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HF-LPT120A
User Manual
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Shanghai High-Flying Electronics Technology Co. HF-LPT120, HF-LPT120A User Manual

High-Flying
HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
HF-LPT120&HF-LPT120A
Low Power WiFi Module User Manual
V 1.6
Support IEEE802.11b/g/n Wireless Standards
Based on Self-developed High Cost Effective SOC
Support UART/GPIO Data Communication Interface
Support Work As STA/AP Mode
Support Smart Link Function (APP program provide)
Support Wireless and Remote Firmware Upgrade Function
Support External I-PEX or Internal PCB Antenna Option(HF-LPT120)
Support Copper Line Antenna(HF-LPT120A)
Single +3.3V Power Supply
Smallest Size: 22mm x 13.5mm x 6mm, 1x10 2mm Connector(HF-LPT120)
Smallest Size: 22mm x 14.3mm x 6mm, 1x10 2mm Connector(HF-LPT120A)
FCC/CE/SRRC Certificated
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
TABLE OF CONTENTS
LIST OF FIGURES ................................................................................................................................... 5
LIST OF TABLES .................................................................................................................................... 6
HISTORY .................................................................................................................................................. 7
1. PRODUCT OVERVIEW ................................................................................................................ 8
1.1. General Description ................................................................................................................. 8
1.1.1 Device Features .................................................................................................................. 8
1.1.2 Device Paremeters ............................................................................................................. 9
1.1.3 Key Application ................................................................................................................... 9
1.2. Hardware Introduction ...........................................................................................................10
1.2.1. Pins Definition ...................................................................................................................10
1.2.2. Electrical Characteristics ..................................................................................................11
1.2.3. Mechanical Size ................................................................................................................12
1.2.4. On-board PCB Antenna ....................................................................................................13
1.2.5. External Antenna ..............................................................................................................13
1.2.6. Evaluation Kit ....................................................................................................................14
1.2.7. Order Information ..............................................................................................................15
1.3. Typical Application ................................................................................................................16
1.3.1. Hardware Typical Application ...........................................................................................16
1.4. Internal PCB Antenna ............................................................................................................17
2. FUNCTIONAL DESCRIPTION ..................................................................................................19
2.1. Wireless Networking ..............................................................................................................19
2.1.1. Basic Wireless Network Based On AP (Infrastructure) ....................................................19
2.1.2. Wireless Network Based On STA .....................................................................................19
2.2. Work Mode : Transparent Transmission Mode ...................................................................20
2.3. Encryption ..............................................................................................................................20
2.4. Parameters Configuration .....................................................................................................20
2.5. Firmware Update ....................................................................................................................21
2.6. SOCKET B Function ..............................................................................................................21
2.7. Multi-TCP Link Connection (Reserved) ...............................................................................21
3. OPERATION GUIDELINE ..........................................................................................................23
3.1. Configuration ..........................................................................................................................23
3.1.1. Open Web Management Interface ...................................................................................23
3.1.2. System Page.....................................................................................................................24
3.1.3. Work Mode Page ..............................................................................................................24
3.1.4. STA Setting Page .............................................................................................................25
3.1.5. AP Setting Page ...............................................................................................................26
3.1.6. Other Setting Page ...........................................................................................................26
3.1.7. Account Management Page .............................................................................................27
3.1.8. Upgrade Software Page ...................................................................................................27
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
3.1.9. Restart Page .....................................................................................................................27
3.1.10. Restore Page ................................................................................................................28
3.1.11. Internal Webpage ..........................................................................................................28
3.2. Usage Introduction ................................................................................................................29
3.2.1. Software Debug Tools ......................................................................................................29
3.2.2. Network Connection .........................................................................................................29
3.2.3. Default Parameter Setting ................................................................................................29
3.2.4. Module Debug...................................................................................................................30
3.3. Typical Application Examples ..............................................................................................31
3.3.1. Wireless Control Application .............................................................................................31
3.3.2. Remote Management Application.....................................................................................31
3.3.3. Transparent Serial Port Application ..................................................................................32
4. AT+INSTRUCTION INTRODUCTION ......................................................................................33
4.1. Configuration Mode ...............................................................................................................33
4.1.1. Switch to Configuration Mode ...........................................................................................33
