UCS81003 datasheet(26/108 Pages) MICROCHIP

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UCS81003

DS20005334A-page 26

 2014 Microchip Technology Inc.

Figure 5-4 shows a system configuration in which the

UCS81003 provides a port power switch, low-power

Attach Detection, charger emulation (with no USB host)

and portable device attachment detected signaling.

This configuration is useful for wall adapter-type

applications and cigarette-plug adapters.

FIGURE 5-4:

UCS81003 System Configuration (No SMBus, No USB Host, with Charger

Emulation).

5.1

UCS81003 Power States

The UCS81003 has the following power states:

UCS81003

LATCH

ALERT#

PWR_EN

–5.5V

GND

Device

DPIN

DMIN

DPOUT

DMOUT

VDD

VBUS1

VBUS2

VS1

VS2

COMM_SEL/ILIM

–5.5V

Auto-recovery

Upon Fault

Latch

Upon Fault

EM_EN

SEL

A_DET#

CBUS

Disable

Detect State

Enable

Detect State

CIN

VBUS3

VS3

TABLE 5-1:

POWER STATES DESCRIPTION

State

Description

Off

This power state is entered when the voltage at the VDD pin voltage is < VDD_TH. In this state, the device

is considered “off”. The UCS81003 will not retain its digital states and register contents, nor respond to

SMBus/I2C communications. The port power switch, bypass switch and the high-speed data switches will

be off. See Section 5.1.1 “Off State Operation”.

Sleep

This is the lowest power state available. While in this state, the UCS81003 will retain digital functionality,

respond to changes in emulation controls and wake to respond to SMBus/I2C communications. The high-

speed switch and all other functionality will be disabled. See Section 5.1.2 “Sleep State Operation”.

Detect

This is a low-current power state. In this state, the device is actively looking for a portable device to be

attached. The high-speed switch is disabled by default. While in this state, the UCS81003 will retain the

configuration and charge rationing data, but it will not monitor the bus current. SMBus/I2C

communications will be fully functional. See Section 5.1.3 “Detect State Operation”.

Error

This power state is entered when a fault condition exists. See Section 5.1.5 “Error State Operation”.

Active

This power state provides full functionality. While in this state, operations include activation of the port

power switch, USB data line handshaking/charger emulation and current limiting and charge rationing.

See Section 5.1.4 “Active State Operation”.

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