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.
C1
IC2
Rf
XTAL1
Rd
Vcc
GND
1
8
C2
C3a
C3b
14
13
12
(1)
(2)
(3)
11
Figure 1 Connections when using the IC1
SG-51P
IC2
1
7
8
14
IC1-12, J1-12
C1
VCC
5
6
Vss
IC1-14, J1-14
IC1-11, J1-11
Xin
Vcc
Vss
Figure 2 Connection diagram when using the IC1
(2/4)
