Quectel LC79D User Manual

GNSS Module Series
LC79D Hardware Design
LC79D_Hardware_Design 11 / 42
1)
The default GNSS configuration of LC79D is GPS+BeiDou+GLONASS+Galileo+QZSS+IRNSS. For
more details about the GNSS configuration, please refer to document [1].
2.4. Block Diagram
The following figure shows the block diagram of LC79D module. The module includes a single-chip GNSS
IC, two LNAs, two SAW filters, a diplexer, a flash (for LC79D (A) only), a TCXO and a crystal oscillator.
The diplexer integrates a band-pass filter inside which can improve the out-of-band rejection. Thus the
LNAs will have less chance to produce in-band interference in challenging environments (with a cellular
module transmitting B13 at the same time for example), and provide LC79D with better performance in
anti-jamming.
UART Interface
 One UART interface for LC79D (A) Support baud rate from
115200bps to 921600bps; 115200bps by default
 UART port is used for NMEA output and firmware upgrade
SPI Interface
 One SPI interface for LC79D (B)
 Operate as a slave
 Fixed data frame size of 8 bits
I2C Interface
 One I2C interface, working on master mode
 Support Standard mode (100kbps), Fast mode (400kbps), Fast
mode Plus (1Mbps), and High-Speed mode (3.4Mbps)
 Support 7-bit and 10-bit addresses
Temperature Range
 Operation temperature range: -40°C to +85°C
 Storage temperature range: -40°C to +90°C
Physical Characteristics
 Size: (10.1±0.15)mm × (9.7±0.15)mm × (2.4±0.20)mm
 Weight: approx. 0.42g
NOTE

Quectel LC79D Specifications

General

Brand	Quectel
Model	LC79D
Category	Control Unit
Language	English