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參數(shù)資料
| 型號(hào)： | XE1486L |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大小： | 56K |
| 代理商： | XE1486L |
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XECOM
(4)
XE1486
XE1486 Pin Descriptions
PIN
1
NAME
Ring
DESCRIPTION
Ring provides half of the two-wire connection to the telephone network, RJ-11 Pin 4.
A 1500 volt barrier isolates Ring from all other circuits. This isolation must be pre-
served throughout the system. The battery voltage on Ring may be positive or negative
with respect to Tip.
2
Tip
Tip provides half of the two-wire connection to the telephone network, RJ-11 Pin 3. A
1500 volt barrier isolates Tip from all other circuits. This isolation must be preserved
throughout the system. The battery voltage on Tip may be positive or negative with re-
spect to Ring.
3, 4
Not Used
No Connection should be made to these pins.
5
SPK
SPK provides the audio output to a speaker. Speaker output is controlled by the ATL
and ATM commands. The input impedance to the speaker driver must be greater than
300 ohms.
6-9
N/C
No Connection
10
TXD
TXD provides serial data input from the host. A logic high represents a "Mark" and a
low represents a "Space".
11
RXD
RXD provides serial data output to the host. A logic high represents a "Mark" and a
low represents a "Space".
12
/V-D
The Voice-Data output can be used to drive an external relay for switching between the
modem and handset connected to the same telephone line.
13
/DTR
Data Terminal Ready is an active low input to the modem. The AT&D command sets
the function of DTR.
14
/DSR
Data Set Ready is an active low output from the modem. Its operation is determined by
the AT&S command.
15
/RI
Ring Indicator is an active low output which marks the presence of a ring on the line.
16
/CTS
The XE1486 uses Clear to Send for hardware flow control. With hardware flow control
active the modem raises \CTS to signal the host that the modem's transmit data buffer is
nearly full. When the buffer empties, the modem reactivates CTS.
17
/DCD
Data Carrier Detect goes low to indicate receipt of a valid incoming carrier. The
AT&C1 command enables the carrier detect function.
18
N/C
No Connection
19
VCC
VCC provides the +5 volt power required by the modem.
20
GND
Ground provides the common reference for the XE1486.
21
RST
This active high input causes a hardware reset in the XE1486. The reset pulse must be held high
for at least 10 milliseconds to correctly reset the modem.
22
RTS
The modem uses Request to Send for hardware flow control. The modem stops sending data to
the host when the hosts raises /RTS. The modem resumes transferring data to the host when the
host activates /RTS
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