This user’s guide is for the TPS25820 and TPS25821 Evaluation Modules (hereafter referred to as
TPS25820/21EVM) and explains how to get up and running with the TPS25820/21EVM. The EVM allows
the user to test specific features of the TPS25820 device by lighting-up signals LEDs and measuring test
points voltages to demonstrate what happens when different types of USB Type-C™ devices are attached
to the USB Type-C port on the EVM. Note that this EVM does not support BC1.2 charging. A TPS2514A
can be added to DP and DM lines of the USB Type-C connector for BC1.2 charging support. The
TPS25820/21EVM is built with a TPS25820. The TPS25820 has the same functionality of the TPS25821
with the only difference being VCONN. The TPS25821 does not supply VCONN when an electronically
marked cable is connected unlike the TPS25820.
1Introduction
The TPS25820 device is a simple to use USB Type-C controller with an integrated 1.5-A rated USB VBUS
power switch. The TPS25820 device meets the source requirements as defined in the USB Type-C
specification and implements the source state machine for the detection of USB Type-C device
attach/detach, connection orientation, and attached device type. For more information about the
TPS25820 and TPS25821 devices, see the TPS25820, TPS25821 USB Type-CTM 1.5-A Source
Table 1 lists the test points and the description of each test point.
Test PointLabelDescription
TP1GNDGround connecting for input and output signals
TP2IN1Input Voltage
TP3OUTOutput Voltage
TP4FAULT#Active low fault signal
TP5UFP#Active low Sink (SNK) detect signal
TP6POL#Active low polarity signal
TP7CC1CC1 Voltage
TP8CC2CC2 Voltage
The TPS25820/21EVM has two input-power Sources: a 5-V/3-A barrel jack adapter or a power supply
through J8 connector. These two power Sources provide power to the TPS25820 device IN pin by setting
jumper J7 either to barrel jack or to J1_IN as shown in Figure 4.
Powering Up the EVM
TI recommends a power adaptor that is a standard 2.1-mm DC power adaptor with a positive tip that can
support 5-V and 3-A. An example of a power adaptor to use is the WSU050-3000 wall power supply.
When using a power supply through J8 connector as a power source, make sure to stay within the
specified voltage limits for each pin listed in the data sheet
4.1Measuring TPS25820 Device Power Consumption
The TPS25820 device is powered through IN pin which is the same pin that powers OUT pin, thus the
easy way to measure power consumption is to connect an ammeter to jumper J7 on the EVM. Figure 5
shows how to connect the Ammeter to IN1 pin through J7 jumper (depending on how the EVM is
powered). For accurate power consumption measurements, remove jumpers J1 and J11 powering output
signals LEDs and BC1.2 device respectively.
When no Sink is attached to the USB port on the EVM, the TPS25820 consumes only 1 μA. To test this,
have the Ammeter connected properly to jumper J7, remove jumper J1 to disconnect output signals LEDs,
jumper J11 to disconnect TPS2514A device, jumpers J9 and J10 to disconnect Rd resistors for CC lines,
and make sure nothing is connected to the USB port.
Figure 5. Connecting the Ammeter to IN1 Pin and Pre-Selected Power Source
5Enabling and Configuring the TPS25820
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5.1Enabling and Disabling the TPS25820
The TPS25820 has an enable pin that creates a convenient way to turn on or off the device without
interrupting the power Source. Jumper J3 on the TPS25820/21EVM can be used to enable or disable
TPS25820 device, Figure 6 shows enable and disable positions for this jumper.
5.2Configuring the Broadcasted Current Limit for the TPS25820 Device
TPS25820 device can advertise (using CC lines) how much current it can supply to the attached Sink
device. The two current limits that the TPS25820 device support are: STD and 1.5-A. Jumper J6 allows
switching between these two current limit levels by either setting the jumper to 5-V (High) or to GND (Low)
which in turn sets CHG pin on the TPS25820 device to change the current limit advertisement level.
