ST STEVAL-ISB68WA User Manual
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UM2693 User manual Getting started with STEVAL-ISB68WA wireless power receiver evaluation kit for wearable applications Introduction The STEVAL-ISB68WA is an evaluation kit based on STWLC68JRH wireless power receiver and it is designed as reference solution for wearable applications. The kit consists of a wireless receiver module and USB-to-I2C bridging dongle. The receiver is a 3-elements stack: a PCB housing the STWLC68JRH wireless power receiver and all the required external components, a 2 mm thick plastic spacer and a 15 mm diameter receiving coil facing the bottom side. Figure 1. Receiver module The module is configured to provide a constant 5 V output voltage with a maximum power capability of 2.5 W and it works out of the box when placed on a suitable wireless power transmitter.An on-board LED indicates when the communication with the transmitter succeeds and the power transfer is in progress.Thanks to the I2C interface, the module can be easily controlled and configured through the dedicated Graphical User Interface (GUI) by using the enclosed USB-to-I2C dongle. The complete reference application is confined in a 10x10 mm area of the PCB and all the components are intentionally spaced to ease probing and customization to the end user. UM2693 - Rev 1 - February 2020 For further information contact your local STMicroelectronics sales office. www.st.com UM2693 Wireless power receiver module 1 Wireless power receiver module Overview As visible in Figure 2, the schematic diagram of the wireless power receiver is relatively simple. The RX coil (J1J2 terminal) is part of the series resonant circuit (C1 through C4 capacitors) that provides the AC voltage to the AC1-AC2 pins of the STWLC68JRH. The rectified voltage is filtered by C15 through C17 capacitors and accessible at J3 connector, mainly used to monitor the ping-up behavior and the ASK modulation. The output rail (VOUT pins) is filtered by C18 through C20 capacitors and made available at J5 terminal. Few additional components are needed to complete the wireless receiver: bootstrap capacitors for the rectifier (C8 & C11) and for the main linear regulator (C12), modulation capacitors (C6, C7, C9 and C10) and filtering capacitors for the 1.8 V and 5 V supply rails (C13 & C14). The R1 resistor is connected between VRECT and IEXT to implement an active clamper to prevent excessive voltages (Over-Voltage Protection). Transient voltage Suppressors (D1 & D2) are recommended to protect the application against ESD. Figure 2. Receiver module schematic UM2693 - Rev 1 page 2/18 UM2693 Wireless power receiver module The terminals for the receiving coil, the output load and the control signals are summarized in Table 1. The output rail and the control interface are already made easily accessible by means of wires terminated with pin header female connectors (Figure 4). Table 1. Receiver module terminals Terminal Signal Wiring color J1 AC input (RX coil) - J2 AC input (RX coil) - J3 VRECT (rectifier output) - J4 Power return (ground) Black (P1) J5 VOUT power output Red (P1) J6 INT (digital output) Orange (P2) J7 SCL (digital input) Yellow (P2) J8 SDA (digital I/O) Green (P2) J9 Signal ground Blue (P2) Figure 3. Receiver module top and bottom silkscreen UM2693 - Rev 1 page 3/18 UM2693 Wireless power receiver module Figure 4. Receiver module wiring Additional control signals and programmable general-purpose I/O pins are available at the STWLC68JRH, but they are not used in the module to keep the reference solution as simple as possible. The STWLC68JRH chip can handle up to 400 kHz speed over the I2C bus. Table 2 summarizes the default STWLC68JRH settings that are retrieved from OTP memory at power-up. Values eventually changed via I2C registers are lost if the receiver module is removed from the transmitter, unless VOUT or VRECT rails are externally kept above 4V (e.g. as per Figure 7b). Table 2. Receiver module default settings UM2693 - Rev 1 Parameter Default setting Output voltage 5.0 V Minimum VRECT 