Quectel LC79D User Manual

GNSS Module Series
LC79D Hardware Design
LC79D_Hardware_Design 17 / 42
1PPS
4
DO
One pulse per
second
V
OL
max=0.4V
V
OH
min=VCC-0.45V
V
OH
nom=1.8V
Synchronized on
rising edge, and the
pulse width is 5ms.
If unused, keep this
pin open.
BOOT
25
DI
Module startup
mode control
V
IL
min=-0.3V
V
IL
max=0.35×VCC
V
IH
min=0.65×VCC
V
IH
max=VCC+0.3V
While keeping the
pin floating during
startup, the module
will enter normal
working mode.
While keeping the
pin at high level for
about 100ms during
startup, the module
will enter host mode.
LNA_EN
13
DO
Active antenna
power control in
standby mode
V
OL
max=0.4V
V
OH
min=VCC-0.45V
V
OH
nom=1.8V
If unused, keep this
pin open.
GND
1, 10,
12, 28
GND
All GND pins should
be connected to
ground.
RESERVED
6, 7, 9,
15, 24,
26, 27
RESERVED
Keep them open.
Host Mode Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
REQ
21
DO
Data availability
indication, used to
indicate whether
there is data
available for
reading
V
OL
max=0.4V
V
OH
min=VCC-0.45V
V
OH
nom=1.8V
High level: there is
data available for
reading.
Low level: no data is
available for reading.
AP_REQ
19
DI
AP request
to send
V
IL
min=-0.3V
V
IL
max=0.35×VCC
V
IH
min=0.65×VCC
V
IH
max=VCC+0.3V
High level: notify the
module that the AP
has data to be sent.
Low level: data
transfer has been
completed.
RDY
20
DO
Module status
indication, used to
indicate whether
the module is
V
OL
max=0.4V
V
OH
min=VCC-0.45V
V
OH
nom=1.8V
RDY is used in
conjunction with
AP_REQ and is a
status/ready signal

Quectel LC79D Specifications

General

Brand	Quectel
Model	LC79D
Category	Control Unit
Language	English