參數(shù)資料
型號(hào): WD-1
英文描述: MULTI-FUNCTION WATCHDOG CARD
中文描述: 多功能看門狗卡
文件頁數(shù): 22/49頁
文件大小: 569K
代理商: WD-1
Page 14
Electrical Options
Page 14
Blue Chip Technology Ltd.
01271013.doc
Internal
External
LKM
LKN
+Ve
-Ve
Internal Isolated +5V,
0V
Internal
External
LKM
LKN
+Ve
-Ve
External Isolated
+5V, 0V
LKH
LKG
Inverting
Configuration
LKH
LKG
Non-inverting
The normal input voltage for the opto-isolators is 5V. However, higher input
voltages can be used if the user changes the values of resistors R37 and R38.
The value of these resistors must be calculated to ensure that the current passed
through the opto-isolator will drop 1.5V constantly.
Required resistance = (Input Voltage-1.5)/0.01 Ohms.
The following table gives some typical examples using preferred resistor values.
Input Voltage
Resistor Value
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