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參數(shù)資料
| 型號： | MC145446 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Single-Chip 300-Baud Modem with DTMF Transceiver |
| 中文描述： | 單芯片300波特調(diào)制解調(diào)器的雙音多頻收發(fā)器 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 264K |
| 代理商： | MC145446 |
MC145446A
12
MOTOROLA
Transmit Squelch
The 1–bit serial data (SQ) controls the transmit analog
squelch. The FSK signal, DTMF tones, single tone, and an-
swer tone are disabled, then TxA1 and TxA2 will be clamped
to VCC/2 when the transmit squelch goes to the Enable (SQ
= 1) state. The transmit squelch does not affect the external
signal from the DSI.
Table 5. Transmit Squelch Truth Table
SQ
Squelch
1
Enable
0
Disable
Channel
When the function mode is either on the FSK or analog
loopback mode, the transmit and receive channel is set up
with a 1–bit serial data (CH).
Table 6. Channel Truth Table
CH
Channel
1
1 (Originate)
0
2 (Answer)
Carrier Detect Time
The carrier and DTMF tone detect timing are determined
by two–bit serial data (CD1, CD0). The timing diagram is
shown in Figure 3.
Table 7. Carrier/DTMF Detect Time Truth Table
CD1
CD0
FSK Mode
Carrier Detect Time
(typ)
DTMF Receive Mode
Carrier Detect Time
(typ)
ton (ms)
450
toff (ms)
35
ton (ms)
toff (ms)
0
0
Reserved
0
1
10
35
25
25
1
0
10
20
30
35
1
1
70
15
40
25
Power–On Reset
When the power is switched on, this device is entered into
Power–Down Mode 2 by the internal power–on reset circuit.
STATUS REGISTER BIT MAP DESCRIPTION
Received Tone Frequency (D3 to D0)
This four–bit data (D3 to D0) indicates the received DTMF
tones. The first bit (D0) is presented at Data I/O on the rising
edge of E, and the following bits (D1–D2–D3–D0–D1– ...)
are shifted out and presented on the next rising edge of SCK.
The data configuration corresponding to each tone is
shown in Table 4.
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