Figure 7 shows how to set Jumper J6 to advertise the desired current limit broadcast through the CC
lines.
Figure 6. How to Enable and Disable TPS25820 Device on the EVM
Figure 7. Jumper J6 Setting for Each Broadcasted Current Level
6TPS25820/21EVM Features
The TPS25820/21EVM allows for all the features of the TPS25820 device to be tested without a USB
Type-C Cable and external Sink device. This section lists the most common types of situations that can
happen with the TPS25820/21EVM and within each section is an explanation of how to test each situation
with and without external components. Remember how the test jumpers J9 and J10 (which control CC1
and CC2, respectively) connect to the TPS25820 device and the resistors. Figure 8 shows how these
resistors are connected.
TPS25820/21EVM Features
Figure 8. Schematic Showing How CC1 and CC2 are Connected to Jumpers J9 and J10
When connecting a physical USB Type-C Cable into the port of the EVM, make
sure to disconnect jumpers (J9, J10) and disconnect any loads on J4 connector
(which is connected to OUT pin) in order to avoid interference on the CC lines
Sink with Standard USB Type-&Œ&DEOH&RQQHFWHGSink with Full Featured USB Type-&Œ&DEOH&RQQHFWHG
Ra
CC1
R
Ra
CC2
R
J9J10
ONOFF
UFP# POL#
Normal
Cable
Orientation
Ra
CC1
R
Ra
CC2
R
J10J10
ONOFF
UFP# POL#
Flipped
Cable
Orientation
Ra
CC1
R
Ra
CC2
R
J10
ONOFF
UFP# POL#
Ra
CC1
R
Ra
CC2
R
J10
ONOFF
UFP# POL#
TPS25820/21EVM Features
6.1No Connection on the EVM
When nothing is connected to the output of the TPS25820/21EVM, the TPS25820 will not output any
power over the OUT pin. In this mode the TPS25820 device will consume only 1 μA.
In order to replicate this mode on the EVM, make sure that jumpers J1, J9, J10, and J11 are left open (not
set to any position) so that power goes only to the TPS25820 device.
6.2Connecting a Source (SRC) Device
The TPS25820 device is a Source and it continuously monitors the CC lines to detect if an SINK device is
attached. The way it determines if a SINK is attached by monitoring the voltages on CC lines to see if
these voltages get pulled down by an Rd resistors values. Connecting SOURCE device such as the
TPS25820 to another SOURCE device will not turn on the output of the TPS25820 device since both
Sources will continue to monitor their CC lines for a valid connection (Rd pull-down resistors). This can be
tested on the TPS25820/21EVM by connecting a known Source device to the USB Type-C port on the
EVM or by connecting two TPS25820/21EVMs via a USB Type-C cable.
6.3Connecting a Sink (SNK) Device
A Sink device can be attached to a Source device such as the TPS25820 via a standard USB Type-C
cable or a full-featured USB Type-C cable. The TPS25820 device detects that a Sink is attached by
sensing if any of the CC lines is pulled down by an Rd resistor value. If a Sink with a full-featured USB
Type-C cable is attached, then one CC line will be pulled down by an Rd resistor value while the other CC
line will be pulled down by a Ra resistor value, thus the TPS25820 device will supply VCONN on the CC
line with the Ra resistor value. The TPS25820/21EVM will report the polarity of the Sink device attached to
its USB port via POL# LED when a flipped USB Type-C cable is connected. To replicate those two types
of Sink connections along with their cable polarity orientations on the TPS25820/21EVM, set jumpers J9
(controls CC1) and J10 (controls CC2) based on Figure 9. Figure 9 shows UFP# and POL# signals LEDs
behavior based on jumper J9 and J10 settings.
