SC91710AS SILAN [Silan Microelectronics Joint-stock], SC91710AS Datasheet - Page 6

• Manufacturer Part Number: SC91710AS
• Description: T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

(Continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
SC91710A SC91710B
10
11
12
Pin No.
12
13
14
10
9
Pin Name
TONE
HFI
HFO
HKS
PO
* Hook switch input pin.
* When the handset is in ON-HOOK state, this pin must be pulled
* When in OFF-HOOK state, the
* Pulse output signal pin.
* NMOS open drain output structure.
* The output is “ LOW” during pulse dialing and Flash operation,
* Dual Tone Multi-frequency output pin.
* In TONE mode, when an entry of digit key (include *, # key), this pin
* The TONE pin provides minimum tone duration and minimum
* Handfree input control pin.
* Toggle input structure, falling edge trigger.
* It is used to enable and disable Handfree function.
* With waveshaped by a built-in Schmit trigger, the bounce of input
* A built-in pull down resistor is 200k typical.
* Handfree output control pin.
* Inverter output structure (normally ‘ low’ , active ‘ high’ ).
* When the Handfree function is enable (HFO=1), after OFF-HOOK
* When a HFI pin is active, Handfree function will be enabled (HFO=1)
otherwise this output is “ floating” .
intertone pause time to support rapid key-in. If key-in time is less than
100ms, DTMF signal will last for 100ms; otherwise the tone duration
will last as long as the key is pressed.
action, it can reset Handfree function and HFO pin return to ‘ low’
state.
will send out a corresponding DTMF signal.
“ high” in order to disable the dialing operation and decrease the
power consumption.
all function operation.
can be eliminated by external R, C debounce circuit.
or disable (HFO=0).
Description
HKS
pin must be pulled “ low” state for
REV:2.2
SC91710A/B
Page 6 of 18
2007.03.07