4.2. AT+Instruction Set Overview ................................................................................................34
4.2.1. Instruction Syntax Format .................................................................................................34
4.2.2. AT+Instruction Set ............................................................................................................35
4.2.2.1. AT+E .............................................................................................................................37
4.2.2.2. AT+WMODE .................................................................................................................37
4.2.2.3. AT+ENTM .....................................................................................................................37
4.2.2.4. AT+MID .........................................................................................................................37
4.2.2.5. AT+VER ........................................................................................................................38
4.2.2.6. AT+BVER ......................................................................................................................38
4.2.2.7. AT+RELD ......................................................................................................................38
4.2.2.8. AT+FCLR ......................................................................................................................38
4.2.2.9. AT+Z..............................................................................................................................38
4.2.2.10. AT+H .........................................................................................................................38
4.2.2.11. AT+CFGTF ................................................................................................................39
4.2.2.12. AT+UART ..................................................................................................................39
4.2.2.13. AT+NETP ..................................................................................................................40
4.2.2.14. AT+MAXSK ...............................................................................................................40
4.2.2.15. AT+TCPLK ................................................................................................................40
4.2.2.16. AT+TCPTO ................................................................................................................41
4.2.2.17. AT+TCPDIS ...............................................................................................................41
4.2.2.18. AT+SOCKB ...............................................................................................................41
4.2.2.19. AT+TCPDISB ............................................................................................................42
4.2.2.20. AT+TCPTOB .............................................................................................................42
4.2.2.21. AT+TCPLKB ..............................................................................................................43
4.2.2.22. AT+WSSSID ..............................................................................................................43
4.2.2.23. AT+WSKEY ...............................................................................................................43
4.2.2.24. AT+WANN .................................................................................................................44
4.2.2.25. AT+WSMAC ..............................................................................................................44
4.2.2.26. AT+WSLK ..................................................................................................................45
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
4.2.2.27. AT+WSLQ .................................................................................................................45
4.2.2.28. AT+WSCAN ...............................................................................................................45
4.2.2.29. AT+LANN ..................................................................................................................45
4.2.2.30. AT+WAP ....................................................................................................................46
4.2.2.31. AT+WAKEY ...............................................................................................................46
4.2.2.32. AT+WADHCP ............................................................................................................46
4.2.2.33. AT+WALK ..................................................................................................................47
4.2.2.34. AT+WALKIND ............................................................................................................47
4.2.2.35. AT+WAPMXSTA .......................................................................................................47
4.2.2.36. AT+OTA .....................................................................................................................48
4.2.2.37. AT+UPURL ................................................................................................................48
4.2.2.38. AT+DISPS .................................................................................................................48
4.2.2.39. AT+PLANG ................................................................................................................49
4.2.2.40. AT+WEBU .................................................................................................................49
4.2.2.41. AT+WRMID ...............................................................................................................49
4.2.2.42. AT+ASWD .................................................................................................................49
4.2.2.43. AT+SMTLK ................................................................................................................50
4.2.2.44. AT+SMEM .................................................................................................................50
4.2.2.45. AT+NDBGL ................................................................................................................50
5. PACKAGE INFORMATION ........................................................................................................52
5.1. Recommended Reflow Profile ..............................................................................................52
5.2. Device Handling Instruction (Module IC SMT Preparation) ...............................................52
5.3. Shipping Information .............................................................................................................53
APPENDIX A: HW REFERENCE DESIGN ......................................................................................54
APPENDIX B: HTTP PROTOCOL TRANSFER ..............................................................................55
B.1. Sending HTTP Raw Data in Throughput Mode ......................................................................55
APPENDIX C:REFERENCES ............................................................................................................56
C.1．High-Flying Mass Production Tool ........................................................................................56
C.2．SmartLink APP V7 Config Tool ..............................................................................................56
C.3．EVK Quick Start Guide ...........................................................................................................56
C.4．Module Upgrade ......................................................................................................................56
C.5．Other Tools ..............................................................................................................................56
APPENDIX D: CONTACT INFORMATION ......................................................................................57
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual

