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The USB2PWI board is powered by the USB port. It generates a 3.6-V V
board to provide the on board 2.5 V, which can be used to power VPWI. V
to power the LM10500 when no other power supply is available, but the loading capability is limited on V
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
1
2
3
4
5
6
7
8
9
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
Figure
9-1. 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
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
SNVA453B – AUGUST 2011 – REVISED JANUARY 2022
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Label
GND
VBAT
PWROK
RESETN
ENABLE
SPWI
SCLK
VPWI
GND
Figure
LM10500 Step-Down Converter Evaluation Module User's Guide
Copyright © 2022 Texas Instruments Incorporated
. V
is used on the evaluation
BAT
BAT
can also be connected to PVIN
BAT
Type
GND
Power
Output
Input
Input
Input/Output
Input
Power
GND
Figure
8-1) and plug the
9-1.
Operation Guide
. If
BAT
Description
Ground
VBAT or sense
PWROK
1: Active
0: Reset
1: Enabled
0: Disabled
PWI data
PWI clock
VPWI-EXT or sense
Ground
7
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