Semtech TSWITX-G4-EVM User manual

TSWITX-G4-EVM
Wireless Charging Transmitter
www.semtech.com
WIRELESS CHARGING
User Guide
TSWITX-G4-EVM
Wireless Charging Transmitter
for TS51223-based Receivers
(Rev 1.00)

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Introduction
The Semtech TSWITX-G4-EVM is an evaluation platform for the test and experimentation of a wireless
charging transmitter based on the Semtech TS80002 Wireless Power Transmitter Controller and
TS51231 Transmitter Controller. This evaluation module, in conjunction with its compatible receiver, the
TSWIRX-5V2-EVM or TSWIRX-LI-EVM, provides a complete system solution for low-power, wearable
infrastructure power transmission.
Objectives
The objective of this User Guide is to provide a fast, easy and thorough method to experiment with and
evaluate the Semtech solutions for wireless charging systems. Sufficient information is provided to
support the engineer in all aspects of adding wireless charging support to their products. Semtech offers
a variety of solutions to meet the needs of a wide range of system developers. Developers are provided
with all the information on how this EVM was built as a starting point for their own designs using the
TS80002 and other Semtech components.
Table of Contents
Wireless Charging Concepts....................................................................................................2
Product Description .................................................................................................................3
Standard Use ..........................................................................................................................4
Documentation ........................................................................................................................7
A. Block Diagram..............................................................................................................7
B. Schematic....................................................................................................................8
C. Board Layout..............................................................................................................11
D. Board Layers..............................................................................................................12
E. Programming .............................................................................................................13
FAQs.....................................................................................................................................16
Next Steps.............................................................................................................................17

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Receiver
Transmitter
Control
Electromagnetic
Flux
Controller CoilDriver
Power
Supply
Supply
Regulation Rectifier
End
Equipment
Power
Wireless Charging Concepts
Wireless power transfer is, essentially, a transformer. Power is provided to a primary coil which produces
an electromagnetic (EM) field. In this field, a secondary coil is placed. The EM field induces a current into
the secondary coil, providing power to whatever it is connected to.
However, unlike a conventional power transformer that operates at line frequencies and requires an iron
core for efficiency, low power wireless power systems for wearable devices have been designed to
operate in the 1 MHz range, and thus can perform efficiently with an air core. As such, the primary and
secondary windings, if closely spaced, can be in separate devices, the primary being part of a transmitter
and the secondary within a receiver. This implementation can also be described as a radio broadcast
process, and as such, these transformer coils can also be seen as antennas with equal validity, and the
two terms will be used interchangeably in this text.
Wireless power systems differ in another major aspect from conventional transformers, in that they are
intelligently managed. A transmitter will only provide power when a receiver is present, and only produce
the amount of power requested by the receiver. The intelligent management of the wireless power
transmission process is achieved though the programming of the TS80002, which first searches for a
receiver. Once found, the receiver informs the transmitter of its power requirements, and transmission
begins. The system then verifies the right amount of power is being sent. The receiver will continually
provide ongoing requests for power to maintain the transaction. If the requests cease, the transaction
terminates. Via this protocol, even complex charging patterns can be supported, as the transmitter can
provide varying amounts of power at different times, as requested by the receiver. Should the receiver
require no further power, such as when a battery charge is completed, it can request no further power be
sent, and the transmitter will reduce its output accordingly.
Wireless power systems have been broken into three basic power categories. “Wearable” devices, such
as headsets, wrist-band devices, medical sensors, and so forth - all operate in the low power range, up to
5 watts. Medium power devices, in the 5- to 15-watt range, include most handheld devices, such as cell
phones, tablets, and medical electronics. High power wireless systems are intended to support devices
such as power tools, radio controlled (“RC”) devices such as drones, and other equipment requiring 15 to
100 watts of power.

