GEM1111

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GEM1111 - 1616A00

GEM1111

1. Overview

GEM1111 is a high-performance L1 GNSS positioning module with antenna built-in, which is developed on the base of the state-of-the-art Allystar Cynosure III Lite architecture.
It supports global civil navigation systems, including GPS, BDS, GLONASS, Galileo, and QZSS. Featured with SAW and LNA, GEM1111 achieves high positioning accuracy and short TTFF, especially in a rough urban environment.
It supports antenna supervisor and auto-switching between the built-in antenna and the external antenna. With a compact body and high performance, GEM1111 is widely applied to tracking applications, like automotive, consumer, and industrial tracking.

Feature

  • Supports GPS, BDS, Galileo, GLONASS, and QZSS systems Built-in LNA & SAW for better sensitivity
  • Supports A-GNSS
  • Supports geo-fence function
  • Ultra-low power consumption around 13 mA in tracking mode
  • Supports antenna supervision
  • Supports auto-switching between the built-in antenna and the external antenna


1.1 Specifications

Parameters Specification
GNSS tracking channels 72 channels, GPS/QZSS: L1C/A Galileo: E1 GLONASS: L1
Updating rate 1 Hz (Default), up to 5 Hz
Position accuracy < 1.5 m CEP @ Open Sky
Velocity accuracy 0.1 m/s CEP
Time accuracy 1PPS 20ns
Time to First Fix(TTFF) Hot start 1S
Cold star 28S
Sensitivity Cold start -149 dBm
Reacquisition -159dBm
Tracking -163dBm
Power supply 2.0-3.63 V, Typical 3.3 V
Power consumption Acquisition 15mA @3.3V
Tracking 13mA @3.3V
Standby mode 10uA
Serial Interface UART Default: 115200 bps
Protocol NMEA 0183 Protocol Ver.3.01/4.00 (Default)/4.10
Operating temperature -40~+85℃
Storage temperature -40~+85℃
Weight 7.5g
Dimessions 16*16*6.9mm

2.Pin description

2.1 Pin assignment

GEM1111 Pin Assignment


2.2 Detailed pin description

Function Symbol No I/O Decription
Power VDD 4 Power Main power supply voltage input.
GND 3,12 VSS Ground
AVDD_BAK 5 Power Backup power supply voltage input. Backup
power is needed in order to enable warm and hot
start features.
Backup power is a must for the system to work. If no backup power is available, connect AVDD_BAK to the main power supply.
Antenna RF_IN 11 I RF signal input. Use a controlled impedance of 50 for the routing from RF_IN pin to the antenna or the antenna connector.
UART TXD0 2 O UARTO serial data Tx.
RXD0 1 I UARTO serial data Rx.
Other PRTRG 7 I Mode selection or the trigger input in deep sleep mode to wake up the system.
RESET 10 I External reset, low active
1 PPS 6 O Setting for time pulse output (PPS). Leave it floating if not used.
AADET_N 8 O Active antenna detection
NC 9 Reserved. Leave it floating if not used.

3.ELECTRICAL CHARACTERISTICS

3.1 Absolute Maximum Rating

Symbol Parameter Min. Max. Unit
VDD Power input for the main power domain -0.5 3.6 V
AVDD_BAK Power input for the backup power domain -0.5 3.6 V
VImax Digital I/O pin input voltage -0.5 3.6 V
Tstorage Storage temperature -40 85 °C
Tsolder Solder reflow temperature -- 260 °C

3.2 IO Characteristics

3.2.1 PRRSTX and PRTRG

Symbol Parameter Condition Min. Typ. Max. Unit
IIZ Input leakage
current
-- -- -- +/-1 uA
VIH Input high voltage -- AVDD_BAK*0. 67 -- AVDD_BAK V
VIL Input low voltage -- 0 -- AVDD_BAK*0.27 V
VOH Output high
voltage
IOH=5.3 mA,
AVDD_BAK=3.3V
2.64 -- -- V
IOH=1.2 mA,
AVDD_BAK=1.8V
1.53 -- -- V
VOL Output low voltage IOL=3.9 mA,
AVDD_BAK=3.3V
-- -- 0.4 V
IOL=1.9 mA,
AVDD_BAK=1.8V
-- -- 0.45 V
Ci Input capacitancee -- -- -- 11 pF
RPU Pull-up resistance -- 35 -- 84

3.2.2 Others

Symbol Parameter Condition Min. Typ. Max. Unit
IIZ Input leakage current -- -- -- +/-1 uA
VIH Input high voltage -- VDD*0.67 -- VDD V
VIL Input low voltage -- 0 -- VDD*0.27 V
VOH Output high voltage IOH =5.3 mA, VDD=3.3V 2.64 -- -- V
VOL Output low voltage IOL =3.9 mA, VDD=3.3V -- -- 0.4 V
Ci Input capacitance -- -- -- 11 pF

Datasheet


Resource

ALLYSTAR_GNSS_Receiver_NMEA_Protocol_Specification

Common_Commands_Exclusive_to_Allystar