PI5USB2544A Datasheet, PDF (16/31 Pages) Pericom Semiconductor Corporation – USB Charging Port Controller and Load Detection Power Switch

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Device Operation
PI5USB2544A, PI5USB2546A
USB Charging Port Controller and Load Detection Power Switch
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Please refer to the simplified device state diagram below. Power-on-reset (POR) holds device in initial state while output is held
in discharge mode. Any POR event will take the device back to initial state. After POR clears, device goes to the next state
depending on the CTL1, CTL2, CTL3 and ILIM_SEL lines as shown Figure 5.
Reset
CDP
(1111)
Sample
CTL
PinsDisc
DCH
DCH
Done
SDP2
(1110)
SDP1
(111x/
010x)
Discharge
Not SDP1
SDP1
DCP_Auto
DCP_Short
Divider-1A
DCH/SDP/CDP
DCP Forced (DCP
Shorted or Divider-
1A)
DCP_Auto
DCH/SDP/CDP
DCP_Shorted/
Divider-1A
Not SDP2
or CDP
DCP Auto (DCP Shorted
/DCP-1.2V
/ Divider-1A/2A/2.4A)
CDP
CDP
(1111)
SDP2
(1110)
SDP2
Note:
1) All shaded boxed are device charging modes.
2) See below table for CTL settings corresponding to flow
line conditions
Device Control Pins
Flow Line Condition CTL1 CTL2CTL3ILIM_SEL
DCH(Discharge)
0 00
x
CDP
1 11
1
SDP2(No Discharge
from/to CDP)
1 11
0
SDP1(Discharge
1 10
x
from/to any charging
state including CDP)
0 10
x
DCP_Short
1 00
x
DCP/Divider-1A
1 01
x
DCP_Auto
0 11
x
0 01
x
Figure 5, PI5USB2544A/2546A Charging States
Output Discharge
To allow a charging port to renegotiate current with a portable device, PI5USB2544A/2546A uses the OUT discharge function.
It proceeds by turning off the power switch while discharging OUT, then turning back on the power switch to reassert the OUT
voltage. This discharge function is automatically applied as shown in device state diagram.
2015-08-0012
PT0513-3 8/31/15
16