Quectel_GNSS_Low_Power_Mode_Application_Note_V2.0(Quectel_GNSS_Low_Power_Mode_Application_Note

GNSS Low Power Mode Application Note GNSS Module Series Rev. GNSS_Low_Power_Mode_Application_Note_V2.0 Date: 2016-05-16 www.quectel.com

GNSS Module Series GNSS Low Power Mode Application Note Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters: Quectel Wireless Solutions Co., Ltd. Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233 Tel: +86 21 5108 6236 Email: info@quectel.com Or our local office. For more information, please visit: http://www.quectel.com/support/salesupport.aspx For technical support, or to report documentation errors, please visit: http://www.quectel.com/support/techsupport.aspx Or email to: Support@quectel.com GENERAL NOTES QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION. ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. COPYRIGHT THE INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF QUECTEL CO., LTD. TRANSMITTING, REPRODUCTION, DISSEMINATION AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THE CONTENT ARE FORBIDDEN WITHOUT PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL OR DESIGN. Copyright © Quectel Wireless Solutions Co., Ltd. 2016. All rights reserved. GNSS_Low_Power_Mode_Application_Note Confidential / Released 1 / 12 Quectel Confidential

GNSS Module Series GNSS Low Power Mode Application Note About the Document History Revision Date Author Description 1.0 2015-08-21 Connie ZHOU Initial 2.0 2016-05-16 Ziv LIAO 1. Changed the document name from Fitness_Low_Power_Application_Note to GNSS_Low_Power_Mode_Application_Note 2. Added GLP mode GNSS_Low_Power_Mode_Application_Note Confidential / Released 2 / 12 Quectel Confidential

GNSS Module Series GNSS Low Power Mode Application Note Contents About the Document ................................................................................................................................... 2 Contents ....................................................................................................................................................... 3 1 Introduction .......................................................................................................................................... 5 2 Power Consumption ............................................................................................................................ 6 3 Quectel NMEA Packet Protocol .......................................................................................................... 7 3.1 Quectel NMEA Packet Format ......................................................................................................... 7 3.2 Packet Type: PQBAUD Set NMEA Port Baudrate ........................................................................ 7 3.3 Packet Type: PQFLP Set the Module into FLP Mode ................................................................... 8 3.4 Packet Type: PQGLP Set the Module into GLP Mode ................................................................. 9 4 Enter into or Exit from Low Power Mode ........................................................................................ 11 4.1 Enter into/Exit from FLP Mode ....................................................................................................... 11 4.2 Enter into/Exit from GLP Mode ...................................................................................................... 11 GNSS_Low_Power_Mode_Application_Note Confidential / Released 3 / 12 Quectel Confidential

GNSS Module Series GNSS Low Power Mode Application Note Table Index TABLE 1: AVERAGE CURRENT IN FLP MODE AND NORMAL MODE (L70 MODULE) .......................... 6 TABLE 2: AVERAGE CURRENT IN GLP MODE AND NORMAL MODE (L76 MODULE) .......................... 6 GNSS_Low_Power_Mode_Application_Note Confidential / Released 4 / 12 Quectel Confidential

GNSS Module Series GNSS Low Power Mode Application Note 1 Introduction Low power mode is an optimized solution for wearable fitness and tracking devices. It provides fitness low power (FLP) mode for Quectel GPS only modules and GNSS low power (GLP) mode for Quectel multi-GNSS modules to reduce power consumption with tiny accuracy trading-off. The low power mode can be easily set by using a specific message. In low power mode, the module has good route consistence in walking and running scenarios, and can switch dynamic duty operation automatically. It will come back to normal mode in difficult environment to keep good accuracy as well, thus realizing maximum performance with the lowest power consumption. This document is applicable to Quectel GNSS modules. GNSS_Low_Power_Mode_Application_Note Confidential / Released 5 / 12 Quectel Confidential

GNSS Module Series GNSS Low Power Mode Application Note 2 Power Consumption The average current in FLP/GLP mode is down to 5mA/7.3mA in static receiving, which is about 40% of normal mode. The power consumption may increase a little bit in dynamic scenario. The average current in different open sky scenarios in FLP/GLP mode and normal mode is shown in the table below. Table 1: Average Current in FLP Mode and Normal Mode (L70 Module) Scenario In FLP Mode (mA) In Normal Mode (mA) Static Walking Running Driving 5.0 5.4 5.5 8.5 12 12 12 12 Table 2: Average Current in GLP Mode and Normal Mode (L76 Module) Scenario In GLP Mode (mA) In Normal Mode (mA) 18 18 18 18 Static Walking Running 7.3 9.2 9.4 Driving 17.6 GNSS_Low_Power_Mode_Application_Note Confidential / Released 6 / 12 Quectel Confidential

GNSS Module Series GNSS Low Power Mode Application Note 3 Quectel NMEA Packet Protocol This chapter introduces the Quectel NMEA packet protocol which is a set of extension messages of the standard NMEA packet protocol. These messages are used to control the module to enable or disable FLP/GLP mode. The following table shows the structure of a Quectel NMEA packet. 3.1 Quectel NMEA Packet Format Preamble TalkerID PktType DataField * CHK1 CHK2 CR LF *The maximum length of each packet is restricted to 255 bytes. Packet Contents:  Preamble: One byte character: ‘$’  TalkerID: Two bytes character string: “PQ“  PktType: 1-10 bytes character string. An identifier used to tell the decoder how to decode the packet.  DataField: The DataFileld has variable lengths depending on the packet type. A command symbol ‘,’ must be inserted ahead of each data field to help the decoder to process the DataField.  * : 1 byte character. The star symbol is used to mark the end of DataField.  CHK1,CHK2: Two bytes character string. CHK1 and CHK2 are the checksum of the data between Preamble and ‘*’.  : Each NMEA message ends with ‘CR’ and ‘LF’. 3.2 Packet Type: PQBAUD Set NMEA Port Baudrate PQBAUD Set NMEA Port Baudrate Write Command Response $PQBAUD,W,*Checksu $PQBAUD,W,OK*Checksum m If error: GNSS_Low_Power_Mode_Application_Note Confidential / Released 7 / 12 Quectel Confidential

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