Fibocom NL668-AM Series Instructions for use

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 1 of 62
FIBOCOM NL668-AM Hardware
User Manual
Version: V1.0.1
Date: 2018-11-13

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 2 of 62
Applicability type
No. Product model Description
1 NL668-AM-00 MCP is 4+2, and supports MAIN_ANT, DIV_ANT, GNSS_ANT
2 NL668-AM-01 Based on NL668-AM-00 delete Band 71

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 3 of 62
Copyright
Copyright ©2018 Fibocom Wireless Inc. All rights reserved.
Without the prior written permission of the copyright holder, any company or individual is prohibited to
excerpt, copy any part of or the entire document, or transmit the document in any form.
Attention
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
Version Author Assessor Approver Update
Date Description
V1.0.0 Gaoying Chenguojiang
Tumin 2018-10-26
Initial version
V1.0.1 Gaoying Chenguojiang
Tumin 2018-11-13
Add Band 17

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 4 of 62
Contents
1 Foreword ....................................................................................................................... 9
1.1 Introduction ................................................................................................................... 9
1.2 Safety Instruction .......................................................................................................... 9
1.3 Reference Standards .................................................................................................. 10
1.4 Related Document ...................................................................................................... 11
1.5 Federal Communication Commission Interference Statement..................................... 11
2 Product Overview ....................................................................................................... 13
2.1 Product Introduction ................................................................................................... 13
2.2 Product Specifications ................................................................................................ 13
2.3 Hardware Diagram ..................................................................................................... 14
3 Application Interface .................................................................................................. 16
3.1 LCC Interface ............................................................................................................. 16
3.1.1 Pin distribution ............................................................................................................... 16
3.1.2 Pin definition .................................................................................................................. 17
3.2 Power Supply ............................................................................................................. 22
3.2.1 Power supply ................................................................................................................. 23
3.2.2 1.8V Output ................................................................................................................... 24
3.2.3 Power consumption....................................................................................................... 24
3.3 Control Signal ............................................................................................................. 25
3.3.1 Module power on ........................................................................................................... 26
3.3.2 Module power off ........................................................................................................... 27
3.3.3 Module reset ................................................................................................................. 28
3.4 USB Interface ............................................................................................................. 30
3.4.1 USB interface definition ................................................................................................ 30
3.5 USIM Interface ........................................................................................................... 31
3.5.1 USIM pin ........................................................................................................................ 31
3.5.2 USIM interface circuit .................................................................................................... 31
3.5.3 USIM hot plug ............................................................................................................... 33
3.5.4 USIM design requirements ........................................................................................... 34
3.6 UART Interface ........................................................................................................... 34
3.6.1 UART interface definition .............................................................................................. 34
3.6.2 UART port application ................................................................................................... 35
3.7 Status Indicator ........................................................................................................... 36

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 5 of 62
3.7.1 NET_MODE Signal ....................................................................................................... 36
3.8 Low Power Mode ........................................................................................................ 37
3.8.1 Flight mode.................................................................................................................... 37
3.8.2 Sleep Mode ................................................................................................................... 38
3.9 Digital audio interface PCM ........................................................................................ 40
3.9.1 Support model ............................................................................................................... 40
3.9.2 PCM interface definition ................................................................................................ 40
3.9.3 PCM interface description ............................................................................................. 40
3.9.4 PCM signal description ................................................................................................. 41
3.10 ADC function .............................................................................................................. 42
4 RF Interface................................................................................................................. 43
4.1 NL668-AM Operating Frequency ................................................................................ 43
4.2 RF Output Power of NL668-AM .................................................................................. 43
4.3 RF Receiving Sensitivity of NL668-AM ....................................................................... 44
4.4 GNSS Receiver .......................................................................................................... 44
4.4.1 Basic description ........................................................................................................... 44
4.5 RF PCB Design .......................................................................................................... 45
4.5.1 Antenna RF connector .................................................................................................. 45
4.6 Antenna Design .......................................................................................................... 46
5 Electrical Characteristics .......................................................................................... 49
5.1 Limiting voltage range................................................................................................. 49
5.2 Environment temperature range ................................................................................. 49
5.3 Electrical characteristics of the interface in operating status ....................................... 49
5.4 Environmental reliability requirements ........................................................................ 50
5.5 ESD characteristics .................................................................................................... 51
6 Structure Specification .............................................................................................. 52
6.1 Product Appearance ................................................................................................... 52
6.2 Dimension of Structure ............................................................................................... 53
6.3 SMT Patch .................................................................................................................. 53
Appendix A Terms and Acronyms ................................................................................... 54
Appendix B ADP & MiniPCIe RF ports trace………………………………………………... 57

