UCS1003-3 datasheet(23/138 Pages) MICROCHIP

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3.0

PIN DESCRIPTION

Descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

UCS1003-1/2/3

4x4 QFN

Symbol

Function

Pin Type

Connection Type if Pin Not Used

Active Mode Selector Input #1.

Connect to ground or VDD (Note 3)

Active Mode Selector Input #2.

Connect to ground or VDD (Note 3)

3VBUS1

Voltage output from power switch. These pins are

internally connected and must be tied together.

Hi-Power

(Note 1)

Leave open

4VBUS2

COMM_SEL/ILIM

COMM_SEL (UCS1003-1 only) – Selects SMBus or

Stand-Alone mode of operation (see Table 11-1).

AIO

n/a

ILIM – Selects the hardware current limit at power-up.

SEL

Selects polarity of PWR_EN control, and in the

UCS1003-1, the SMBus address (see Table 11-2).

AIO

n/a

7VS1

Voltage input to power switch. These pins are internally

connected and must be tied together.

Hi-Power

Connect to ground

8VS2

9VDD

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 (Note 3)

SMDATA/LATCH

SMDATA

(UCS1003-1 only) – SMBus data input/output

(requires pull-up resistor).

DIOD

n/a

LATCH

– In Stand-Alone mode, latch/auto-recovery

Fault handling mechanism selection input (see

Section 7.5 “Fault Handling Mechanism”

SMCLK/S0

SMCLK

(UCS1003-1 only) – SMBus clock input

(requires pull-up resistor).

n/a

– In Stand-Alone mode, enables Attach/Removal

Detection feature (see Section 5.3.6 “S0 Input”).

Note 1:

Total leakage current from Pins 3 and 4 (VBUS) to ground must be less than 100 µA for proper Attach/Removal Detection operation.

It is recommended to use 2 M

 pull-down resistors on the DPOUT and/or DMOUT pin 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.

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 UCS1003-1 will remain in the Sleep or Detect state unless activated via the SMBus (UCS1003-2

and UCS1003-3 will remain in Sleep or Detect state indefinitely).

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