MAX-8 / MAX-M8 - Hardware Integration Manual
UBX-15030059 - R05
Design
Page 10 of 31
Production Information
2
Design
2.1
Pin description
Function
PIN
No
I/O Description
Remarks
Power
VCC
8
I
Supply Voltage Provide clean and stable supply.
GND
1,10,12
I
Ground
Assure a good
GND
connection to all
GND
pins of the module,
preferably with a large ground plane.
V_BCKP
6
I
Backup Supply
Voltage
Backup supply voltage input pin. Connect to
VCC_IO
if not
used.
Antenna
RF_IN
11
I
GNSS signal
input from
antenna
The connection to the antenna has to be routed on the PCB.
Use a controlled impedance of 50
Ω
to connect
RF_IN
to the
antenna or the antenna connector. DC block inside.
VCC_RF
14
O
Output Voltage
RF section
Can be used for active antenna or external LNA supply.
LNA_EN
(MAX-M8C/Q
MAX-8C/Q)
Reserved
(MAX-M8W)
13
O
Active Antenna
Control
Ext. LNA control pin in power save mode.
LNA_EN
pin voltage level is
VCC_IO
-
Reserved
Leave open
UART
TXD
2
O
Serial Port
UART, leave open if not used, Voltage level referred
VCC_IO
.
Can be configured as TX Ready indication for the DDC
interface.
RXD
3
I
Serial Port
UART, leave open if not used, Voltage level referred
VCC_IO
System
TIMEPULSE
4
O
Timepulse
Signal
Leave open if not used, Voltage level referred
VCC_IO
PIO13/EXTINT
5
I
External
Interrupt
Leave open if not used, Voltage level referred
VCC_IO
Can be programmed on MAX-M8W as Open Circuit Detection
(
ANT_DET
)
SDA
16
I/O
DDC Pins
DDC Data. Leave open, if not used.
SCL
17
I
DDC Pins
DDC Clock. Leave open, if not used.
VCC_IO
7
I
VCC_IO
IO supply voltage. Input must be always supplied. Usually
connect to VCC Pin 8
RESET_N
9
I
Reset
Reset
V_ANT
(MAX-M8W )
Reserved
(MAX-M8C/Q
MAX-8C/Q)
15
I
Antenna Bias
Voltage
Connect to
GND
(or leave open) if passive antenna is used. If
an active antenna is used, add a 10
Ω
resistor in front of
V_ANT
input to the Antenna Bias Voltage or
VCC_RF
-
Reserved
Leave open
SAFEBOOT_N
18
I
SAFEBOOT_N For future service, leave OPEN
Table 2: Pinout MAX-8 / MAX-M8
2.1.1
Pin name changes
Selected pin names have been updated to agree with a common naming convention across u-blox
modules. The pins have not changed their operation and are the same physical hardware but with
updated names. The table below lists the pins that have changed name along with their old and new
names.
No
Previous Name
New name
13
ANT_ON
LNA_EN
Table 3: Pin name changes