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 6 of 62
Figure
Figure 2-1 Hardware Diagram ............................................................................................................ 15
Figure 3-1 Pin Distribution Diagram(TOP plan perspective diagram) ................................................ 16
Figure 3-2 Power Design .................................................................................................................... 23
Figure 3-3 Power Limit ........................................................................................................................ 24
Figure 3-4 OC/OD Drive Power on Reference Circuit ........................................................................ 26
Figure 3-5 Button Power on Reference Circuit ................................................................................... 26
Figure 3-6 Power on Timing Control Diagram .................................................................................... 27
Figure 3-7 Power off Timing Control Diagram .................................................................................... 28
Figure 3-8 RESET_N OC/OD Drive Reference Circuit ...................................................................... 29
Figure 3-9 RESET_N Button Reference Circuit ................................................................................. 29
Figure 3-10 Reset Control Timing ....................................................................................................... 29
Figure 3-11 SIM Card Slot Diagram SIM016-8P-220P ....................................................................... 32
Figure 3-12 USIM/SIM Interface with Detection Signal Reference Design ........................................ 32
Figure 3-13 USIM/SIM Interface without Detection Signal Reference Design Diagram .................... 33
Figure 3-14 UART Level Translate Reference Circuit 1 ..................................................................... 35
Figure 3-15 UART Level Translate Reference Circuit 2 ..................................................................... 36
Figure 3-16 NET_MODE Reference Design Diagram........................................................................ 37
Figure 3-17 PCM_SYNC Timing ......................................................................................................... 41
Figure 3-18 PCM_CODEC to NL668-AM Timing ............................................................................... 41
Figure 3-19 NL668-AM to PCM_CODEC Timing ............................................................................... 41
Figure 3-20 CODEC Timing Parameters ............................................................................................ 42
Figure 4-1RF Reference Circuit Design ............................................................................................. 45
Figure 4-2 GNSS RF Reference Circuit ............................................................................................. 46
Figure 6-1Module Product Appearance (Top) .................................................................................... 52
Figure 6-2 Module Product Appearance (Bottom) .............................................................................. 52
Figure 6-3 Dimension of Structure (Unit: mm) .................................................................................... 53

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 7 of 62
Table
Table 2-1 Product Specifications......................................................................................................... 14
Table 3-1 Pin Definitions ..................................................................................................................... 22
Table 3-2 Power Interfaces ................................................................................................................. 22
Table 3-3 Power Filter Capacitor Design ............................................................................................ 23
Table 3-4 VDD_EXT Logic Level ........................................................................................................ 24
Table 3-5 Power Consumption ............................................................................................................ 25
Table 3-6 Control Signal...................................................................................................................... 26
Table 3-7 Power Off Modes ................................................................................................................ 27
Table 3-8 Module Reset ...................................................................................................................... 28
Table 3-9 USB Interface Definition ..................................................................................................... 30
Table 3-10 SIM Card Pin ..................................................................................................................... 31
Table 3-11SIM Card Hot Plug Function Configured AT Commands ................................................... 33
Table 3-12 USIM_PRESENCE Effective Level Switched AT command ............................................. 34
Table 3-13 Main Serial Port Pin .......................................................................................................... 35
Table 3-14 Debug Serial Port Pin ....................................................................................................... 35
Table 3-15 Network Indication pins ..................................................................................................... 36
Table 3-16 Network Indicator Status Description ................................................................................ 37
Table 3-17 W_DISABLE# Pin Description .......................................................................................... 37
Table 3-18 Module enter Fly Mode ..................................................................................................... 37
Table 3-19 Support model ................................................................................................................... 40
Table 3-20 PCM Interface Definition ................................................................................................... 40
Table 3-21 PCM Interface Description ................................................................................................ 40
Table 3-22 ADC Interface .................................................................................................................... 42
Table 4-1Operating Frequency ........................................................................................................... 43
Table 4-2 RF Output Power ................................................................................................................ 43
Table 4-3 RF Receiving Sensitivity ..................................................................................................... 44
Table 4-4 GNSS Receiver ................................................................................................................... 45
Table 4-5 Main Antenna Requirement ................................................................................................ 48
Table 5-1 Voltage Range ..................................................................................................................... 49
Table 5-2Environment Temperature Range ........................................................................................ 49
Table 5-3 Electrical Characteristics of the Interface in Operating Status ........................................... 50
Table 5-4 Environmental Reliability Requirements ............................................................................. 50
Table 5-5 ESD Allowable Discharge Range ....................................................................................... 51

