RX110_16 datasheet(95/108 Pages) RENESAS

Teilenummer	RX110

Bauteilbeschribung	32 MHz 32-bit RX MCUs, 50 DMIPS

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Hersteller	RENESAS [Renesas Technology Corp]

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R01DS0202EJ0120 Rev.1.20

Page 95 of 108

Jul 29, 2016

RX110 Group

5. Electrical Characteristics

5.9

Usage Notes

5.9.1

Connecting VCL Capacitor and Bypass Capacitors

This MCU integrates an internal voltage-down circuit, which is used for lowering the power supply voltage in the

internal MCU to adjust automatically to the optimum level. A 4.7-μF capacitor needs to be connected between this

internal voltage-down power supply (VCL pin) and VSS pin. Figure 5.54 to Figure 5.55 shows how to connect

external capacitors. Place an external capacitor close to the pins. Do not apply the power supply voltage to the VCL pin.

Insert a multilayer ceramic capacitor as a bypass capacitor between each pair of the power supply pins. Implement a

bypass capacitor to the MCU power supply pins as close as possible. Use a recommended value of 0.1 μF as the

capacitance of the capacitors. For the capacitors related to crystal oscillation, see section 9, Clock Generation Circuit

in the User’s Manual: Hardware. For the capacitors related to analog modules, also see section 27, 12-Bit A/D

Converter (S12ADb) in the User’s Manual: Hardware.

For notes on designing the printed circuit board, see the descriptions of the application note "Hardware Design Guide"

(R01AN1411EJ). The latest version can be downloaded from Renesas Electronics Website.

Figure 5.54

Connecting Capacitors (64 Pins)

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

54

55

51

49

50

52

53

56

57

58

59

60

61

63

64

62

RX110 Group

PLQP0064KB-A

PLQP0064GA-A

(64-pin LFQFP/LQFP)

(Top view)

AVSS0

AVCC0

Note. Do not apply the power supply voltage to the VCL pin.

Use a 4.7-µF multilayer ceramic for the VCL pin and place it close to the pin.

A recommended value is shown for the capacitance of the bypass capacitors.

Bypass

capacitor

0.1 µF

Bypass

capacitor

0.1 µF

Bypass

capacitor

4.7 µF

Bypass

capacitor

0.1 µF

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