Figure 9-1. User's GUI For The LM10500 Evaluation Board
3. (Optional) Check authentication by clicking the ‘Authenticate’ button on the bottom right of the GUI. Then
click ‘R’ on the right of the ‘Auth_OK’ button to read back the authentication result. If ‘PWROK’ and
“Auth_OK’ are both ‘1’ (in their depressed positions), then authentication is succeeded and the GUI is ready
to control the LM10500 evaluation board.
4. CTRL + R, or from the menu 'Operations', select 'Read all', the default register values will be read from the
LM10500 and shown in the GUI, as in
. If the default register setting does not show, press reset
button on the USB2PWI board and repeat this step.
Figure 9-2. The LM10500 GUI With Default Register Values And Status (LM10500SQ-0.8)
Note
Note that picture shows the default values for LM10500SQ-0.8 with PWI1.0. For LM10500SQ-1.0, R9
is 0H. For PWI2.0 protocol, R4 is 02H.
9.2 GUI Layout and Conventions
Buttons in their depressed position mean that the corresponding bits are equal to 1, logic high, and in the raised
position show the corresponding bits are equal to 0, logic low. '-0-' on a button means the bit is not used.
Reading from unused bits returns '0' and writing to unused bits are ignored.
The top four lines of the GUI are the PWI registers of the LM10500. R0 controls the core voltage, ranging from
00h to 7Fh. R4 shows the PWI version: 01h means PWI1.0 and 02h means PWI2.0. R9 is the core voltage
offset and the default value differs in LM10500SQ-0.8 and LM10500SQ-1.0. The default value of R9 is 00h in
LM10500SQ-1.0 and 40h in LM10500SQ-0.8. The actual core voltage code is determined by the resulting code
of (R0-R9) if (R0-R9) is above zero, otherwise, the core voltage code is zero. R10 enables and disables FPWM
and stepping controls. Please refer to the
LM10500 5A Step-Down Energy Management Unit w/PowerWise
data sheet for more details.
The ‘ENABLE’ button controls the hardware enable if it is connected to LM10500.
The PWROK and Auth_OK are read-only bits, indicating the LM10500 has proper output voltage and successful
authentication, respectively.
The PWI commands buttons send out commands to alter the operating state of the PWI secondary: the
LM10500, authenticate and synchronize. Please refer to PowerWise interface specification for the details of
PWI standard at pwistandard.com.
User’s GUI for LM10500 Evaluation Board
8
LM10500 Step-Down Converter Evaluation Module User's Guide
SNVA453B – AUGUST 2011 – REVISED JANUARY 2022
Copyright © 2022 Texas Instruments Incorporated