LIST OF FIGURES

Figure 1. HF-LPT120 Pins Map ...........................................................................................................10
Figure 2. HF-LPT120 Mechanical Dimension......................................................................................12
Figure 3. HF-LPT120A Mechanical Dimension ...................................................................................13
Figure 4. Suggested Module Placement Region .................................................................................13
Figure 5. HF-LPT120 External Antenna picture ..................................................................................13
Figure 6. LPT120/LPT220 EVK ...........................................................................................................14
Figure 7. HF-LPT120 Order Information ..............................................................................................15
Figure 8. HF-LPT120A Order Information ...........................................................................................15
Figure 9. HF-LPT120 Hardware Typical Application ...........................................................................16
Figure 10. HF-LPT120 Antenna .........................................................................................................17
Figure 11. HF-LPT120 Antenna radiation pattern ..............................................................................17
Figure 12. HF-LPT120 XY plane radiation pattern ............................................................................18
Figure 13. HF-LPT120XZ plane radiation pattern ..............................................................................18
Figure 14. HF-LPT120YZ plane radiation pattern ..............................................................................18
Figure 15. HF-LPT120 Basic Wireless Network Structure .................................................................19
Figure 16. HF-LPT120 STA Network Structure .................................................................................19
Figure 17. Socket B function demo ....................................................................................................21
Figure 18. Multi-TCP Link Data Transmition Structure ......................................................................22
Figure 19. Open Web Management page ..........................................................................................23
Figure 20. System Web Page ............................................................................................................24
Figure 21. Work Mode Page ..............................................................................................................24
Figure 22. STA Setting Page .............................................................................................................25
Figure 23. STA Scan Page ................................................................................................................25
Figure 24. AP Setting Page ...............................................................................................................26
Figure 25. Other Setting Page ...........................................................................................................26
Figure 26. Account Page....................................................................................................................27
Figure 27. Upgrade SW page ............................................................................................................27
Figure 28. Restart Page .....................................................................................................................28
Figure 29. Restore Page ....................................................................................................................28
Figure 30. Internal Webpage .............................................................................................................29
Figure 31. STA Interface Debug Connection .....................................................................................29
Figure 32. AP Interface Debug Connection .......................................................................................29
Figure 33. “CommTools” Serial Debug Tools ....................................................................................30
Figure 34. “TCPUDPDbg” Tools Create Connection .........................................................................30
Figure 35. “TCPUDPDbg” Tools Setting ............................................................................................31
Figure 36. “TCPUDPDbg” Tools Connection .....................................................................................31
Figure 37. Wireless Control Application .............................................................................................31
Figure 38. Remote Management Application.....................................................................................32
Figure 39. Transparent Serial Port Application ..................................................................................32
Figure 40. HF-LPT120 Default UART Port Parameters .....................................................................33
Figure 41. Switch to Configuration Mode ...........................................................................................33
Figure 42. ”AT+H” Instruction for Help ...............................................................................................34
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Figure 43. Reflow Soldering Profile ...................................................................................................52
Figure 44. Shipping Information .........................................................................................................53

LIST OF TABLES

HF-LPT120 Module Technical Specifications ........................................................................ 9 Table1.
HF-LPT120 Pins Definition ...................................................................................................10 Table2.
Absolute Maximum Ratings: .................................................................................................11 Table3.
Power Supply & Power Consumption: .................................................................................12 Table4.
Table5.
HF-LPT120 External Antenna Parameters ..........................................................................13
HF-LPT120 Evaluation Kit Interface Description ..................................................................14 Table6.
HF-LPT120 Web Access Default Setting .............................................................................23 Table7.
Error Code Describtion .........................................................................................................35 Table8.
AT+Instruction Set List .........................................................................................................35 Table9.
Reflow Soldering Parameter ................................................................................................52 Table10.
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual

HISTORY

Ed. V1.02 11-03-2015 First Version. Ed. V1.03 11-11-2015 Modify IO PIN Description. Ed. V1.04 11-27-2015 Change Module PCB. Ed. V1.1 12-21-2015 Update AT command supported by 2.0.01 version firmware. Ed. V1.1.1 01-04-2016 Add HF-LPT100-A Type. Ed. V1.2 01-29-2016 Modify HF-LPT100-A to HF-LPT100A Type, Update AT command
supported by 2.0.03 version firmware. Add support for AT+E、AT+SOCKB、AT+TCPDISB、 AT+TCPTOB、AT+TCPLKB、AT+WALK、AT+WALKIND command. Correct the AT+NETP command description.
Ed. V1.3 03-14-2015 Update AT command supported by 2.0.04 version firmware. Add support for AT+MAXSK、AT+WAPMXSTA command. Update AT+NETP、AT+UART command. All
the reserved function is not supported yet. See appendix C to get new firmware.
Ed. V1.4 04-29-2016 Update AT command supported by 2.0.06 version firmware. Add
support for AT+UPURL. Modify AT+UART flow control, modify AT+DISPS function. Update the new EVK data. See appendix C for new firmware. See LPB120 manual for the module usage and AT command list.
Ed. V1.5 10-25-2016 Update boot GPIO requirement. Ed. V1.6 12-19-2016 Update 2.09-6 firmware webpage function, add the whole function into
this manual.
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual

