E2/E2 Lite
R20UT4582EJ0100 Rev.1.00
Page 13 of 30
Jul.16.19
2.5
Notes on Connection
Wiring patterns between the connector and the MCU must be as short as possible (within 50 mm is
recommended). Do not connect the signal lines between the connector and MCU to other signal lines on the
board.
For the handling of pins while the E2/E2 Lite is not in use, refer to the hardware manual for the MCU.
2.5.1
RES# Pin
The E2/E2 Lite uses the RES# pin.
If the user system includes a user logic reset circuit, the output signal from the reset circuit must be
connected to the RES# pin of the connector via an open-collector buffer as shown below. If there is no reset
circuit, the RES# pin from the connector must be directly connected to the RES# pin of the MCU.
- When a reset circuit is included
- When a reset circuit is not included
VCC
4.7 k
Ω
to 10 k
Ω
RES#
Connector
RES#
Connector
MCU
RES#
MCU
RES#
4.7 k
Ω
to 10 k
Ω
Reset
circuit
Open-collector
buffer
VCC
Figure 2.4 Connection of the RES# Pin
Do not install capacitors, series resistors, or filters on signal lines; if this is attempted, correct communication
may not be established.
