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PM8805 Datasheet(PDF) 22 Page - STMicroelectronics

Part # PM8805
Description  IEEE 802.3bt PoE-PD interface with embedded dual active bridge
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8805 Datasheet(HTML) 22 Page - STMicroelectronics

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DS12813 Rev 2
Figure 5. Classification signals and timings
Both CLS1 and CLS2 have been designed as voltage regulators, loaded by external class
resistors. Figure 6 depicts a simplified schematic of the classification circuits. During
Classification the voltage of the relevant CLS pins is set to Vcls (1.4 V typ.).
In order to set the PD requested class properly, CLS1 and CLS2 pins have to be loaded with
the resistors defined in Table 7.
Figure 6. CLS internal circuit



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