Quectel BG770A-GL TE-A - Component & Interface Introduction

LPWA Module Series
BG770A-GL_TE-A_User_Guide 10 / 23
2.2. Component & Interface Introduction
Detailed information about components and interfaces of BG770A-GL TE-A is listed below.
Table 1: Components and Interfaces of BG770A-GL TE-A
SN
Component/Interface
Description
A
UART_AUX
Connects to auxiliary UART through CP2102N USB to UART bridge
with the highest baud rate at 3 Mbps.
B
External 1.8 V LDO
Provides additional 1.8 V voltage to PON_TRIG switch. Note that
when UART_DBG and UART_AUX are not connected with a USB
cable, LDO does not work.
C
UART_DBG
Connects to debug UART through CP2102N USB to UART bridge
with the highest baud rate at 3 Mbps.
D
PON_TRIG Switch
When the switch is at “1V8” state, PON_TRIG is pulled up high. At
“GND” state, PON_TRIG is grounded via a 100 kΩ resistor.
E
UART_DBG Test Points
Short-circuit these two test points (DEBUG_TXD and DEBUG_RXD)
and then reset the module via the RESET button on EVB, the
BG770A-GL enters the recovery mode.
F
GNSS Antenna Interface
GNSS antenna connector
G
Main Antenna Interface
Main antenna connector
H
Polymer Tantalum
Capacitor
According to tests, these two capacitors have a leakage current of
over 2 μA.
I
Automatic Power-on
Switch
Switching to “ON” turns on the power-on circuit automatically. When
VBAT rushes from 0 V to 3.3 V, the module will boot automatically. By
switching to “OFF”, the power circuit is disconnected automatically.
When the automatic power-on circuit is enabled, there is a constant
current consumption of about 700 μA.
J
CP2102N USB to UART
Bridges
For more information, see Chapter 3.1.
All other interfaces and test points, which are not mentioned in the table above, are reserved for
debugging purpose only - they are not for customers.
NOTE