www.ti.com
1.1.2
Printed Circuit Board Assembly
1.1.3
USB to I
2
C Adapter
1.1.4
Software
2
Setup
2.1
Input/Output Connector Descriptions
Setup
The TPS65023EVM-205 PCB contains the TPS65023 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.
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 I2C signal to the TPS65023 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 I2C interface. The adapter receives the information
on the I2C interface, converts it to a USB protocol, and sends it to the PC.
Texas Instruments provides software to assist the user in evaluating this EVM. To install the software,
insert the enclosed CD into your computer. The software should start automatically. If it does not, go to
<Start>, <Run>, and type D:\setup.exe, and click <OK> (assuming that D: is your CD drive). Check the
TPS65023 product folder on the TI Web site for the latest version of the software.
This section describes the jumpers and connectors on the EVM, as well as how to properly connect, set
up, and use the TPS65023EVM-205.
J1 – VIN
Input voltage from external power supply, recommended maximum 5.5 V. Input current depends
on load but typically is less than 2 A.
J2 – GND
This is the return connection for VIN.
J3 – VINLDO/GND
Input voltage and return for LDO1 and LDO2C. Resistor R20 connects this pin to VDCDC1. If an
external power supply is used, remove R20. Recommended maximum input voltage is 5.5 V.
J4 – VSYSIN/GND
Input voltage and return for VSYSIN, one of the input voltages for RTC. Resistor R21 can be
used to connect this input to VDCDC1. If an external power supply is used, remove R21.
Recommended maximum input voltage is 4 V.
J5 – VBACKUP/GND
Input voltage and return for VBACKUP, one of the input voltages for RTC. There are no onboard
connections to a voltage input. Recommended maximum input voltage is 4 V.
J6 – VRTC/GND
Output voltage from RTC circuit.
2
TPS65023EVM
SLVU193 – December 2006