HM91710A 데이터 시트보기 (PDF) - ELAN Microelectronics
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HM91710A Datasheet PDF : 19 Pages
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HM91710A/B
TONE/PULSE SWITCHABLE DIALER
Symbol
TONE
HFI
HFO
Function
Dual Tone Multi-frequency output pin.
In TONE mode, when a entry of digit key (include * , # key), this pin will sent out a corresponding
DTMF signal.
The TONE pin provides minimum tone duration (tTD),& minimum intertone pause time to support rapid
key-in. If key-in time is less than t , DTMF signal will last for t , otherwise the tone duration will
TD
TD
last as long as the key is pressed.
Handfree input control pin.
Toggle input sturcture, falling edge trigger.
It is used to enable and disable Handfree function.
With waveshaped by a built-in Schmit trigger, the bounce of input can be eliminated by external R,
C debounce circuit.
A built-in pull up resistor is 200K typical.
Handfree output pin.
Inverter output structure (normally "low", active "high").
When a HFI pin is active, Handfree function will be enabled (HFO=1) or disabled (HFO=0).
When the Handfree function is enable (HFO=1), after OFF-HOOK action, it can reset Handfree
function and HFO pin return to "low" state.
FUNCTION DESCRIPTION
Keyboard Operation
Symbol definitions:
a). ↑
: OFF-HOOK or enable Hand Free function.
b). ↓
: ON-HOOK or disable Hand Free function.
c). D .....D : Digit key; 1,2,3,4,5,6,7,8,9,0,*,# (C .....C is same as D .....D ).
1
n
1
n
1
n
d). DP1... DPn : Pulse digit ; 1,2,3,4,5,6,7,8,9,0, (CP1... CPn is same as DP1... DPn).
e). Dt1....Dtn : Tone digit ; 1,2,3,4,5,6,7,8,9,0,*, # (Ct1....Ctn is same as Dt1....Dtn).
f). tF
: Flash time.
g). t
P
: Pause time.
h). tPT
: Pulse to Tone wait time.
i). tFP
: Pause time for flash.
j). tRP
: Pause time for redial.
k). LNB : Last number redial buffer.
A. Normal Dialing
1. Digit Dialing
Procedure : ↑ D1,D2 . . . . . ., Dn↓
Dial out : Dt1, Dt2 . . . . . . ., Dtn in tone mode
Dial out : Dp1, Dp2 . . . . . ., Dpn in pulse mode
LNB
: D1, D2 . . . . . . Dn
* This specification are subject to be changed without notice.
1.7.2002 4
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