參數(shù)資料
型號(hào)： LV737212M
文件頁(yè)數(shù)： 15/27頁(yè)
文件大?。?/td> 308K
代理商： LV737212M
LC737212 and LC737212M Operating Specifications
1. IC Internal Status
The LC737212 and LC737212M have 14 internal states. Table 1 presents a functional overview of these states. The
individual status bits have the following interpretations.
D4: SP-CTL output
D3: HOOK-SW information
D2: Memory store
D1: Hold (the HOLDOUT output)
D0: Dialing allowed.
However, note that during standby key acquisition, D1 and D2 do not have the above meanings.
Table.1 State Table
2. Dialing Output Specifications
Dialing output is possible in the off-hook dialing, on-hook dialing, and monitor modes.
The output pulse make percentage in pulse mode can be specified to be 33.2 or 39.3% with the BMR pin.
The output pulse rate in pulse mode can be set to be 10 or 20 pps with the DPR pin.
The LC737212 can generate 12 DTMF dialing signals in DTMF mode. (If serial input is used, it can generate 16
DTMF dialing signals.)
DTMF signals are output continuously as long as the corresponding key is held down.
The LC737212 guarantees a minimum DTMF output time of about 100 ms, and also guarantees a minimum IDP of
about 100 ms.
If the mode is changed (with the P/T pin or * key) during a pulse dialing operation and then DTMF data is keyed in,
the system automatically inserts a 3.9 second pause after completing the pulse dialing sequence and then outputs the
DTMF signals.
No. 5203-15/27
LC737212, 737212M
No.
State
HOOK-SW
Function
HOOK-
SP-
HOLD-
Dialing
Status bits
Notes
CTL
CTL
OUT
output
D4 to D0
1
Standby
ON
Key input by shorting key pins disabled.
OFF
OFF
OFF
Disabled
01000
2
Standby with
key acquisition
ON
Keypad input enabled. Only the keypad
data is output through the serial interface.
OFF
OFF
OFF
Disabled
01110
Switched to from
standby mode.
3
Off-hook dialing
OFF
Off-hook dialing mode
ON
OFF
OFF
Disabled
00001
4
Off-hook dialing with
key acquisition
OFF
Only the keypad data is output through the serial
interface. Data is not written to the redial memory.
ON
OFF
OFF
Disabled
00000
Switched to from off-
hook dialing mode.
5
On-hook dialing
ON
On-hook dialing mode
ON
ON
OFF
Enabled
11001
6
On-hook dialing with
key acquisition
ON
Only the keypad data is output through the serial
interface. Data is not written to the redial memory.
ON
ON
OFF
Disabled
11000
Switched to from off-
hook dialing mode.
7
Monitor
OFF
Monitor mode
ON
ON
OFF
Enabled
10001
8
Monitor with
key acquisition
OFF
Only the keypad data is output through the serial
interface. Data is not written to the redial memory.
ON
ON
OFF
Disabled
10000
Switched to from
monitor mode.
9
Off-hook hold
OFF
Hold mode
ON
ON
ON
Disabled
10010
Switched to from off-
hook dialing mode.
10
On-hook hold
ON
Hold mode
ON
ON
ON
Disabled
11010
Switched to from on-
hook hold mode.
11
On-hook store
ON
Memory store more (circuit disconnected)
OFF
OFF
OFF
Disabled
01100
Switched to from
standby mode.
12
Off-hook store
OFF
Memory store more (circuit connected)
ON
ON
OFF
Disabled
00100
Switched to from off-
hook dialing mode.
13
Off-hook dialing and store
ON
Memory store more (circuit connected)
ON
ON
OFF
Disabled
11100
Switched to from off-
hook dialing mode.
14
Monitor store
OFF
Memory store more (circuit connected)
ON
ON
OFF
Disabled
10100
Switched to from
monitor mode.
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