UCS81003 datasheet(18/108 Pages) MICROCHIP

18 / 108 page

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLE

UCS81003

5x5 VQFN

Symbol

Function

Pin Type

Connection Type if Pin Not Used

Not internally connected

n/a

Leave open

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)

4VBUS1

Voltage output from Power Switch.

These pins are internally connected and must be

tied together.

Hi-Power

Note 1

Leave open

5VBUS2

6VBUS3

COMM_SEL/ILIM

COMM_SEL - 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 SMBus

address (see Table 11-2).

AIO

n/a

9VS1

Voltage input to Power Switch. These pins are

internally connected and must be tied together.

Hi-Power

Connect to ground

VS2

VS3

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 3)

Not internally connected

n/a

Leave open

Not internally connected

n/a

Leave open

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.

It is recommended to use 2 M

 pull-down resistors on the D

POUT 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 UCS81003 will remain in the Sleep or Detect state unless activated via the SMBus.

UCS81003 Datasheet(PDF) 18 Page - Microchip Technology

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