Software Installation; Quick Setup - Analog Devices ADP5140-EVALZ User Manual

UG-1861
Measuring Efficiency
To measure the efficiency of the ADP5140, η, compare the input
power to the output power.
Measure the input and output voltages as close as possible to the
input and output capacitors to reduce the effect of voltage drop.
To measure the overall efficiency, enable all regulators and
draw the proper load current. To calculate the overall
efficiency, use the following equation:
V × I + V × I
η
= OUT 1 OUT 1 OUT 2
V
IN
Measuring Inductor Current
To measure the inductor current, remove one end of the inductor
from its pad and connect a current loop in series. A current probe
can be connected onto this wire.
Measuring Output Voltage Ripple
To observe the output voltage ripple, place the oscilloscope
probe across the output capacitor with the probe ground lead
connected to the negative capacitor terminal and the probe tip
placed at the positive capacitor terminal. Set the oscilloscope to ac,
10 mV/division, a 2 µs/division time base, and a 20 MHz
bandwidth.
A standard oscilloscope probe has a long wire ground clip. For
high frequency measurements, this ground clip picks up high
frequency noise and injects the noise into the measured output
ripple. Figure 2 shows a simplified way to measure the output
ripple properly. Remove the oscilloscope probe sheath and wrap
an unshielded wire around the oscilloscope probe. Keeping the
ground length of the oscilloscope probe as short as possible
allows the true ripple to be measured.
Figure 2. Measuring Output Voltage Ripple

SOFTWARE INSTALLATION

The ADP5140-EVALZ supports SPI communication with a
host. A dedicated GUI is associated with the ADP5140-EVALZ
for the user to access the registers in the ADP5140 for function
evaluation and system configuration.
To use this GUI, the USB-SDP-CABLEZ hardware is required.
+ ... + V × I
O UT 2 O UT 12 OUT 12
(1)
I
×
I N
Install the ADP5140 GUI
To install the ADP5140 GUI and the USB-SDP-CABLEZ driver
on the PC, take the following steps:
1. Launch the setup.exe file in the ADP5140 GUI file.
2. In the destination directory window that appears, it is
recommended to use the default values.
3. Click Next.
4. In the start installation window that appears, it is
recommended to use the default values.
5. Click Next.
6. In the installation complete window that appears, click
Next and then click Finish to complete the installation.
Installing the USB-SDP-CABLEZ driver
Attach the USB-SDP-CABLEZ to any USB port of the PC. The
operating system finds the new device and searches its driver
automatically.
When the driver installation is complete, the cable is recognized as
USB-SDP-CABLEZ.

QUICK SETUP

For a quick setup for evaluation using the GUI, take the
following steps:
1. Install the ADP5140 GUI software and USB-SDP-CABLEZ
driver on the PC, as described in the Software Installation
section.
2. Connect the dc power source to VIN (J3) and GND (J1)
with power-off status and set the voltage to 3.7 V.
3. Connect the USB-SDP-CABLEZ to P1, as shown in Figure 3.
4. Turn on the dc power source.
5. Start the GUI on the PC. The ADP5140-EVALZ is ready
for SPI communication.
Rev. 0 | Page 4 of 10
ADP5140-EVALZ
Figure 3. USB-SDP-CABLEZ Connection
User Guide