R-IN32M4-CL3 User's Manual: Board design edition
2. Power/Reset Pins
R18UZ0074EJ0100
Page 2 of 61
Dec 24, 2019
2.
Power/Reset Pins
2.1
Power-On/Off Sequence
Table 2.1 lists external power supplies to R-IN32M4-CL3. In addition, Figure 2.1 and Figure 2.3 show the power-on/off
sequence.
There is no particular rule for the power-on sequence. We recommend supplying external power voltage VDD11 first and
then supplying external power voltage VDD33. On the other hand, when turning off the power, disconnect VDD33, then
VDD11.
If VDD33 is supplied first, note that the I/O modes of the I/O buffers are not fixed and outputs become undefined over
the period between VDD33 and VDD11 rising to their thresholds.
3.3 V must be applied to the input pins only after the power supply voltages have been applied.
Table 2.1 External Power Supply
External Power Supply
Voltage [V]
External Pin Name
VDD33
3.3
0.165
VDD33
VDDREG_33
AVDDREG_33
VDD25
2.5
0.125
VDD25A
VDD11
1.15
0.06
VDD11
VDD11A
PLL_VDD