參數(shù)資料
型號: HCD404669
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
中文描述: 低電壓如同在微機芯片的DTMF產(chǎn)生電路(帶雙音多頻電路的低電壓微計算機)
文件頁數(shù): 44/142頁
文件大小: 894K
代理商: HCD404669
HD404669 Series
44
Circuit Configuration
Circuit Constants
Crystal oscillator
(X1, X2)
X1
C
1
2
C
X2
Crystal
oscillator
GND
L
S
C
R
S
C
0
X1
X2
Crystal oscillator: 32.768 kHz: MX38T
(Nippon Denpa)
C
1
= C
2
= 20 pF
±
20%
R
S
=14 k
C
0
=1.5 pF
Notes: 1. Circuit constants differ by the different types of crystal oscillators, ceramic oscillators, and with the
stray capacitance of the board, so consult the manufacturer of the oscillator to determine the
circuit parameters.
2. The wiring between the OSC
1
, OSC
2
(X1 and X2 pins), and the other elements should be as short
as possible, and must not cross other wiring. Refer to figure 26.
3. If not using a 32.768-kHz crystal oscillator, fix the X1 pin to V
CC
and leave the X2 pin open.
GND
GND
X2
X1
RESET
OSC
2
OSC
1
TEST
Figure 26 Typical Layouts of Crystal and Ceramic Oscillator
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