SC91215-A SILAN [Silan Microelectronics Joint-stock], SC91215-A Datasheet - Page 8

• Manufacturer Part Number: SC91215-A
• Description: T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

not be altered. The MODE IN status can only switch the DIALING mode from PULSE to DTMF after the first key
ectry.
KEYBOARD OPERATION
1. PULSE mode operation
pin is VDD or floating. The chip will pause for 824 ms automatically after it detects an Off-Hook condition or if the
2. DTMF mode operation
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Off Hook condition and the mode selection pin is floating (MODE IN = VDD or floating).
HFI
OFF Hook
ON Hook
D1
Dn (Dk)
Dn+1
Dn+m
*/T
RD
0
P
F
HFI
In the description below, signals are defined in terms of the key or switch, which is activated.
Symbol definitions:
Recommended Operation
a. Off Hook D1
DTMF mode is defined as the INTIAL mode if the mode selection pin MOD IN is V
b. Off Hook D1
a. Off Hook
PULSE mode is defined as the INTIAL mode, provided the first keyboard input is not the */T key following the
b. On Hook
Pulse mode is defined as the INITIAL mode, provided the key input
The dialing rate or make/break ratio is decided at the first key entry by checking the MODE IN status and will
key is depressed. It then proceeds with pulse or DTMF dialing if any keys have been depressed.
HFI
D1
means the phone is off the hook.
means the phone is on the hook.
represents for the first digit dialed in a string of digits.
represents for the last digit dialed in a string of digits.
represent for the beginning of a new string of digits.
represents for the last digit in a new string of digits.
represents for the switch that activates the HANDS-FREE DIALING mode going low.
is the Pulse-to-DTMF key.
is the Redial key.
is the Zero key.
is the Pause key.
is the Flash key.
D1
Dn or On Hook
Dn
Dn or On Hook
Dn
HFI
HFI
D1
*/T D1
Dn
Dn
SC91214/91215 SERIES
D1 is not */T while the mode selection
SS
.
REV:1.0
Page 8 of 16
2004.08.03