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5.3 Configuring the power supply threshold voltage
The power supply threshold voltage is preset to +4V when the product is shipped. Follow the instruc-
tions below "■ Changing the power supply threshold voltage" to change the power supply threshold
voltage.
■ Changing the power supply threshold voltage
[Preparation]
Use the following procedure to prepare to adjust the power supply threshold voltage (V
1. Connect this product to the adapter board without the evaluation MCU mounted, and remove all
other cables.
2. Connect the included AC adapter to the power supply connector on the pseudo power-on debug
adapter such that the power is able to be supplied.
3. Connect a voltage meter between the VCC and GND pins on the adapter board such that V
be measured from the VCC pin. Refer to Figure 7 for the positions of the VCC and GND check
pins.
[Configuration]
After the preparations are finished, use the following procedure to adjust the power supply threshold
voltage (V
1. Turn on the power switch of the pseudo power-on debug adapter.
2. Rotate the trimpot for setting the threshold voltage to adjust V
knob on the trimpot to the right to reduce the value of V
Refer to Figure 7 for the position of the trimpot for setting the threshold voltage.
3. Turn off the power switch of the pseudo power-on debug adapter.
Note : The threshold voltage (V
Although it is possible to change only one of these settings, make sure that the settings do not conflict
with the function specifications.
Adapter board ↓
VCC
TP2
TP3
ON
GND
1 2 3 4 5 6
Figure 7 Positions of the measurement and control components
Note : Because the distance between the VCC and GND pins on the adapter board is small, there is a risk of
a short circuit if the leads of the voltage meter come into contact with each other. If the pins are in con-
tact when the voltage meter is connected, try measuring between VCC (TP1) and GND (TP3), or be-
tween VCC (TP2) and GND (TP4).
8
).
S
) and the reset voltage (Vr) are independent parameters that are not related.
S
Power supply
measurement pins
VCC
GND
Pseudo power-on debug adapter ↑
PON RST
TP1
TP4
to the desired voltage. Turn the
S
and to the left to increase the value.
S
Trimpot for setting
the threshold voltage
)
S
.
can
S
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