ST STEVAL-ISB042V1 Manual de usuario
Introduction
The STEVAL-ISB042V1 is a 15-watt Qi and 5-watt Airfuel inductive (former PMA) wireless power receiver evaluation board
based on the STWLC33 wireless power receiver solution for the WPC/Airfuel mobile device with dual mode coil.
The board lets you evaluate the STWLC33 capabilities as a Qi/Airfuel inductive receiver as well as its ability to power another Qi
receiver.
The solution is certified in accordance with the extended power profile Qi v1.2 and Airfuel SR1 standard.
The STWLC33 IC is powered by a dual mode Rx coil attached to a 1.5 mm thick plastic fixture.
The STWLC firmware offers users the flexibility to modify parameters and settings to ensure proper integration of the STWLC33
device with the final application.
The layout is based on a cost-effective 4-layer PCB.
Figure 1. STEVAL-ISB042V1 evaluation board
Getting started with the dual mode wireless power evaluation board for Qi and Air-
fuel inductive receiver and Qi-based transmitter with STWLC33
UM2289
User manual
UM2289 - Rev 2 - December 2017
For further information contact your local STMicroelectronics sales office.
www.st.com/
1 Getting started
1.1 Board configuration and test points
• P3 solder bridge:
– open = I²C bus and INT pin pull-up voltage provided externally via J5 header
– shorted = I²C bus and INT pin pull-up voltage provided by STWLC33 (do not connect any load/source
to J5 header)
• P9 solder bridge:
– open = USB port acts as unknown (D+/D- floating)
– shorted = USB port acts as a dedicated charging port (shorted D+/D-)
• J3 testpoint header:
– VRECT rectified voltage
• J4 testpoint header:
– selectable user functions (GPIO0, GPIO1, GPIO2, GPIO4)
– GPIO3 – do not connect any load during startup
– INT – open drain interrupt output (active low)
– EN – enable input (active low), pull on-board R4 down
1.2 Receiver mode
The easiest way to test the STEVAL-ISB042V1 evaluation board in receiver mode is to connect the load to J2
header or, optionally, to J1 USB connector and place it on the transmitter surface.
J1 and J2 connectors are essentially different connectors for the same output node.
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Getting started
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Figure 2. STEVAL-ISB042V1 evaluation board: receiver mode
D6 indication LED lights up when the receiver enters the Power Transfer phase.
1.3 Transmitter mode
To test the board in Tx mode, you must provide a 5 V power supply to the J2 header (ensure STWLC33 is not
operating in Rx mode power transfer) and switch STWLC33 to Tx mode over I²C interface (J8 header).
Procedure Step 1. Connect the bundled USB to the I²C bridge.
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Transmitter mode
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Figure 3. STEVAL-ISB042V1 evaluation board: transmitter mode
Step 2. Use the PC GUI application.
Step 3. Connect the I²C bridge.
Step 4. Switch to TX mode tab.
Step 5. Click Load binary image button.
Step 6. Select the GUI STWLC33_TxMode_RAM_binary.bin file.
Figure 4. STEVAL-ISB042V1 GUI Tx mode tab
Step 7. Verify the result by checking the operation mode.
If the label indicates Transmitter mode, the kit is ready and a receiver can be placed on the coil sur-
face.
Note: The coil used in the kit is a Qi/PMA receiver coil. Using this coil for transmitter mode leads to many compromis-
es and not all Qi certified receivers will work with this kit. For the Tx mode evaluation we recommend to use the
STEVAL-ISB043V1 wearable receiver kit as a receiver.
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Transmitter mode
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Figure 5. STEVAL-ISB042V1 GUI operation mode
1.4 STWLC33 NVM configuration
The STWLC33 NVM configuration is the same default configuration as in STWLC33 samples (see STWLC33 da-
tasheet).
1.4.1 Board overview
The STEVAL-ISB042V1 evaluation board default configuration has good performance.
The board features:
• STWLC33 evaluation board with Würth Elektronik dual mode coil (760308102207)
• Qi 1.2 compliant, supporting extended power profile: up to 15 W/10 V maximum output power
• Backward compatible with Qi baseline power profile: up to 5 W/5 V maximum output power
• PMA-SR1 (AirFuel inductive) compliant: 5 W/5.6 V maximum output power
• Transmitter function based on Qi protocol to charge wearable devices using the same Rx coil (up to 3 W
power)
• Total system efficiency up to 80%
• Configurable GPIOs for status indication
• I²C interface for communication with the host system
• Foreign object detection (FOD)
• Complete kit (IC, firmware)
• RoHS compliant
1.5 GUI: I²C register access
Most fields in the GUI application correspond to a single I²C register.(For further details, see STWLC33 datasheet
on www.st.com.)
