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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM8801 датащи(PDF) 24 Page - STMicroelectronics |
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PM8801 датащи(HTML) 24 Page - STMicroelectronics |
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24 / 37 page  PD interface PM8801 24/37 DocID018560 Rev 2 In case of thermal shutdown, MPS is released, making sure that current consumption is below the threshold and allowing the PSE to detach the PD. When the PM8801 is powered by an auxiliary source (see Section 6 ), the MPS current is not activated. Figure 10. Sleep mode with pulsed MPS current Ch1: ENSL, Ch2: VSS-RTN. Ch3: Iinput, Ch4: 5Vout 4.7 LED driving The PM8801 features a current-driven LED output. The LED is enabled when the ENDC pin is driven high, or automatically enabled in sleep mode. The LED driver sources a PWM current at 250 Hz frequency and 12 mA typical amplitude. The LED brightness is adjustable connecting a resistor RDC at 1% accuracy between DIM and VSS. The correspondence between duty-cycle and resistor values are shown in the following Table 8. Table 8. LED duty cycle selection LED duty cycle D RD [Ω] 0>1 M 15% 453 k 33% 243 k 47% 162 k 75% 110 k |
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