Datasheet

Reset
DCH
1111
110X/
010X
Discharge
(310 ms)
SDP1
CDP
Not SDP2
DCH
Done
DCP Forced
DCP_SHORT/
DCP_DIVIDER
DCP Auto
DCP_Auto
DCH/SDP
CDP
DCH/SDP/
CDP
Note:
1)
All shaded boxes are device charging modes
2)
See below table for CTL settings corresponding to
flow line conditions
3) Mouse / keyboard wake function not shown
Initial
Not SDP1
Flow Line Condition CTL1 CTL2 CTL3 ILIM_SEL
DCH 0 0 0 X
CDP 1 1 1 1
1 1 1 0
1 1 0 X
0 1 0 X
DCP_SHORT 1 0 0 X
DCP_DIVIDER 1 0 1 X
0 1 1 X
0 0 1 X
SDP1
DCP_Auto
Device Control Pins
DCP_Auto
SDP2
SDP2
1110
1111
1110
Not CDP
TPS2543
SLVSBA6 –FEBRUARY 2012 www.ti.com
Device Operation
Please refer to the simplified device state diagram in Figure 31. 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 CTL lines as shown in Figure 31.
Figure 31. TPS2543 Charging States
Output Discharge
To allow a charging port to renegotiate current with a portable device, TPS2543 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.
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