User's Manual

8 P412 User’s Manual & Data Sheet
The user can interface to the P412 through either USB (standard USB Micro B connector), Serial
connection, or CAN. In addition, the user can request the P412 to report the board temperature.
The physical interface to the P412 is through a pigtail (not provided). Provisions for soldering the
pigtail to the board are provided. Each of the pigtail holes is also provided with a strain relief hole. If
desirable, the user can lace each of the pigtail wires through the strain relief hole before soldering at
the pad. Details are provided in Section 4.
The processor controls the UWB front end through a Digital Baseband FPGA interface. More
specifically, the FPGA configures the Time Doman P412 Pulser chip (UWB transmitter) and P412
Analog Front End (AFE) chip (UWB receiver), provides timing signals and out-going data, receives
incoming data and controls the position of the transmit/receive (T/R) switch.
There are three RF sections:
• The Pulser chip transmits a train of UWB pulses at the maximum allowable FCC transmit
levels. The Pulser chip is also provided with a variable attenuator that allows the user to
reduce the transmit power to as little as 19 dB below the FCC limit.
• Receive chain consists of gain stages and band pass filter.
• T/R switch supports two configurations: Transmit/Receive on Port A and Transmit on A,
Receive on B.