UCS1001 datasheet(12/59 Pages) MICROCHIP

12 / 59 page

USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.2 (05-21-12)

SMSC UCS1001

DATASHEET

Note 2.1

Total leakage current from pins 3 and 4 (VBUS) to ground must be less than 100 µA for

proper attach / removal detection operation.

Note 2.2

To ensure operation, the PWR_EN pin must be enabled, as determined by the SEL pin

decode, when it is not driven by an external device. Furthermore, one of the M1, M2, or

EM_EN pins must be connected to VDD if all three are not driven from an external device.

If the PWR_EN is disabled or all of the M1, M2, and EM_EN are connected to ground, the

UCS1001 will remain in the Sleep or Detect state indefinitely.

VS1

Voltage input to Power Switch.

These pins must be tied together.

Hi-Power,

AIO

Connect to ground

VS2

VDD

Main power supply input for chip

functionality

Power

n/a

PWR_EN

Port power switch enable input. Polarity

determined by SEL pin.

Connect to ground

or VDD (see

Note 2.2)

LATCH

Latch / Auto-recovery fault handling

mechanism selection input (see

Section 6.5, "Fault Handling

Mechanism")

n/a

Enables Attach / Removal Detection

feature (see Section 4.3.6, "S0 Input")

n/a

ALERT#

Active low error event output flag

(requires pull-up resistor)

Connect to ground

DPIN

USB data input (plus)

AIO

Connect to ground

or ground through

a resistor

DMIN

USB data input (minus)

AIO

Connect to ground

or ground through

a resistor

DMOUT

USB data output (minus)

AIO

Connect to ground

DPOUT

USB data output (plus)

AIO

Connect to ground

(UCS1001-1)

CHRG#

Active low “Charging Active” output flag

(requires pull-up resistor)

Connect to ground

(UCS1001-2)

A_DET#

Active low Attach Detection output flag

(requires pull-up resistor)

Connect to ground

EM_EN

Active mode selector input

Connect to ground

or VDD (see

Note 2.2)

GND

Ground

Power

n/a

Bottom Pad

GND FLAG

Thermal connection to ground plane

Thermal Pad

n/a

Table 2.1 UCS1001 Pin Description (continued)

NUMBER

PIN NAME

PIN FUNCTION

PIN TYPE

IF PIN NOT USED

CONNECTION

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