4 V (output is disconnected if VRECT voltage is lower than this value) Dummy load 40 mA (minimum load current to ensure ASK communication stability) Nominal chip idle current consumption 17 mA (application dependent) Output current threshold for deeper ASK modulation 100 mA (if the output current is higher than this value, auxiliary modulation pins CLAMP1 and CLAMP2 are activated) GPIO0 pin function Open drain, low when output is enabled (D3 LED) INT pin function Open-drain, low in case of over-temperature, over-current or overvoltage condition. Over-Temperature protection Lower 80°C threshold leading to output disconnection and EPT generation to terminate power transfer. Upper 125°C threshold leading to AC1 and AC2 pins short-to-ground. Over-Voltage protection (VRECT rail) Lower 12 V threshold leading to temporary IEXT activation (VRECT clamping). Upper 25 V threshold leading to AC1 and AC2 pins short-toground. Over-Current protection 1.5 A threshold leading to output disconnection and EPT generation to terminate the power transfer. page 4/18 UM2693 Wireless power receiver module As already mentioned, a LED (D3) is connected to GPIO0 and it is used as output state monitor: it turns-on when a correct power transfer is established between the receiving module and the transmitter, and the output voltage is enabled. All the settings shown in table 2 (and other additional ones) can be modified in the registers page of the GUI (see the related GUI user manual for details). Table 3. Receiver module bill of material Component Value Description Part Number Manufacturer L1 11.8µH RX coil, 15 mm 760308101219 Wurth C1, C2, C3 47nF ±10% GRM155R71H473KE14D C4 100nF ±10% GCM155R71H104KE02D C5 1.8nF ±5% C7, C8, C10, C11 47nF ±10% C12 4n7 ±10% GCM155R71H472KA37D C6, C9 22nF ±10% GRM155R71H223KA12D C13, C14 2.2µF ±10% MLCC, X5R, 25V, 0402 GRM155R61E225KE11D Murata C15, C16, C17, C18, C19, C20 10µF ±20% MLCC, X5R, 25V, 0603 GRM188R61E106MA73D Murata D1, D2 12V Uni-directional TVS, SOD882 PESD12VS1UL NXP Red LED, 0402 SML-P12VTT86R Rohm Anti-surge resistor, 0.25 W, 0603 CRGP0603F100R TE Connectivity STWLC68JRH STMicroelectronics D3 R1 100R ±5% R2 470R ±5% R3, R4, R5 47k ±5% U1 UM2693 - Rev 1 MLCC, X7R, 50V, 0402 GRM155R71H182JA01D GRM155R71H473KE14D Murata Resistor, 0.1 W, 0201 Wireless power receiver, CSP-72 page 5/18 UM2693 USB to I2C bridging dongle 2 USB to I2C bridging dongle Overview The USB to I2C bridging dongle is the tool that allows interfacing the receiver to the Graphical User Interface running on a PC. The P2 connector signals are summarized in Table 4. Three LEDs monitor the operation of the bridge: D1 (green) indicates I2C bus activity, D2 (red) indicates correct initialization of the U1 chip and D3 (yellow) is a power-on indicator. When the dongle is plugged into the USB port, both D2 and D3 should be on. Figure 5. USB-to-I2C bridging dongle top view 1 2 3 4 VDD Figure 6. USB-to-I2C bridging dongle schematic 1 2 3 4 GP0 GP1 RST URx D+ DVUSB SCL 12 11 10 9 SCL C4 I/O1 GND I/O2 I/O1 VBUS I/O2 1 2 3 4 5 6 5 4 USBCL6-2 Shell 470nF C5 R1 100nF 1M GND P2 GND 1 SDA 2 SCL 3 MCP_INTB 4 RSTB 5 6 P1 Littelfuse 0603L025 U3 5 6 7 8 MCP2221 A F1 VBUS 1 2 3 UTx GP2 GP3 SDA MCP_RSTB MCP_INTB RST GND VDD NC NC VSS U1 VDD 16 15 14 13 A VBUS DD+ ID GND D4 VBUS Header connector STPS1L60ZFY Shield MicroUSB GP2 GP3 SDA GND GND GND GND B R4 4k7 VBUS 3 MCP_RSTB 1 G Q1 FDV303N C1 100nF 2 VDD C MCP_INTB GND R7 220R SCL GND R6 220R SDA R5 470R 1 R8 100k GND C2 1uF VIN INHIBIT LD2981 VOUT GND R3 4k7 RSTB NC 5 VDD 4 C3 2.2uF 2 R2 4k7 I2C communication U2 VDD D1 LED VDD VDD D2 LED D 3 D3 LED GP3 GP2 S1 SW-SPST R9 4k7 S C6 100nF VBUS RST VDD B GND GND GND C GND Table 4. USB-to-I2C bridging dongle P2 connector D Pin Signal Description 1 GND Common return (ground) 2 SDA I2C bus, SDA line Title 3 SCL I2C bus, SCL Sizeline Number 4 INTB Date: 14.2.2020 I/O line dedicated to INT pin management (status reading) Sheet of 1 UM2693 - Rev 1 RSTB Revision A4 File: 2 5 D STEVAL-USBI2C 3 C:\Projects\..