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Product Description
The TSWITX-G4-EVM Evaluation Module is a ready-to-use demonstration platform allowing testing of
approximately 1.25 watt of wireless power transmission.
The transmitter is coupled with its compatible receiver module, the Semtech TSWIRX-5V2-EVM, to form a
complete wireless power transmission system. TSWIRX-5V2-EVM can output 5V/250mA max in this
system.
Those who wish to develop their own board, or integrate this functionality into an existing system can use
the EVM as a starting point for their design, as it demonstrates a working model from which to proceed.
Toward this end, all documentation for the EVM is provided to make the process as efficient as possible.
The key technologies in the EVM are the Semtech TS80002 and TS51231 high efficiency integrated
circuits. The TS80002 controls the system and implements the transfer protocols, while the TS51231 is
the transmitter driver that powers the transmitter antenna. Both devices can support systems delivering
up to 5 watts of power, though this EVM was designed as an example of a system to provide about 1 watt
of power. Developers can vary the supporting componentry to meet their goals as desired.
In this user guide, an introduction will be provided to the evaluator for how to use the EVM for wireless
power transmission as well as how the TSWIRX-5V2-EVM can be used in conjunction with it.
Once the system is set up and working, a selection of tests and activities will be described that the
evaluator can choose to perform.

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Standard Use
The TSWITX-G4-EVM is easy to set up and use. Connect a USB cable from any USB port capable of
driving up to 2 watts (most PCs will suffice) to the USB port on the EVM. On application of power, the
green LED should light, indicating the board is now active.
At this point, the EVM is ready to transmit power. A few times each second, the transmitter emits a ‘ping’
of energy in search of a compliant receiver in range.
When in range, the receiver is powered by the ping sufficiently to be able to announce its presence to the
transmitter, and a transaction begins. The transmitter provides a small amount of power to the newly
discovered receiver, so it can tell the transmitter what its power requirements are.
At the completion of this handshake, the transmitter begins providing the requested power. During power
transfer, the receiver continuously communicates with the transmitter, actively directing the process. In
this way, it is assured that power is only sent when and how it is required by an available and desirous
receiver – and in the way that is compatible with the requirements of the receiver. If required, a receiver
can actively increase or decrease its power request, and the transmitter will act accordingly. As such,
equipment with complex charging requirements can be precisely supported and only the desired amount
of power is provided.
EVM Receiver Tests
A variety of tests can be performed with the use of the TSWIRX-5V2-EVM receiver module.
In order to use the TSWIRX-5V2-EVM as a target receiver, simply place the receiver over the target circle
on the transmitter EVM module. There will be 5V output on RX output.
The optimal load to select would be a Programmable DC Electronic Load. A ‘load box’ can easily be set
to draw a selected current or power at the turn of a knob, making them very flexible and easy to use in
observing power supply operation in general. If a load box is not available, a power resistor decade box is
nearly as convenient, as it can easily be set to any desired resistance to simulate a range of load
conditions. If need be, a selection of resistors could be used as test loads, though without the ease of
modification of the prior options. Be sure the test load is rated for at least the amount of power being
tested. Finally, any device that uses a 1.25W power can be used as a test load should that be desired.
Whatever load is selected, wires must be run from the VOUT+ and GND pins of the receiver EVM to the
selected test load, as per the following illustration. Once the load is added, the receiver EVM can be used
to perform a variety of tests.

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Connect a DC voltmeter across the VOUT+ and GND pins to monitor the voltage being output to the load,
and a DC ammeter in series with the VOUT+ line. Set levels to allow for up to 10 volts and 1 amp to be
observed.
With no load selected, place the receiver on the center of the transmitter target circle (the ‘primary coil’ or
‘transmitter antenna’). Once transmission begins, you should observe approximately 5 volts and 0
amperes on the meters. Then turn the Electronic Load from 0mA to 250mA, you can observe the Vout is
constant.

