R-IN32M3_15 Datasheet, PDF (73/105 Pages) Renesas Technology Corp – LSI for Industrial Ethernet

R-IN32M3 Series Data Sheet
4. Electrical Specifications
4.6 Power-on/off sequence
Power structure of the R-IN32M3 series is internal power (VDD10 : 1.0V) and I/O power (VDD33 : 3.3V) and PHY
power supply (VDD15 : 1.5V) . (PHY power is subject only R-IN32M3-EC.)
Power is recommended to put the I/O power (VDD33 : 3.3V) after switching on the internal power supply (VDD10 :
1.0V). In addition, power-off is recommend internal power-off(VDD1 : 1.0V) after cut-off of I/O power(VDD33 :
3.3V).
In the case of supplying internal power after I/O power,
Please note that I/O value becomes an indefinite due to uncertain mode while I/O is powered on but internal power
isn’t , regardless of an input(output)mode. Also, 3.3 V must be applied to the I/O pins only after applying the power
supply voltages.
Power on/off time difference, that regardless of the power-on sequence, it does not matter which power supply is
applied to (or removed from) the device first (VDD1/IVDD or VDD3/EVDD), but it is recommended to ensure 100ms or
less time difference between the application or removal of each power supply. The 100ms or less time measurement is
based on the period from 10% to 90% of each voltage range.
I/O voltage
（VDD33）
PHY voltage^Note
（VDD15）
Internal voltage
（VDD10）
GND
0.1 VDD10
100ms
0.9 VDD33
100ms
0.1 VDD10
Figure 4.1 Recommended sequence of Power-on/off
Note The timing for PHY power supply voltage VDD15 only needs to be observed, when the internal
regulator in the R-IN32M3-EC device is not used.
R18DS0008EJ0204
Dec 25, 2014
Page 73 of 100