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TSB43AB21 Datasheet(PDF) 98 Page - Texas Instruments |
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TSB43AB21 Datasheet(HTML) 98 Page - Texas Instruments |
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98 / 109 page  7–7 7.5 Power-Class Programming The PC0–PC2 terminals are programmed to set the default value of the power-class indicated in the pwr field (bits 21–23) of the transmitted self-ID packet. Table 7–9 shows the descriptions of the various power classes. The default power-class value is loaded following a system (hardware) reset, but is overridden by any value subsequently loaded into the Pwr_Class field in register 4. Table 7–9. Power Class Descriptions PC0–PC2 DESCRIPTION 000 Node does not need power and does not repeat power. 001 Node is self-powered and provides a minimum of 15 W to the bus. 010 Node is self-powered and provides a minimum of 30 W to the bus. 011 Node is self-powered and provides a minimum of 45 W to the bus. 100 Node may be powered from the bus and is using up to 3 W. No additional power is needed to enable the link. 101 Reserved 110 Node is powered from the bus and uses up to 3 W. An additional 3 W is needed to enable the link. 111 Node is powered from the bus and uses up to 3 W. An additional 7 W is needed to enable the link. |
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