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Observe Coil Signals
The following information is not required in order to use the EVM, as what can be observed below is
entirely managed by the Semtech TS80002 Wireless Controller. However, it allows the observer an
opportunity to see how the receiver and transmitter actively manage the wireless power process.
If you wish to observe the intrinsic wireless process, place an oscilloscope probe on one antenna lead,
with the probe ground run to the board ground (the outer casing of the USB port will suffice). Be sure the
scope can handle signals up to 100 volts. While the EVM power supply is only 5 volts, the antenna is part
of a resonant circuit where considerably higher voltages are developed.
To observe the search ping, apply power to the transmitter and remove the receiver from the target zone.
The scope should display a ‘chirp’ of 0.5 to 1mSec in duration with an initial peak of 30 to 35 volts. The
frequency within the envelope of the chirp is in the 1-1.15 MHz range.
Next, place the receiver on the transmitter target. With the scope set to 0.2 to 1 uSec and 2 to 10 volts
per division, you should observe a ‘fuzzy sinewave’ signal that is a composite of the sinusoidal power
signal with an additional component produced by the much lower frequency digital communication
between the receiver and transmitter. Observing the signal in the 1 to 5 mSec range will allow the ability
to see the digital signal riding on the power modulation more readily. Note as you vary the load and the
location of the receiver on the target that the amplitude and frequency of the coil signal changes. The
greater the load, the more signal is sent to transfer the power required by the load. Similarly, the less well
coupled the receiver antenna is to the transmitter coil, the more power must be sent to compensate for
the inefficient misalignment. You may note in excess of 50 volts peak-to-peak in the most demanding
conditions.
Measure Efficiency
By measuring the power from the receiver’s VOUT+ and GND pins in comparison to the power entering
the transmitter EVM, you can determine the efficiency of the power transfer through the system. The
diagram below was obtained from the TSWITX-G4-EVM and TSWIRX-5V2-EVM. When measuring
efficiency, be sure to remove the jumpers on the receiver and transmitter that enable the status LEDs, as
these will affect the measurements.
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
0mA
10mA
20mA
30mA
40mA
50mA
60mA
70mA
80mA
90mA
100mA
110mA
120mA
130mA
140mA
150mA
160mA
170mA
180mA
190mA
200mA
210mA
220mA
230mA
240mA
250mA
Efficiency vs Load

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Documentation
The following sections document the hardware design of the TSWITX-G4-EVM. This information can be
used to better understand the functionality of the design, as well as assist in creating your own hardware
solution based on this design
A. Block Diagram
The TSWITX-G4-EVM may be divided into a number of sub-blocks as show in the diagram below:
5 Volt
Filter
Coil Drive
TS51231
Controller
TS80002
Feedback
Signals
Matching
Net ork
Antenna:
Transmit
5 Volt
USB Input
Antenna:
Receive
5 Volt Filter - smooths the 5 volt input supply
Controller - based on the TS80002 Wireless Power Controller; manages all operations of the transmitter
Coil Driver - based on the TS51231 Transmitter Driver, powers the antenna based on inputs from
controller
Antenna: Transmit - acts as the primary of an air-core transformer in conjunction with the receiver
antenna
Feedback Signals - adapt the antenna and drive values for use as feedback input to the controller

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B. Schematic
Below are two copies of the schematic for the TSWITX-G4-EVM. The first will be best when viewed on-
screen, as it is normally oriented and can be zoomed in on for readability. The second will allow better
use in print-out form, as the landscape orientation allows a larger image to be provided. For each,
annotation has been added to indicate which part of the block diagram each component is a member of.

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NRST
1
GPIO1
2
GPIO2
3
VSS
4
LDO
5VDD
6
ALERT 7
SDA 8
SCL 9
PWM1_L 10
PWM2_L 11
GPIO3
12
PWM1_H 13
PWM2_H 14
DEBUG
15
V_AC 16
I_DC 17
GPIO4 18
VREF 19
V_DC 20
U1
TS80002
1uF
6.3V
C5
GND
VCC5V
1uF
6.3V
C3
GND
10nF
10V
C4
GND
RESET
DEBUG
TP1
TP2
TP3
TP4
GND
VCC5V
RESET
DEBUG SCL
SDA
SW 11
VIN 15
NC 5
GND
8
EN
1
nFLT
4
VDD
7
HSON
6
VIN 16
SCL
3
SDA
2
SW 12
PGND 13
PGND 14
PAD 17
NC 9
BOOT 10
U2
TS51231
VCC5V
100nF
10V
C2
22uF
6.3V
C1
GND
100nF
10V
C7
GND
4.7nF
50V
C6
GND
GNDGND GND
1nF
100V
C9
330K
R7
22K
R8
D1
100nF
10V
C8
CoilFeedback
1K
R9
4.7nF
100V
C10
1K
R11
10K
R10
10K
R12
1nF
10V
C11
GND GND
RX->TXCommunication
100nF
10V
C12
VCC5V
GND
SCL
SDA
DONE
22uF
6.3V
C17
GND
22nF
10V
C18 4.7nF
50V
C16
NC
C19
22uF
6.3V
C21
DONE TP5
AC1
AC2
SMB_SCL
SMB_SDA
VBUS
1
D-
2
D+
3
GND
5
x
4
SHLD 6
7
8
9
J1
5V IN
GND
VCC5V
TXCoil
AC1
AC2
1K
R20
1 2
J2
LED 0805
LED1
GREEN
1
2
3
4
J3
Header 4
VCC5V
GND
SMB_SDA
SMB_SCL

