Texas Instruments TPS65020EVM-110 manual Printed Circuit Board Assembly, Software, Setup

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Setup

1.3Printed Circuit Board Assembly

The TPS65020EVM-110 PCB contains the TPS65020 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.

1.4USB to I2C Interface Board (EV2300)

The EV2300 is the link that allows the PC and the EVM to communicate. One end of the EV2300 connects to the PC with the supplied USB cable, and the other end of the EV2300 connects to the EVM with the supplied Molex cable. 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 EV2300 receives the USB command and converts the signal to an I2C protocol. It then sends the I2C signal to the TPS65020 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 EV2300 receives the information on the I2C interface, converts it to a USB protocol, and sends it to the PC.

1.5Software

Texas Instruments has provided 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, simply go to <Start>, <Run>, and type “D:\SLVU138.exe”,and click <OK> (assuming that D: is your CD drive). The program should run without errors. If any problems occur that result in the program not being installed, view the readme.txt file on the CD for further information. Check the TPS65020 product folder on the TI website for the latest revision of the software.

2Setup

This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and use the TPS65020EVM-110.

2.1Input / Output Connector Descriptions

INPUT / OUTPUT DESCRIPTION

J1 – VIN

J2 – GND

J3 – VINLDO/GND

J4 – VSYSIN/GND

Input voltage from external power supply, recommended maximum 5.5 V. Input current is dependent on load but is typically below 2 A.

This is the return connection for VI.

Input voltage and return for LDO1 and LDO2C. Resistor R23 connects this pin to VDCDC1. If an external power supply is used, remove R23. Recommended maximum input voltage is 5.5 V

Input voltage and return for VSYSIN, one of the input voltages for RTC. Resistor R24 connects this input to VDCDC1. If an external power supply is used, remove R24. Recommended maximum input voltage is 4 V

J5 – VBACKUP/GND

J6 – GPIO1/GPIO2

J7 – VRTC/GND

J8 – Fault Outputs

J9 – USB

J10 – VDCDC1

Input voltage and return for VBACKUP, one of the input voltages for RTC. There is no on board connections to a voltage input. Recommended maximum input voltage is 4 V.

Direct connection to the GPIO1 and GPIO2 pins. For this EVM, GPIO1 is configured as a push-button input, and GPIO2 is configured as an LED output.

Output voltage from the RTC circuit.

Four fault outputs are available on this connector:

PWRFAIL - Fault occurs when input voltage is below 3 V. Pulled up to VRTC when safe, low for fail.

INT - Fault occurs when there is a fail on an input or output voltage. It acts as a sum fail. Pulled up to VI when safe, low for fail.

RESPWRON– Low reset signal controlled by SW2, 300 mS. Pulled up to VI normally.

LOWBAT– Fault occurs when input voltage is below 3.6 V. Pulled up to VI when safe, low for fail.

This header duplicates the signals from the J20 interface connector.

Output from DCDC1 switching regulator, maximum output current is 1.2 A, default voltage setting is 3.3 V.

2 TPS65020EVM-110 User's Guide SLVU138 –August 2005