L76KB-A58

L76 Series Hardware Design

Manufacturer

unknown

Overview

Part: L76 Series from Quectel Wireless Solutions Co., Ltd.

Type: GNSS Module Series

Key Specs:

V_BCKP typical voltage: 3.3V
Tracking sensitivity: -165dBm

Features

Table 2: Feature

Feature	Implementation
GNSS	GPS+GLONASS @L76 GPS+BeiDou @L76B
Power Supply	Supply voltage: 2.8V~4.3V typical: 3.3V
Power Consumption	Acquisition: 21mA @-130dBm (GPS) Tracking: 15mA @-130dBm (GPS) Acquisition: 25mA @-130dBm (GPS+GLONASS) Tracking: 18mA @-130dBm (GPS+GLONASS) Acquisition: 23mA @-130dBm (GPS+BeiDou) Tracking: 18mA @-130dBm (GPS+BeiDou)
Receiver Type	GPS L1 1575.42MHz C/A Code GLONASS L1 1598.0625~1605.375 C/A Code BeiDou B1 1561.098MHz C/A Code
Sensitivity GPS+GLONASS (NOTE)	Acquisition: -148dBm Reacquisition: -160dBm Tracking: -165dBm
Sensitivity GPS+BeiDou (NOTE)	Acquisition: -148dBm Reacquisition: -160dBm Tracking: -163dBm
Time-To-First-Fix (EASY Enabled)	Cold Start: <15s average @-130dBm Warm Start: <5s average @-130dBm Hot Start: 1s @-130dBm
Time-To-First-Fix (EASY Disabled)	Cold Start (Autonomous): <35s average @-130dBm Warm Start (Autonomous): <30s average @-130dBm Hot Start (Autonomous): 1s @-130dBm
Horizontal Position Accuracy (Autonomous)	• <2.5 m CEP @-130dBm
Update Rate	Up to 10Hz, 1Hz by default
Accuracy of 1PPS Signal	Typical accuracy <15ns (Not support timeservice) Time pulse width 100ms
Velocity Accuracy	Without aid: 0.1m/s
Acceleration Accuracy	Without aid: 0.1m/s²
Dynamic Performance	Maximum Altitude: 18,000m Maximum Velocity: 515m/s Maximum Acceleration: 4G

UART port: TXD1 and RXD1
Supports baud rate from 4800bps to 115200bps, 9600bps by default
UART Port is used for NMEA output, MTK proprietary messages
input and firmware upgrade
Normal operation: -45°C ~ +85°C
Storage temperature: -45°C ~ +125°C
• Size: 10.1±0.15 × 9.7±0.15 × 2.5±0.15mm
Weight: Approx. 0.6g

NOTE

The sensitivity is measured with passive antenna but without external LNA. It might be higher by about 3dB with external LNA or only with active antenna.

2.3. Block Diagram

The following figure shows a block diagram of L76 series module. It consists of a single chip GNSS IC which includes RF part and Baseband part, a SAW filter, a TCXO and a crystal oscillator.

Figure 1: Block Diagram

2.4. Evaluation Board

In order to help you use L76 series module on your applications, Quectel supplies an Evaluation Board (EVB) with Micro-USB cable, active antenna and other peripherals to test the module.

For more details, please refer to the document [1].

2.5. Supported Protocols

Table 3: The Protocol Supported by the Module

Protocol	Type
NMEA	Input/output, ASCII, 0183, 4.0
PMTK	Input, MTK proprietary protocol

NOTE

Please refer to document [2] & [3] about NMEA standard protocol about MTK proprietary protocol.

Pin Configuration

Figure 2: Pin Assignment

Absolute Maximum Ratings

Absolute maximum rating for power supply and voltage on digital pins of the module are listed in following table.

Table 9: Absolute Maximum Ratings

Parameter	Min.	Max.	Unit
Power Supply Voltage (VCC)	-0.3	4.5	V
Backup Battery Voltage (V_BCKP)	-0.3	4.5	V
Input Voltage at Digital Pins	-0.3	3.6	V
Input Power at RF_IN (PRF_IN)		15	dBm
Storage Temperature	-45	125	°C

NOTE

Stressing the device beyond the "Absolute Maximum Ratings" may cause permanent damage. These are stress ratings only. The product is not protected against over voltage or reversed voltage. If necessary, voltage spikes exceeding the power supply voltage specification, given in table above, must be limited to values within the specified boundaries by using appropriate protection diodes.

5.2. Operating Conditions

Table 10: The Module Power Supply Ratings

Parameter	Description	Conditions	Min.	Type	Max.	Unit
VCC	Supply voltage	Voltage must stay within the min/max values, including voltage drop, ripple, and spikes.	2.8	3.3	4.3	V
$I_{VCCP}$	Peak supply current	VCC=3.3V			150	mA
V_BCKP	Backup voltage supply		1.5	3.3	4.5	V
VCC_RF	Output voltage RF section				VCC	V
TOPR	Full on operating temperature		-45	25	85	$^{\circ}$

NOTES

1. This figure can be used to determine the maximum current capability of power supply.
1. Operation beyond the "Operating Conditions" is not recommended and extended exposure beyond the "Operating Conditions" may affect device reliability.

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