User Guide
MP8869S Evaluation Kit (EVKT-8869S)
USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Table of Contents
Overview ................................................................................................................................................ 3
Section 1. Hardware Specifications ........................................................................................................ 5
1.1 Personal Computer Requirements .............................................................................................. 5
1.2 EV8869S-L-00A Specifications ................................................................................................... 5
1.3 EVKT-USBI2C-02 Specifications ................................................................................................ 5
Section 2. Software Requirements ......................................................................................................... 6
2.1 Software Installation Procedure .................................................................................................. 6
Section 3. Evaluation Kit Test Set-Up ..................................................................................................... 7
3.1 Hardware Set-Up ........................................................................................................................ 7
3.2 Powering Up the EVB ................................................................................................................. 7
3.3 Software Set-Up ......................................................................................................................... 7
3.4 Troubleshooting Tips ............................................................................................................... 10
Section 4. Ordering Information............................................................................................................ 11
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Overview
Introduction
The EVKT-8869S is an evaluation kit for the MP8869S. The MP8869S is a highly integrated, highfrequency, synchronous, step-down switcher with an I2C control interface. The MP8869S is optimized
to support up to 12A continuous/15A peak output current over an input supply range from 2.85V to 18V
with excellent load and line regulation. This kit allows for quick evaluation of the MP8869S. By using the
I2C, users can set the current limit, slew rate, work mode, and output voltage. This device also features
telemetry, which provides output voltage and output current monitoring via the I2C.
Kit Contents
EVKT-8869S kit contents (items below can be ordered separately):
#
Part Number
Item
Quantity
1
EV8869S-L-00A
MP8869SGL evaluation board
1
2
EVKT-USBI2C-02
Includes one USB to I2C communication interface, one USB
cable, and one ribbon cable
1
Ribbon Cable
Figure 1: EVKT-8869S Evaluation Kit Set-Up
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Features and Benefits
The MP8869S is highly customizable. Users can program the MP8869S via the MPS I2C GUI.
⚠️ All changes made in I2C mode will NOT be retained once the EVB is powered down.
Adjustable features:
I2C
•
•
•
•
•
•
•
•
•
•
•
Adjustable output voltage
Slew rate
Selectable OVP, OCP mode
Selectable PFM mode
Selectable PG deglitch time
Selectable frequency
Soft stop
Adjustable current limit
Output current/voltage monitor
System enable (EN bit)
Status indication: OC, OTEW, OT, PG
•
Kit Specifications
Features
Supply for Board
Operating Input Voltage
Output Voltage (VOUT)
Continuous Output Current (I OUT)
Peak Output Current (IOUT)
Operating Systems Supported
System Requirements
GUI Software
EVB Size (LxW)
Specification
2.85V to 18V
2.85V to 18V
1V
12A
15A
Windows XP, 7, or later
Minimum 22.2MB free
3 register controls: VSEL, System1, System2
8.5cmx8.5cm
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Section 1. Hardware Specifications
1.1 Personal Computer Requirements
The following must be met to use the EVKT-8869S:
•
Operating System of Windows XP, 7, or later
•
Net Framework 4.0
•
PC with a minimum of one available USB port
•
At least 22.2MB of free space
1.2 EV8869S-L-00A Specifications
The EV8869S-L-00A is an evaluation board for the MP8869SGL. For more information, refer to the
EV8869S-L-00A datasheet.
Feature
Specification
Supply for Evaluation Board
2.85V to 18V
Operating Input Voltage
2.85V to 18V
Output Voltage (VOUT)
1V
Continuous Output Current (IOUT)
12A
Peak Output Current (IOUT)
15A
EVB Size (LxW)
8.5cmx8.5cm
Figure 2: EV8869S-L-00A Evaluation Board
1.3 EVKT-USBI2C-02 Specifications
The EVKT-USBI2C-02 communication interface connects the EVB, the PC, and its supporting
accessories. It provides I2C and PMBus capabilities. Together with the MPS Virtual Bench Pro and GUI
tools, it provides a quick and easy way to evaluate the performance of MPS digital products. For more
details, refer to the EVKT-USBI2C-02 datasheet.
Figure 3: EVKT-USBI2C-02 Communication Interface
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Section 2. Software Requirements
2.1 Software Installation Procedure
Programming occurs through the MPS I2C GUI. Follow the instructions below to download and install
the software:
Note: This software can be downloaded directly from the MPS website.
1. Visit the MP88xx I2C GUI page at https://www.monolithicpower.com/en/i2c-tool.html.
2. Click the “Download” button in the upper right-hand corner.
3. Once the download has completed, double-click the .exe file to open the set-up guide (see Figure 4).
If a protection window comes up, click “More info,” then click “Run anyway.”
