Powering and Jumpers Selection
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8
Powering and Jumpers Selection
The LP3972 USB evaluation platform offers several power connectors. These connectors are outlined on
the table below. In addition, the Evaluation board has jumpers for special modes and stand-alone use.
The default jumper settings are valid in normal operation and are also outlined below.
Component
Use
Comment
J5-1
Output for LDO1
Outside Pin of Connector is Grd
J5-2
Output for LDO2
Outside Pin of Connector is Grd
J5-3
Output for LDO3
Outside Pin of Connector is Grd
J5-4
Output for LDO4
Outside Pin of Connector is Grd
J5-6
Output for LDO5
Use LED Pad [Missed Pin]
J5-5
Output for RTC [Real time Clock]
Outside Pin of Connector is Grd
J4-1
Input for external wakeup
Outside Pin of Connector is Grd
J4-2
Output for nBATT Fault
Outside Pin of Connector is Grd
J6-2
Output for nREST
Outside Pin of Connector is Grd
J6-3
GPO 1 output
Outside Pin of Connector is Grd
J6-4
GPO 2 output
Outside Pin of Connector is Grd
J3-1
Cop8 microwire SO
Used for Micro Flash Only
J3-2
Cop8 microwire SK
Used for Micro Flash Only
J3-3
Cop8 microwire SI
Used for Micro Flash Only
J3-4
Cop 8 Grd
Used for Micro Flash Only
TP14-15
Output for Buck switcher 1
GRD is TP12-13
TP19-20
Output for Buck switcher 2
GRD is TP21-22
TP5-6
Output for Buck switcher 3
GRD is 7-8
USB
USB connector
Connect to PC via Supplied Cable
J1
Power usage selection
Place Jumper for USB, NO JUMPER for
External Power Input
TP1-2
Connect external V
CC
supply here 3.5-5 volts
Doubles for LI-ION Cell Input, Select
for high current testing
Appropriate J1 Setting [2-3]
6
AN-1621 LP3972 USB Evaluation Board Rev B
SNVA235A – May 2007 – Revised April 2013
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