Rohm BD868 0MUF-C Series User manual

BD868x0MUF-C
Camera PMIC EVK User Guide

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CONTENTS
List of Figures ..............................................................................................................3
List of Tables ...............................................................................................................3
1. Revision History ......................................................................................................5
Safety Precautions.........................................................................................................8
2. Overview ..............................................................................................................9
2.1. Purpose...........................................................................................................9
2.2. Acronyms & Abbreviations.....................................................................................9
2.3. EVK Part List.....................................................................................................9
3. Start Up................................................................................................................9
3.1. Boards Connection Overview ................................................................................ 10
3.2. GUI Software Installation .................................................................................... 10
3.3. PC Connection................................................................................................. 11
4. MB Description...................................................................................................... 11
4.1. Input Jumper Selection and Protection Circuit........................................................... 12
4.2. MCU interface ................................................................................................. 13
4.3. DB Interface ................................................................................................... 13
4.4. Level shifters .................................................................................................. 13
4.5. Reference Voltage for I/O signals and I2C signals ........................................................ 13
4.6. Outputs Acquisition Block ................................................................................... 13
5. DB Descripton....................................................................................................... 13
5.1. DB Plug-in ...................................................................................................... 14
5.2. Boards Powering .............................................................................................. 14
5.3. Load Connection .............................................................................................. 15
5.4. Board Access Points .......................................................................................... 15
5.5. Stand-alone functioning...................................................................................... 16
5.5.1. I2C and Warning/Reset Output Pull-up Jumper ........................................................ 16
6. Use of the GUI ...................................................................................................... 17
6.1. DB Selection ................................................................................................... 17
6.2. I2C communication confirmation ........................................................................... 18
6.2.1. Board Lost of Communication ............................................................................ 19
6.3. GUI Menus...................................................................................................... 19
6.3.1. Data / Connection tabs.................................................................................... 21
6.3.2. Registers tab ................................................................................................ 21

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6.3.3. Settings tab ................................................................................................. 21
6.4. GUI main area ................................................................................................. 22
6.4.1. Read register................................................................................................ 23
6.4.1.1. Write Register............................................................................................ 24
7. MB Schematic and BOM............................................................................................ 25
8. DB Schematic and BOM ............................................................................................ 31
LIST OF FIGURES
Figure 1: Boards connection overview................................................................................ 10
Figure 2: Executable file ................................................................................................ 11
Figure 3: EVK connection confirmation............................................................................... 11
Figure 4: MB Functional Blocks........................................................................................ 12
Figure 5: BD868x0-DB plugged into MB.............................................................................. 14
Figure 6: Input Voltage Reference Selection via J3................................................................. 15
Figure 7: Example of electronic load connected to VO3............................................................ 15
Figure 8: Setting to be check for stand-alone DB use .............................................................. 17
Figure 9: Board selection ............................................................................................... 17
Figure 10: Confirm board ............................................................................................... 18
Figure 11: GUI "DB BD868A0-EVK-302 Connection" tab .......................................................... 18
Figure 12: Communication information in main page of GUI tool.................................................. 19
Figure 13: GUI Lost of communication................................................................................ 19
Figure 14: Right side menus ........................................................................................... 20
Figure 15: Settings tab →Reconfigure product family.............................................................. 22
Figure 16: Read/write register buttons................................................................................ 23
Figure 17: Register value visualization................................................................................ 23
Figure 18: “Error” status read .......................................................................................... 24
Figure 19: Select write-protection bit.................................................................................. 24
Figure 20: Edit write-protection bit..................................................................................... 24
Figure 21: Write protection bit.......................................................................................... 24
Figure 22: "Write Fail" status when write bit not enabled........................................................... 25
Figure 23: "Error" status when no I2C communication is present.................................................. 25
Figure 24: BD868x0-EVK-302 schematics part 1 of 2 .............................................................. 33
Figure 25: BD868x0-EVK-302 schematics part 2 of 2 .............................................................. 34
LIST OF TABLES
Table 1: Acronyms & Abbreviations.....................................................................................9
Table 2: List of access points .......................................................................................... 16
Table 3: PMIC-MB-EVK-302 BOM .................................................................................... 26
Table 4: BD868x0-EVK-302 BOM..................................................................................... 31

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Table 5: BOM for BD868A0 vs. BD868B0............................................................................ 32

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1. REVISION HISTORY
Revision
Date
Description
001
13 July 2022
First edition

