5: Pin-out Information
GNSS Receiver Module A5135-H User Guide
21
5.2 Description A5135-H Signals
Table 4: Pin description A5135-H
Pin
Symbol
Function
Description
1 nRST
Input
Reset input, active low
2 V_BAK
Power Supply
Back - up pin of module for “super cap” or battery
3 VCC3V3
Power Supply
3.0 – 3.6 V DC
4 WAKEUP
Output
- Status of digital section, Push-Pull output
Low = OFF, KA (Keep Alive)-only, Hibernate, or Standby
mode
High = ON, operational mode
- Connect it to ON_OFF pin for self-start mode
5 Vout
Voltage Output
Permanent 3.3V voltage output for up to 20mA current max.
6 GND
Power Supply
Ground (power supply)
7 GPIO6
CTS
(SPI CLK)
Input
Configuration pin for communication mode.
•
Pull-up 10k to 3.3V for UART mode
•
Leave open for I2C mode
•
Leave open for SPI mode
8 GPIO7
RTS
(SPI CS)
Input
Configuration pin for communication mode.
•
Leave open for UART mode
•
Pull-down for I2C mode
•
Leave open for SPI mode
9 GND
Power Supply
Ground (power supply)
10 ANT_EXT
Antenna Input
Antenna signal / Z=50 Ohm (external active antenna input)
11 VANT
Power supply
Power supply antenna – provide according voltage (up to 5.0
VDC) - VANT feeds Pin 10 ANT_EXT
12 ANT_SW
Input
Antenna switch (LOW or open = internal antenna, HIGH = ex-
ternal antenna)
13 GPIO2
None
Leave open
14 NC
None
Leave open
15 NC
None
Leave open
16 TM_GPIO5
Output
Time Mark (1PPS signal) on the A5135-H is NOT for timing
applications.
17 NC
None
Leave open
18 NC
None
Leave open
19 ON_OFF
Input
Power control input.
High-level input initiates system transitions from OFF to ON,
Low-level input initiates an orderly transition to the OFF state
20 NC
None
Leave Open
21 TX / (SPI DO)
Output
Serial data output.
-NMEA output if configured for UART
-SPI data out pin when module works in SPI mode.
22 RX / (SPI DI) /
(Host Port
I2C_DIO)
Input
Serial data input.
-NMEA input if configured for UART
-SPI data input pin when module works in SPI mode;
-Host port I2C data I/O pin when module works in hist port I2C
mode.