

8.1.2

Operating voltage range

：

logic low level；V

：

logic high level

；

Parameter VL V

Unit Min

Max

Min

Max

Digital input

-0.3

0.6

1.2

2.0 V

Digital output

- 0.45

1.35

- V

Parameter

I/O

Min

Typ

Max

Unit

VBAT

3.3

3.8

4.3 V

USIM_VDD

1.7/2.75

1.8/2.85

1.9/2.95

Table 8- 2 Operating Voltage Range

8.2

Environment temperature range

The recommended operating temperature range of NL668-LA series module.is -30℃~+75℃. When module operating at limited temperature range, some RF indexes may exceed standard, so module

application terminal should consider temperature control measurement. The module application terminal is recommended storage in certain temperature conditions. Modules out of the temperature range may not operate or may be damaged.

Temperature

Min

Typ

Max

Unit

Operating temperature

-30

℃

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Temperature

Min

Typ

Max

Unit

Limited operating temperature

-40 85

℃

Storage temperature

-40 90

℃

Table 8- 3 Environment Temperature Range

8.3

Environmental reliability requirements

Test items

Test conditions

Low temperature storage test

Temperature -40℃±3℃, 24 hours in shutdown state

High temperature storage test

Temperature +85℃±3℃, 24 hours in shutdown state

Temperature shock test

In shutdown state, 0.5 hour at -40℃ and +85℃ environment respectively, the temperature conversion time <3min, for 24 cycles

High temperature and humidity test

Temperature +85℃±3℃, humidity 90 ~ 95% RH, 24 hours in shutdown state

Low temperature operating test

Temperature -30℃±3℃, 24 hours in operating state

High temperature operating test

Temperature +75℃±3℃, 24 hours in operating state

Vibration test

Conduct vibration test according to the requirements shown in the table below:

Frequency

Random vibration ASD (Acceleration Spectral Density)

5~20Hz

0.96m2/s

20~500Hz

0.96m2/s3(20Hz), other -3dB/octave

Connector life test

30 times of insertion/removal for RF antenna interface cable

Table 8- 4 Environmental Reliability Requirements

8.4

ESD characteristics

NL668-LA series module design has considered ESD issue and provided ESD protect measurements, but take ESD issue taken by module carrier and secondary development into consideration, developers should care ESD protection of module application terminal. In addition to considering anti-static treatment of packaging, please refer to recommended circuit of interface design in the document. ESD allowable discharge range of NL668-LA series module show as table 7-5

Interface

Air discharge

Contact discharge

VBAT, GND

±10KV

±5KV

Antenna port

±8KV

±4KV

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Interface

Air discharge

Contact discharge

Other port

±1KV

±0.5KV

Table 8- 5 ESD Allowable Discharge Range

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9 Structure specification

9.1

Product appearance

The product appearance of NL668-LA series module is shown in Figure 9-1:

Figure 9- 1 Product Appearance

9.2

Structure dimension

The structure dimension of NL668-LA series module is shown as Figure 9-2:

Figure 9- 2 Structure Dimension (Unit: mm)

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9.3

PCB Soldering Pad and Stencil Design

PCB soldering pad and stencil design please refer to《FIBOCOM NL668 LCC SMT Design Description》.

9.4

SMT

SMT production process parameters and related requirements please refer to《FIBOCOM NL668 LCC SMT Design Description》.

9.5

Carrier and storage

Carrier and storage please refer to《FIBOCOM NL668 LCC SMT Design Description》.

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10 Approval

NL668-LA series module approval show as table 10-1:

Certification Scheme

NL668-LA

TBD

Table 10- 1 Approval

For more information please refer to Fibocom net.

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11 Appendix

11.1

GPRS and EGPRS Encoding Scheme

Encoding method

CS-1

CS-2

CS-3

CS-4

Rate

1/2

2/3

3/4 1

USF 3 3 3 3

Pre-coded USF

3 6 6 12

Radio Block excl.USF and BCS

181

268

312

428

BCS

Tail 4 4 4 -

Coded Bits

456

588

676

456

Punctured Bits

0 132

220 -

Data rate Kb/s

9.05

13.4

15.6

21.4

Table 11- 1 GPRS Encoding Scheme

In the GPRS standard, 29 types of GPRS multislot modes are defined for use by mobile stations. The multislot class defines the maximum rate of uplink and downlink. The expression is 3+1 or 2+2, the first number indicates the number of downlink timeslots, and the second number indicates the number of uplink timeslots. Active timeslots indicate the total number of timeslots that the GPRS device can use for both uplink and downlink communications.