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Important Notice
This evaluation board is intended for product evaluation in a research and development context only
and is not intended for resale to end consumers and it is not authorized for end customer or household use.
This board may not comply with CE or similar standards (including, but not limited to the EMC directive) and
may not fulfil other requirements of the country it will be operated in by the user. The user shall ensure that
the evaluation board will be handled in a way that is compliant with all the standards and regulations in the
country it will be operated in.
The evaluation board provided here has only been subjected to functional testing under typical load
conditions. The design of this evaluation board is tested by ROHM only as described in the user guide for this
board. The design is not qualified in terms of safety requirements, manufacturing and operation over the entire
operating temperature range or lifetime.
This evaluation board may only be used by authorized personnel that is properly trained in
recognizing and dealing with the dangers of testing powered on equipment and generally
experimenting with powered on circuits. Ensure you review this user guide as it contains important safety
warnings. Take care that capacitors on the board have discharged fully before touching any part of the board.
Always place the evaluation board under appropriate covers, such as in a Perspex box, to protect against
accidental touching of high voltage parts BEFORE applying a voltage supply to the board.
To ensure safe operation, please carefully read all precautions before
handling the evaluation board
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] 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, permanent damages.
After Use
[8] 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.
[9] Protect against electric shocks by wearing insulated gloves when handling.

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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.

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SAFETY PRECAUTIONS
Caution: This evaluation board may only be used by authorized personnel that
is properly trained in recognizing and dealing with the dangers of testing high
voltage equipment and generally experimenting with high voltage circuits. This
board should only be used in a lab facility properly equipped for the safe testing
of power electronic systems at the relevant voltage levels. Failure to comply may
result in damage to equipment, personal injury or death.
Warning: This evaluation board contains DC bus capacitors which take time to
discharge after removal of the power supplies. Before working on the evaluation
board wait after deactivating all connected power supplies to ensure that the
capacitors have discharged.
Warning: Before disconnecting, connecting or reconnecting wires or
measurement probesto the board or before touching the board or performing any
manipulations on the board ensure that all external power is removed or
disconnected from the board and ensure the capacitors have discharged. Failure
to do so may result in damage to equipment, personal injury or death.
Caution: Some component surfaces on the evaluation board may become hot
during testing and remain hot for a certain time after turn-off. Take appropriate
measures while handling the board after use. Failure to do so may cause
personal injury.
Caution: Incorrect connection of power supplies or loads can damage the
board. Carefully review the information in this document.

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2. OVERVIEW
2.1. Purpose
The Camera PMIC EVK has the purpose to explore the functionality of the new camera PMIC
BD868x0MUF-C.
This user’s guide describes the content of the Camera PMIC EVK kit, that consists of:
•1x Daughter Board (DB) BD868x0-EVK-302 (PCB3047), in the future abbreviated as BD868x0-
DB, that is board under test (DUT)
•1x Mother Board PMIC-MB-EVK-302 Revision B (PCB3046), in the future abbreviated as PMIC-
MB-EVK, with already plugged-in MCU board (CY8CKIT-059)
•1x ROHM PMIC EVK GUI interface
2.2. Acronyms & Abbreviations
Acronym
Description
DB
Daughter Board
MB
Mother Board
GUI
Graphical User Interface
PMIC
Power Management Integrated Circuit
EVK
Evaluation Kit
DUT
Device Under Test
PMIC-MB-EVK
Mother board EVK
BD868x0-DB
Daughter board
BOM
Bill of Material
Table 1: Acronyms & Abbreviations
2.3. EVK Part List
The EVK box consist of:
▪1x PMIC-MB-EVK
▪1x BD868x0-DB
▪1x USB –Micro-USB cable
▪1x USB stick including software program ROHM PMIC EVK
3. START UP
Some external hardware is needed for the evaluation of the BD868x0-DB. In particular:

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▪A power supply, able to supply voltage in the range 4.0V to 18V and power capability of at least
15W
▪An electronic load, able to supply more than 2A
3.1. Boards Connection Overview
Figure 1 shows an overview of the board connection, highlighting how to connect external hardware for
evaluation of our Camera PMIC EVK.
For detailed steps, please refer to the next paragraphs.
Figure 1: Boards connection overview
3.2. GUI Software Installation
To run and test the functionality of BD868x0-DB via a computer, the dedicated GUI need to be installed.
Download the latest version via our website or use the USB stick provided with the EVK kit and extract
the .zip file in your own computer folder. Then run the executable file ROHM_EVK.exe to start the GUI.
USB cable
(micro-USB)
RESET
C
O
N
S
O
L
E
F
A
I
L
LocalDirectorSERIES
O
V
E
R
GND
VIN
Power Supply
Electronic
Load
Load
connection

