Siemens ET7 Series Spécifications Page 67

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DSB75 Development Support Board Rev. B1 Hardware Description
Strictly confidential / Released
s
DSB75_hd_v08 Page 67 of 94 29.09.2005
4.3 Indication of Power
There are two power control LEDs on the DSB75.
The green power control LED V431 is connected to the DSB75 supply voltage 3V0 which is
always available when the DSB75 receives an input voltage.
The yellow power control LED V430 is driven from the supply voltage VDD that is only active
if a module is connected and turned on.
4.4 Indication of I²C Lines
The LED V503 indicates that I2CCLK line is active (low).
The LED V504 indicates that I2CDAT line is active (low).
For detailed information see Figure 23.
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