UCS1002-3 datasheet(17/114 Pages) MICROCHIP

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DS20006852A-page 17

UCS1002-3

3.0

PIN DESCRIPTION

The function of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

UCS1002-3

5x5 VQFN

Symbol

Function

Pin Type

Connection Type if Pin

Not Used

Active mode selector input #1

Connect to ground or

VDD (see Note 3)

Active mode selector input #2

Connect to ground or

VDD (see Note 3)

VBUS1

Voltage output from Power Switch

These pins are internally connected

and must be tied together.

Hi-Power, AIO,

Note 1

Leave open

VBUS2

COMM_SEL/ILIM COMM_SEL – selects SMBus or

Stand-Alone mode of operation

AIO

n/a

ILIM – selects the hardware current

limit at power-up

SEL

Selects polarity of PWR_EN control

and SMBus address

AIO

n/a

VS1

Voltage input to Power Switch. These

pins are internally connected and

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 is determined by SEL pin.

Connect to ground or

VDD (see Note 3)

SMDATA/

LATCH

SMDATA - SMBus data input/output

(requires pull-up resistor)

DIOD

n/a

LATCH - In Stand-Alone mode,

Latch/Auto-Recovery Fault Handling

mechanism selection input

SMCLK/S0

SMCLK - SMBus Clock Input

(requires pull-up resistor)

n/a

S0 - In Stand-Alone mode, enables

Attach/Removal Detection feature

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 (see

Note 2)

Connect to ground

Note 1: Total leakage current from pins 4, 5 and 6 (VBUS) to ground must be less than 100 µA for proper

attach/removal detection operation.

2: It is recommended to use 2 M

 pull-down resistors on the DPOUT or DMOUT pin, or both if a portable

device stimulus is expected when using the Customer Charger Emulation profile with the high-speed data

switch open. The 2 M

 value is based on BC1.1 impedance characteristics for Dedicated Charging Ports.

3: 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 pin is disabled or all of the M1, M2,

and EM_EN pins are connected to ground, the UCS1002-3 remains in the Sleep or Detect state unless

activated via the SMBus.

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