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Figure 2: Executable file
3.3. PC Connection
Communication between GUI software and EVK hardware is achieved by inserting a micro-USB cable
into the CY8CKIT-059 plug-in board that is mounted on the MB (see Figure 1 and Figure 4).
Once the communication between GUI and CY8CKIT-059 plug-in board is established, the “EVK
connection” box of the GUI software will turn to yellow. The initialization steps are also shown in the “Log” tab
at the bottom (see figure below).
Figure 3: EVK connection confirmation
4. MB DESCRIPTION
The Mother board can be used with a variety of different DBs that are developed for different ROHM ICs.
It acts as an interface between the DBs, PC and external equipment.
Functional blocks of the board are shown below:

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Figure 4: MB Functional Blocks
For schematic details and BOM please refer to paragraph 7.
4.1. Input Jumper Selection and Protection Circuit
Different DBs can have different input voltage ranges. The input voltage is digitized and displayed in the
GUI. To get a better accuracy of the displayed input voltage jumper J3 must be set appropriately according to
the current input voltage range:
•2.7 –5.5V
•7.4 –55V
These two paths have different voltage divider circuits. They divide the value of the sensed input voltage
such that it remains below the maximum admissible value for the buffered sense circuit.
To avoid destruction of the sense circuit in case the input voltage is beyond the selected range, a circuit
protection is onboard to clamp the scaled-down input buffer voltage to a maximum of 4V.
Please note that if J3 is placed in the wrong position the input voltage value shown by the GUI will be
incorrect.
J7
J8
I/O signals
and I2C
Reference
Voltage
I2C Level
Shifters
Micro USB
Input Jumper
Selection and
Protection
Circuit
J3
GND
+VIN
DB
Interface
area
CN7
CN8
CN9
Output
Acquisition
Block
I/O signal
Level
Shifters
CY8CKIT-059
plug-in board
CN1
CN2
CN3

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4.2. MCU interface
A CY8CKIT-059 plug-in board is included in the MB set. It connects via 3 connectors CN1, CN2 and CN3
(Figure 4 –under CY8CKIT-059 plug-in board) to the MB. Its purpose is to manage the communication
between the GUI, MB and DB.
4.3. DB Interface
The DB is plugged into three connectors (CN7, CN8 and CN9).
CN7 carries all power signals (VIN and VOx), CN8 contains all the PMIC signal lines, whereas CN9 is
only a fool proof connector to prevent an erroneous DB plug-in orientation.
4.4. Level shifters
The logic signals of the CY8CKIT-059 plug-in board and the MB could have different voltage levels. To
adapt the levels three level shifters are foreseen. Two of them, U4 and U6, take care of the I/O signals while
U3 handles I2C signals.
4.5. Reference Voltage for I/O signals and I2C signals
Different DBs could lead to different required reference levels for I/O signals (VGPIO) or I2C (VI2C). For
this reason, the jumper connectors J7 and J8 (Figure 4) set the voltage reference of VGPIO and VI2C to any
chosen output voltage VOx that is provided by the DB or by the local LDO 1.8V reference.
The default setting for both jumpers J7 and J8 is between pin #31 and #32, so the local LDO 1.8V is set
for both VGPIO and VI2O. For any additional information on the details of other pin lines, please refer to the
schematic in paragraph Fehler! Verweisquelle konnte nicht gefunden werden..
4.6. Outputs Acquisition Block
The MB input voltage (that is also the DB input voltage) and all outputs of the DB are sensed and
transferred to the CY8CKIT-059 plug-in board by a multiplexer followed by a buffer stage.
5. DB DESCRIPTON
The BD868x0-DB has been designed to provide an easy tool to test the functionality of new camera
PMICs BD868A0 and BD868B0.
The core design of the application is compact. However, the large board size and multiple test points
allow a quick and easy evaluation.
The BD868A0/B0 contains 3 buck regulators and 1 LDO output as well as an internal linear regulator.
The schematics and the layout are designed with some unmounted capacitors both at the input and at
the outputs. This provides more flexibility for the input- and output buffering.

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5.1. DB Plug-in
Unless already put in place, before starting the board evaluation, BD868x0-DB needs to be plugged-in
into MB. Please take care to plug-in correctly in order not to destroy the board itself.
Board orientation is given by connector CN3 (see Figure 5).
Figure 5: BD868x0-DB plugged into MB
5.2. Boards Powering
Connect an input voltage of 4V to 18V to the banana jacks on the MB. BD868x0-DB is powered via MB
banana jacks through CN1 (see Figure 5).
IMPORTANTE NOTE:
Before applying power to the MB, please select the current input voltage range according to the
plugged-in DB. In case of BD868x0-DB, please set jumper J3 on MB (see Figure 6) between pin #3 and
#4 for range 7.4 –55V.
DB
CN3
CN1
MB
CN2

