NTE1731 데이터 시트보기 (PDF) - NTE Electronics
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NTE1731 Datasheet PDF : 5 Pages
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(N = 1 to 9), followed by the address (1 to 9) of the memory location into which the number is to be
stored. This operation requires 300ms before going Off–Hook or reinitiating the store function. In-
formation present in the LND buffer is replaced when new data is entered and cannot be recalled.
Automatic Dialing
The automatic dialing function is implemented by going Off–Hook and entering a ∗ N (N = 1 to 9),
followed by the address (1 to 9) of the desired telephone number. Dialing will begin with the valid entry
of the address dey, and can be interrupted by initiating a new radial command. The LND buffer will
contain the information last entered. A key sequence of ∗ 0 will cause the last number entered
to be redialed.
Normal dialing is performed when telephone numbers are input in the Off–Hook mode.
Pause Continue Command
The NTE1731 permits pauses to be programmed within the 1 to 15 digits of the telephone number.
This pause is input and stored in memory with the # key. If a pause code is detected during automatic
dialing, the dialing operation is suspended. Any key except the ∗ key is used to dial in data after the
pause, once the inter digital–pause time passes (CONTINUE command).
Normal dialing
Normal dialing is performed when telephone numbers are input in Off–Hook mode.
Sample Operation:
Example 1
1. On–Hook
2. Input “621–1221”
3. Input “**5”
“621–1221” is written into the memory buffer
“621–1221” is stored in location 5.
4. Off–Hook
5. Input “**5”
“621–1221” is automatically dialed
Example 2
1. Off–Hook
2. Input PBX access code “42”
“42” is written into memory and dialed.
3. While waiting for dial tone, enter “#” “#” is written into memory.
4. Dial “1–234–621–1221”
The number is written into memory and dialed.
5. On–Hook
6. Input “**3”
“42 #1–234–621–1221” is transmitted to location 3.
7. Off–Hook
8. Input “*3”
“42” is dialed, then a pause occurs.
9. Enter ”3” (CONTINUE Command) “1–234–621–1221” is dialed.
while waiting for a dial tone.
Pin Description
VDD (Pin1)
Pin1 is the positive power supply pin with respect to the GND pin. Maximum input voltage is 6.0 Volts
Test Input (Pin2)
Pin2 is for testing the device. It should be connected to GND.
Keyboard Inputs (Pin3, Pin4, Pin5, Pin11, Pin12, Pin13, and Pin14)
The key entry is defined by either a single ROW being connected to a single COLUMN, or GND level
being simultaneously applied to both a ROW and a COLUMN. Consequently,either a single contact
or a standard 2–of–7 keyboard with GND common can be used.
Keyboard Inputs (Pin3, Pin4, Pin5, Pin11, Pin12, Pin13, and Pin14) (Cont’d)
The NTE1731 keyboard input pins are totally static until a valid key input is sensed. The oscillator
is then enabled and the rows and columns are alternately scanned (pulled high, then low) to verify
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