IntroductionThe STEVAL-ISB68RX is an evaluation board based providing a Qi-compliant (Qi specifications 1.2.4) reference solution for awireless power receiver with 5 W capability and based on the STWLC68JRH chip.

The STEVAL-ISB68RX consists of a PCB housing the STWLC68JRH and a 40 x 40 mm receiving coil: the two elements aremechanically mated through a plastic frame that also acts as 1.5 mm plastic spacer for the coil. The PCB board also embeds aUSB-to-I2C converter that directly interfaces with the STWLC68JRH, allowing the user to modify parameters and settings via aGraphical User Interface (GUI). The converter can be conveniently used to configure and control the final application via I2Cbus.

The STEVAL-ISB68RX has a default setting for a 5 V output voltage and full compliance with Baseline Power Profile (BPP).

Figure 1. STEVAL-ISB68RX

Getting started with the wireless power evaluation board for Qi inductive receiver with STWLC68JRH

UM2681

User manual

UM2681 - Rev 1 - February 2020For further information contact your local STMicroelectronics sales office.

www.st.com

1 Board overview

The STEVAL-ISB68RX evaluation board default configuration is optimized for performance.The board features:• STWLC68JRH wireless power receiver chip with up to 5 W output power capability (Qi specification 1.2.4,

BPP)• Constant 5 V output voltage (default setting)• Total (TX input to RX output) system efficiency up to 80%• Foreign Object Detection (FOD) supported• 400 kHz I2C interface for communication with host system (optional)• Built-in USB-to-I2C converter for interfacing to STWLC68JRH chip• Configurable GPIOs (e.g. status monitoring or auxiliary control signals)• Solder pads matrix for customization of evaluation board• Complete kit (Board with embedded receiving coil, Graphical User Interface control software)• RoHS compliant

UM2681Board overview

UM2681 - Rev 1 page 2/18

2 Board configuration and test points

The STEVAL-ISB68RX has several connectors and test points to ease access to key signals.• P1 connector: micro-USB female receptacle for connection of the USB-to-I2C converter to the host PC• P2 connector/jumper: bridging point between the I2C bus (on-board converter) and the STWLC68JRH.

Jumpers placed as per Figure 3 allow controlling the STEVAL-ISB68RX via GUI. If the jumpers are removed,the connector turns into the I2C bus access point for controlling external STWLC68JRH devices.

• P3 & P4 connectors: grounding points for probing.• P5 connector: auxiliary STWLC68JRH control signals access point. Programmable GPIOs, chip enable and

other STWLC68JRH pins are routed to this connector.• J3 jumper (VBUS->VOUT): this jumper connects the 5 V supply rail of the USB to the output of

STWLC68JRH. It is used to communicate with STWLC68JRH when the receiver is not placed on atransmitter (DC mode). Also used to supply the STWLC68JRH chip during OTP flashing. If closed, theSTEVAL-ISB68RX should not be put on transmitter.

• TP2: test-point connected to AC2 (rectifier input of STWLC68JRH).• TP3: test-point connected to AC1 (rectifier input of STWLC68JRH).• TP4: test-point connected to internal V1V8 LDO output (STWLC68JRH digital section supply rail).• TP5: test-point connected to internal V5V0 LDO output (STWLC68JRH analog section supply rail).• TP6: test-point connected to IEXT pin. Used to monitor the operation of the over-voltage protection (active

clamper).• VRECT connector: rectifier output voltage (VRECT pins of STWLC68JRH)• VOUT/GND connectors: main linear LDO regulator output voltage (VOUT pins of STWLC68JRH). Power

output rail of the wireless power receiver.• COIL connector: terminals for the receiving coil.

