UCS81003 datasheet(19/108 Pages) MICROCHIP

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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 (see Section 7.5 “Fault Handling

Mechanism”)

SMCLK/S0

SMCLK - SMBus Clock Input (requires pull-up

resistor)

n/a

S0 - In Stand-Alone mode, enables

Attach/Removal Detection feature (see

Section 5.3.6 “S0 Input”)

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

Not internally connected

n/a

Leave open

Not internally connected

n/a

Leave open

DMOUT

USB data output (minus)

AIO (see Note 2)

Connect to ground

DPOUT

USB data output (plus)

AIO (see Note 2)

Connect to ground

A_DET#

Active low device Attach Detection output flag

(requires pull-up resistor)

Connect to ground

EM_EN

Active mode selector input

Connect to ground or VDD (see Note 3)

GND

Ground

Power

n/a

Not internally connected

n/a

Leave open

Exposed Thermal Pad. Must be connected to the

electrical ground.

n/a

TABLE 3-1:

PIN FUNCTION TABLE

UCS81003

5x5 VQFN

Symbol

Function

Pin Type

Connection Type if Pin Not Used

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.

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