Microchip Technology UCS1003-1, Руководство пользователя

Страница: 23 / 53

UCS1003-1
EVALUATION BOARD
USER’S GUIDE

2016 Microchip Technology Inc. DS50002510A-page 23
Chapter 3. Hardware Description
3.1 UCS1003-1 DEVICE
The UCS1003-1 provides a single USB port power switch for precise control of up to
3.0A continuous current (2.85A typical) with overcurrent limiting, dynamic thermal
management, latch/auto-recovery upon fault, selectable active low or high enable,
under and overvoltage lockout, and back-drive protection.
USB Charging Port profiles are integrated into the UCS1003-1 to ensure compliance
to multiple standards. In addition to power switching and USB Charging Port profiling,
the UCS1003-1 provides automatic and configurable USB data line handshaking to
enable charging of USB-IF Battery Charging 1.2 (CDP or DCP modes), Chinese
Telecommunications Industry Standard YD/T 1591-2009, Apple
®
Inc., RIM
®
and many
other mobile devices.
The UCS1003-1 provides a device attachment detection output, as well as a dedicated
alert output, with current monitoring and charge rationing for controlled delivery of
current regardless of a host’s power state. When the limit is reached, the UCS1003-1
will perform the user-programmed behavior (report and disconnect is the default).
3.2 EVALUATION BOARD POWER SOURCE
The UCS1003-1 has split power supply support:
• V
S
is the voltage input to Power Switch. This supply rail is required to charge the
portable device. V
S
source is selected by populating a jumper on J5 header, as
follows:
• V
DD
is the power supply for chip functionality. The UCS1003-1 Evaluation Board
contains two additional ICs, MCP2221 USB bridge and MCP23018 I/O expander,
which are also powered from the V
DD
supply rail. V
DD
source is selected by
populating a jumper on the J4 header, as follows:
Jumper
Position
Definition
1-2 V
S
is supplied from the external 5V power supply connected to J1 power jack.
2-3 V
S
is supplied from the V
BUS
pin of the J3 USB connector. Use this option
only if the USB host port can supply the charging current for the portable
device.
Jumper
Position
Definition
1-2 V
DD
is supplied from V
BUS
pin of the J2 USB connector. When using the
board in this configuration and the Attach Detection feature of the UCS1003-1
is used, the V
S
voltage must not exceed V
DD
+ 150 mV, as specified in the
data sheet.
2-3 V
DD
is connected to V
S
. This configuration is recommended when using the
Attach Detection feature. If the board is evaluated with a PC running the GUI,
then the V
S
must be supplied after the USB cable is plugged into the J2
connector.