SC91214 Ver la hoja de datos (PDF) - Silan Microelectronics
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SC91214 Datasheet PDF : 16 Pages
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SC91214/91215 SERIES
KEYBOARD OPERATION
• Symbol definitions:
In the description below, signals are defined in terms of the key or switch, which is activated.
OFF Hook
means the phone is off the hook.
ON Hook
means the phone is on the hook.
D1
represents for the first digit dialed in a string of digits.
Dn (Dk)
represents for the last digit dialed in a string of digits.
Dn+1
represent for the beginning of a new string of digits.
Dn+m
represents for the last digit in a new string of digits.
HFI ↓
*/T
represents for the switch that activates the HANDS-FREE DIALING mode going low.
is the Pulse-to-DTMF key.
RD
is the Redial key.
0
is the Zero key.
P
is the Pause key.
F
is the Flash key.
• Recommended Operation
1. PULSE mode operation
a. Off Hook D1 … Dn
PULSE mode is defined as the INTIAL mode, provided the first keyboard input is not the */T key following the
Off Hook condition and the mode selection pin is floating (MODE IN = VDD or floating).
b. On Hook HFI ↓ D1 … Dn
Pulse mode is defined as the INITIAL mode, provided the key input D1 is not */T while the mode selection
pin is VDD or floating. The chip will pause for 824 ms automatically after it detects an Off-Hook condition or if the
HFI ↓ key is depressed. It then proceeds with pulse or DTMF dialing if any keys have been depressed.
The dialing rate or make/break ratio is decided at the first key entry by checking the MODE IN status and will
not be altered. The MODE IN status can only switch the DIALING mode from PULSE to DTMF after the first key
ectry.
2. DTMF mode operation
a. Off Hook D1 … Dn or On Hook HFI ↓ D1 … Dn
DTMF mode is defined as the INTIAL mode if the mode selection pin MOD IN is VSS.
b. Off Hook D1 … Dn or On Hook HFI ↓ */T D1 … Dn
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0 2004.08.03
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