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Bill Of Materials “BOM”
Below is a listing of the parts used in the TSWITX-G4-EVM. Note that only a few dozen components were
required to implement the complete transmitter solution. An excel spreadsheet file with this information is
available on the Semtech website as an added convenience.
Required Circuit Components
SN
Designator Qt.
Item Description Manufacturer
1
C1, C17, C21 3
C1608X5R0J226M080AC
0603 22uF 6.3V TDK
2
C2, C7, C8, C12 4
GRM155R71A104KA01# 0402 100nF 10V Murata
3
C3, C5 2
C1005X5R0J105K050BB 0402 1uF 6.3V TDK
4
C4 1
GRM155R71C103KA01D 0402 10nF 10V Murata
5
C6, C16 2
C2012C0G1 472J060AA 0805 4.7nF 50V C0G TDK
6
C9 1
C1608X7R2A102K080AA 0603 1nF 100V X7R TDK
7
C10 1
C1608X7R2A472K080AA 0603 4.7nF 100V X7R TDK
8
C11 1
GRM155R71 102KA01D
0402 1nF 10V
Murata
9
C18 1
GRM155R71E223KA61D 0402 22nF 10V
Murata
10
D1 1
1SS400T1G Diode 200V 1SS400T1G ON
11
J1 1
USB_Micro_B Micro USB connector 5V IN
12
R7 1
Resistor 0402 330K 1%
13
R8 1
Resistor 0402 22K 1%
14
R9, R11 2
Resistor 0402 1K 1%
15
R10, R12 2
Resistor 0402 10K 1%
16
U1 1
TS80002-QFN Wireless Power Controller Semtech
17
U2 1
TS51231 Transmitter Semtech
18
AC1,AC2 1
WT252512-8F2-SM coil TDK
Other Components
SN
Designator Qt.
Manufacturer Code Description Manufacturer
19
R20 1
Resistor 1K
20
J3 1
eader 2.54mm I2C connector, 4 leads
21
J2 1
eader 2.54mm
LED disconnect Generic Bridge
2.54mm, 2 Leads 0.9mm;
22
Jumper 1 Black Jumper 2.54mm 2.54mm Jumper for J2
23
C19 1
NP
24
LED1 1
LED 0805 Green LED 0805 Green

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C. Board Layout
The diagram below shows the locations of the components used in the TSWITX-G4-EVM PCB. Note that
the transmitter solution itself fits easily inside a 10x14mm rectangle with single-sided construction.
Smaller layouts can readily be created if required.

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D. Board Layers
The TSWITX-G4-EVM PCB is based on a four layer design as shown below. The ground plane in layer
two is recommended to reduce noise and signal crosstalk. The EVM placed all components on the top of
the board for easier evaluation of the system. End product versions of this design can be made
significantly smaller by distributing components on both sides of the board. The Gerber files for this
artwork can be downloaded from the Semtech web page.
Top Layer Ground Plane
Signal Layer Bottom Layer