\STEVAL-ISB68I2C.SchDoc Drawn By: 4 Reset signal for the STWLC68JRH chip, active low. Not used in the receiver module. page 6/18 UM2693 USB to I2C bridging dongle Pin 6 Signal Description VBUS Auxiliary supply rail. Used to supply the STWLC68JRH chip via VOUT when the receiver module is not placed on a transmitter. The D4 diode (see Figure 6) avoids backflow toward the USB supply rail when VOUT is higher than 5V. The receiver module must be connected to the dongle as shown in Figure 7a: the P2 connector of the receiver engages with the corresponding 4 signals of the P2 connector of the dongle. The communication over the I2C bus is possible only if the STWLC68JRH chip of the receiver is powered: when not placed on a transmitter, the receiver module can be powered through VOUT by wiring it to the VBUS pin of P2 (Figure 7b). This way of powering the receiver module is also required during OTP memory flashing. Figure 7. Connection between receiver module and dongle Table 5. USB-to-I2C bridging dongle bill of material Component Value Description Part Number Manufacturer C1, C5, C6 100nF ±10% MLCC, X7R, 50V, 0402 GCM155R71H104KE02D Murata C2 1uF ±10% MLCC, X7R, 25V, 0402 GRM155R61E105KA12D Murata C3 2.2uF ±20% MLCC, X7R, 6.3V, 0402 GRM155R60J225ME95D Murata C4 470nF ±10% MLCC, X7R, 16V, 0402 GRM155R61C474KE01D Murata D1 Red LED, 0603 150060VS55040 Wurth Elektronik D2 Green LED, 0603 150060RS55040 Wurth Elektronik D3 Yellow LED, 0603 150060YS55040 Wurth Elektronik D4 Schottky diode, 60V, 1A, SOD123 STPS1L60ZFY STMicroelectronics FDV303N ON-Semi R1 1M ±5% R2, R3, R4, R9 4k7 ±5% R5 470R ±5% R6, R7 220R ±5% R8 100k ±5% Q1 UM2693 - Rev 1 Resistor, 0.1W, 0402 N-channel MOSFET, 25V, 0.6A, SOT23 page 7/18 UM2693 USB to I2C bridging dongle Component UM2693 - Rev 1 Value Description Part Number Manufacturer P2 Pin header, 2.54 mm pitch U2 3.3V, 100 mA, Linear regulator, SOT23-5L LD2981CM33TR STMicroelectronics F1 Fuse, 0.25A, 0603 0603L025 Littelfuse U1 USB to I2C converter, QFN16 MCP2221A-I/ML Microchip U2 Linear regulator, 3.3V, 100 mA, SOT23-5L LD2981CM33TR STMicroelectronics U3 ESD suppressor, SOT23 USBCL6-2SC6 STMicroelectronics P1 Micro-USB connector 629105150921 Wurth Elektronik S1 SMT tactile switch, 6mm x3.5 mm P-DT2112C Diptronic page 8/18 UM2693 STEVAL-ISB68WA test setup 3 STEVAL-ISB68WA test setup The evaluation of the STEVAL-ISB68WA kit relies on a suitable wireless power transmitter that could mate with the coil of the RX module. A good coupling factor is essential for both power transfer efficiency and data communication reliability between the transmitter and the receiver. The STEVAL-ISB045V1 wireless power transmitter evaluation kit contains the reference transmitter for the test setup. The complete test setup is shown in Figure 8. Figure 8. STEVAL-ISB68WA evaluation setup The receiver is connected to the dongle as per Figure 7a and placed on the transmitter. Note: UM2693 - Rev 1 The transmitter must be configured (through its own GUI) to have a ping frequency of 120 kHz and a 130 kHz -170 kHz operating frequency range. These parameters are easily unlocked and configured in the “parameters” window (Figure 9). page 9/18 UM2693 STEVAL-ISB68WA test setup Figure 9. Configuration of the transmitter As soon as the LED on the receiver lights up, its control GUI can be launched. Connectivity with the STWLC68JRH is automatically verified and the chip info (IDs content) is shown in the registers page (Figure 10). UM2693 - Rev 1 page 10/18 UM2693 STEVAL-ISB68WA test setup Figure 10. Graphical User Interface registers page showing chip IDs To monitor the operation of the receiver, a real-time plotting of key parameters can be selected: in Figure 11 the VRECT and VOUT voltages, the temperature of the rectifier (TRECT) and its output current (ISNS) are shown. Figure 11. Graphical User Interface charts page plotting a variable output load UM2693 - Rev 1 page 11/18 UM2693 STEVAL-ISB68WA test setup The load at VOUT can be increased up to 2.5 W. A 10 Ω purely resistive load (i.e. 2.5 W load at 5 V) is usually managed without problems also at ping-up. In some case (e.g. a following DC-DC converter stage) the