Specifications

L70 Hardware Design
L70_HD_V1.0 - 22 -
input.
The default output NMEA type setting is RMC, VTG, GGA, GSA, GSV, GLL.
 UART port supports the following data rates:
4800, 9600, 14400, 19200, 38400, 57600, 115200.
The default setting is 9600bps, 8 bits, no parity bit, 1 stop bit .
 Hardware flow control and synchronous operation are not supported.
The UART port does not support the RS-232 level but only supports the CMOS level. If the module’s
UART port is connected to the UART port of a computer, it is necessary to add a level shift circuit
between the module and the computer. Please refer to the following figure.
9
8
7
6
5
4
3
2
1
15
14
8
9
11
12
5
7
6
10
4
26
2
27
13
18
20
21
16
17
19
22
23
24
3
1
25
28
GND
To PC serial port
3.3V
T5OUT
/SHUTDOWN
V+
GND
V-
VCC
T4OUT
T2OUT
T3OUT
T1OUT
R3IN
R2IN
R1IN
/STATUS
3.3V
ONLINE
R1OUT
R2OUT
R3OUT
/R1OUT
T5IN
T4IN
T3IN
T2IN
T1IN
C2+
C2-
C1-
C1+
Module
RXD1
TXD1
Figure 11: RS-232 level shift circuit
3.8. ANTON
The ANTON is an optional pin which can be used to control the power supply of active antenna or the
enable pin of the external LNA. The recommended circuit diagram is shown in Figure 12. When L70
module enters the standby mode, the ANTON pin will be pulled down, the Q1 and Q2 are in high
impedance state and the power supply for antenna is cut off. In normal mode, the voltage value of
ANTON is about 2.8V, it will make Q1 and Q2 in the on-state, then VCC_RF will provide power
supply for the active antenna. Figure 13 has shown the timing between the ANTON pin and the
EXTINT0 pin.
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