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 8 of 62
Table A-0-1 Terms and Acronyms ....................................................................................................... 56

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 9 of 62
1 Foreword
1.1 Introduction
This document describes the electrical characteristics, RF performance, structure size, application
environment, etc. of NL668-AM module. With the assistance of the document and other instructions, the
developers can quickly understand the hardware functions of the NL668-AM module and develop
products.
1.2 Safety Instruction
By following the safety guidelines below, you can ensure your 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 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
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.

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 10 of 62
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.
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.
1.3 Reference Standards
This design of the product complies with the following standards:
 3GPP TS 51.010-1 V10.5.0: Mobile Station (MS) conformance specification; Part 1:
Conformance specification
 3GPP TS 34.121-1 V10.8.0: User Equipment (UE) conformance specification; Radio
transmission and reception (FDD); Part 1: Conformance specification
 3GPP TS 34.122 V10.1.0: Technical Specification Group Radio Access Network; Radio
transmission and reception (TDD)
 3GPP TS 36.521-1 V10.6.0: User Equipment (UE) conformance specification; Radio
transmission and reception; Part 1: Conformance testing
 3GPP TS 21.111 V10.0.0: USIM and IC card requirements
 3GPP TS 51.011 V4.15.0: Specification of the Subscriber Identity Module -Mobile Equipment
(SIM-ME) interface
 3GPP TS 31.102 V10.11.0: Characteristics of the Universal Subscriber Identity Module (USIM)
application
 3GPP TS 31.11 V10.16.0: Universal Subscriber Identity Module (USIM) Application
Toolkit(USAT)
 3GPP TS 36.124 V10.3.0: Electro Magnetic Compatibility (EMC) requirements for mobile
terminals and ancillary equipment
 3GPP TS 27.007 V10.0.8: AT command set for User Equipment (UE)
 3GPP TS 27.005 V10.0.1: Use of Data Terminal Equipment - Data Circuit terminating Equipment
(DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 11 of 62
1.4 Related Document
 FIBOCOM_RF Antenna Application Design Instruction
 FIBOCOM_ADP-NL668 Evaluation board instruction
 FIBOCOM_NL668 AT Command Manual
 FIBOCOM_EVK-GT8230-NL User Manual
 FIBOCOM_ NL668 LCC SMT Application Design Instruction
1.5 Federal Communication Commission Interference
Statement
FCC Regulations:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept any interference
received, including interference that may cause undesired operation.
This device has been tested and found to comply with the limits for a Class B digital device , pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiated radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help.
Caution: Changes or modifications not expressly approved by the party responsible for compliance could
void the user‘s authority to operate the equipment.
RF Exposure Information:
This device complies with FCC radiation exposure limits set forth for an uncontrolled environment. In
order to avoid the possibility of exceeding the FCC radio frequency exposure limits, human proximity to
the antenna shall not be less than 20cm (8 inches) during normal operation.

