Hardware Setup
7
SNVU495 – March 2016
Copyright © 2016, Texas Instruments Incorporated
LP8580 Evaluation Board
The VCC jumper can be used to select the input voltage for the onboard microcontroller. If the VCC
jumper is set to the 3.3-V side, the microcontroller is powered from the USB bus. A 3.3-V voltage regulator
is used to lower the 5-V input voltage from the USB port to 3.3 V. If the VCC jumper is set to RAIL side,
the microcontroller is powered from the same source as the LP8580 IC. This jumper also selects the
VDDIO voltage for the LP8580 IC.
3.3
Buttons
There are two push buttons on the EVM. Button S200 (FW LOAD) is used for microcontroller firmware
programming during LP8580EVM manufacturing and does require input from the user. Button S201
(RESET) can be used to reset the onboard microcontroller if firmware gets stuck for any reason.
3.4
Indicator LED
When LP8580EVM is connected to the USB port LED D201 should be blinking indicating that the firmware
of the onboard microcontroller is running. If LED D201 is not blinking, check that the VCC jumper is set to
the 3.3-V position or that the external power supply is connected.
3.5
Interface Setup
The LP8580 supports SPI and I2C interfaces. Interface selection of LP8580EVM shunts must be set
correctly for each interface.
and
show how to set up the shunts for each interface.
Figure 3. SPI Settings
Figure 4. I2C Settings