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E. Programming
TSWiTX-G4-EVM supports programming through I2C interface and a USB-I2C adapter.
Steps to Program TS80002 using Semtech Wireless Power GUI and Semtech USB-I2C adapter board:
1. Order a Semtech USB-I2C adapter board from Semtech. There is one adapter board in EVM kit.
2. Install the wireless power GUI. Please download from:
http://www.semtech.com/apps/product.php?pn=TS80000
3. Find the 20 pin header J2 on USB-I2C adapter board; connect it to J3 on TSWITX-G4-EVM.
J2 on adapter: Pin1 (VCC), Pin3 (SDA), Pin4 (SCL), Pin20 (GND)
J3 on EVM: Pin1 (VCC), Pin2 (SDA), Pin3 (SCL), Pin4 (GND)
There is an I2C cable in EVM kit to connect adapter and EVM: Red wire is VCC, Grey is SDA, Green
is SCL, and Black is GND.
4. Short Debug pin to GND on your TS80002 board. There is a “DEBUG” test point on EVM, it is ease to
connect to “GND” next to it.
5. Connect your USB-I2C adapter board to your PC via an USB cable, it will be powered on.
6. Run Semtech Wireless Power GUI and choose TS80002_51 from "Device” tab

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7. Make sure Status shows "Connected".
8. Click "Firmware"browse the firmware you want to program
9. browse the firmware you want to program

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10. Then click "Program" button Then click "Program" button

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FAQs
Q: What output voltage is provided by the TSWITX-G4-EVM system?
A: Output voltage is receiver dependant. For the TSWIRX-5V2-EVM, the output is 5 volts.
Q: Is the TSWITX-G4-EVM compliant with Qi or another wireless transmission standard?
A: These low power wearable solutions are not based on existing standards in order to employ smaller
coils and other optimizations that better suit the low power system environment.
Q: Does the EVM part number represent something in particular?
A: Yes. The part number is broken into a prefix, main body, and suffix, separated by dashes. The prefix is
comprised of three two letter groupings that each help define the product represented. As such, the part
number can be read as follows:
Prefix characters:
1+2 = Company : TS = Triune/Semtech
3+4 = Environment : DM = Dual Mode I = earable Infrastructure
5+6 = Type : TX = Transmit RX = Receive
Mid-section = Device Voltage or Wattage
Suffix = Equipment type:
EVM = Evaluation Module
MOD = Production Module
Thus, the TSWITX-G4-EVM is a Wearable Infrastructure, Transmitter Evaluation Module provided by
Semtech.
Q: Does the TSWITX-G4-EVM implement Foreign Object Detection (FOD)?
A: FOD detection is an important protection in higher power systems, but in low power wearable
infrastructure systems there is no risk of overheating, rendering FOD management unnecessary.
Q: What if my questions weren’t answered here?
A: Go to the Semtech website as described on the next page. An updated FAQ for the TSWITX-G4-EVM
is maintained there and may contain the answers you’re looking for. Your local Semtech FAE can also
assist in answering your questions.

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Next Steps
For more information on Wireless Power, go to the Semtech webpage at:
https://www.semtech.com/power-management/wireless-charging-ics/
You may also scan the bar code to the right to go to the above web page:
There you can find the downloadable copies of the schematic, BOM, and board artwork, as well as
additional information on how to obtain Semtech wireless power products, from the chip level all the way
to complete board modules, as your needs require.

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IMPORTANT NOTICE
Information relating to this product and the application or design described herein is believed to be reliable, however
such information is provided as a guide only and Semtech assumes no liability for any errors in this document, or for
the application or design described herein. Semtech the latest relevant information before placing orders and should
verify that such information is current and complete. Semtech reserves the right to make changes to the product or
this document at any time without notice. Buyers should obtain warrants performance of its products to the
specifications applicable at the time of sale, and all sales are made in accordance with Semtech’s standard terms
and conditions of sale.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE
IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS, OR IN NUCLEAR APPLICATIONS IN WHICH THE
FAILURE COULD BE REASONABLY EXPECTED TO RESULT IN PERSONAL INJURY, LOSS OF LIFE OR SEVERE
PROPERTY OR ENVIRONMENTAL DAMAGE. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS
UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use
Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its
officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney
fees which could arise.
The Semtech name and logo are registered trademarks of the Semtech Corporation. All other trademarks and trade
names mentioned may be marks and names of Semtech or their respective companies. Semtech reserves the right to
make changes to, or discontinue any products described in this document without further notice. Semtech makes no
warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular
purpose. All rights reserved.
© Semtech 2015
Contact Information
Semtech Corporation
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111, Fax: (805) 498-3804
www.semtech.com
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