SC91415AP SILAN [Silan Microelectronics Joint-stock], SC91415AP Datasheet - Page 15

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

J) Ring detector
The Ring detector is designed to prevent illegal dialing from pocket dialer. Following the procedures ( i,ii,iii ), this
dialer will detect
keyboard entry. In actual application of the
handset to prevent that the dialing signal (DTMF) is coupling by the Microphone of the phone handset. (such as
pocket dialer)
i. In idle state,
ii. In idle state, turn on handfree function.
iii. The flash operation ( F key ).
RMUTE
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
stays “High impedance”. If
Silan
Semiconductors
HKS
XMUTE
KEY IN
XMUTE
KEY IN
DTMF
OSC.
HDO
SDO
DTMF
OSC.
DRING
HKS
HDO
SDO
HKS
PO
KT
PO
KT
is from “High” to “Low” (pick up handset action).
Tdb
pin to control
Tdly
2
2
Tidp
Td
Tdb
DRING
Tkt
DTMF mode operating timing
Pulse mode operating timing
RMUTE
Tm
RMUTE
Titp
is detected a “High” level, the
TbTm Tb Tm
pin is recommended connection to microphone of the phone
output level. If
15
3
Tidp
3
DRING
RMUTE
is detected a “Low” level, the
Hi-impedance
Hi-impedance
Titp
Rev: 2.0
will output “Low” until
2001-11-13