Figure 2. Top silkscreen of evaluation board

UM2681Board configuration and test points

UM2681 - Rev 1 page 3/18

3 Operating mode

The STEVAL-ISB68RX works out-of-the-box as a standalone wireless power receiver when placed on a suitabletransmitter. Default settings are automatically retrieved from OTP memory at power-up.The Graphic User Interface allows the user evaluating all the available functions of the STEVAL-ISB68RX, as wellas temporary changing the default parameter via I2C communication.The jumpers at connector P2 must be closed as shown in Figure 3 to connect the STWLC68JRH to the USB-to-I2C converter, then a USB cable can be plugged into P1 to connect the STEVAL-ISB68RX to the host PC. Beforelaunching the GUI on the host PC, the STEVAL-ISB68RX should be placed on an active transmitter, so that theSTWLC68JRH is properly powered and the I2C communication established.

Note: The enable pin of the STWLC68JRH is held low by the USB-to-I2C converter resulting in reset state ofSTWLC68JRH. By the opening the GUI, the USB-to-I2C converter is initialized and the STWLC68JRH isenabled.

Figure 3. Configuration of jumpers

The D1 LED is connected to the GPIO0 pin of the STWLC68JRH and it lights up when the output of the mainLDO linear regulator is enabled, i.e. when power transfer is established between the transmitter and the STEVAL-ISB68RX.

UM2681Operating mode

UM2681 - Rev 1 page 4/18

Figure 4. Output and indication LED

The STEVAL-ISB68RX has three additional LEDs dedicated to the USB-to-I2C converter: D8 LED indicates thecorrect initialization, D6 LED indicates I2C bus activity and D5 LED is the power-on indicator (USB supply rail).

Figure 5. Status LEDs

UM2681Operating mode

UM2681 - Rev 1 page 5/18

4 Default configuration of STWLC68JRH

The configuration settings of the STWLC68JRH chip are retrieved from the OTP memory at power-up, but theycan be temporary changed via GUI once the STEVAL-ISB68RX is powered by the transmitter and the modifiedvalues are kept until a reset of chip occurs.The default STWLC68JRH settings are the following ones:• The output voltage is set to 5.0 V.• The output is disabled if the VRECT voltage is lower than 4 V. This threshold is programmable, and it is used

to prevent the supply voltage of the STWLC68JRH from being too low because of severe output loadtransient or TX/RX coils misalignment.

• The output current limit is set to 1.5 A.• The INTB pin is set as open-drain and it is assigned to over-temperature, over-current and over-voltage

protections interrupts.• The dummy load is set to 40 mA. All wireless power systems are designed to transfer a minimum amount of

power, below which the ASK modulation and the output voltage regulation are not well controlled. Toovercome these problems and to ensure proper RX-to-TX communication stability, a dummy load functioncan be enabled. The dummy load is a constant current internally drawn at the VOUT output and itprogressively fades away as soon as the external load increases. The default 40 mA value is a good trade-off between internal power dissipation at no load and ASK communication stability over the full output powerrange.

• A deeper ASK modulation index is enabled when the output current is lower than 100 mA. TheSTWLC68JRH has two pairs of pins dedicated to ASK modulation. In normal conditions only the COMM1and COMM2 pins are used. In light-load conditions the CLAMP1 and CLAMP2 pair can be activated toprovide a deeper ASK modulation that significantly enhances the RX-to-TX communication signal-to-noiseratio.

• The output of STWLC68JRH is automatically enabled when the voltage at VRECT (output of the rectifier)crosses 5.08 V threshold.

• The nominal STWLC68JRH idle current is set to 17 mA. This current is application-dependent and reflectsthe consumption of the chip and the circuitry eventually connected to V5V0 and V1V8 pins. The value of thecurrent is important for the correct tuning of the Foreign Object Detection function.

• The GPIO0 pin is set as open-drain output and assigned to D1 LED, so that it lights on when the output isenabled.The STWLC68JRH implements over-temperature, over-voltage and over-current protections to preventdamage to the chip itself, to the load and to the external components. The device has two internaltemperature sensors, physically located close to the rectifier and to the main LDO linear regulator.

