User's Manual

28 P330 Data Sheet / User Guide
DRAFT
Fig.4-15: GPIO and associated connector and pin locations
4.6 Antenna Port
The P330 has one antenna port. It is designated as Port A. The connector used is a standard polarity
female SMA connector (Digi-Key part number J801-ND).
When connecting the port to an SMA cable or antenna, be careful not to overtighten the connection.
This can cause damage to the board. Beware of loose connections. They can degrade performance.
As long as the connectors are “finger-tight,” the system will work well. To insure an optimal
connection, the user should use a calibrated SMA torque wrench. They cost <$100.
The P330 is intended to be used with Time Domain’s Broadspec antenna. Using any other antenna
will require recertification to confirm compliance with the relevant emissions regulations. However,
it is possible to add passive extension cables between the antenna port and the antenna. Be aware that
using alternate UWB antennas, additional fixed attenuators, additional cabling and/or connectors will
change the RF time-of-flight electrical distance between the antenna port and the phase center of the
antenna. Failure to account for such changes will result in a bias error in range measurements.
4.7 RF Transmit and Receive Characteristics
The RF transmit and receive characteristics are determined by the Decawave DW1000 chip. Given
that, the most logical source of detailed technical information on the DW1000 can be found in the
documents DW1000 User Manual and DW1000 Data Sheet. While these data sheets are posted on
the Time Domain website, the best place for the most recent information is on the Decawave website.
However, the DW1000 has a great many different settings. Since the standard was developed largely
before regulations were put in place, some of these settings are either unwise to use or offer marginal
utility. For example, some of the RF Channel band edges fall outside the legal limits. If used,
J11 - Locking
1 SPI_MOSI
2 SPI_INT
3 SPI_MISO
7 SPI_CLK
9 SPI_CS
4 FPGA_GPIO_1_3.3V
6 FPGA_GPIO_2_3.3V
11 ARM_GPIO_0_3.3V
15 FPGA_GPIO_3_3.3V
J10 - User Mezzanine
1 SPI_MOSI
3 SPI_MISO
4 SPI_INT
6 FPGA_GPIO_1_3.3V
7 SPI_CLK
8 FPGA_GPIO_2_3.3V
9 SPI_CS
11 ARM_GPIO_0_3.3V
15 ARM_GPIO_1_3.3V
J8 - Ethernet Mezzanine
17 ARM_GPIO_0_1.8V
18 ARM_GPIO_1_1.8V
J6 - Factory Mezzanine
12 FPGA_GPIO_1_1.8V
18 FPGA_GPIO_0_1.8V
20 ARM_GPIO_2_3.3V