Multislot Class

Downlink Slots

Uplink Slots

Active Slots

1 1

1 2

2 2

1 3 3 2

2 3 4 3

1 4 5 2

2 4

6 3

2 4

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Multislot Class

Downlink Slots

Uplink Slots

Active Slots

7 3

3 4

8 4

1 5

9 3

2 5

10 4

2 5 11 4

3 5

12 4

4 5

33 5

4 6

Table 11- 2 Multilevel Multislot Allocation

Coding Scheme

Modulation

Coding Family

1 Timeslot

2 Timeslot

4 Timeslot

CS-1

GMSK /

9.05kbps

18.1kbps

36.2kbps

CS-2

GMSK /

13.4kbps

26.8kbps

53.6kbps

CS-3

GMSK /

15.6kbps

31.2kbps

62.4kbps

CS-4

GMSK /

21.4kbps

42.8kbps

85.6kbps

MCS-1

GMSK C

8.80kbps

17.6kbps

35.2kbps

MCS-2

GMSK B

11.2kbps

22.4kbps

44.8kbps

MCS-3

GMSK A

14.8kbps

29.6kbps

59.2kbps

MCS-4

GMSK C

17.6kbps

35.2kbps

70.4kbps

MCS-5

8-PSK B

22.4kbps

44.8kbps

89.6kbps

MCS-6

8-PSK A

29.6kbps

59.2kbps

118.4kbps

MCS-7

8-PSK B

44.8kbps

89.6kbps

179.2kbps

MCS-8

8-PSK A

54.4kbps

108.8kbps

217.6kbps

MCS-9

8-PSK A

59.2kbps

118.4kbps

236.8kbps

Table 11- 3 EGPRS Modulation and Encoding Method

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11.2

Terms and acronyms

Term

Definition

AMR

Adaptive Multi-rate

bps Bits Per Second

CS Coding Scheme

DRX

Discontinuous Reception

EGSM

Extended GSM900 Band

FDD

Frequency Division Duplexing

GMSK

Gaussian Minimum Shift Keying

GSM

Global System for Mobile Communications

HSDPA

High Speed Down Link Packet Access

IMEI

International Mobile Equipment Identity

Imax

Maximum Load Current

LED

Light Emitting Diode

LSB

Least Significant Bit

LTE

Long Term Evolution

CA Carrier Aggregation

DLCA

Downlink Carrier Aggregation

SCell

Secondary Cell for CA

ME Mobile Equipment

MS Mobile Station

MT Mobile Terminated

PCB

Printed Circuit Board

PDU

Protocol Data Unit

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Term

Definition

PSK

Phase Shift Keying

QAM

Quadrature Amplitude Modulation

QPSK

Quadrature Phase Shift Keying

RF Radio Frequency

RHCP

Right Hand Circularly Polarized RMS

RMS

Root Mean Square

RTC

Real Time Clock

Rx Receive

SMS

Short Message Service

TDMA

Time Division Multiple Access

TE Terminal Equipment

TX Transmitting Direction

TDD

Time Division Duplexing

UART

Universal Asynchronous Receiver & Transmitter

UMTS

Universal Mobile Telecommunications System

URC

Unsolicited Result Code

(U)SIM

(Universal) Subscriber Identity Module

USSD

Unstructured Supplementary Service Data

Vmax

Maximum Voltage Value

Vnorm

Normal Voltage Value

Vmin

Minimum Voltage Value

VIHmax

Maximum Input High Level Voltage Value

VIHmin

Minimum Input High Level Voltage Value

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Term

Definition

VILmax

Maximum Input Low Level Voltage Value

VILmin

Minimum Input Low Level Voltage Value

VImax

Absolute Maximum Input Voltage Value

VImin

Absolute Minimum Input Voltage Value

VOHmax

Maximum Output High Level Voltage Value

VOHmin

Minimum Output High Level Voltage Value

VOLmax

Maximum Output Low Level Voltage Value

VOLmin

Minimum Output Low Level Voltage Value

VSWR

Voltage Standing Wave Ratio

WCDMA

Wideband Code Division Multiple Access

Table 11- 4 Terms and Acronyms

11.3

Fibocom Wireless NL668LA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual