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參數(shù)資料
| 型號： | MSM7715 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Multi-Function Telecommunication LSI |
| 中文描述： | 多功能通信大規(guī)模集成電路 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大小： | 150K |
| 代理商： | MSM7715 |
Semiconductor
MSM7715
13/21
Operation mode selection
By setting the MODE1 to MODE3 pins, an operation mode can be selected (see Table 1). The call
progress tone detector (CPT DET.) can be operated in the DTMF signal transmit mode and
modem mode. However, since the carrier detector is also used for the call progress tone detector,
only rectangular waveform output is available in modem mode. Set CPW = "1" when activating
the call progress tone detector in a modem mode.
Table 1 Operation Mode Table
* means active.
Note:
The carrier detecor may malfunction within 40 ms after the operating mode is changed
from the DTMF or power down mode to the modem mode.
Therefore, ignore an output signal from
CD
and RD during this period of time.
DTMF mode setting procedure after power-on or after releasing power-down mode
The following is a recommendable procedure to use DTMF mode after power-on or after
releasing power-down mode.
(1)
Put power-on or release power-down mode.
(2)
Set DTMF signal transmit mode.
PON
="0", TEN="1"
(3)
Wait more than 20 ms, V
DD
must be more than 2.5 V after this wait time.
(4-1)
In the case of DTMF receive, set DTMF signal to receive mode.
(4-2)
In the case of DTMF transmit, it is possible control transmit enable (
TEN
).
Modem mode setting procedure after power-on
The following is a recommendable procedure to use Modem mode after power-on.
(1)
Power on.
(2)
Set
PON
="1",
TEN
="1" and
RS
="1". Set mode to be used.
(3)
More than 200
m
s after V
DD
becomes more than 2 V, set
PON
="0".
(4)
Wait more than 20 ms. V
DD
must be more than 2.5 V after this wait time.
(5)
It is possible to control transmit output. Ignore an output signal from
CD
and RD of
more than 40 ms which includes the wait time of term (4).
MODE
3
0
0
0
0
1
1
1
1
1
0
1
0
1
0
1
0
1
2
0
0
1
1
0
0
1
1
CPT DET.
CPW = "0"
*
CPW = "1"
*
FSK
MODEM
DTMF
GEN.
*
Functional Block
Operation Mode
DTMF
REC.
DTMF mode
Modem
mode
Normal
operation
Test
mode
DTMF signal transmit
DTMF signal receive
Originate (O)
Answer (A)
Analog loopback
(ALB)
Remote digital
loopback (RDLB)
O
A
O
A
*
*
*
*
*
*
*
*
*
*
*
*
*
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