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MP8869S Evaluation Kit User Guide rev 1.0
MonolithicPower.com
7/17/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
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 USBI2C
uses Cyusb3. USBI2C-02 is the recommended device for MPS PMBus and I2C.
EVKT-USBI2C-01
In case that 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 driver located on thumb drive and install.
EVKT-USBI2C-02
In the case that the USBI2C-02 driver is not properly
installed, manual installation is required. Follow the
steps below.
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. Browse the thumb drive contents and open the
driver’s folder.
2.
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
3. Connect the EVKT-USBI2C-02 Dongle to the PC
with the USB cable.
•
No Supply
The M
P8869S’s input pin has an under-voltage lockout
(UVLO) detection circuit. If the input voltage (AVIN) is lower than the UVLO rising threshold, the
M
P8869S’s functions are disabled.
•
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 when 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 enters the shutdown sequence directly.
Figure 12: Correct Driver Version
Figure 11: Updating the Driver Software