UCS2112 datasheet(29/64 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005424B-page 29

UCS2112

7.2.1

OPERATION WITHIN A USB PORT

POWER PROFILE

An attached device may be constrained to operate

within the boundaries of a USB port power profile by

setting the value of ILIM less than the USB port power

profile IBUS_R2MIN value. In this case, the port power

switch will be in Trip mode up until ILIM is exceeded. At

which point, the switch will transition into CC mode. If

the attached device reduces the output voltage to less

than VBUS_MIN, the switch will trip and terminate

charging.

FIGURE 7-4:

ILIM < IBUS_R2MIN Example.

7.2.2

OPERATION OUTSIDE OF A USB

PORT POWER PROFILE

An attached device may be allowed to operate outside

of the boundaries of a USB port power profile by set-

ting the value of ILIM greater than the USB port power

profile IBUS_R2MIN value. This is the default operation

for all portable devices. In this case, the USB port

power switch will operate in Trip mode until the bus

current reaches the ILIM value. Once the ILIM value has

been exceeded, the port power switch will open and

terminate charging. Figure 7-5 illustrates an example

of current limiting in this configuration.

FIGURE 7-5:

ILIM > IBUS_R2MIN Example.

Note:

The CC mode of operation is possible only

up to 1.6A. As long as the value of ILIM is

less than the fixed port power profile

IBUS_R2MIN value, CC mode is possible.

Otherwise, the USB port power switch will

operate in trip mode operation.

0.53

1.6

2.67

3.2

5.25

4.75

Port Power Profile

Operating Region

0.96

1.28

0.96

0.53

1.6

2.13

2.67

3.2

VBUS_MIN = 2.0 V

IBUS (Amps)

ILIM (Amps)

(Trip)

ILIM = 1.6A

IBUS_R2MIN = 1.6A

0.53

1.6

2.67

3.2

5.25

4.75

Port Power Profile

Operating Region

0.96

1.28

0.96

0.53

1.6

2.13

2.67

3.2

VBUS_MIN = 2.0 V

IBUS (Amps)

ILIM (Amps)

(Trip)

ILIM = 2.67 A

IBUS_R2MIN = 1. A

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