Many registers are accessible in receiver or transmitter mode only.
Before accessing the registers, you must check the actual operation mode in the Sys_Op_Mode register.
1.5.1 Rx mode registers
The Registers tab contains three sub-tabs related to Rx mode I²C register controls.
Through the Interrupt registers sub-tab, you can monitor the following registers:
• Status_Rx
• INT_Rx
• INT_Enable_Rx
• INT_Clear_Rx
The GUI directly reads or writes the target register.
The Interrupt clear button first writes the INT_Clear_Rx register and then writes 1 in the Clr_Int bit in Com
register.
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STWLC33 NVM configuration
UM2289 - Rev 2 page 5/26
Figure 6. GUI Rx mode: Interrupt registers sub-tab
The Setup and measurement registers sub-tab controls registers and measurement values.
VOUT_set or ILIM_set modifications are immediate.
The default values are loaded automatically from NVM after wireless operating standard detection.
Important: Refer to 2 Configuration guidelines before changing the values.
The Power transfer termination consists of two steps:
• writing the EPT register;
• writing 1 in the S_EPT bit in Com register.
AD conversion results provide immediate VRECT and VOUT voltages as well as die temperature and output cur-
rent during power transfer.
RXID and PRMC_ID registers become active after wireless standard detection and provide an easy-to-read self-
ID (either Qi ID or PMA ID).
If the STWLC33 receiver is placed on a PMA pad that supports advertising, the advertising ID is captured and can
be read through PMA ADV registers.
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GUI: I²C register access
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Figure 7. GUI Rx mode: Setup and measurement registers sub-tab
The Qi – Proprietary packets sub-tab allows sending any Qi packet and (in Qi 1.2 only) receive the response
from the transmitter (both pattern type or data type responses are supported).
Figure 8. GUI Rx mode: Qi – Proprietary packets sub-tab
1.5.2 Tx mode registers
After entering the mode as described in 1.3 Transmitter mode, the TX mode tab lets you monitor the following
registers:
• Status_Tx
• INT_Tx
• INT_Enable_Tx
• INT_Clear_Tx
The GUI directly reads or writes the target register.
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GUI: I²C register access
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The Interrupt clear button first writes the INT_Clear_Tx register and then writes 1 in the Clr_Int bit in Com reg-
ister.
Tx frequency setup allows modifying the regulation control algorithm minimum and maximum frequency and the
starting ping frequency.
Note: The optimal ping frequency for the STEVAL-ISB042V1 evaluation board is approximately 130 kHz.
ASK demodulation thresholds parameter defines the ASK receiver sensitivity.
Figure 9. GUI Rx mode: TX mode tab
1.6 GUI: NVM configuration access
1.6.1 Qi NVM configuration
The Qi configuration tab contains manufacturer and device identifiers sent over the Qi protocol.
The tab contains also default values for the VOUT voltage, Input current limit and Interrupt enable registers
which can be configured separately for baseline power profile (BPP) operation and for extended power profile
(EPP). BPP values are loaded in the registers and subsequently updated if EPP is negotiated.
STWLC33 automatically terminates the power transfer if the load is below a certain threshold for a certain period
of time. By default, this feature is eliminated by setting the lowest possible current and the longest possible time.
Note: Qi specification does not require this feature.
To maintain the Qi foreign object detection feature accurate, you must provide the correct values representing the
coil parameters and the mechanical setup.
The evaluation kit contains components with the correct values to be used.
But, if, for example, the coil is replaced by another type of coil, you must update the following parameters:
•FOD_A
•FOD_B (different values for BPP and EPP)
•FOD_C (same value for BPP and EPP)
•Reference quality factor (for EPP only)
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GUI: NVM configuration access
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Figure 10. GUI: Qi configuration tab
1.6.2 PMA NVM configuration
The PMA configuration tab contains the RXID identifier sent over the PMA protocol.
The tab contains also default values for the VOUT voltage, Input current limit and Interrupt enable registers.
The PMA specification requires that the receiver automatically terminates the power transfer if the load is below a
certain threshold for a certain period of time.
If the power transfer termination is controlled by the host system, the STWLC33 feature can be eliminated (by
setting zero current and maximum possible time).
Figure 11. GUI: PMA configuration tab
1.6.3 Platform NVM configuration
This tab allows assigning GPIO functions related to Rx mode only.
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GUI: NVM configuration access
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In Tx mode, all the pins are inputs with no function.
In the STEVAL-ISB042V1 evaluation board, the LED diode (D6) is controlled by GPIO2 pin.
Figure 12. GUI: platform configuration tab
1.6.4 Generic load/save NVM access
The NVM tab allows the backup of the current NVM configuration into a file or loading a new one from a file.
Figure 13. GUI: NVM tab
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GUI: NVM configuration access
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