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 12 of 62
IMPORTANT NOTE :
This module is intended for OEM integrator. The OEM integrator is still responsible for the FCC
compliance requirement of the end product, which integrates this module. 20cm minimum distance has to
be able to be maintained between the antenna and the users for the host this module is integrated into.
Under such configuration, the FCC radiation exposure limits set forth for an population/uncontrolled
environment can be satisfied.
Any changes or modifications not expressly approved by the manufacturer could void the user's authority
to operate this equipment.
USERS MANUAL OF THE END PRODUCT :
In the user manual of the end product, the end user has to be informed to keep at least 20cm separation
with the antenna while this end product is installed and operated. The end user has to be informed that
the FCC radio-frequency exposure guidelines for an uncontrolled environment can be satisfied. The end
user has to also be informed that any changes or modifications not expressly approved by the
manufacturer could void the user's authority to operate this equipment. If the size of the end product is
smaller than 8x10cm, then additional FCC part 15.19 statement is required to be available in the users
manual: This device complies with Part 15 of FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference and (2) this device must accept any
interference received, including interference that may cause undesired operation.
LABEL OF THE END PRODUCT :
The final end product must be labeled in a visible area with the following " Contains Transmitter Module
FCC ID: ZMONL668AM01". If the size of the end product is larger than 8x10cm, then the following FCC
part 15.19 statement has to also be available on the label: This device complies with Part 15 of FCC rules.
Operation is subject to the following two conditions: (1) this device may not cause harmful interference
and (2) this device must accept any interference received, including interference that may cause
undesired operation.

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 13 of 62
2 Product Overview
2.1 Product Introduction
The NL668-AM wireless module is a wideband wireless terminal product applicable to various network
formats and multi-bands including FDD-LTE/UMTS.
2.2 Product Specifications
Specification
Operating
frequency
NL668-AM-00
LTE FDD: Band 2,4,5,12,13,17,66,71
WCDMA: Band 2,4,5
NL668-AM-01
LTE FDD: Band 2,4,5,12,13,17,66
WCDMA: Band 2,4,5
Data
transmission
LTE FDD Rel.9
150Mbps DL/50Mbps UL(Cat 4); LTE Downlink MIMO 2x2,
4x2
WCDMA Rel.8
WCDMA:384 kbps DL/384 kbps UL
DC-HSDPA+:42Mbps (Cat 24)/HSUPA:5.76Mbps (Cat 6)
Power 3.3V～4.3V (3.8V recommended)
Temperature
Normal: -30°C～+75°C
Extended: -40°C～+85°C
Storage: -40°C～+85°C
Power
consumption
Base current: <1.5mA
Sleep mode: ≤3mA
Idle mode: <20mA
Physical
characteristics
Package: LCC 144PIN
Size: 32.0×29.0×2.4 mm
Weight: About 5.5g
Interface
Antenna Antenna: Main x 1, GNSS x 1, DIV x 1
Functional USIM 3.0V/1.8V

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 14 of 62
Interface USB 2.0 x 1
UART, PCM, I2C, SGMII, SDIO, GPIO, SPI
System Indicator
ADC
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
MMS service Need AP to realize MMS protocol
Table 2-1 Product Specifications
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 specifications.
2.3 Hardware Diagram
Figure 2-2 hardware diagram shows the main hardware features of the NL668-AM module, including
baseband and RF features.
Baseband includes:
 UMTS/ LTE FDD controller
 PMIC
 MCP
 UART、USB、SIM、PCM、I2C、SPI、SGMII、SDIO、ADC
RF includes:
 RF Transceiver
 RF PA
 RF filter
 Antenna

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 15 of 62
Figure 2-1 Hardware Diagram

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 16 of 62
3 Application Interface
3.1 LCC Interface
NL668-AM module adopts LCC packaging, with a total of 144 pins.
3.1.1 Pin distribution
Figure 3-1 Pin Distribution Diagram(TOP plan perspective diagram)
Note:
“73 ~ 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.

