參數(shù)資料
型號(hào): U3762MB
英文描述: Stellaris Programming Services
中文描述: 通用電話芯片-所有的功能集成
文件頁(yè)數(shù): 4/23頁(yè)
文件大?。?/td> 248K
代理商: U3762MB
U3762MB
Rev. A1, 15-Sep-98
Preliminary Information
4 (23)
Pin
Symbol
Function
Configuration
1
C1
Keyboard input
C1
VDD
VDD
ê
ê
2
C2
ê
ê
PD
3
C3
C2–C4
êê
4
C4
VDD
ê
PD =
D
evice
5
Earth
Earth key ( 604 ms high pulse, 1 s pause)
VDD
EARTH
ê
PD
6
HFI
Input with 200 k pull-down resistor.
HFI triggers HFO with each LH edge.
HFI
êê
PD
2
ê
7
HFO
Output will be toggled by each LH edge at
HFI.
HFO
êê
PD
8
9
XT
XT
A built-in inverter provides oscillation with an
inexpensive 3.579545-MHz crystal or ceramic
resonator
XT
VDD
VDD
VDD
VDD
XT
ê
ê
ê
ê
PD
PD
10
MFO
Output of DTMF
DTMF output frequency
Specified
(Hz)
R
1
697
R
2
770
R
3
852
R
4
941
C
1
1209
C
2
1336
C
3
1477
Actual
(Hz)
699
766
848
940
1216
1332
1472
Error
(%)
+0.28
–0.52
–0.47
–0.10
+0.57
–0.30
–0.34
MFO
VDD
VDD
ê
PD
ê
ê
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