Setup
JP7 – DS2
JP7 is used to connect the cathode of the DS2 LED to the DS2 pin on the TPS60250. 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.
2.2
Equipment Requirements
In order 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 TPS60250 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 TPS60250 internal registers through the USB port.
2.2.2
Printed Circuit Board Assembly
The TPS60250EVM-185 PCB contains the TPS60250 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
2
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
2
C
protocol. It then sends the I
2
C signal to the TPS60250 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
2
C interface. The adapter receives the information on
the I
2
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 TPS60250EVM-
185 product folder (
http://www.ti.com/tool/tps60250evm-185
) on the TI Web site for the latest version of
the software.
2.2.5
Power Supplies
The TPS60250 EVM requires one power supply for operation. It may need to supply several hundred mA,
depending on the WLED currents.
2.3
Operation
The following steps must be followed before the EVM can be operated.
1. Install the TPS6025xEVM software.
2. Connect the input voltages to the EVM.
3. Configure all EVM jumpers to the factory settings in Table 1.
4. Connect the ribbon cable between the EVM and the USB-TO-GPIO (HPA172) adapter.
5. Connect the USB cable between the computer and USB-TO-GPIO adapter
6. Run the TPS6025xEVM software.
3
SLVU208B – April 2007 – Revised December 2012
TPS60250EVM-185
Copyright © 2007–2012, Texas Instruments Incorporated