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5.4 Configuring the user power supply monitoring reset voltage
The user power supply monitoring reset voltage is preset to +3V when the product is shipped. Follow
the instructions in "■ Configuring the user power supply monitoring reset voltage" below to change
the setting of the user power supply monitoring reset voltage.
■ Configuring the user power supply monitoring reset voltage
[Preparation]
Use the following procedure to prepare to adjust the user power supply monitoring reset voltage (Vr).
1. Remove all of the cables such that there are no devices connected to this product.
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 DC variable power supply unit to the user power supply check pin. Refer to Figure 8
for the positions of the user power supply check pin and GND check pin.
[Configuration]
After the preparations are finished, use the following procedure to adjust the user power supply mon-
itoring reset voltage (Vr).
1. Turn on the power switch of the pseudo power-on debug adapter.
2. Turn on the power to the DC variable power supply unit, and set the voltage to the desired value
of Vr.
3. Rotate the knob on the trimpot for setting the reset voltage all the way to the right to set Vr to the
maximum value. Check that the "USER POWER" LED is off at this time. Refer to Figure 8 for
the position of the trimpot for setting the reset voltage.
4. Gradually turn the knob on the trimpot to the left to reduce the value of Vr. Continue turning the
knob until the "USER POWER" LED lights up. The voltage between the UVDDE and GND pins
at this time is the user power supply monitoring reset voltage.
5. 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.
Figure 8 Locations for connecting the DC variable power supply unit
) and the reset voltage (Vr) are independent parameters that are not related.
S
Trimpot for setting
the reset voltag
e
User power supply
check pins
9
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