E1/E20/E2/E2 Lite Additional Document 2. Designing the User System
R20UT2937EJ0301 Rev.3.01 Page 23 of 45
Jul 1, 2020
2.5.3 GND
The pins of the connector marked "GND" must be at the same ground level as the VSS pin of the MCU.
2.5.4 VDD
Connect the VDD of the connector to the VDD (power supply) of the user system.
Use the emulator within the power supply voltage of 1.8 V to 5.5 V and within the operating voltage
range of the MCU.
When power is supplied to the user system from other than the emulator, the E1/E20/E2/E2 Lite
consumes the power supply for the last output and first input buffers of the emulator.
E1: 3.3 V: approximately 20 mA, 5.0 V: approximately 40 mA
E20: 3.3 V: approximately 40 mA, 5.0 V: approximately 100 mA
E2: 3.3 V: approximately 20 mA, 5.0 V: approximately 40 mA
E2 Lite: 3.3 V: approximately 20 mA, 5.0 V: approximately 40 mA
The E1/E2/E2 Lite can supply power to a simple evaluation system.
E1: Can supply power of 3.3 V or 5.0 V, up to 200 mA.
E2: Can supply power of 1.8 V to 5.0 V, up to 200 mA.
E2 Lite: Can supply power of 3.3 V, up to 200 mA.
When using the power supply function of the E1/E2/E2 Lite, check the voltage supplied to the user
system. Particularly when the 5.0-V supply option is selected, the voltage depends on the USB VBUS
power-supply voltage.
E1: The voltage may drop by 0.5 V or more below 5.0 V.
E2: The voltage may drop by 0.3 V or more below 5.0 V.
The on-chip debugging circuit in the device operates during on-chip debugging. Therefore current
consumption of the device increases. When correctly evaluating current consumption of the device, do
not connect the E1/E20/E2/E2 Lite.
Power supply from the E1/E2/E2 Lite depends on the quality of the USB power supply of the host machine, and
as such, precision is not guaranteed. When writing a program that requires reliability, do not use the power
supply function of the E1/E2/E2 Lite. Use a stable, separate power supply for the user system. When writing a
program for mass production processes, use the Renesas Flash Programmer.
For details on the programming software, refer to:
https://www.renesas.com/RFP
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