Caen RFID Lepton3x1, Technical Information Manual

Page: 27 / 35

EVALUATION BOARD - Lepton
3
x1 - Lepton
3
x4 - Technical Information Manual 27
External Connections
Please refer to Fig. 4.7: R4320CEVB Technical Drawing page 25.
J1: Power Supply connector: central pin (2.1mm diam.) is the negative terminal. The use of the Power
Supply for R4320CEVB (WALIM0000005) is recommended (see §
Ordering Options page 7).
J2: header for GPIO external connection
−
J2-1 = GPIO0 (in/out)
−
J2-2 = GPIO1 (in/out)
−
J2-3 = GND
−
J2-4 = GND
−
J2-5 = GPIO2 (in/out)
−
J2-6 = GPIO3 (in/out)
J3: Micro USB female connector, not supported by R3101C Lepton
3
x1/R3104C Lepton
3
x4 modules
J4: Micro USB female connector for UART via USB interface
J6: Header that can be used to connect UART signals to an external device (see § Electrical Schematic page
26 for details)
J7: Jumper that can be removed and connected to a multimeter terminals for module current consumption
measurements purposes.
Jumpers and Switches
Please refer to Fig. 4.7: R4320CEVB Technical Drawing page 25.
SW1
SW1: Press it to reset R3101C Lepton
3
x1/R3104C Lepton
3
x4 modules
SW2
SW2: Can be used to drive module GPIOs according to the following configurations:
SW open to be used when
- GPIO is configured as OUT
- GPIO is configured as IN and forced at LOW level
- GPIO is configured as IN and driven externally through J2
SW closed to be used when
- GPIO is configured as IN and forced at HIGH level
Fig. 4.9: SW2 configuration