u-blox LEA-5 Series - Pin Description for Antenna Designs (LEA-5 Q;5 M)

LEA-5, NEO-5, TIM-5H - Hardware Integration Manual
GPS.G5-MS5-09027-A2 Released Design-in
Page 28 of 68
Function
PIN
No
I/O
Description
Remarks
UART
TxD1
3
O
Serial Port 1
Serial port output. Leave open if not used.
RxD1
4
I
Serial Port 1
Serial port input with internal pull-up resistor to VCC. Leave open if
not used. Don‖t use external pull up resistor.
USB
USB_DM
25
I/O
USB I/O line
USB2.0 bidirectional communication pin. Leave open if unused.
Implementation see Section 1.5.2.
USB_DP
26
I/O
USB I/O line
System
RESET_N
10
I
Hardware Reset
(Active Low)
Leave open if not used. Do not drive high.
TIMEPULSE
28
O
Timepulse
Signal
Configurable Timepulse signal (one pulse per second by default).
Leave open if not used.
EXTINT0
27
I
External
Interrupt
External Interrupt Pin.
Internal pull-up resistor to VCC. Leave open if not used.
CFG_COM1
/Reserved
9
I
Config. Pin
/Reserved
LEA-5S, LEA-5A: Leave open for default configuration.
LEA-5H, LEA-5T: Reserved
SDA2
1
I/O
DDC Pins
DDC Data. Leave open if not used.
SCL2
2
I/O
DDC Pins
DDC Clock. Leave open if not used.
Reserved
12
I
Leave open, do not drive low.
NC
5
Can be left open, but connection to VCC is recommended for
compatibility reasons. I/O voltage is always VCC.
NC
21-22
Not Connect
Leave open
NC
23
Not Connect
Leave open
Table 4: Pin description LEA-5H/5S/5A/5T
2.2.3 Pin description for antenna designs (LEA-5Q/5M)
Function
PIN
No
I/O
Description
Remarks
Power
VCC
6
I
Supply Voltage
Provide clean and stable supply.
GND
7, 13-15, 17
I
Ground
Assure a good GND connection to all GND pins of the module,
preferably with a large ground plane.
VCC_OUT
8
O
Connected to VCC. Leave open if not used.
V_BCKP
11
I
Backup voltage
supply
It‖s recommended to connect a backup battery to V_BCKP in order
to enable Warm and Hot Start features on the receivers. Otherwise
connect to GND (or VCC).
VDDUSB
24
I
USB Power
Supply
To use the USB interface connect this pin to 3.0-3.6V derived from
VBUS.
If no USB serial port used connect to GND.
VDDIO
5
I
I/O Voltage
Defines the I/O voltage. Do not leave open.
Antenna
RF_IN
16
I
GPS/GALILEO
signal input
from antenna
Use a controlled impedance transmission line of 50 Ohm to connect
to RF_IN.
Antenna bias voltage for active antennas is not provided on the
RF_IN pin. If an active Antenna is used an external voltage is
required (see Section 2.6.3).
VCC_RF
18
O
Output Voltage
RF section
Leave open
UART
TxD1
3
O
Serial Port 1
Serial port output. Leave open if not used.
RxD1
4
I
Serial Port 1
Serial port input with internal pull-up resistor to VCC. Leave open if
not used. Don‖t use external pull up resistor.
USB
USB_DM
25
I/O
USB I/O line
USB2.0 bidirectional communication pin. Leave open if unused.
Implementation see Section 1.5.2.
USB_DP
26
I/O
USB I/O line