1. PRODUCT OVERVIEW

1.1. General Description

The HF-LPT120 is a fully self-contained small form-factor, single stream, 802.11b/g/n Wi-Fi module, which provide a wireless interface to any equipment with a Serial/PWM interface for data transfer.HF­LPT120 integrate MAC, baseband processor, RF transceiver with power amplifier in hardware and all Wi-Fi protocol and configuration functionality and networking stack, in embedded firmware to make a fully self-contained 802.11b/g/n Wi-Fi solution for a variety of applications.
The HF-LPT120 employs the world's lowest power consumption embedded architecture. It has been optimized for all kinds of client applications in the home automation, smart grid, handheld device, personal medical application and industrial control that have lower data rates, and transmit or receive data on an infrequent basis.
The HF-LPT120 integrates all Wi-Fi functionality into a low-profile, 22mm x 13.5mm x 6mm module package that can be easily mounted on main PCB with application specific circuits. Also, module provides built-in antenna, external antenna option.
The HF-LPT120A module add shield and has passed FCC/CE/SRRC, the following description all use HF-LPT120 for the common function.

1.1.1 Device Features

Support IEEE802.11b/g/n Wireless Standards Based on Self-developed High Cost Effective SOC Support UART/GPIO Data Communication Interface Support Work As STA/AP Mode Support Smart Link Function (APP program provide) Support Wireless and Remote Firmware Upgrade Function Support External I-PEX or Internal PCB Antenna Option(HF-LPT120) Support Copper Line Antenna(HF-LPT120A) Single +3.3V Power Supply Smallest Size: 22mm x 13.5mm x 6mm, 1x10 2mm Connector(HF-LPT120) Smallest Size: 22mm x 14.3mm x 6mm, 1x10 2mm Connector(HF-LPT120A) FCC/CE/SRRC Certificated
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Class
Item
Parameters
Wireless Parameters
Certification
FCC/CE/SRRC/RoHS
Wireless standard
802.11 b/g/n
Frequency range
2.412GHz-2.484GHz
Transmit Power
802.11b: +16 +/-2dBm (@11Mbps)
802.11g: +14 +/-2dBm (@54Mbps)
802.11n: +13 +/-2dBm (@HT20, MCS7)
Receiver Sensitivity
802.11b: -87 dBm (@11Mbps ,CCK)
802.11g: -73 dBm (@54Mbps, OFDM)
802.11n: -71 dBm (@HT20, MCS7)
Antenna Option HF-LPT120
External:I-PEX Connector
Internal:PCB Printed Antenna
Antenna Option HF-LPT120A
Internal: Copper Line Antenna
Hardware Parameters
Data Interface UART
GPIO
Operating Voltage
2.95~3.6V
Operating Current
Peak (Continuous TX): 280mA Average(STA, Continuous TX): 100mA Average(STA, No TX data). 30mA Average(AP): 120mA
Operating Temp.
-20℃- 85℃
Storage Temp.
-40℃- 125℃
Dimensions and Size
22mm x 13.5mm x 6mm(HF-LPT120)
Dimensions and Size
22mm x 14.3mm x 6mm(HF-LPT120A)
External Interface
1x10, 2mm DIP
Software Parameters
Network Type
STA /AP
Security Mechanisms
WEP/WPA-PSK/WPA2-PSK
Encryption
WEP64/WEP128/TKIP/AES
Update Firmware
Local Wireless, Remote
Customization
Support customization and SDK
Network Protocol
IPv4, TCP/UDP/HTTP
User Configuration
AT+instruction set. Android/ iOS Smart Link APP tools

1.1.2 Device Paremeters

HF-LPT120 Module Technical Specifications Table1.

