ZED-F9P-Integration Manual
UBX-18010802 - R02
8 Design Page 103 of 114
Advance Information
Pin No Name I/O Description Remark
40 USB_DP I/O USB data Leave open if not used
41 GND - Ground Outer ground pin
42 TXD / SPI MISO O Host UART output if D_SEL =
1(or open). SPI MISO if D_SEL
= 0
At least UART1 should be connected to host.
43 RXD / SPI MOSI I Host UART input if D_SEL =
1(or open). SPI MOSI if D_SEL
= 0
At least UART1 should be connected to host.
44 SDA / SPI_CS_N I/O DDC Data if D_SEL = 1 (or
open). SPI Chip Select if
D_SEL = 0
Leave open if not used
45 SCL / SPI_CLK I/O DDC Clock if D_SEL = 1(or
open). SPI Clock if D_SEL = 0
Leave open if not used
46 TX_READY O TX_Buffer full and ready for
TX of data
I2C bytes ready for transmission indicator if
needed. Leave open if not used
47 D_SEL I Interface select for pins
42-45
Leave open if not used. UART1 will be default
48 GND - Ground Outer ground pin
49 RESET_N I RESET_N Leave open if not used. Not a POR function. Will
cold start receiver
50 SAFEBOOT_N I SAFEBOOT_N (for future
service, updates and
reconfiguration, leave OPEN)
Leave open if not used, provide test point for
future use
51 EXTINT I External Interrupt Pin Leave open if not used
52 Reserved - Reserved Do not connect
53 TIMEPULSE O Time pulse Leave open if not used
54 Reserved - Reserved Do not connect
Table 24: ZED-F9P pin assignment
Connect all inner ground pins to top ground layer and use ground vias.
8.9.7 Layout design-in checklist
• Is the ZED-F9P placed away from any heat source?
• Is the ZED-F9P placed away from any air cooling source?
• Is the ZED-F9P shielded by a cover/case to prevent the effects of air currents and rapid
environmental temperature changes?
• Is the ZED-F9P placed as recommended in the Layout and Layout Guidance section?
• Assure a low serial resistance on the VCC power supply line (choose a line width > 400 um).
• Keep the power supply line as short as possible.
• Add a ground plane underneath the GNSS module to reduce interference. This is especially
important for the RF input line.
• For improved shielding, add as many vias as possible around the micro strip/coplanar waveguide,
around the serial communication lines, underneath the GNSS module, etc.
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