Datasheet

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

supply here 3.5-5 volts Doubles for LI-ION Cell Input, Select

for high current testing Appropriate J1 Setting [2-3]

AN-1621 LP3972 USB Evaluation Board Rev B SNVA235A–May 2007–Revised April 2013

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