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10
TPS25820 and TPS25821 Evaluation Module
Figure 9. Simulating a Sink (SNK) Device Connected to TPS25820/21EVM
The way the TPS25820 device detects a Sink device is attached is by checking if either of the CC lines is
connected to Rd resistor value, connecting only a full-featured USB Type-C cable to the port on the EVM
will not light-up UFP# and POL# LEDs since TPS25820 Sink attached signal will not be triggered. To
replicate such connection on the TPS25820 EVM, set jumpers J9 or J10 to apply Ra resistor value to CC
line as shown in Figure 10. Note that the UFP# and POL# LEDs will not light up.
Figure 10. Connecting a Full-Featured USB Type-C™ Cable to TPS25820/21EVM
TPS25820/21EVM Features
6.5Legacy Charging Support
The TPS25820/21EVM supports legacy USB charging scheme via TPS2514A device which supports
legacy battery charging schemes such as BC1.2. For more information about the TPS2514A device, refer
to the TPS2514A data sheet. Note that in order to connect legacy USB device to the TPS25820/21EVM, a
USB Type-C cable adaptor will be needed. Jumper J11 is used to enable or disable the TPS2514A
device. Figure 11 shows the schematic connection for the TPS2514A device. Note that the TPS2514A is
not populated on the TPS25820/21EVM and would need to be in order to support USB charging schemes.
There are two conditions that can cause this fault signal to occur and lights up FAULT# LED; those
conditions are:
1. The output of the TPS25820 exceeds the actual current limit.
2. The TPS25820 device exceeds the Rising threshold temperature for device shutdown or Rising
threshold temperature for OUT/VCONN switches shutdown in current limit.
As soon as the current and the temperature go back to their normal ranges, the fault signal is cleared,
FAULT# LED will turn off, and the device resumes normal operation. Refer to Electrical Characteristics
section located in the TPS25820 data sheet, for more information on the current and temperature
thresholds.
7.2Sink (SNK) device attached Detected (UFP# LED)
UFP# LED will turn on as soon as a Sink device is attached to the USB Type-C port and is communicating
properly through the CC lines. See Table 2 to determine the necessary conditions for the CC lines to
activate this signal.
Table 2. TPS25820 Responses Based on Port Connection Type
Polarity signal was introduced in USB Type-C plug connection since you can insert USB Type-C cable in
either orientation. The TPS25820 device detects the orientation of the USB Type-C Cable attached by
lighting up POL# LED when a Sink device with Flipped USB Type-C Cable is attached. Refer to Table 2 to
see what conditions for the CC lines are necessary to activate this signal.
TP1, TP92BlackTest Point, Miniature, Black, THBlack Miniature Testpoint5001Keystone
TP2, TP3, TP7, TP84RedTest Point, Miniature, Red, THRed Miniature Testpoint5000Keystone
U11USB Type-C 1.5 A DFP Controller and Power Switch, DSS0012BDSS0012BTPS25820DSSTexas Instruments
U21USB Dedicated Charging Port Controller, DBV0006A (SOT-23-6)DBV0006ATPS2514DBVTexas Instruments
FID1, FID2, FID30Fiducial mark. There is nothing to buy or mount.FiducialN/AN/A
•Keep input capacitors as close as possible to IC.
•USB protocol recommends having an input capacitance of 120 μF.
•Pullup resistors recommended being 100 kΩ.
•Keep CC lines close to the same length.
•Have the IN and OUT traces as short as possible and wide enough for 1.5-A (3-A if using two
TPS25820.
•The resistor attached to the REF pin and GND pin of the device has two requirements:
– The connection between the resistor and the GND pin should be isolated from the GND plane.
– Place the resistor as close as possible to REF pin.
11Trademarks
USB Type-C is a trademark of USB Implementer's Forum.
All other trademarks are the property of their respective owners.
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (September 2017) to A Revision ............................................................................................... Page
•Added TPS25821 evaluation module to the user's guide............................................................................ 4
•Changed caption on Figure 8............................................................................................................ 9
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