4. Follow the prompts in the set-up guide.
5. Wait for the status screen to verify that installation is complete (see Figure 5).
2
Figure 4: MPS I C GUI Set-Up Guide
2
Figure 5: MPS I C GUI Set-Up Success
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Section 3. Evaluation Kit Test Set-Up
3.1 Hardware Set-Up
The hardware must be configured properly prior to use. Use the USB cable to connect the EVKTUSBI2C-02 communication interface to the PC, and follow the instructions below to set up the EVB:
1. Locate the proper wires to connect the EVB to the EVKT-USBI2C-02 communication interface.
2. Connect SCL, SDA, and GND (see Figure 6). If needed, refer to the datasheet for further clarification.
2
Figure 6: EVB to MPS I C Communication Interface Wire Connection
3.2 Powering Up the EVB
1. Connect the positive and negative terminals of the load to the VOUT and GND pins, respectively.
2. Preset the power supply output between 4.5V and 21V, then turn off the power supply.
3. Connect the positive and negative terminals of the power supply output to the VIN and GND pins,
respectively.
4. Turn the power supply on. The MP8869S will enter the power-on sequence automatically.
3.3 Software Set-Up
After connecting the hardware according to the above steps, follow the steps below to use the GUI
software:
1. Start the software. It will automatically check the EVB connection.
•
If the connection is successful, the address will be listed in the “Slave Address” (see Figure 7).
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Figure 7: Appearance of Address Indicates Successful Connection
•
If not, a warning will appear at the bottom. There are two warnings users can expect (see Figure
8). Each warning means there is an invalid connection.
1) “EVB is Disconnected” means that the evaluation board is not connected.
2) “Communication Board is Disconnected” means that the USB I2C communication interface
is not connected.
Invalid Slave Address
Communication
Board is
Disconnected
EVB is Disconnected
Figure 8: Warning Indicates Unsuccessful Connection
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
2. If the connection is successful, proceed to Step 3. Otherwise, check the connections between the
EVB, communication interface, and PC. Re-plug the USB into the computer and restart the GUI.
3. Click the “ Part Select” button to select the MP8869S (see Figure 7). The default GUI window is
for the MP8861. The Register Control menu will appear on the left side. I2C register values will
be read and displayed on the right side after clicking the “Read” button (see Figure 9).
Figure 9: Values from I2C Shown in Table
4. Find the item you want to change, and select the desired value from the drop-down menu.
5. Click the “Read All” button to update values. The changed information of the item will appear on
the right side (see Figure 10).
Figure 10: Refer to Datasheet to Translate 0s and 1s
⚠️ All changes made via the I2C will be restored to default values once the EVB is powered down.
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
3.4 Troubleshooting Tips
Note: USBI2C-02 and USBI2C-01 drivers are not compatible. USBI2C-02 uses USBXpress and USBI2C01 uses Cyusb3. USBI2C-02 is the recommended device for MPS PMBus and I2C.
EVKT-USBI2C-01
If the USBI2C-01 driver is not properly installed, manual
installation is required. Follow the steps below:
1. Open the Device Manager and select “Update Driver
Software” (see Figure 11).
2. Click “Browse My Computer for Driver Software,” find
the downloaded driver, and install.
EVKT-USBI2C-02
If the USBI2C-02 driver is not properly installed, manual
installation is required. Follow the steps below:
Figure 11: Updating the Driver Software
Note: Check driver version. Find “USBXpress Device” in
the Device Manager under USB controllers.
Right-click and view properties. Check to make sure the
driver version matches the newest version (see Figure 12).
1. Install the correct USBXpress “.exe” file.
Choose either 32-bit or 64-bit operating system.
32-bit: USBXpressInstaller_x86.exe
64-bit: USBXpressInstaller_x64.exe
2. Connect the EVKT-USBI2C-02 communication interface
to the PC with the USB cable.
• No Supply
The MP8869S’s input pin has an under-voltage lockout
(UVLO) detection circuit. If the input voltage (AVIN) is
lower than the UVLO rising threshold, the MP8869S’s
functions are disabled.
Figure 12: Correct Driver Version
• Shutdown Event
If the MP8869S detects that the input voltage is lower than the UVLO falling threshold (enter no supply
state) or over-temperature protection is triggered (enter power-off state), the MP8869S switches to no
supply state or power-off state, regardless of the current state.
• Thermal Recovery
If the MP8869S is in a power-off state due to the die temperature exceeding the thermal protection
threshold, the MP8869S enters a power-on sequence once the die’s temperature decreases.
• Shutdown Sequence
When the input voltage is lower than the UVLO falling threshold or the IC is over-temperature, the
MP8869S immediately begins the shutdown sequence.
MonolithicPower.com
MP8869S Evaluation Kit User Guide Rev 1.1
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USER GUIDE – MP8869S EVALUATION KIT (EVKT-8869S)
Section 4. Ordering Information
The components of the evaluation kit can be purchased separately depending on user needs.
Part Number
Description
EVKT-8869S
Complete evaluation kit
Contents of EVKT-8869S
EV8869S-L-00A
EVKT-USBI2C-02
MP8869SGL evaluation board
Includes one USB to I2C communication interface, one USB cable,
and one ribbon cable
Order directly from MonolithicPower.com.
MonolithicPower.com
MP8869S Evaluation Kit User Guide Rev 1.1
10/14/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
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