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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)
TSWITX-G4-EVM www.semtech.com 1 of 18 user guide rev 1.00 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 w ireless power transmitter controller and ts51231 transmitter controller. this evaluation mod ule, in conjunction with its compatible receiver, t he tswirx-5v2-evm or tswirx-li-evm, provides a complet e system solution for low-power, wearable infrastructure power transmission. objectives the objective of this user guide is to provide a fa st, easy and thorough method to experiment with and evaluate the semtech solutions for wireless chargin g systems. sufficient information is provided to support the engineer in all aspects of adding wirel ess charging support to their products. semtech off ers 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
TSWITX-G4-EVM www.semtech.com 2 of 18 user guide rev 1.00 receiver transmitter control electromagnetic flux controller coil driver power supply supply regulation rectifier end equipment power wireless charging concepts wireless power transfer is, essentially, a transfor mer. power is provided to a primary coil which prod uces an electromagnetic (em) field. in this field, a sec ondary coil is placed. the em field induces a curre nt into the secondary coil, providing power to whatever it is connected to. however, unlike a conventional power transformer th at operates at line frequencies and requires an iro n core for efficiency, low power wireless power syste ms for wearable devices have been designed to operate in the 1 mhz range, and thus can perform ef ficiently with an air core. as such, the primary an d secondary windings, if closely spaced, can be in se parate devices, the primary being part of a transmi tter and the secondary within a receiver. this implement ation can also be described as a radio broadcast process, and as such, these transformer coils can a lso be seen as antennas with equal validity, and th e two terms will be used interchangeably in this text . wireless power systems differ in another major aspe ct from conventional transformers, in that they are intelligently managed. a transmitter will only prov ide power when a receiver is present, and only prod uce the amount of power requested by the receiver. the intelligent management of the wireless power transmission process is achieved though the program ming of the ts80002, which first searches for a receiver. once found, the receiver informs the tran smitter of its power requirements, and transmission begins. the system then verifies the right amount o f power is being sent. the receiver will continuall y provide ongoing requests for power to maintain the transaction. if the requests cease, the transaction terminates. via this protocol, even complex chargin g 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 ch arge is completed, it can request no further power be sent, and the transmitter will reduce its output ac cordingly. wireless power systems have been broken into three basic power categories. wearable devices, such as headsets, wrist-band devices, medical sensors, a nd so forth - all operate in the low power range, u p 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 powe r wireless systems are intended to support devices such as power tools, radio controlled (rc) device s such as drones, and other equipment requiring 15 to 100 watts of power.
TSWITX-G4-EVM www.semtech.com 3 of 18 user guide rev 1.00 product description the TSWITX-G4-EVM evaluation module is a ready-to-u se demonstration platform allowing testing of approximately 1.25 watt of wireless power transmiss ion. the transmitter is coupled with its compatible rece iver 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 integ rate 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 p rovided to make the process as efficient as possibl e. the key technologies in the evm are the semtech ts8 0002 and ts51231 high efficiency integrated circuits. the ts80002 controls the system and imple ments the transfer protocols, while the ts51231 is the transmitter driver that powers the transmitter antenna. both devices can support systems deliverin g up to 5 watts of power, though this evm was designe d as an example of a system to provide about 1 watt of power. developers can vary the supporting compon entry to meet their goals as desired. in this user guide, an introduction will be provide d to the evaluator for how to use the evm for wirel ess power transmission as well as how the tswirx-5v2-ev m 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.
