L50 Hardware Design
L50_HD_V1.0 -9-
2
. Product Concept
L50 is a GPS ROM-based module with embedded GPS patch antenna and features fast acquisition
and tracking with the latest SiRF Star IV technology. This module provides outstanding GPS
performance in a slim package. Based on an external optional EEPROM which provides capability of
storing ephemeris and downloading patch codes through UART, L50 can support Standalone and
A-GPS (CGEE function). Advanced jamming suppression mechanism and innovative RF architecture,
L50 provides a higher level of anti-jamming and ensures maximum GPS performance. The module
supports location, navigation and industrial applications including autonomous GPS C/A, SBAS
(WAAS or EGNOS) and A-GPS. Furthermore, a patch antenna has been designed into the L50
module. This will reduce customers’ design complexity greatly.
L50, in SMD type, can be embedded in customer applications via the 24-pin pads with the slim
16 x 28 x 3mm package. It provides all hardware interfaces between the module and host board.
The multiplexed communication interface: UART/I2C/SPI interface.
The Dead Reckoning I2C interface up to 400Kbps can be used to connect with an external
EEPROM to save ephemeris data for CGEE function and to store patch codes.
The module is RoHS compliant to EU regulation.
2.1 Key Features
Table 3: Module key features
Feature
Implementation
Power supply
supply voltage: 1.71V – 1.89V typical : 1.8V
Power consumption
Acquisition 45 mA @ -130dBm
Tracking 35 mA @ -130dBm
Hibernate 20uA
Receiver Type
GPS L1 1575.42MHz C/A Code
48 search channels
Sensitivity
¹
Cold Start (Autonomous) -148 dBm
Reacquisition
-160dBm
Hot Start -160 dBm
Tracking -163 dBm
Navigation -160 dBm
Time-To-First-Fix
¹
Cold Start (Autonomous) <33s
Warm Start (Autonomous) <33s
Warm Start
(With CGEE) 10s typ.
Hot Start (Autonomous) <1s
Horizontal Position Accuracy
<2.5 m CEP
Max Update Rate
1Hz
Quectel
Preliminary
