Datasheet

Setup
4 LP8556TM-EVM User’s Guide August 2012
2. Setup
This section describes the jumpers and connectors on the EVM as well and how to properly connect, set up
and use the LP8556TM-EVM. For a quicker way to enabling the LEDs refer to the LP8556TM-EVM Quick
Start document.
2.1. Input / Output Connector Description
VIN_B – Input is the power input terminal for the boost converter. The terminal provides a power (Vbat)
connection to allow the user to attach the EVM to a power supply via a cable assembly with banana plugs.
VIN – Input is the alternative power input terminal for the boost converter. The terminal provides a power
(Vbat) connection to allow the user to attach the EVM to a power supply via a cable assembly with SMA
connectors.
EN/VDDIO – Input is the power input terminal for the LED driver I/O circuitry. The terminal provides a power
(VDDIO) connection to allow the user to attach the EVM to a power supply via a cable assembly with banana
plugs.
GND – Input is the power input terminal for the boost converter. The terminal provides a common ground
(GND) connection to allow the user to attach the EVM to a power supply via a cable assembly with banana
plugs.
P1 – VIN Input is another alternative power input terminal or a test point for the boost converter input.
P2 – Jumper is a place for connecting the VDD pin directly to the boost input (VIN).
P3 – VDD Input is a power input terminal for the internal LDO of the LED driver.
P4 – EN/VDDIO Input is another alternative power input terminal or a test point for the LED driver I/O
circuitry.
P5 – PWM Input is a signal input terminal for the external PWM signal.
P6 – I2C Pullup Selection Jumper is a place for selecting a pull-up reference for the I2C bus. V-USB is a
3.3V reference provided by the USB-I2C Interface Board
F1, F2 – Connectors for interfacing to the USB-I2C Interface Board.
FP1 – Connector for interfacing to the LED Board.
Dx Jumpers – Jumpers for bypassing LED current sense resistors.
TP1 – VBOOST Output test point.
TP2 – VLDO Output test point.
TP3 – Current sinks’ headroom voltages test points.
TP4 – VIN Input test point.
TP5 – Switch node test point.
TP6 – EN / VDDIO test point.
TP7 – VIN input test point.