UCS81003 Evaluation Board User’s Guide
DS50002300A-page 16
2014 Microchip Technology Inc.
J5
V
S
source selection
The jumper populated on this header selects the voltage
input source for the power switch inside the UCS81003.
1-2
V
S
source is the J1 power connector (external 5V power
supply).
2-3
V
S
is connected to V
BUS
of the J3 USB connector. Use this
configuration only if the USB host can deliver the necessary
current for charging.
J6
LATCH, S0
Logic Inputs settings
The jumpers must be left off for SMBus communication to
be enabled.
If the UCS81003 is in Stand-Alone mode (as selected by
using J18 instead of J16), then the header pins have the
following functions:
1-2
Jumper placed S0=Logic Low - Detect Power state disabled
No jumper S0=Logic High - Detect Power state enabled
3-4
Jumper placed LATCH=Logic Low - “Auto-retry” fault
handler enabled
No jumper LATCH=Logic High - “Latch” fault handler
enabled
J7
SMBus data and clock lines
If the UCS81003 is in SMBus mode (as selected by using
J16 instead of J18), then two jumpers must be populated in
1-2 and 3-4 positions to connect the clock and data lines to
the MCP2221 USB bridge.
The jumpers must be left off if UCS81003 is in Stand-alone
mode.
J8
V
BUS
output connection
This jumper connects the 5V pin of connector J10 to the
UCS81003 V
BUS
power output pins. A current probe or a
multimeter can be connected to this header for measuring
the charging current and the voltage, close to the USB
connector.
J9
PWR_EN, EM_EN, M1, M2
Logic Inputs settings
When a jumper is installed, the corresponding UCS81003
input pin will be in Logic Low state. Otherwise, the
corresponding pin will be in Logic High state.
1-2
PWR_EN
3-4
EM_EN
5-6
M1
7-8
M2
J16
Current Limit
SMBus mode
Placing one jumper on this header selects the current limit
and sets the UCS81003 in SMBus mode. In this case, no
jumper must be populated on J18 header.
J18
Current Limit
Stand-alone mode
Placing one jumper on this header selects the current limit
and sets the UCS81003 in Stand-alone mode. In this case,
no jumper must be populated on J16 header.
J17
SMBus Address
PWR_EN active low
Placing one jumper on this header selects the SMBus
address and sets the PWR_EN control to be active low. In
this case, no jumper must be populated on J19 header.
TABLE 2-3:
JUMPER DESCRIPTIONS (CONTINUED)
Designator
Function
Jumper
Position
Description