• The default setting for the over-temperature protection consists in disabling the output and sending EPTpacket to the transmitter in case one of the above-mentioned sensors detects more than 80 °C. As a furtherprotection, a second, higher threshold of 125 °C triggers an internal circuitry that shorts to ground both AC1and AC2 pins.

• The protection based on external NTC sensor is disabled by default. This function is mostly used to monitorand protect the receiving coil against over-heating.

• The over-voltage protection the STWLC68JRH monitors the voltage at the output of the rectifier. A lowerthreshold (set by default to 12 V) triggers a momentary VRECT clamper: the IEXT pin goes low and adischarge current flows through the external resistor connected between VRECT and IEXT. This action iseffective in reducing the VRECT voltage and generally it is intended to take place in case of brief, non-repetitive voltage spikes at VRECT (for example due to abrupt change in the coupling factor of the RX/TXcoils). Usually this protection does not interrupt the power transfer process. In STEVAL-ISB68RX the defaultsettings associate an EPT packet generation to this protection too, therefore the power transfer is terminatedby the transmitter.A higher threshold, set to 25 V, triggers the already mentioned AC1-AC2 short-to-ground mechanism as afurther safety.

• The output over-current protection is set to 1.5 A, resulting in output disconnection an EPT packetgeneration once triggered.

UM2681Default configuration of STWLC68JRH

UM2681 - Rev 1 page 6/18

5 Graphical User Interface (GUI)

The GUI offers a user-friendly interface to access and modify the STWLC68JRH registers. The same GUI is thetool, in conjunction with the on-board USB-to-I2C converter, to rely on for eventually tuning the final application.Figure 6 shows how to change the output voltage of the STEVAL-ISB68RX on-the-fly from the registers page. Byacting on the slider (or directly writing the desired value) and writing the related register, a new value is set.

Note: Increasing the output voltage may impact on the external components (e.g. proximity to maximum voltage ratingof VRECT and VOUT capacitors) and on some setting (the OVP threshold, for example, could be triggered if notconveniently adapted to the new operating conditions). Some transmitters may have inherent limitations andcould terminate the power transfer if significant changes in the output voltage are applied.

Figure 6. Changing of output voltage via GUI

The GUI also allows to monitor in real-time key parameters by reading the internal ADC channels of theSTWLC68JRH and plotting voltages, current and temperatures. Figure 7 shows the behavior of VRECT andVOUT voltages, as well as the rectifier output current (ISNS). For further details and a comprehensive descriptionof the GUI, please refer to the GUI user manual on www.st.com

UM2681Graphical User Interface (GUI)

UM2681 - Rev 1 page 7/18

Figure 7. Plotting key parameters via GUI

UM2681Graphical User Interface (GUI)

UM2681 - Rev 1 page 8/18

6 Baseline power profile (BPP) RX mode performance

Figure 8 reports the typical TX-input to RX-output efficiency of the STEVAL-ISB68RX placed on open-looptransmitter.

Figure 8. STEVAL-ISB68RX evaluation board performance: efficiency vs output power in BPP

UM2681Baseline power profile (BPP) RX mode performance

UM2681 - Rev 1 page 9/18

7 Schematic

Figure 9. Schematic of STEVAL-ISB68RX

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

D D

C C

B B

A A

Title

Number RevisionSize

A3

Date: 20.1.2020 Sheet ofFile: C:\Users\..\STWLC68 evaluation board steval v3.1.SchDocDrawn By:

