SC91415AP SILAN [Silan Microelectronics Joint-stock], SC91415AP Datasheet - Page 8

• Manufacturer Part Number: SC91415AP
• Description: TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

(continued)
12
17
18
--
--
--
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
14
19
20
--
--
--
Silan
Semiconductors
15
20
21
22
--
--
17
22
23
24
12
13
RMUTE
DRING
HKS
HDO
SDO
PO
Control signal inputs pin that is corresponding hook switch status.
When handset was left from cradle, this pin must be connected to
“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
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
“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
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
k
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
prevent the illegal dialing from pocket dialer. If the
“High” level , then Off-Hook or turn on Handfree, this pin will output
“Low” level. In other words, the
phone that receives an incoming call (
an outgoing call (
outgoing call ,then
dialing from pocket dialer in the particular application. The
can be restored to “High” level when the first key entry is not the
optioned lock-number .
RMUTE
resistor). While the Tel-ring is incoming, this pin must be
pin is designed to control microphone of handset to
8
DRING
RMUTE
= High input) . If the phone user make an
pin activated to prevent the illegal
DRING
DRING
pin is used to check the
Rev: 2.0
=Low input) or make
DRING
RMUTE
2001-11-13
pin is at