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Setup

JP6 – DS1

JP6 is used to connect the cathode of the DS1 LED to the DS1 pin on the TPS60251. Place a shunt on

JP6 to connect the WLED to the DS1 input. Remove the shunt to measure the DS1 current or use an

external WLED for DS1.

JP7 – DS2

JP7 is used to connect the cathode of the DS2 LED to the DS2 pin on the TPS60251. Place a shunt on

JP7 to connect the WLED to the DS2 input. Remove the shunt to measure the DS2 current or use an

external WLED for DS2.

JP8 – EN

JP8 is used as the hardware enable for the TPS60251. Place a shunt in the ON position to turn the

TPS60251 on. Place a shunt in the OFF position to turn TPS60251 off. All internal register values are

defaulted to 0x00 when JP8 is placed in the OFF position.

2.2 Equipment Requirements

For this EVM to operate properly, the following components must be connected and properly configured.

2.2.1 Personal Computer

A computer with a USB port is required to operate this EVM. The TPS60251 interface software, which is

run on the personal computer (PC), communicates with the EVM via the PC USB port. The user sends

commands to the EVM and reads the contents of the TPS60251 internal registers through the USB port.

2.2.2 Printed Circuit Board Assembly

The TPS60251EVM-192 PCB contains the TPS60251 IC and its required external components. This

board contains several jumpers and connectors that allow the user to customize the board for specific

operating conditions.

2.2.3 USB to I

C Adapter

The HPA172 is the link that allows the PC and the EVM to communicate. The adapter connects to the PC

with the supplied USB cable on one side and to the EVM though the supplied ribbon cable on the other.

When the user writes a command to the EVM, the interface program, which is run from the PC, sends the

command to the PC USB port. The adapter receives the USB command and converts the signal to an I

protocol. It then sends the I

C signal to the TPS60251 board. When the user reads a status register from

the EVM, the PC sends a command to read a register on the EVM. When the EVM receives the

command, it reports the status of the register via the I

C interface. The adapter receives the information on

the I

C interface, converts it to a USB protocol, and sends it to the PC.

2.2.4 Software

Texas Instruments provides software to assist the user in evaluating this EVM. Check the TPS60251EVM-

192 product folder (http://www.ti.com/tool/tps60251evm-192) on the TI Web site for the latest version of

the software.

2.2.5 Power Supplies

The TPS60251 EVM requires two power supplies for operation. The power supply connected to VIN may

need to supply several hundred mA, depending on the WLED currents. The power supply connected to

VIO only needs to supply the current required to operate the I

C bus.

2.3 Operation

The following steps must be followed before the EVM can be operated.

1. Install the TPS6025xEVM software.

2. Configure all EVM jumpers to the factory settings in Table 1.

SLVU209B–April 2007–Revised December 2012 TPS60251EVM-192

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