FUJITSU MB2198-130 - Manual (Page 31)

24
4.5 Installing a Bypass Capacitor for DVCC
■ 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.
Figure 4.5-1 Mounting the Capacitor
Table 4.5-1 The Signal Names of Digital Power Supply Pins of the Evaluation MCU
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.
Capacitor mounting socket name
Correspondence
signal line
Evaluation MCU pin
number
SC4, 5 PF2 127
SC6, 7 PD3 241
SC8, 9 P85 36
SC10, 11 P65 39
+ −
16V 10
Index (
−
)
Capacitor
(A long pin is plus polarity.)
Capacitor mounting socket
It is cautious of
the polarity of a
capacitor!
Chapter 4 Connections