- Lepton
3
x1 - Lepton
3
x4 - Technical Information Manual
10
3
HARDWARE INTERFACE
Introduction
An example R3101C Lepton
3
x1/R3104C Lepton
3
x4 system-level block diagram for an embedded system is
Fig. 3.1: Lepton3x1 R3101C/Lepton3x4 R3104C - Example of
Block Diagram. This figure shows the
electrical connections that may and must be made to control the R3101C Lepton
3
x1/R3104C Lepton
3
x4. In
the figure, the required connections are illustrated with solid lines. Recommended and optional
connections are illustrated with different dotted and dashed line patterns. More details for each
connection are listed in the following paragraphs.
Fig. 3.1: Lepton
3
x1 R3101C/Lepton
3
x4 R3104C - Example of Block Diagram
Required connections:
•
VDC_IN and GND are required to power the R3101C Lepton
3
x1/R3104C Lepton
3
x4.
•
RF is required to connect to the UHF RFID antenna/antennas.
•
UART Tx and Rx are required to communicate with the system host.
Recommended connections:
•
nRST is used to reset the R3101C Lepton
3
x1/R3104C Lepton
3
x4 if UART communication is not
available. This connection is highly recommended. This pin is internally driven strong low during
software resets, so it should only be driven externally by an open drain signal. It must not be driven
strong high.
•
TST and BSL_SEL shall be used for the FW recovery/upgrade procedure.
In order to start the Boot Strap Loader of Lepton
3
internal microcontroller NRST, TST and BSL_SEL
signals shall be driven as in the picture below:
