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
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