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HWD232 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part # HWD232
Description  5V RS-232
PDF  4 Pages
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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HWD232 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

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HWD232
+5V RS-232 收发器
概述:
HWD232 是为 RS-232 和 V.28 所设计的接口芯片,片内内置的电荷汲送电压转换电路
可将+
5V电源输入转换为 RS-232所需的±10V电平,因而尤其适用于无法使用±12V
电源的场合。
HWD232 的驱动器和接收器在 20Kbit/s 数据传输率下适用于所有 EIA/TIA-232E
及
V.28/V.24 规范。接收器输入滞后电压典型值为 0.5V,这样在低速率传输并伴有一定噪声
干扰的情况下,仍可准确的进行数据交换。
器件应用:
电脑、掌上电脑、笔记本、电池供电设备、多支路
RS-232 网络等。
引脚功能:
引脚序号
符
号
功
能
1,3
C1+,C1-
VS+泵压电容
2
VS+
+
2Vcc 输出
4,5
C2+,C2-
VS-泵压电容
6
VS-
-
2Vcc 输出
7,14
T_OUT
驱动器输出端
8,13
R_IN
接收器输入端
9,12
R_OUT
接收器输出端
10,11
T_IN
驱动器输入端
15
GND
地
16
Vcc
电源(
+4.5 ~ +5.5)
电路应用:
1. 电容的选择:
电容类型的选择对
HWD232 的正确使用没有决定性的影响,建议使用陶瓷电容。为
了在不同的温度条件下确保正确的
RS-232 电平,在使用 0.1μF 电容时需要确认电容
值不随温度的改变而产生太大的变化。在不能确信的情况下请使用标识值更大的电容。
请观察电容的
ESR(有效串联阻抗)在不同温度下的值,因为该参数将影响 VS+和 VS
-上的纹波值。使用较大的电容(
10μ)以减小 VS+、VS—上的输出阻抗。
Chengdu Sino Microelectronics System Co., LTD
1


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