SC91415AP View Datasheet(PDF) - Silan Microelectronics
Part Name
Description
Manufacturer
SC91415AP Datasheet PDF : 23 Pages
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Silan
Semiconductors
SC91415 SERIES
(continued)
Pin No.
AP BP CK
12 14 15
17 19 20
18 20 21
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-- 22
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Pin Name
DK
Description
Control signal inputs pin that is corresponding hook switch status.
When handset was left from cradle, this pin must be connected to
17
HKS “Low” level to operate all functions. Otherwise, this pin must be
connected to “High” level to disable all function and prevent power
consumption.
Pulse signal outputs pin that is NMOS open-drain output structure.
Normally, this pin stays “High impedance” level. In Pulse dialing mode
22
PO
and keypad was entry. This pin will output pulse trains signal that is
corresponding to keyboard 0 .. 9 keys.
Hold function output that is CMOS structure. Normally, this pin stays
“Low” level. When Hold function is executing, this pin will output
23
HDO
“High” level. This pin is designed to drive LED or peripheral circuit to
indicate line is at Hold status.
SDO function output that is NMOS open-drain structure. When there
is a valid entry on keyboard, this pin will output a serial data. This
24
SDO serial data is designed to drive LCD driver to display dialing number
on LCD screen or drive voice synthesizer to announce dialing number
to speaker.
The ring signal detect input pin which is internal pull up (built-in 100
kΩ resistor). While the Tel-ring is incoming, this pin must be
12 DRING
connected to “Low” with delay to indicate the ringing . Otherwise, this
pin must be connected to “High” level .
Ring mute output pin that is NMOS open-drain structure. The
RMUTE pin is designed to control microphone of handset to
prevent the illegal dialing from pocket dialer. If the DRING pin is at
“High” level , then Off-Hook or turn on Handfree, this pin will output
“Low” level. In other words, the DRING pin is used to check the
13 RMUTE phone that receives an incoming call ( DRING =Low input) or make
an outgoing call ( DRING = High input) . If the phone user make an
outgoing call ,then RMUTE pin activated to prevent the illegal
dialing from pocket dialer in the particular application. The RMUTE
can be restored to “High” level when the first key entry is not the
optioned lock-number .
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.0
2001-11-13
8
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