RSTB

SDASCL

INTB

GPIO0GPIO1GPIO2GPIO3GPIO4

123456789

101112

P5

Header 12

PGND

1 2

VRECT

PGND

VRECT

VOUT

PGND

22nF

CM2

22nF

CL2

47nF

CBT2

22nF

CM1

22nF

CL1

47nF

CBT1

VRECTVSSAVSSA

CLAMP2CLAMP1VGATEVOUTVSSAVSSAVSSA

COMM2COMM1VOUTVOUTVOUTVSSD

VSS

AV

5V0

BO

OT1

BO

OT

VS

VO

UT

VSS

DV

SSD

VSS

AV

SSA

V5V

0N

TCD

FTV

SSD

VSS

DV

SSD

V1V

8V

SSA

VSSAV1V8GPIO1GPIO0VSSDVSSDVSSDVSSDVSSDSCLGPIO5GPIO4GPIO3GPIO2BOOT_SELRSTBINTBSDA

VSS

PA

C2

AC

2V

REC

TV

REC

TA

C1

AC

1V

SSP

VSS

PA

C2

AC

2V

REC

TV

REC

TA

C1

AC

1V

SSP

BO

OT2

IEX

T

D3

SMAJ22A

D2

SMAJ22APGNDPGND

BOOT2

CLAMP2

COMM2

BOOT1

CLAMP1

COMM1

AC

2

AC

1

3.9nFCPAR

100nFCS1

100nFCS2

100nFCS3

100nFCS4

1 2

COIL

COIL

CO

IL 1

CO

IL 2

1KR10

NCR11

AGND

4.7nFCBT V1V8

VR

ECT

1uFC3

100nFC4

V1V

8

AGND

10uFCR1

10uFCR2

10uFCR3

100nFCR4

VR

ECT

AGND

10uFCO1

10uFCO2

10uFCO3

100nFCO4

VO

UT

AGND

4.7uFC5

100nFC6

V5V

0

AGND

91RR1

91RR2

91RR3

VR

ECT

IEX

T

100KR8

DGND

4.7KR4

4.7KR5

VD

DM

CP_

SCL

MC

P_SD

A

GND

GND

470nF

C9

GND

SCLSDA

1MR9

100pFC10

GND GND GND

100nFC7

2.2uFC8

GND GND

220RR12

D6LED

VDD

MCP_RSTBMCP_INTB

AGNDPGNDDGND

VSS

A

VSS

P

VSS

DGND

1 2

J3

VOUT

10KR6

10KR16

PGND

RSTB

MCP_RSTB

V1V

8

G

SD

32

1

Q1FDV303N

I2C communication

STWLC68 is working without TX

STEVAL-ISB68RX

I/O11

GND2

I/O23 I/O2 4VBUS 5I/O1 6U3

USBLC6-2SC6

GP01

GP12

RST3

URx4

UTx

5

GP2

6

GP3

7

SDA

8

SCL 9VUSB 10D- 11D+ 12VSS

13N

C14

NC

15V

DD

16U2

MCP2221

D8LED

220RR14

D5LED

470RR13

VBUS

GND

VB

US

S1SW-SPST100nF

C1

RST

RST

GND

D4

STPS1L60ZFY

GND GND

0.47RR15

VGATE

D1

D2

G3 S 4D 5D 6

D7

S8

U4

STL7N6F7

VR

ECTCS5

DFT

Uni-Directional Uni-Directional

1234

GND

Header 4

11P3

11P4

VBUS1

D-2

D+3

ID4

GND5

ShieldShell

P1

MicroUSB

VSS

P_S

A1

AC

2_S

A2

AC

2A

3V

REC

TA

4V

REC

TA

5A

C1

A6

VSS

PB

1A

C2

B2

AC

2B

3V

REC

TB

4V

REC

TB

5A

C1

B6

BO

OT2

C1

IEX

TC

2

STW

LC68

/ V

ega

VRECT_SC3

VSSAC4

VSSA_SC5

NCC6

VGATED1

VOUTD2

VSSAD3

VSSAD4

VSSAD5

NCD6

VOUTE1

VOUTE2

VOUT_SE3

VSSDE4

VSS

A_S

G6

V1V

8_S

G5

VSS

DG

4V

SSD

G3

VSS

DG

2D

FTG

1

VSS

AF6

VSS

AF5

VSS

DF4

VSS

DF3

VO

UT

F2V

SF1

V5V

0_S

E6V

SSA

E5

GPIO1 H1GPIO0 H2VSSD_S H3VSSD H4VSSD H5VSSD H6

GPIO5 J1

AC

1_S

A7

VSS

PA

8

AC

1B

7V

SSP

B8

CLAMP2C7

CLAMP1C8

COMM2D7

COMM1D8

BO

OT1

E7

BO

OT

E8

V5V

0F7

NTC

F8

VSSA G7V1V8 G8

