The USB2PWI board is powered by the USB port. It generates a 3.6-V V
BAT
. V
BAT
is used on the evaluation
board to provide the on board 2.5 V, which can be used to power VPWI. V
BAT
can also be connected to PVIN
to power the LM10500 when no other power supply is available, but the loading capability is limited on V
BAT
. If
available, PVIN should be powered by a bench supply with sufficient voltage and current ranges.
8.3 PWI Communication Using 9-Pin Connector J1
The LM10500 evaluation board can also interface to an AVS-compatible primary controller using J1. All signals
related to the PWI signaling environment are available on this 1x9 header on the edge of the board. Although
primarily intended for signal inspection, this header also allows external control of the PWI communication.
This connector allows the LM10500 to be tested in a closed AVS loop with a primary controller, such as AVS
compatible ASICs, SoCs, and processors.
The pin list of J1 is shown in the following table.
Pin
Label
Type
Description
1
GND
GND
Ground
2
VBAT
Power
VBAT or sense
3
PWROK
Output
PWROK
4
RESETN
Input
1: Active
0: Reset
5
ENABLE
Input
1: Enabled
0: Disabled
6
SPWI
Input/Output
PWI data
7
SCLK
Input
PWI clock
8
VPWI
Power
VPWI-EXT or sense
9
GND
GND
Ground
The pins are spaced at 100-mil intervals. They can also be used as a sensing pin to determine the drive level
for the PWI interface pins: SCLK, SPWI, PWROK, ENABLE, and RESETN. VBAT and VPWI should be used as
the control voltage input when the USB2PWI board is not connected. SPWI and SCLK are PWI communication
data pin and clock pin, respectively. ENABLE is connected to the EN pin of the device. It is pulled up to AVIN
through a 10-kΩ resistor on the board. This pin also can be used to enable/disable the device externally. If driven
externally, a voltage typically greater than 1.2 V will enable the device. VPWI is for powering VPWI pin externally
or monitoring the VPWI pin. VPWI range is from (1.8 V– 10%) to (3.3 V + 10%).
9 User’s GUI for LM10500 Evaluation Board
A user’s GUI is provided to control LM10500 evaluation boards through USB connection. The GUI for LM10500
is shown in
. It is compatible with both PWI1.0 and PWI2.0. The GUI supports PWI1.0 and PWI2.0
address 0. The LM10500 device supports PWI1.0 and PWI2.0 address 0, 1, 2, and 3. The GUI can read and
write LM10500 registers to control and monitor the output voltage and operation mode. The GUI can also
enable, reset the LM10500, and control the operation states, such as sleep, wake up, shutdown and reset, by
generating PWI commands. All AVS functions of the LM10500 can be tested easily through the GUI.
9.1 Quick Start Guide
1. Connect the LM10500 evaluation board to the USB2PWI interface board (as in
) and plug the
USB2PWI board to a PC using a USB cable. Apply PVIN and AVIN power to the LM10500 evaluation board.
The part is enabled by default. Press the reset button on the SUB2PWI board. The reset button is the blue
button located right next to the USB connector.
2. Run the GUI by double clicking ‘Evaluation.exe’, with ‘Evaluation.ini’ and ‘usblptio.dll’ in the same folder,
from the PC. The default state of the GUI is shown in
.
Operation Guide
SNVA453B – AUGUST 2011 – REVISED JANUARY 2022
LM10500 Step-Down Converter Evaluation Module User's Guide
7
Copyright © 2022 Texas Instruments Incorporated