TSWITX-G4-EVM www.semtech.com 4 of 18 user guide rev 1.00 standard use the TSWITX-G4-EVM is easy to set up and use. connec t a usb cable from any usb port capable of driving up to 2 watts (most pcs will suffice) to th e 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 p ing of energy in search of a compliant receiver in rang e. 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 transmit ter 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 transmitte r begins providing the requested power. during powe r transfer, the receiver continuously communicates wi th the transmitter, actively directing the process. in this way, it is assured that power is only sent whe n and how it is required by an available and desiro us receiver C and in the way that is compatible with t he requirements of the receiver. if required, a rec eiver 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 rece iver, simply place the receiver over the target cir cle on the transmitter evm module. there will be 5v out put 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 i n observing power supply operation in general. if a l oad box is not available, a power resistor decade b ox is nearly as convenient, as it can easily be set to an y desired resistance to simulate a range of load conditions. if need be, a selection of resistors co uld 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 bei ng tested. finally, any device that uses a 1.25w powe r can be used as a test load should that be desired . whatever load is selected, wires must be run from t he vout+ and gnd pins of the receiver evm to the selected test load, as per the following illustrati on. once the load is added, the receiver evm can be used to perform a variety of tests.
TSWITX-G4-EVM www.semtech.com 5 of 18 user guide rev 1.00 connect a dc voltmeter across the vout+ and gnd pin s 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 ce nter of the transmitter target circle (the primary coil or transmitter antenna). once transmission begins, y ou should observe approximately 5 volts and 0 amperes on the meters. then turn the electronic loa d from 0ma to 250ma, you can observe the vout is constant.
TSWITX-G4-EVM www.semtech.com 6 of 18 user guide rev 1.00 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 co ntroller. 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 proce ss, 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 p art of a resonant circuit where considerably higher vol tages are developed. to observe the search ping, apply power to the tran smitter and remove the receiver from the target zon e. 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 th e 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 vo lts 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 abi lity to see the digital signal riding on the power modul ation more readily. note as you vary the load and t he location of the receiver on the target that the amp litude and frequency of the coil signal changes. th e greater the load, the more signal is sent to transf er the power required by the load. similarly, the l ess 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 exces s of 50 volts peak-to-peak in the most demanding conditions. measure efficiency by measuring the power from the receivers vout+ an d gnd pins in comparison to the power entering the transmitter evm, you can determine the efficien cy of the power transfer through the system. the diagram below was obtained from the TSWITX-G4-EVM a nd tswirx-5v2-evm. when measuring efficiency, be sure to remove the jumpers on the re ceiver 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
TSWITX-G4-EVM www.semtech.com 7 of 18 user guide rev 1.00 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 hard ware solution based on this design a. block diagram the TSWITX-G4-EVM may be divided into a number of s ub-blocks as show in the diagram below: 5 volt filter coil drive ts51231 controller ts80002 feedback signals matching network 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 i n conjunction with the receiver antenna feedback signals - adapt the antenna and drive values for use as fe edback input to the controller
TSWITX-G4-EVM www.semtech.com 8 of 18 user guide rev 1.00 b. schematic below are two copies of the schematic for the tswit x-g4-evm. the first will be best when viewed on- screen, as it is normally oriented and can be zoome d in on for readability. the second will allow bett er 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.
TSWITX-G4-EVM www.semtech.com 9 of 18 user guide rev 1.00 nrst 1 gpio1 2 gpio2 3 vss 4 ldo 5 vdd 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 gnd gnd gnd 1nf 100v c9 330k r7 22k r8 d1 100nf 10v c8 coil feedback 1k r9 4.7nf 100v c10 1k r11 10k r10 10k r12 1nf 10v c11 gnd gnd rx -> tx communication 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 tx coil ac1 ac2 1k r20 1 2 j2 led 0805 led1 green 1 2 3 4 j3 header 4 vcc5v gnd smb_sda smb_scl
TSWITX-G4-EVM www.semtech.com 10 of 18 user guide rev 1.00 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 solu tion. an excel spreadsheet file with this informati on is available on the semtech website as an added conven ience. 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 c2012c0g1h472j060aa 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 grm155r71h102ka01d 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 header 2.54mm i2c connector, 4 leads 21 j2 1 header 2.54mm led disconnect generic bridge 2.54mm, 2 leads 0.9mm; 22 jumper 1 black jumper 2.54mm 2.54mm jumper for j 2 23 c19 1 np 24 led1 1 led 0805 green led 0805 green
TSWITX-G4-EVM www.semtech.com 11 of 18 user guide rev 1.00 c. board layout the diagram below shows the locations of the compon ents 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.