VSSD H7SCL H8

GPIO4 J2GPIO3 J3GPOI2 J4BOOT_SEL J5RSTB J6INTB J7SDA J8

U1STWLC68

V5V0

TP4

1 2 3 4

VOUT

4.7KR17

MC

P_IN

TB

TP5

TP6

TP2 TP3

TP7

1uFC2

GND

GND

VDD

VBUS

VBUS

VD

D

VD

D

VIN1

INHIBIT3 NC 4

VOUT 5

GN

D2

U5

LD2981

v2.0

MCP_SCLMCP_SDA

GND GND

MCP_INTB INTB1234

5678

P2

Header 4X2A

100RR7

D1LED0

V1V

8G

PIO

0

Coil Protections

RESET LED

STWLC68 3.3V LDO

USB-I2C convertor

Decoupling caps Connectors

Pull up resistors

DC mode

UM2681Schematic

UM2681 - Rev 1 page 10/18

8 BOM

Table 1. Bill of material

Item Q.ty Ref. Value Description Manufacturer Part number

1 10

C1, C4,C6, C7,CO4,CR4,CS1,CS2,CS3,CS4

100nF, 1005[0402], 50 VDC V,10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GCM155R71H104KE02D

2 6

CO1,CO2,CO3,CR1,CR2,CR3

10uF, 2012[0805], 35 VDC V, 10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRM21BR6YA106KE43L

3 6

TP2,TP3,TP4,TP5,TP6, TP7

TestPoint 1.5/0.8, Do not place DNP

4 4

CL1,CL2,CM1,CM2

22nF, 1005[0402], 50 VDC V, 10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRT155R71H223KE01D

5 3 R1, R2,R3

91R, 2012[0805], 91 R V, 500 mW, 5%,

Thick FilmResistors -SMD

Panasonic P91ADCT-ND

6 3 R4, R5,R17 4.7K, 1005[0402], Resistor Any

7 2 C2, C3 1uF, 1005[0402], 25 VDC V, 10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRM155R61E105KA12D

8 2 CBT1,CBT2 47nF, 1005[0402], 50 VDC V, 10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

TDK C1005X7R1H473K050BB

9 2 D2, D3 DO-214AC (SMA), 22 VDC V, ESDSuppressors SMAJ22A

10 2 GND,VOUT HDR1X4,

Header 1x4pin, 2.54mmpitch

Header, 4-Pin

11 2 J3,VRECT HDR1X2,

Header 1x2pin, 2.54mmpitch

Header, 2-Pin

12 2 P3, P4 2mm_PIN, Do not place DNP

13 2 R12, R14 220R, 1005[0402], Resistor Any

14 2 R6, R16 10K, 1005[0402], Resistor Any

UM2681BOM

UM2681 - Rev 1 page 11/18

Item Q.ty Ref. Value Description Manufacturer Part number

15 1 D5 Q_SMD_LED_0603_DIN1608M, 2VDC V, 20 m A, RED LED Wurth Electronik 150060RS55040

16 1 D6 Q_SMD_LED_0603_DIN1608M, 2VDC V, 20 m A, GREEN LED Wurth Electronik 150060VS55040

17 1 D8 Q_SMD_LED_0603_DIN1608M, 2VDC V, 20 m A, YELLOW LED Wurth Electronik 150060YS55040

18 1 C10 100pF, 1005[0402], Capacitor Any

19 1 C5 4.7uF, 1005[0402], 10 VDC V,20%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRM155R61A475MEAAD

20 1 C8 2.2uF, 1005[0402], 6.3 VDC V,20%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRM155R60J225ME95D

21 1 C9 470nF, 1005[0402], 16 VDC V,10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRM155R61C474KE01D

