ST3917B 查看數據表（PDF） - STMicroelectronics
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ST3917B Datasheet PDF : 16 Pages
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ST3917A - ST3917B
Figure 3 : Tone Mode Timing with Tone Indicator (Pin 24 to any row)
* Dial Se quenc e 1
FLASH 3
E NTE R
E NTE R
Keyb oard
1
Inp u t
*
3
Keyb oard
Scan
E NTE R
FLAS H
KEYBOARD SCAN
DTMF
Ou tp u t
(P in 17)
P ULSE
Ou tp u t
LE D
3
Tflas h
ON
OFF
3 : Debounce Time
E NTE R
3
3
ON
Figure 4 : Pulse Mode Timing with Lighted Dial LED (Pin 24 to VDD or GND)
* Dial S equ enc e 1
FLAS H 3
E NTE R
ENTE R
Keyb oa rd
1
Inp ut
*
3
Keyb oa rd
Scan
E NTER
F LAS H
KEYBOARD S CAN
DTMF
Ou tp u t
(P in 17)
P ULSE
Ou tp u t
3
Tflas h
3 : De bounce Time
ENTE R
3
3
LE D
ON
OFF
ON
Figure 5 : Pulse Mode Timing with Tone Indicator Using ”*” or ”Tone” Key
* Dia l Se qu en ce 1
FLASH LND
E NTER
ENTE R
Keyb oa rd
1
Inp ut
*
3
Keyb oa rd
Scan
ENTER
FLAS H
KEYBOARD S CAN
DTMF
O u tp u t
(Pin 17)
P ULSE
O u tp u t
LE D
OFF
3
Tflas h
ON
OFF
3 : De bounce Time
E NTER
LND
3
ON
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