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參數(shù)資料
| 型號(hào)： | LV737212M |
| 文件頁數(shù)： | 25/27頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LV737212M |
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When the K-TONE output is turned on, the MUTE1 output will operate in synchronization with the K-TONE
output.
When the HK-CTL output is turned on, key inputs due to shorting row pins and column pins will be accepted.
— When the SI/KEY pin is high, inputting the following code values serially can turn DTMF output on or off.
DTMF output
ON
4
(D1)
1
(D0)
*
(D3)
7
(D2)
5
(D5)
5
(D4)
0
(D7)
8
(D6)
6
(D9)
3
(D8)
#
(DB) 9
(DA)
B
(DD) A
(DC)
D
(DF) C
(DE)
DTMF output
OFF
(4E)
Other Serial Input Codes
— SREQ (F0 to FF)
These commands output the IC's internal status from the SOUT pin. All the status items are valid.
— 20
Turns key acquisition mode on or off.
— 46 (CLR)
Inputting the CLR code in memory store mode erases all stored dialing data.
— 4A (OHD-ON)
Inputting the OHD-ON code in standby mode switches the system to on-hook dialing mode. Input the DISCON
code (4F) to return to standby mode.
— 8D (pause)
This command corresponds to 3.9-second pause data.
— A2 (MC)
Changes the dialing data input mode plug from pulse to tone. This is represented as 1110 in memory.
This is ignored and not written to memory if the dialing data input mode is tone mode.
Note that codes marked as undefined in the serial code table are ignored.
Notes on serial input usage
— If the SI/KEY pin is switched from low to high and then to low again while a key is pressed, the LC737212/M will
receive two key presses for that key.
— TCLKD (The first SCLK input after the SI/KEY pin goes from low to high)
The LC737212/M monitors the SOUT output after SI/KEY goes high, and if there is no serial output due to a key
press after 3.5 ms or longer has elapsed, then it enables SCLK input. For all other cases, 35 ms or longer is
required.
— The IC will reliably output the status data from the SOUT pin if a status request command (FF) or a code 20
command in a mode other than hold or memory store mode is input. If this output does not appear for over 25 ms
(in cases other than serial readout from memory), the IC itself may have caused some sort of error. In such cases,
the IC must be re-initialized using the DISCON pin.
— We recommend always re-initializing the IC with the DISCON pin when receiving standby status. (At this time,
the IC will once again output the standby status data.)
No. 5203-25/27
LC737212, 737212M
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