Quectel EG91 Series Hardware Design page 21

SMS
(U)SIM Interfaces
Audio Features
PCM Interface
USB Interface
UART Interface
SPI Interface
Rx-diversity
GNSS Features
AT Commands
Network Indication
Antenna Interfaces
EG91_Series_Hardware_Design
 Text and PDU modes
 Point-to-point MO and MT
 SMS cell broadcast
 SMS storage: ME by default
 Support 1.8 V and 3.0 V (U)SIM cards
 Support one digital audio interface: PCM interface
 GSM: HR/FR/EFR/AMR/AMR-WB
 WCDMA: AMR/AMR-WB
 LTE: AMR/AMR-WB
 Support echo cancellation and noise suppression
 Used for audio function with external codec
 Support 16-bit linear data format
 Support long frame synchronization and short frame synchronization
 Support master and slave mode, but must be the master in long frame
synchronization
 Compliant with USB 2.0 specification (slave only); the data transfer
rate can reach up to 480 Mbps
 Used for AT command communication, data transmission, GNSS
NMEA sentences output, software debugging, firmware upgrade and
voice over USB
 Support USB serial drivers for: Windows 7/8/8.1/10, Linux 2.6–5.12,
Android 4.x–11.x, etc.
Main UART:
Used for AT command communication and data transmission

Baud rates reach up to 921600 bps, 115200 bps by default

Support RTS and CTS hardware flow control

Debug UART:
Used for Linux console and log output

115200 bps baud rate

Provides a duplex, synchronous and serial communication link with the

peripheral devices.
Dedicated to one-to-one connection, without chip selection.

1.8 V operation voltage with clock rates up to 50 MHz.

 Support LTE/WCDMA Rx-diversity
Protocol: NMEA 0183

 Data update rate: 1 Hz by default
 Compliant with 3GPP TS 27.007 and 3GPP TS 27.005
 Quectel enhanced AT commands
 NETLIGHT pin for network activity status indication
 Main antenna interface (ANT_MAIN),
LTE Standard Module Series
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