Datasheet

User’s GUI for LM10500 Evaluation Board

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8.3 PWI Communication Using 9-Pin Connector J1

The LM10500 evaluation board can also interface to an AVS compatible master 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 master,

such as AVS compatible ASICs, SoCs, and processors.

The pin list of J1 is shown in the table below.

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 via 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 via USB connection. The GUI for LM10500

is shown in Figure 5. 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 Figure 4) and plug the

USB2PWI board to a PC using a USB cable. Apply PVIN and AVIN power to the LM10500 Evaluation

Board. 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 Figure 5.

AN-2080 LM10500 Evaluation Board SNVA453A–August 2011–Revised April 2013

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