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Figure 6: Input Voltage Reference Selection via J3
To power ON the EVK set, an external power supply needs to be connected to the banana jacks (see
Figure 1 and Figure 4) that mounted on the MB. Check that the input voltage is in accordance with the range
reported in BD868x0 datasheet (please take care of the correct orientation of the inputs since no reverse
protection is foreseen on the MB).
5.3. Load Connection
Each output can be tested in light load or in full load.
An external load can be connected to the access points listed in the Table 2 according to the maximum
value, as indicated in the datasheet. As an example, the picture below shows how an electronic load should
be connected to output 3.
Figure 7: Example of electronic load connected to VO3
5.4. Board Access Points
The EVK board has many access points to ease measurements of PMIC outputs and other signals.
Below is a table that summarize them:
Access point
Description

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VO1
Test point for Output 1
VO2
Test point for Output 2
VO3
Test point for Output 3
VO4
Test point for Output 4
SDA
Test point for serial interface data
SCL
Test point for serial interface clock
WAROUTB
Test point for Warning output
RSTOUTB
Test point for Reset output
VIN
Test point for board Input Voltage
GND
Test point for Ground
Table 2: List of access points
5.5. Stand-alone functioning
BD868x0-DB has beendesigned to be usedin combination with the PMIC-MB-EVK andthe GUI interface.
However, the DB can also be operated in stand-alone mode without the GUI software.
In this case, an input voltage must be applied either to CN1 (positive voltage VIN connected to pin #1 to
#10 and GND to pin #31 to #40) or to the related access points VIN and GND.
The jumper at CN5 must be put on position 5-6.
5.5.1.I2C and Warning/Reset Output Pull-up Jumper
In normal operation (i.e., when plugged into the MB), the pull-up voltage for I2C communication and
warning/reset outputs is given by the level shifter installed on the MB. In this case, the jumper of CN5 must
be removed.
However, in case of stand-alone use or in case of communication problems between DB and MB, a
jumper on connector CN5 can be placed to have a different voltage reference.
More precisely, there are 3 possible pull-up voltages depending where the jumper is placed on connector
CN5:
- 1.8V LDO from MB (if connected) if jumper is placed between pin #1 and pin #2
- 1.5V from internal regulator of BD868x0 if jumper is placed between pin #3 and pin #4
- 1.8V from output VO3 of DB if jumper is placed between pin #5 and pin #6

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Figure 8: Setting to be check for stand-alone DB use
6. USE OF THE GUI
6.1. DB Selection
After applying the power, as described in the previous paragraphs, select the board name “BD868A0-
EVK-302 DS2 (CRC ON, RnD)” in the drop-down menu present on the top right side in the main page of the
GUI. Alternatively, you could also choose the board in the tab “Board” on the top-left side of the GUI.
Figure 9: Board selection
Once done, you need to press the “Confirm board” button. Now the field “EVK connection” turns green.

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Figure 10: Confirm board
Board matching can also be verified in the “DB BD868A0-EVK-302 Connection” tab:
Figure 11: GUI "DB BD868A0-EVK-302 Connection" tab
6.2. I2C communication confirmation
After selection of the board name and pressing of the “Confirm board” button, the confirmation of the
correct functioning of the board is given in the “Connection status” box on the top right side of the GUI.
A green “EVK Ready” will appear as depicted in Figure 12.
Input & output voltages are also simultaneously displayed in the related cells.

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Figure 12: Communication information in main page of GUI tool
6.2.1. Board Lost of Communication
ProblemswithI2C communication duringtesting operation will not generate an automaticfailure message.
However, the status turns to “Error” after pressing any read/write button.
Figure 13: GUI Lost of communication
In this state the voltage values will not be updated even if the voltage box keeps showing the last value
before the loss of communication.
Also, no access to PMIC registers is possible.
6.3. GUI Menus
In the top left corner of the GUI menu a “Help” menu provides information regarding revision, version and
configuration of the CY8CKIT-059 plug-in board and the GUI software.
On the right side is an area containing the following elements:
▪“EVK connection” box that indicates the status of the communication between GUI and CY8CKIT-
059 plug-in board that is plugged-in into the MB
▪Drop down menu for EVK selection
▪“Confirm board” button that needs to be pressed, once the appropriate EVK is selected from the
drop-down menu
▪Status box, to show warnings and reset outputs. Below them is a box “ADC” indicating the input
voltage as well as all output voltages.

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Figure 14: Right side menus
The GUI contains 9 main tabs:
▪File (allows to exit GUI software)
▪Data
▪Connection
▪Registers
▪Settings
▪Stream (disabled for BD868x0 GUI)
▪Board (see chapter 6.1)
▪View (enables/disables additional views)
▪Help
The following sub-chapters describe some of them.