TSWITX-G4-EVM www.semtech.com 12 of 18 user guide rev 1.00 d. board layers the TSWITX-G4-EVM pcb is based on a four layer desi gn as shown below. the ground plane in layer two is recommended to reduce noise and signal cross talk. 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
TSWITX-G4-EVM www.semtech.com 13 of 18 user guide rev 1.00 e. programming TSWITX-G4-EVM supports programming through i2c inte rface and a usb-i2c adapter. steps to program ts80002 using semtech wireless pow er gui and semtech usb-i2c adapter board: 1. order a semtech usb-i2c adapter board from semte ch. 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 boa rd; 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. th ere 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 vi a an usb cable, it will be powered on. 6. run semtech wireless power gui and choose ts8000 2_51 from "device tab
TSWITX-G4-EVM www.semtech.com 14 of 18 user guide rev 1.00 7. make sure status shows "connected". 8. click "firmware"browse the firmware you want to program 9. browse the firmware you want to program
TSWITX-G4-EVM www.semtech.com 15 of 18 user guide rev 1.00 10. then click "program" button then click "program " button
TSWITX-G4-EVM www.semtech.com 16 of 18 user guide rev 1.00 faqs q: what output voltage is provided by the tswitx-g4 -evm system? a: output voltage is receiver dependant. for the ts wirx-5v2-evm, the output is 5 volts. q: is the TSWITX-G4-EVM compliant with qi or anothe r 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, ma in body, and suffix, separated by dashes. the prefi x is comprised of three two letter groupings that each h elp define the product represented. as such, the pa rt number can be read as follows: prefix characters: 1+2 = company : ts = triune/semtech 3+4 = environment : dm = dual mode wi = wearable inf rastructure 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 infrastructur e, 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 high er power systems, but in low power wearable infrastructure systems there is no risk of overheat ing, rendering fod management unnecessary. q: what if my questions werent answered here? a: go to the semtech website as described on the ne xt 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.
TSWITX-G4-EVM www.semtech.com 17 of 18 user guide rev 1.00 next steps for more information on wireless power, go to the s emtech webpage at: https://www.semtech.com/power-management/wireless-c harging-ics/ you may also scan the bar code to the right to go t o the above web page: there you can find the downloadable copies of the s chematic, bom, and board artwork, as well as additional information on how to obtain semtech wir eless power products, from the chip level all the w ay to complete board modules, as your needs require.
TSWITX-G4-EVM www.semtech.com 18 of 18 user guide rev 1.00 important notice information relating to this product and the applic ation or design described herein is believed to be reliable, however such information is provided as a guide only and se mtech assumes no liability for any errors in this d ocument, or for the application or design described herein. semtech the latest relevant information before placing ord ers and should verify that such information is current and complet e. semtech reserves the right to make changes to th e product or this document at any time without notice. buyers sh ould obtain warrants performance of its products to the specifications applicable at the time of sale, and all sales are made in accordance with semtechs sta ndard terms and conditions of sale. semtech products are not designed, intended, author ized or warranted to be suitable for use in life-support applications, devices or systems, o r in nuclear applications in which the failure could be reasonably expected to result in p ersonal injury, loss of life or severe property or environmental damage. inclusion of semt ech 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 applicat ion, the customer shall indemnify and hold semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs dam ages and attorney fees which could arise. the semtech name and logo are registered trademarks of the semtech corporation. all other trademarks a nd trade names mentioned may be marks and names of semtech o r their respective companies. semtech reserves the right to make changes to, or discontinue any products descri bed in this document without further notice. semtec h makes no warranty, representation or guarantee, express or i mplied, regarding the suitability of its products f or 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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