參數(shù)資料
型號(hào)： MC145572AFN
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 8/52頁(yè)
文件大?。?/td> 0K
描述： IC TRANSCEIVER ISDN 44-PLCC
標(biāo)準(zhǔn)包裝： 26
類(lèi)型： 收發(fā)器
規(guī)程： RS232
電源電壓： 5V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 44-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 44-PLCC（17.525x17.525）
包裝： 管件
17
MC145572EVK
2.4
EIA-232 INTERFACE
The MC145572EVK provides one connector for communication between a remote ASCII terminal and the
on-board microcontroller Serial Communications Interface (SCI). J16 resides on the NT1 side. The
connector is an industry standard DB-25 type and bring, transmit, and receive data on- or off-board via
Motorolas MC145407 + 5 V EIA-232D Driver/Receiver.
The option is also provided to swap the Transmit and Receive pins with respect to the ASCII terminal data
connector. This appears in the form of a set of jumpers located near J16. With the jumpers populated as
in case 1 in Figure 2-3, the receive signal is present on pin 2 and the transmit signal on pin 3 (Rx2 Rx2
and Tx3 Tx3). Conversely in case 2, Rx2 Rx2 and Tx3 Tx3, the transmit signal is present on pin 2
and the receive on pin 3. This option is useful when the user must use a cable in which the Tx/Rx polarity
at pins 2 and 3 is not known. Pin 7 of both J16 is circuit board ground all other pins (1, 4 6, 8 25)
are no connects.
Figure 2-3. EIA-232 Interface Schematic
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Rx2
DO3Tx3
DI3
MC145407
1*
2**
Rx INPUT
Tx OUTPUT
TO MCU RECEIVE
DATA IN
FROM MCU
TRANSMIT DATA OUT
GROUND
DATA
TO/FROMASCII
TERMINAL
Rx3Tx2
Tx3Rx2
J16
* Rx3Tx2, with jumpers populated on this vertical column.
** Tx3Rx2, with jumpers populated on this vertical column.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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