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User
’s Guide
BD57121MUF-EVK-001
© 2019 ROHM Co., Ltd.
No. 61UG042E Rev.001
JAN.2019
Evaluation Board
1. System configuration for wireless power transfer and NFC
Wireless power transfer system consists of a two-way power transmission and communication system using a transmitter and a
receiver, and the NFC system also communicates between the reader (= transmitter) and the listener. A single Microcontroller (MCU)
controls both wireless power transmission and NFC reader, so it is possible to have seamless operation between each other.
Rectification
Mod/DeMod
LDO
Qi packet
Controller
Load
Predriver
Transmitter(Tx) : BD57121MUF-EVK-001
Qi Receiver(Rx)
Voltage
&
Current
Sensing
Power
BD57015GWL
Data
Data
Half/Full
Bridge
Demodulator
Tx
Controller
Voltage
&
Current
Sensing
MCU
BD57121MUF-M
NFC Reader/Writer
NFC
Card/TAG
Data
Data
NFC listener
Figure 2. System configuration for wireless power transfer and NFC
2. Key components
The purpose of this EVK is to evaluate and verify key components needed for wireless power transfer and NFC detection. For more
information, refer to the Web site for each product.
Manufacturer
Product
Part Number
ROHM Semiconductor
Wireless Power Transmitter IC
BD57121MUF-M
ROHM Semiconductor
Low Dropout Regulator IC
BD00C0AWFP-C
Infineon Technologies
Buck-Boost DC/DC controller IC
TLD5190QV
ST Microelectronics
NFC Reader/Writer IC
ST25R3914
ST Microelectronics
Microcontroller
STM8AF62A8
TDK
Qi Transmitter Coil
WT1005690-12F2-A6-G1
ROHM Semiconductor
NFC Antenna
- (PCB pattern)
