- Lepton
9
- Technical Information Manual
27
Connector Descriptions
J4 and J6 are the host USB micro connectors. They allow a PC host to connect to the UART1 and UART2
communication ports of the Lepton
9
R9100C module via the USB-UART ICs U3 and U4 respectively. Please
note that such connectors do not provide power to the board.
J13 is the power supply connector, the central pin (2.1mm diam.) is the negative terminal. The use of the
WALIM0000005 Wall mount AC-DC power supply is recommended (see § Development Kit). Maximum
power consumption is 1.5A.
J1 is the antenna select jumper and its function has been above described.
J2 is the SMA antenna connector. This port can be connected to any 50 ohm characteristic impedance UHF
RFID antenna, and with the proper selection of the antenna selection jumper J1, the antenna will be
connected to the Lepton
9
R9100C
’
s RF port.
J12 is a coaxial switch connector (Hirose MS-156HF) that can be used to perform measurements directly at
RF output pin of Lepton
9
R9100C. Verification of the circuit performance is accomplished by simply
inserting the external plug (i.e. Hirose MS-156-HRMJ-H1) in the board mounted receptacle. This action re-
directs the circuit from normal condition to the plug side. Removing the plug restores circuit to its normal
condition.
J3 is a breakout header for the IOs of the Lepton
9
R9100C as well as a few other signals on the board,
including the power supplies. It can be used to both monitor and control the signals on the board. If an
arbitrary host is to be used to control the Lepton
9
R9100C, it can be connected to the UART Tx and Rx
signals using this header as well as which Raspberry Pi GPIOs will be connected to each signal, when using
the Raspberry Pi “HAT” head
er J7.
J7 is the Raspberry Pi
“HAT” header which a
llows the WRHML37XEVBX evaluation board to be stacked on
top of a Raspberry Pi single board computer (SBC). It connects power and ground, UART Tx and Rx, as well
as the other IOs of the Lepton
9
R9100C.
J5 is the series curren
t “IDD” jumper. It al
lows a series current measurement to be performed while the
Lepton
9
R9100C is operating. If no series current measurement is desired, the jumper should be populated
with a short, so that the Lepton
9
R9100C receives power.
J9 is the BOOT recovery connector, it has no customer-facing functionality, and can be safely ignored.
Switch Descriptions
SW1 is a pushbutton that can be used to reset the Lepton
9
R9100C.
SW2 and SW3 connect or disconnect from the USB-UART IC
s module’s UART1 and UART2 re
spectively
according to the following configuration:
•
SW2 closed to be used when UART1 via USB interface is used (connection to PC via J4 connector)
•
SW2 open to be used when UART1 interface is used directly connected to external device (i.e. when
the board is plugged in a Raspberry PI via HAT connector J7 or it is connected to external
controller via the breakout header J3)
•
SW3 closed to be used when UART2 via USB interface is used (connection to PC via J6 connector)
•
SW3 open to be used when UART2 interface is used directly connected to external device (i.e. when
the board is plugged in a Raspberry PI via HAT connector J7 or it is connected to external
controller via the breakout header J3)
Fig. 5.4: SW2 and SW3 configuration
