UCS2113-2-VSLASHG4 datasheet(21/62 Pages) MICROCHIP

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DS20005680B-page 21

UCS2113

5.4

Discrete Output Pins

5.4.1

ALERT#1 AND ALERT#2 OUTPUT

PINS

The UCS2113 has two independent ALERT# out pins.

ALERT#1 is tied to the status of the VBUS1 pin.

ALERT#2 is tied to the status of the VBUS2 pin.

The ALERT# pin is an active-low open-drain interrupt

to the host controller. The ALERT# pin is asserted

when an error occurs. Also, when charge rationing is

enabled, the ALERT# pin is asserted by default when

the current rationing threshold is reached (as

determined by RATION_BEH<1:0>). The ALERT# pin

is released when all error conditions that may assert

the ALERT# pin (such as an error condition and charge

rationing) have been removed or reset as necessary.

The UCS2113 is compatible with the Microchip hub

devices supporting single pin power control feature.

These hub devices have a single connection to the

PWR_EN and ALERT# pins of the UCS2113, which are

tied together in the application.

5.4.2

BOOST# OUTPUT PIN

The UCS2113 provides a BOOST# output pin to

compensate for voltage drops during high loads. The

BOOST# pin is an active-low, open-drain output that

would be connected to a resistor in the DC-DC

converter’s

feedback

error

voltage

loop

(see

Figure 5-3).

The

BOOST#

asserted

when

VBUS Current > IBOOST. IBOOST typical value is 1.9A.

The BOOST# is OR’ed for both VBUS1 and VBUS2 ports.

When the BOOST# pin is asserted, it will remain in this

state for at least tBOOST_MAT (minimum assertion time).

FIGURE 5-3:

Boost# Pin Usage.

5.5

Discrete Input Pins

5.5.1

COMM_ILIM INPUT

The

COMM_ILIM

input

determines

the

communications mode, as shown in Table 6-1. This is

also the hardware strap for MAX Current Limit.

5.5.2

SMCLK

When operated in Stand-Alone mode, this pin should be

tied to ground. When the UCS2113 is configured for

SMBus communications, the SMCLK is the clock input.

5.5.3

SMDATA

When used in Stand-Alone, this pin should be tied to

ground.

When the UCS2113 is configured for SMBus

communications, the SMDATA is the data input/output.

DC-DC

Converter Block

5.0VOUT

FeedBack

GND

VFB

GND

PWR_EN1

BOOST#

PWR_EN2

GND

VBUS1

COMM_ILIM

GND FLAG

UCS2113

20-QFN 4 x 4 mm

VBUS1

VBUS2

5VOUT

R1 R2 R3

 V



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

VOUT



R2 R3

 R

1 VFB



R3 R4



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

VOUT



5VOUT

VFB

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

------

–





 R1 VFB



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



If R1 R3



VOUT



5VOUT R1



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



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