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參數(shù)資料
| 型號： | XE9624GS2 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 64K |
| 代理商： | XE9624GS2 |
XECOM
(3)
XE1414B
PIN
NAME
DESCRIPTION
XE1414B Pin Descriptions
1
NC
No Internal Connection
2
AR
Auxiliary Data/Voice Relay, Active High Output, TTL/CMOS. The AR signal goes high when ever
the modem is in the on-hook state. It can be connected to an external relay to switch control of the
telephone line between the modem and an auxiliary handset when.
3
RXD
Received Data, Output, TTL. Serial data output to the host. A logic "High" on RXD represents a
"mark" and a logic "Low" represents a "space".
4-8
NC
No Internal Connection
9
\DTR
Data Terminal Ready, Output, active Low, TTL. The "AT&D" command sets the function of DTR.
The default, AT&D2, requires the host to assert DTR to permit a modem link. The modem drops the
call in progress if DTR is revoked and will not connect until DTR is re-asserted.
10
TST3
Test 3 is used for manufacturing test only. It has no function in normal operation.
11
\CTS
Clear to Send, Output, active Low, TTL/CMOS. CTS is used as a Flow Control output from the
modem. The modem revokes CTS with hardware flow control active to signal the host that the
modem's input buffer is full. The modem reasserts CTS when the buffer can accept more data without
a buffer overflow.
12
NC
No Internal Connection
13
TXD
Transmit Data, Input, TTL. Serial data input from the host. A logic "High" represents a "mark" and a
Low represents a"space", TTL.
14
\RTS
Request to Send, input, active LOW, TTL. The XE1414B uses RTS for hardware flow control. When
RTS is revoked; hardware flow control is enabled, and the modem will not place data on RXD.
15
NC
No Internal Connection
16
\RI
Ring Indicator, Output, active Low, TTL. When low indicates the modem is receiving a ring signal.
18
TIP
Tip connection to the phone line(RJ11 pin3) from the internal DAA. The XE1414B is not sensitive to
the battery voltage polarity across Tip and Ring.
20
RING
Ring connection to the phone line(RJ11 pin4) from the internal DAA.
21
GND
Ground (0 volts)
22
AMP
Audio Output function is set by L & M commands and the value in register S22. This output can drive
a minimum load of 300 ohms.
27, 28
TST1, TST2 Test 1 and Test 2 are used for manufacturing test only. They have no function in normal use. These
pins connected to the telephone line side of the telephone interface circuit so isolation must be
maintained between these signals and all other circuits.
30
OH
Off-Hook, Output, active High. OH indicates the modem's hookswitch relay is closed. Hookswitch
closure connects the modem to the telephone line. This signal is available only on the XE1414B.
36
RESET
Hardware reset pin, Input, active High, TTL. A high on Pin 1 initiates a hardware reset. An external
reset is not required or recommended. The Reset pulse must be a minimum of 100 milliseconds long.
38
\DCD
Data Carrier Detect, Output, active Low, TTL/CMOS. &C sets the DCD function. In the default
condition, AT&C1, DCD indicates the presence of a carrier signal on the telephone line.
39
\DSR
Data Set Ready, Output, active Low, TTL/CMOS. &S sets the DSR function. In the default condition,
AT&S0, DSR is forced true.
40
Vcc
+5 Volts
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