22 1 CBT 4.7nF, 1005[0402], 50 VDC V,10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GCM155R71H472KA37D

23 1 COIL 8uH, HDR1X2, Coil 760308102207

24 1 CPAR 3.9nF, 1005[0402], 50 VDC V,10%,

MultilayerCeramicCapacitorsMLCC -SMD/SMT

Murata GRM155R71H392KA01D

25 1 CS5 DNP, 1005[0402], Do not place DNP

26 1 D1 Q_SMD_LED_0603_DIN1608M, RED LED Wurth Electronik 150060RS55040

27 1 D4 SOD-123, 60 VDC V, 1 A, SchottkyRectifiers STMicroelectronics STPS1L60ZFY

28 1 P1 MICROUSB-629105150921,Fermale MicroUSB Type ABConnectors

Wurth Elektronik 629105150921

29 1 P2 HDR2X4_CEN,Header 2x4pin, 2.54mmpitch

Header, 4-Pin, Dual row

30 1 P5 HDR1X12,Header 1x12pin, 2.54mmpitch

Header, 12-Pin

31 1 Q1 G_SMD_SOT23_TO-236AB, 25VDC V, Id 680 mA, MOSFET ON

Semiconductors FDV303N

32 1 R10 1K, 1005[0402], Resistor Any

33 1 R11 DNP, 1005[0402], Do not place DNP

34 1 R13 470R, 1005[0402], Resistor Any

35 1 R15 0.47R, 2012[0805], 250 mW, Current SenseResistors Susumu RL1220S-R47-F

UM2681BOM

UM2681 - Rev 1 page 12/18

Item Q.ty Ref. Value Description Manufacturer Part number

36 1 R7 100R, 1005[0402], Resistor Any

37 1 R8 100K, 1005[0402], Resistor Any

38 1 R9 1M, 1005[0402], Resistor Any

39 1 S1 SWITCH_P-DT2112C, 12 VDC V,50 mA, Tactile Switche P-DT2112C

40 1 U1 WLC68_72BUMPS, Wirelesscharging IC STMicroelectronics STWLC68

41 1 U2 QFN16, USB InterfaceIC Microchip MCP2221A-I/ML

42 1 U3 SOT23-6L, ESDSuppressors STMicroelectronics USBLC6-2SC6

43 1 U4 PowerFLAT, VDS 60 VDC V, Id 7A, MOSFET STMicroelectronics STL7N6F7

44 1 U5 SOT23-5L, 3.3 VDC Output V, 100mA Output A,

LDO VoltageRegulators STMicroelectronics LD2981CM33TR

45 1 Plasticcase

46 4 Jumpers Sullins ConnectorSolutions QPC02SXGN-RC

UM2681BOM

UM2681 - Rev 1 page 13/18

Revision history

Table 2. Document revision history

Date Version Changes

20-Feb-2020 1 Initial release.

UM2681

UM2681 - Rev 1 page 14/18

Contents

1 Board overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2 Board configuration and test points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3 Operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

4 Default configuration of STWLC68JRH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5 Graphical User Interface (GUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6 Baseline power profile (BPP) RX mode performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

7 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

8 BOM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

List of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

List of figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

UM2681Contents

UM2681 - Rev 1 page 15/18

List of tablesTable 1. Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Table 2. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

UM2681List of tables

UM2681 - Rev 1 page 16/18

List of figuresFigure 1. STEVAL-ISB68RX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Figure 2. Top silkscreen of evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Figure 3. Configuration of jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Figure 4. Output and indication LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 5. Status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 6. Changing of output voltage via GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 7. Plotting key parameters via GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 8. STEVAL-ISB68RX evaluation board performance: efficiency vs output power in BPP. . . . . . . . . . . . . . . . . . . . 9Figure 9. Schematic of STEVAL-ISB68RX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

UM2681List of figures

UM2681 - Rev 1 page 17/18

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UM2681

UM2681 - Rev 1 page 18/18