Rohm WPC Qi-compliant Wireless Power Series, BD57121MUF-M User Manual

WPC Qi-compliant Wireless Power Series

NFC-compatible Wireless Power Transmitter

for Automotive Applications

BD57121MUF-M Evaluation Board

BD57121MUF-EVK-001

Notice

＜High Voltage Safety Precautions＞

◇ Read all safety precautions before use

Please note that this document covers only the BD57121MUF-M evaluation board

(BD57121MUF-EVK-001) and its functions. For additional information, please refer to the datasheet.

To ensure safe operation, please carefully read all precautions before handling the evaluation board

Depending on the configuration of the board and voltages used,

Potentially lethal voltages may be generated.

Therefore, please make sure to read and observe all safety precautions described in the red box below.

Before Use

[1] Verify that the parts/components are not damaged or missing (i.e. due to the drops). [2] Check that there are no conductive foreign objects on the board. [3] Be careful when performing soldering on the module and/or evaluation board to ensure that solder

splash does not occur.

[4] Check that there is no condensation or water droplets on the circuit board.

During Use

[5] Be careful to not allow conductive objects to come into contact with the board. [6] Brief accidental contact or even bringing your hand close to the board may result in

discharge and lead to severe injury or death.

Therefore, DO NOT touch the board with your bare hands or bring them too close to the board.

In addition, as mentioned above please exercise extreme caution when using conductive tools such as tweezers and screwdrivers. [7] If used under conditions beyond its rated voltage, it may cause defects such as short-circuit or,

depending on the circumstances, explosion or other permanent damages.

[8] Be sure to wear insulated gloves when handling is required during operation.

After Use

[9] The ROHM Evaluation Board contains the circuits which store the high voltage. Since it stores the

charges even after the connected power circuits are cut, please discharge the electricity after using it, and please deal with it after confirming such electric discharge.

[10] Protect against electric shocks by wearing insulated gloves when handling.

This evaluation board is intended for use only in research and development facilities and should by handled only by qualified personnel familiar with all safety and operating procedures. We recommend carrying out operation in a safe environment that includes the use of high voltage signage at all entrances, safety interlocks, and protective glasses.

www.rohm.com HVA01E

No. 60AP001E Rev.001

2017.4

No. 61UG042E Rev.001

JAN.2019

User’s Guide

Parameter

Min

Typ

Max

Units

Conditions

Input voltage

11.0

12.0

13.0

Output voltage (receiver side)

12.0

Using BD57015GWL-EVK-002 Rx board

Output current (receiver side)

0 - 1.25

Using BD57015GWL-EVK-002 Rx board

Dark current

- 0 5

μA

SW1=OFF

Operating frequency (Wireless power)

127.8

kHz

WPC Qi-compliant Wireless Power Series

NFC-compatible Wireless Power Transmitter for Automotive Applications BD57121MUF-M E valuation Board

BD57121MUF-EVK-001

BD57121MUF-EVK-001 Evaluation Board is based on the BD57121MUF-M Automotive-grade wireless power transmitter IC. This board integrates the ST25R3914 NFC reader/writer IC from ST Microelectronics to detect the presence of any NFC cards or tags and to prevent damaging of the NFC antennae by the wireless power transfer system. Wireless power transfer is compliant with WPC Qi ver1.2.4 and can supply power up to 15 W (output in receiver). Detection and identification of NFC Type A, B, F and V are possible.

Features

・Compliance to WPC Qi ver1.2.4 ・Support of Multiple coils to increase charging area

(Qi MP-A13 coil type)

・Power control using fixed frequency and variable voltage ・NFC card / tag detection of Type A, B, F, V ・Housing size: 120 mm x 65 mm x 30 mm

Figure 1. BD57121MUF-EVK-001 Evaluation Board

Performance specification

These are only representative values, and they do not represent guaranteed values of the product characteristics. VIN = 12 V, unless otherwise specified.

1/13

User’s Guide

BD57121MUF-EVK-001

No. 61UG042E Rev.001

JAN.2019

Rectification Mod/DeMod

LDO

Qi packet Controller

Load

Predriver

Transmitter(Tx) : BD57121MUF-EVK-001

Qi Receiver(Rx)

Voltage

Current

Sensing

Power

BD57015GWL

Data

Half/Full

Bridge

Demodulator

Controller

Voltage

Current

Sensing

MCU

BD57121MUF-M

NFC Reader/Writer

NFC

Card/TAG

Data

NFC listener

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)

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.

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.

2/13

User’s Guide

BD57121MUF-EVK-001

No. 61UG042E Rev.001

JAN.2019

CAR Battery

LDO

Buck-Boost

DC/DC

5.4V/1A

Temperature

Sensing Circuits

(option)

Coil Selector

COIL1 COIL2 COIL3

Full Bridge

Qi Resonant Tank

ROHM WPT

BD57121MUF-M

ST Micro MCU

STM8AF

ST Micro

ST25R3914

DAC

V-

monitor

Pre-

drive

I-

monitor

FET FET

LDO

I2C

(3.3V)

SPI

(3.3V)

3.3V/0.15A

12V/3A

Enable SW

Load SW

VDDMCU

VDDA

PI filter

VDDA

VDDMCU

VBUS54

VDDMCU

VBUS54

VDDMCU

VBUS54

NFC Antenna

3. Block diagram of the transmitter

BD57121MUF-M operates with a 5.4 V power supply. NFC reader IC ST25R3914 operates with a main power supply of 5.4 V and a sub of 3.3 V. The STM8AF MCU operates with a main power supply of 3.3 V. The peripheral voltage of the MCU is 3.3 V. The MCU communicates with the BD57121MUF-M via I2C bus, and with the ST25R3914 via SPI bus.

BD57121MUF-M functions as the analog front-end for wireless power transfer that is compliant to Qi ver 1.2.4, and it includes a D / A converter for voltage control, a pre-driver for driving the inverter bridge, an analog sensing circuit, and a selector circuit for multiple coils.

ST25R3914 is a high-sensitivity and high-power NFC / HF analog front-end that supports ISO14443A / B, ISO15693, FeliCa™ and ISO 18092 (NFCIP-1) active P2P. This IC directly drives the NFC antenna. Please contact ST Microelectronics regarding details of this IC.

Figure 3. BD57121MUF-EVK-001 Block diagram

3/13

+ 11 hidden pages

Rohm WPC Qi-compliant Wireless Power Series, BD57121MUF-M User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual