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1. Outline
The PCA7755D is a converter board from 64-pin QFP (64P6U) to standard-pitch (2.54-mm). The pins correspond
one-to-one.
2. Connecting the Oscillator Circuit Pattern
Take notice that the processing depends on whether or not the IC1 (oscillator module) is used.
(1) When the IC1 (oscillator module) is used
Recommended oscillator module: SG-51P (Seiko Epson Corporation)
When using the IC1, the following processing is necessary (see (1) to (3) in Figure 1).
(1) Supply VCC and GND.
(2) Connect the OUT pin to the XIN pin.
(3) Install a bypass capacitor at the C1.
Figure 1 Connections when using the IC1
Figure 2 Connection diagram when using the IC1
14
(3)
IC2
1
VCC
IC2
1
14
5
6
C1
7
8
SG-51P
Vss
(2/4)
(2)
12
13
8
XTAL1
C3b
C3a
C2
Vcc
GND
Vcc
IC1-14, J1-14
Xin
IC1-12, J1-12
Vss
IC1-11, J1-11
Rf
Rd
(1)
11
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