Specifications

L70 Hardware Design
L70_HD_V1.0 - 15 -
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
VRESET
9
I
System reset, low
level active.
VILmin=-0.3V
VILmax=0.8V
VIHmin=2.0V
VIHmax=3.6V
If unused, keep this pin
open or connect it to the
VCC.
General purpose input/output
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
EXTINT0
5
I
External interrupt
input
VILmin=-0.3V
VILmax=0.8V
VIHmin=2.0V
VIHmax= 3.6V
This pin can be used to
enter or exit from the
standby mode. If unused,
keep this pin open.
Internally pulled up.
TIMEPULSE
4
O
Time pulse
VOLmin=-0.3V
VOLmax=0.4V
VOHmin=2.4V
VOHmax=3.1V
1 pulse per second (1PPS).
Synchronized at rising edge,
the pulse width is100ms. If
unused, keep this pin open.
UART port
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
RXD1
3
I
Receive data
VILmin=-0.3V
VILmax=0.8V
VIHmin=2.0V
VIHmax= 3.6V
TXD1
2
O
Transmit data
VOLmin=-0.3V
VOLmax=0.4V
VOHmin=2.4V
VOHmax=3.1V
RF interface
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
RF_IN
11
I
GPS signal input
Characteristic
impedance of 50Ω
Refer to chapter 4
ANTON
13
O
Active antenna or
external LNA control
pin in power standby
mode
The typical value is
2.8V.
This pin can be used to
control the power supply of
the Active antenna or the
enable pin of the external
LNA in the standby mode.
If unused, keep this pin
open.
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