UCS81003
Automotive USB Port Power Controller with Charger Emulation
Features:
Description:
• Port Power Switch with Two Current Limit Behaviors
- 2.9V to 5.5V source voltage range
- Up to 3.0A current (2.85A typical) with 55 m
on resistance
- Overcurrent trip or constant current limiting
- Soft turn-on circuitry
- Programmable current limit
- Dynamic thermal management
- Under and overvoltage lockout
- Back-Drive, back-voltage protection
- Latch or auto-recovery (low test current) fault
handling
The UCS81003 provides a USB port power switch for
precise control of up to 3.0A continuous current
(2.85A typical) with Overcurrent Limit (OCL), dynamic
thermal management, latch or auto-recovery (low-test
current) fault handling, selectable active-low or -high
enable, under and overvoltage lockout, back-drive
protection and back-voltage protection.
Split supply support for VS and VDD is an option for low
power in system standby states. This gives battery-
operated applications (such as on-board computers)
the ability to detect attachments from a Sleep or Off
state. After the Attach Detection is flagged, the system
can decide to wake up and/or provide charging.
- Selectable active-high or -low power switch
enable
- BC1.2 VBUS discharge port renegotiation
function
In addition to Power Switching and Current Limiting
modes, the UCS81003 will automatically charge a wide
variety of portable devices, including USB-IF BC1.2,
YD/T-1591 (2009), most Apple Inc. and RIM, and many
others. Nine preloaded charger emulation profiles
maximize the compatibility coverage of the peripheral
• Selectable/Automatic Cycling of Universal Serial
Bus (USB) Data Line Charger Emulation Profiles
- USB-IF BC1.2 Charging Downstream Port
(CDP) and Dedicated Charging Port (DCP)
modes, Chinese Telecommunications Industry
Standard YD/T 1591-2009 and most Apple®
Inc. and RIM® protocols standard; others as
defined via the SMBus 2.0/I2C™ protocol
- Supports 12W charging emulation
- USB 2.0 compliant high-speed data switch (in
data pass-through, SDP and CDP modes)
- Nine preloaded charger emulation profiles for
maximum compatibility coverage of the
peripheral devices
devices. Additionally,
emulation profile is available to accommodate unique
existing and future portable device
handshaking/signature requirements.
a
customizable charger
The UCS81003 also provides current monitoring to allow
intelligent management of system power and charge
rationing for controlled delivery of current, regardless of
the host power state. This is especially important for
battery-operated applications that want to provide power
and do not want to drain the battery excessively.
- One custom-programmable charger
emulation profile for portable device support
for fully host-controlled charger emulation
The UCS81003 is available in
28-pin VQFN package.
a 5 mm x 5 mm
• Supports Active Cables
Applications:
• Self-Contained Current Monitoring and Rationing
for Power-Allocation Applications
• DC Power Socket Replacement
• Consumer USB Port Protection
• Consumer Device Charging Port
• Auxiliary Box Charging Feature
• Low-Power Attach Detection and Open-Drain
(A_DET#) Pin
• Ultra-Low Power Sleep State
• Optional Split Supply Support for VS and VDD for
Low-Power in System Standby States
• Rear Seat Entertainment Consumer Access Point
• Wake on Attach USB
• SMBus 2.0/I2C Communications
- Supports block write and read
- Multiple SMBus addresses
• Wide Operating Temperature Range: -40°C to +85°C
• IEC61000-4-2 8/15 kV Electrostatic Discharge
(ESD) Immunity
2014 Microchip Technology Inc.
DS20005334A-page 1
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