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2015-08-0012

PT0513-3

8/31/15

22

PI5USB2544A, PI5USB2546A

USB Charging Port Controller and Load Detection Power Switch

Figure 6, PI5USB2546A Power Wake flow chart

Load being Charged

 PI5USB2546A is asserting power wake

 System power is at its full capability

 Load can charge at high current

 PI5USB2546A monitors port to detect when

charging load is done charging or removed

Charging Load Detected



PI5USB2546A is asserting power wake



System power turns on to its full power State



Load Vbus is held low for 2s to give the power

system time to turn on before the load tries to

pull charging current again.

Charging Load Not Detected



PI5USB2546A is not asserting power wake



System power is in a low power state to save energy.



PI5USB2546A monitors port to detect when charging load

is attached and tries to charge

Case 1 Load Detected

--------------------------------------

Power Wake Asserted

/STATUS=0

Current Limit=ILMI_HI setting

OUT Discharge

---------------------------------------

OUT Discharge Power Wake Asserted

/STATUS=0

Current Limit=55mA

Case 2A&2B (No Load Detected)

---------------------------------------------------

Power Wake D-asserted

/STATUS=1

Current Limit=55mA

Load Current<45mA for

15s (Not Charging)

Load Current>55mA

(Charging Current Detected)

Discharge >2s