參數(shù)資料
型號(hào)： LV737212M
文件頁數(shù)： 9/27頁
文件大小： 308K
代理商： LV737212M
SOUT-ENA
Normaly set high. Serial output and Dial output are enabled when this pin is set high.
HOLD OFF IN
Hold mode is cleared when a falling edge is detected on this pin. HOLD-OFF pin inputs are not accepted for the 0.5
seconds immediately following a transition to on-hook hold mode.
ON-HOOK-DIAL IN
This pin toggles an on/off state on each input falling edge. When the telephone is on hook, this pin toggles the on/off
state of on-hook dialing mode. When the telephone is off hook, this pin toggles the on/off state of monitor mode.
SI/KEY
The keypad is set to input mode when this pin is set low. When this pin is set high, serial input is enabled. In this state,
all keypad inputs are pulled up by built-in resistors, and the pins C6 to C8 function as the serial interface input pins.
C6 = serial clock input
C7 = serial data input
C8 = strobe input
OFF-HOOK
This pin is the hook state switching input.
DPR
This pin is the dialing pulse rate switching input. (H: 20 pps, L: 10 pps)
P/T
This pin is the dialing signal switching input. (H: pulse, L: DTMF) This pin can only switch from pulse to DTMF. This
allows mixed-mode dialing, i.e. switching modes during dialing.
DISCON IN
Setting this pin low switches the LC737212/M to low power mode and forcibly stops the oscillator circuit. All outputs
are turned off in low power mode. (The n-channel open-drain outputs go to the high-impedance state, and the
complementary outputs go low.) The internal states of the LC737212/M are reset when this pin goes high.
We recommend setting the DISCON pin low when power is first applied, and setting it high after the power-supply
voltage (V
DD
) has reached or exceeded 1.5 volts.
BMR
This pin sets the break/make ratio for the dialing pulse output. (H: 33.2%, L: 39.2%)
OFF/ON-HOOK STORE
This pin switches the memory storing mode.
H: Off-hook store (Memory stored with the telephone line connected.)
L: On-hook store (Memory stored with the telephone line disconnected.)
No. 5203-9/27
LC737212, 737212M
Off-hook input
On-hook Dial input
Status
H
H
STANDBY
H
L
ON-HOOK DIAL
L
H
OFF-HOOK DIAL
L
L
MONITOR
1 to 10 k
0.1 to 10 μF
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