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User
’s Guide
BD57121MUF-EVK-001
© 2019 ROHM Co., Ltd.
No. 61UG042E Rev.001
JAN.2019
3. Operation of Wireless power transmission
(1) Put Qi compliant receiver directly on top of the Qi coil of the transmitter.
(2) When communication with the receiver is established, LED1 and LED2 light up in green according to the power profile of the
receiver.
(3) Connect the load.
4. Operation of NFC detection
(1) Place the NFC card / tag near the NFC antenna (approx. at 5 cm distance).
(2) LED3 lights on red during detection.
5. LED indicators
Tx Status
LED1(Green)
LED2(Green)
LED3(Red)
LED4(Green)
Disable (SW1=OFF)
OFF
OFF
OFF
OFF
Stand by(Idle)
OFF
OFF
OFF
ON
Qi BPP
(*1)
charging
ON
OFF
OFF
ON
Qi EPP
(*2)
charging
ON
ON
OFF
ON
During NFC detection
(*3)
OFF
OFF
ON
ON
During Error detection
(*4)
OFF
OFF
Blinking
ON
(*1) BPP (Baseline Power Profile): Capable wireless power supply up to 5W
(*2) EPP (Extended Power Profile): Capable wireless power supply up to 15W
(*3) LED3 also lights up when EVK protection circuit is activated.
Check whether there is abnormal heating on the board or overcurrent of the input power supply.
(*4) There are two types of error detection status.
・
Foreign Object Detection
Make sure that no foreign objects are caught between the transmitter and receiver.
In addition, due to position gap of the coil, foreign object may be detected. Therefore, please align the center of the
receiver coil with the center of Qi coil of the transmitter.
・
End of Power Transfer
The transmitter has stopped transferring power because it has received a stop signal from the receiver that is in use.
Please check using another receiver if the same phenomenon occurs.