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 17 of 62
3.1.2 Pin definition
The pin definitions are shown in the following table:
Pin Pin Name I/O Level Description
1 WAKEUP_IN I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
External device wake-up module
2 AP_READY I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
Reserved
3 RESERVED - Reserved
4 W_DISABLE# I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
Module flight mode control
5 NET_MODE O VOHmin=1.35V
VOLmax=0.45V Module state indicate
6 NET_STATUS O VOHmin=1.35V
VOLmax=0.45V Reserved
7 VDD_EXT PO 1.8V Module digital level, 1.8V output, 80mA
8 GND G - Ground
9 GND G - Ground
10 GND G - Ground
11 DBG_RXD I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
DEBUG serial port Receive data
12 DBG_TXD O VOLmax=0.45V
VOHmin=1.35V DEBUG serial port Transmit data
13 USIM_PRESENCE I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
USIM card hot plug detection
14 USIM _VDD O
For 1.8V USIM:
Vmax=1.9V
Vmin=1.7V
USIM power

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 18 of 62
Pin Pin Name I/O Level Description
For 3.0V USIM:
Vmax=3.05V
Vmin=2.7V
IOmax=150mA
15 USIM _DATA O
For 1.8V USIM:
VILmax=0.6V
VIHmin=1.2V
VOLmax=0.45V
VOHmin=1.35V
For 3.0V USIM:
VILmax=1.0V
VIHmin=1.95V
VOLmax=0.45V
VOHmin=2.55V
USIM data signal cable
16 USIM _CLK O
For 1.8V USIM:
VOLmax=0.45V
VOHmin=1.35V
For3.0V USIM:
VOLmax=0.45V
VOHmin=2.55V
USIM clock signal cable
17 USIM _RST O
For 1.8V USIM:
VOLmax=0.45V
VOHmin=1.35V
For 3.0V USIM:
VOLmax=0.45V
VOHmin=2.55V
USIM reset signal cable
18 NC - - NC
19 GND G - Ground
20 RESET_N I
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
Module reset signal, active low, no
need pull up externally
21 PWRKEY I
VIHmax=2.1V
VIHmin=1.3V
VILmax=0.5V
Turn on/off the module, active low, no
need pull up externally
22 GND G - Ground
23 SD_INS_DET I - Reserved
24 PCM_IN I VILmin=-0.3V PCM input signal

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 19 of 62
Pin Pin Name I/O Level Description
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
25 PCM_OUT O VOLmax=0.45V
VOHmin=1.35V PCM output signal
26 PCM_SYNC I/O
VOLmax=0.45V
VOHmin=1.35V
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
PCM synchronization signal
27 PCM_CLK I/O
VOLmax=0.45V
VOHmin=1.35V
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
PCM clock signal
28 SDC2_DATA3 I/O - Reserved
29 SDC2_DATA2 I/O - Reserved
30 SDC2_DATA1 I/O - Reserved
31 SDC2_DATA0 I/O - Reserved
32 SDC2_CLK O - Reserved
33 SDC2_CMD I/O - Reserved
34 VDD_SDIO PO - Reserved
35 ANT_DIV I - Diversity antenna
36 GND G - Ground
37 SPI_CS_N I - Reserved
38 SPI_MOSI I - Reserved
39 SPI_MISO O - Reserved
40 SPI_CLK O - Reserved
41 I2C_SCL OD - I2C interface clock signal
42 I2C_SDA OD - I2C interface data signal
43 NC - - NC
44 ADC1 I - Analog to digital converter interface
45 ADC0 I - Analog to digital converter interface 0
46 GND G - Ground

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FIBOCOM NL668-AM Hardware User Manual Page 20 of 62
Pin Pin Name I/O Level Description
47 ANT_GNSS I - GNSS antenna
48 GND G - Ground
49 ANT_MAIN I/O - Main antenna
50 GND G - Ground
51 GND G - Ground
52 GND G - Ground
53 GND G - Ground
54 GND G - Ground
55 NC - - NC
56 GND G - Ground
57 VBAT_RF I
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
RF power input (3.3V~4.3V)
58 VBAT_RF I
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
RF power input (3.3V~4.3V)
59 VBAT_BB I
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
Baseband power input（3.3V~4.3V）
60 VBAT_BB I
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
Baseband Power Input (3.3V~4.3V)
61 STATUS O VOHmin=1.35V
VOLmax=0.45V Reserved
62 RI O VOLmax=0.45V
VOHmin=1.35V Module output ring indicator
63 DCD O VOLmax=0.45V
VOHmin=1.35V Module output data carrier detection
64 CTS I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
Clear to send
65 RTS O VOLmax=0.45V
VOHmin=1.35V Request to send
66 DTR I
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
Data ready