Chapter 4 Connections

4.5 Installing a Bypass Capacitor for DVCC

If the evaluation MCU has an integrated digital power supply ( DVCC pin), a bypass capacitor can be mounted on the digital power supply as required.When it does not have a digital power supply (DVCC pin) in Evaluation MCU, a bypass capacitor does not need to be mounted.

Installing a Bypass Capacitor

To use a polarized capacitor such as an electrolytic capacitor as the bypass capacitor, install it ac- cording to the polarity defined by the silk pattern on the PC board. Use meticulous care to check the polarity.

Select the appropriate capacitor so that its type, capacitance, and withstand voltage are best suited for the operating environment.

Figure 4-5-1 shows how to install the capacitor. Table 4.5-1 lists the signal names of digital power supply pins of the evaluation MCU plugged in each capacitor mounting socket.

Index ( − )

Capacitor

(A long pin is plus polarity.)

It is cautious of the polarity of a capacitor!

16V 10

Capacitor mounting socket

+

Figure 4.5-1 Mounting the Capacitor

Table 4.5-1 The Signal Names of Digital Power Supply Pins of the Evaluation MCU

Capacitor mounting socket name

Correspondence

Evaluation MCU pin

signal line

number

 

 

 

 

SC4, 5

PF2

127

 

 

 

SC6, 7

PD3

241

 

 

 

SC8, 9

P85

36

 

 

 

SC10, 11

P65

39

 

 

 

24

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Image 31
Fujitsu MB2198-130 operation manual Installing a Bypass Capacitor for Dvcc, Index − Capacitor Long pin is plus polarity