1.1.3 Key Application

Remote equipment monitoring Asset tracking and telemetry Security Industrial sensors and controls Home automation Medical devices
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Pin
Description
Net Name
Signal
Type
Comments
1
Ground
GND
Power
2
+3.3V Power
DVDD
Power
3.3V@300mA
3
Restore
Configuration
nReload
I/O,PU
nReload Function
GPIO_2, Leave it if not use
Detailed functions see <Notes>
4
Module Reset
EXT_RESETn
I,PU
“Low” effective hardware reset input.
Leave it if not use
5
UART0
UART0_RX
I
UART0 Communication Input
GPIO_19
6
UART0
UART0_TX
O,PU
UART0 Communication Output
GPIO_20
7
UART1_TXD
GPIO_5
I/O,PU
UART1 Debug Output
GPIO_5, Leave it if not use
Detailed functions see <Notes>
8
UART1_RXD
GPIO_6
I/O
UART1 Debug Input
GPIO_6, Leave it if not use
Detailed functions see <Notes>
9
GPIO_3
nReady
I/O
nReady Function
GPIO_3, Leave it if not use
Detailed functions see <Notes>
10
GPIO_15
nLink
I/O
nLink Function
GPIO_15, Leave it if not use
Detailed functions see <Notes>

1.2. Hardware Introduction

1.2.1. Pins Definition

Figure 1. HF-LPT120 Pins Map
HF-LPT120 Pins Definition Table2.
<Notes>
When bootup, module PIN6/PIN7 must be high， otherwise the module fail to work
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Parameter
Condition
Min.
Typ.
Max.
Unit
Storage temperature range
-40 125
°C
Maximum soldering temperature
IPC/JEDEC J-STD-020
260
°C
Supply voltage
0 3.6
V
Voltage on any I/O pin
0
3.6
V
ESD (Human Body Model HBM)
TAMB=25°C
2.5
KV
ESD (MM)
TAMB=25°C
0.25
KV
I—Input, O—Output,PU—Internal Pullup Resistor； I/O: Digital I/O；Power—Power
nReload Pin (Button) function：
1. When this pin is set to “low” during module boot up, the module will enter wireless firmware and config upgrade mode. This mode is used for customer manufacture. (See Appendix D to download software tools for customer batch configuration and upgrade firmware during mass production)
2. After module is powered up, short press this button ( “Low” < 2s ) and loose to make
the module go into “Smart Link “ config mode, waiting for APP to set password and
other information. (See Appendix D to download SmartLink APP)
3. After module is powered up, long press this button ( “Low” > 4s ) and loose to make the module recover to factory setting.
High-Flying strongly suggest customer fan out this pin to connector or button for “Manufacture” and “ Smart Link” application.
nReady Pin (LED) function(Low effective)：
1. OS initial finished indicator. Only after this pin output low, can the UART function be used.
nLink Pin (LED) function(Low effective)：
1. At wireless firmware and config upgrade mode , this LED used to indicate configure and upgrade status.
2. At “Smart Link “ config mode, this LED used to indicate APP to finish setting.
3. At normal mode, it’s Wi-Fi link status indicator
High-Flying strongly suggest customer fan out this pin to LED.
UART1 Debug ：
1. Enable UART1 log information output by AT+NDBGL=1,1 via UART0, UART1 baud rate is fixed at 115200.
2. After UART1 is enabled, it will output system run log information and it can direct process AT command(No need to enter command mode like UART0)

1.2.2. Electrical Characteristics

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Table3.
Absolute Maximum Ratings:
High-Flying
HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Parameter
Condition
Min.
Typ.
Max.
Unit
Operating Supply voltage
2.95
3.3
3.6
V
Supply current, peak
Continuous Tx
280 mA
Supply current,
STA No data transfer
30 mA
Supply current,
STA Continuous data transfer
100
mA
Supply current,
AP 120
mA
Table4.

