Voltage Range Of Analog Power Supply Pins; Notes On Board Design - Renesas RX100 Series User Manual

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Voltage Range of Analog Power Supply Pins

If this MCU is used with the voltages outside the following ranges, the reliability of the MCU may be affected.

 Analog input voltage range

Voltage applied to analog input pins AN000 to AN007: AVSS0 ≤ VAN0 ≤ AVCC0

 Relationship between power supply pin pairs (AVCC0–AVSS0, VCC–VSS)

The following condition should be satisfied: AVSS0 = VSS.

A 0.1-μF capacitor should be connected between each pair of power supply pins to create a closed loop with the

shortest route possible as shown in Figure 26.34 , and connection should be made so that the following condition is

satisfied at the supply side: AVSS0 = VSS

When the 12-bit A/D converter is not used, the following conditions should be satisfied:

AVCC0 = VCC and AVSS0 = VSS

Figure 26.34

Power Supply Pin Connection Example

The board should be designed so that digital circuits and analog circuits are separated from each other as far as possible.

In addition, digital circuit signal lines and analog circuit signal lines should not intersect or placed near each other. If

these rules are not followed, noise will be produced on analog signals and A/D conversion accuracy will be affected. The

analog input pins (AN000 to AN007), and analog power supply (AVCC0) should be separated from digital circuits using

the analog ground (AVSS0). The analog ground (AVSS0) should be connected to a stable digital ground (VSS) on the

board (single-point ground plane connection).

R01UH0822EJ0100 Rev.1.00

Jul 31, 2019

26. 12-Bit A/D Converter (S12ADF)

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