load could show a remarkable capacitive behavior and a relatively high initial current may trigger the over-current protection or may exceed the dynamic capability of the transmitter. To avoid this, the load should be smoothly increased, or its capacitive component should be reduced. Several parameters of the receiver module can be temporary changed through the GUI. Just to give an example, the output voltage can be changed on-the-fly by acting on the slider and writing the new value into the related register (Figure 12). Figure 12. Changing the output voltage to 6 V via GUI Note that increasing the output voltage may impact on the external components (e.g. proximity to maximum voltage rating of VRECT and VOUT capacitors or to clamping voltage of protection TVS diodes) and on some setting (the OVP threshold, for example, could be triggered if not conveniently adapted to the new operating conditions). Some transmitters may have inherent limitations and could terminate the power transfer if significant changes in the output voltage are applied. An extensive description of the GUI and its functionalities can be found in the related user manual, while the complete register map of STWLC68JRH can be found in its datasheet. Figure 13 reports the typical TX-to-RX efficiency of the paired STEVAL-ISB68WAM and STEVAL-ISB045V1T kits. Although the graph in Figure 13 has been extended to an output power of 3.5 W (0.7 A @ 5 V), the 2.5 W limit prevents over-heating of the RX coil. UM2693 - Rev 1 page 12/18 UM2693 STEVAL-ISB68WA test setup Figure 13. Transmitter input to receiver output overall efficiency UM2693 - Rev 1 page 13/18 UM2693 Revision history Table 6. Document revision history UM2693 - Rev 1 Date Version 19-Feb-2020 1 Changes Initial release. page 14/18 UM2693 Contents Contents 1 Wireless power receiver module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 USB to I2C bridging dongle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 STEVAL-ISB68WA test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 List of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 List of figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 UM2693 - Rev 1 page 15/18 UM2693 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Receiver module terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Receiver module default settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Receiver module bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 USB-to-I2C bridging dongle P2 connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 USB-to-I2C bridging dongle bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 UM2693 - Rev 1 page 16/18 UM2693 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. UM2693 - Rev 1 Receiver module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Receiver module schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Receiver module top and bottom silkscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Receiver module wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 USB-to-I2C bridging dongle top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 USB-to-I2C bridging dongle schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connection between receiver module and dongle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 STEVAL-ISB68WA evaluation setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Configuration of the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Graphical User Interface registers page showing chip IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Graphical User Interface charts page plotting a variable output load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Changing the output voltage to 6 V via GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Transmitter input to receiver output overall efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 page 17/18 UM2693 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2020 STMicroelectronics – All rights reserved UM2693 - Rev 1 page 18/18 ">
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