1.2.3. Mechanical Size

HF-LPT120 modules physical size （Unit: mm） as follows:
Power Supply & Power Consumption:
Figure 2. HF-LPT120 Mechanical Dimension
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Item
Parameters
Frequency range
2.4~2.5GHz
Impedance
50 Ohm
VSWR
2 (Max)
Return Loss
-10dB (Max)
Connector Type
I-PEX or populate directly
Figure 3. HF-LPT120A Mechanical Dimension

1.2.4. On-board PCB Antenna

HF-LPT120 module support internal on-board PCB antenna option. When customer select internal antenna, you shall comply with following antenna design rules and module location suggestions:
For customer PCB, RED color region (8x10mm) can’t put componet or paste GND net; Antenna must away from metal or high components at least 10mm;
Antenna can’t be shielded by any metal enclosure;
Figure 4. Suggested Module Placement Region
High-Flying suggest HF-LPT120 module better locate in following region at customer board, which to reduce the effect to antenna and wireless signal, and better consult High-Flying technical people when you structure your module placement and PCB layout.

1.2.5. External Antenna

HF-LPT120 supports two way of external antenna as the following picture show, The I-PEX interface or the PAD interface(remove the I-PEX connector). The user may choose one of them. If user select external antenna, HF-LPT120 modules must be connected to the 2.4G antenna according to IEEE
802.11b/g/n standards. We can provide external antenna if needed. Contact with our salesman. The antenna parameters required as follows:
Figure 5. HF-LPT120 External Antenna picture
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HF-LPT120 External Antenna Parameters Table5.
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Function
Name
Description
External Interface
RS232
Main data/command RS-232 interface
USB
USB to UART interface
DC5V
DC jack for power in, 5V input.
LED
Power
Power LED
Ready
nReady LED
Link
nLink LED
Button nReload
Restore factory default configuration after push this pin more than 4s.
See 1.2.1

1.2.6. Evaluation Kit

High-Flying provides the evaluation kit to promote user to familiar the product and develop the detailed application. The evaluation kit shown as below, user can connect to HF-LPT120 module with the RS­232 UART, or Wireless interface to configure the parameters, manage the module or do the some functional tests. The EVK support .5V DC power supply.
Figure 6. LPT120/LPT220 EVK
Notes: User need download USB to UART port driver from High-Flying web or contact with technical support people for more detail. The external interface description for evaluation kit as follows:
HF-LPT120 Evaluation Kit Interface Description Table6.
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual

1.2.7. Order Information

Base on customer detailed requirement, HF-LPT120 series modules provide different variants and physical type for detailed application.
Figure 7. HF-LPT120 Order Information
Figure 8. HF-LPT120A Order Information
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual

1.3. Typical Application

1.3.1. Hardware Typical Application

Figure 9. HF-LPT120 Hardware Typical Application
Notes: nReset- Module hardware reset signal. Input. Logics “0” effective.
There is pull-up resister internal and no external pull-up required. When module power up or some issue happened, MCU need assert nRST signal “0” at least 10ms, then set” 1” to keep module fully reset.
nReload- Module restore to factory default configuration.Input. Logics “0” effective.
(This pin is recommend to connect to button, is used to enter wireless upgrade mode)
User can de-assert nReload signal “0” more than 4s through button or MCU pin, then release, module will restore to factory default configuration and re-start boot up process.. If nReload function not required, can leave this pin open.
UART0_TXD/RXD- UART port data transmit and receive signal.
nReady- Module boot up ready signal. Output. Logics “0” effective.
The module will output “0” after normal boot up. This signal used to judge if module finish boot up and
ready for application or working at normal mode. If nReady function not required, can leave this pin open.
nLink- Module WIFI connection status indication. Output.
(This pin is recommend to connect to LED, indicate status when the module in wireless upgrade mode)
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HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
When module connects to AP (AP associated), this pin will output “0”. This signal used to judge if module already at WiFi connection status. Thers is pull-up resister internal and no external pull-up required. If nLink function not required, can leave this pin open.

1.4. Internal PCB Antenna

Figure 10. HF-LPT120 Antenna
Antenna radiation efficiency 49.2%
Figure 11. HF-LPT120 Antenna radiation pattern
XY plane maximum gain:-1.21dB, minimum gain: -31.55dB
Shanghai High-Flying Electronics Technology Co., Ltd(www.hi-flying.com) - 17 -
High-Flying
HF-LPT120&HF-LPT120A Low Power WiFi Module User Manual
Figure 12. HF-LPT120 XY plane radiation pattern
XZ plane maximum gain:-0.99dB, minimum gain:-1.6dB
Figure 13. HF-LPT120XZ plane radiation pattern
YZ plane maximum gain:-0.99dB, minimum gain:-11.52dB
Figure 14. HF-LPT120YZ plane radiation pattern
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