ROHM BR34E02NUX-W

Memory for Plug & Play
DDR/DDR2
(For memory module) SPD Memory
BR34E02FVT-W, BR34E02NUX-W
No.09002EAT03
●Description
BR34E02FVT-W is 256×8 bit Electrically Erasable PROM (Based on Serial Presence Detect)
●Features
1) 256×8 bit architecture serial EEPROM
2) Wide operating voltage range: 1.7V-3.6V
3) Two-wire serial interface
4) High reliability connection using Au pads and Au wires
5) Self-Timed Erase and Write Cycle
6) Page Write Function (16byte)
7) Write Protect Mode
Settable Reversible Write Protect Function: 00h-7Fh
Write Protect 1 (Onetime Rom)
: 00h-7Fh
Write Protect 2 (Hardwire WP PIN)
: 00h-FFh
8) Low Power consumption
Write
(at 1.7V ) :
0.4mA (typ.)
Read
(at 1.7V ) :
0.1mA(typ.)
Standby ( at 1.7V ) :
0.1µA(typ.)
9) DATA security
Write protect feature (WP pin)
Inhibit to WRITE at low VCC
10) Compact package: TSSOP-B8, VSON008X2030
11) High reliability fine pattern CMOS technology
12) Rewriting possible up to 1,000,000 times
13) Data retention: 40 years
14) Noise reduction Filtered inputs in SCL / SDA
15) Initial data FFh at all addresses
●BR34E02-W Series
Capacity
2Kbit
Bit format
256X8
Type
BR34E02-W
●Absolute Maximum Ratings (Ta=25℃)
Parameter
Supply Voltage
Power Dissipation
Storage Temperature
Operating Temperature
Terminal Voltage (A0)
Terminal Voltage (etcetera)
Power Source Voltage
1.7V～3.6V
Symbol
VCC
TSSOP-B8
●
Rating
-0.3～+6.5
330(BR34E02FVT-W)
300(BR34E02NUX-W)
-65～+125
-40～+85
-0.3～10.0
-0.3～VCC+0.3
Pd
Tstg
Topr
-
*1
*2
VSON008X2030
●
Unit
V
mW
℃
℃
V
V
* Reduce by 3.3mW(*1), 3.0 mW(*2)/C over 25C
●Recommended operating conditions
Parameter
Supply Voltage
Input Voltage
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© 2009 ROHM Co., Ltd. All rights reserved.
Symbol
VCC
ＶIN
Rating
1.7～3.6
0～VCC
1/18
Unit
V
V
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Memory cell characteristics(Ta=25℃, VCC=1.7V～3.6V)
Specification
Parameter
Min.
Typ.
Write / Erase Cycle *1
1,000,000
*1
Data Retention
40
-
Max.
-
Unit
Cycles
Years
*1:Not 100% TESTED
●Electrical characteristics - DC(Unless otherwise specified Ta=-40℃～+85℃, VCC=1.7V～3.6V)
Specification
Parameter
Symbol
Unit
Test Condition
Min.
Typ.
Max.
"H" Input Voltage
VIH1
0.7 VCC
Vcc+0.3
V
"L" Input Voltage
VIL1
0.3 VCC
V
"L" Output Voltage 1
VOL1
-0.3
0.4
V IOL=2.1mA，2.5V≦VCC≦3.6V(SDA)
"L" Output Voltage 2
VOL2
0.2
V IOL=0.7mA，1.7V≦VCC＜2.5V(SDA)
Input Leakage Current 1
ILI1
-1
1
µA VIN=0V～VCC(A0,A1,A2,SCL)
Input Leakage Current 2
ILI2
-1
15
µA VIN=0V～VCC(WP)
Input Leakage Current 3
ILI3
-1
20
µA VIN=VHV(A0)
Output Leakage Current
ILO
-1
1
µA VOUT=0V～VCC
VCC=1.7V,fSCL=100kHz，tWR=5ms
Byte Write
ICC1
1.0
mA
Page Write
Write Protect
VCC =3.6V,fSCL=100kHz, tWR=5ms
Byte Write
Operating Current
ICC2
3.0
mA
Page Write
Write Protect
VCC =3.6V,fSCL=100kHz
Random Read
ICC3
0.5
mA
Current Read
Sequential Read
VCC =3.6V,SDA,SCL= VCC
Standby Current
ISB
2.0
µA
A0,A1,A2=GND,WP=GND
A0 HV Voltage
VHV
7
10
V VHV-Vcc≧4.8V
○Note: This IC is not designed to be radiation-resistant.
●lectrical characteristics - AC(Unless otherwise specified Ta=-40℃～+85℃, VCC =1.7V～3.6V)
STANDARD-MODE
FAST-MODE
1.7V≦VCC≦5.5V
2.5V≦VCC≦5.5V
Parameter
Symbol
Min.
Typ.
Max.
Min.
Typ.
Max.
Clock Frequency
fSCL
400
100
Data Clock High Period
tHIGH
0.6
4.0
Data Clock Low Period
tLOW
1.2
4.7
SDA and SCL Rise Time *1
tR
0.3
1.0
SDA and SCL Fall Time *1
tF
0.3
0.3
Start Condition Hold Time
tHD:STA
0.6
4.0
Start Condition Setup Time
tSU:STA
0.6
4.7
Input Data Hold Time
tHD:DAT
0
0
Input Data Setup Time
tSU:DAT
100
250
Output Data Delay Time
tPD
0.1
0.9
0.1
3.5
Output Data Hold Time
tDH
0.1
0.1
Stop Condition Setup Time
tSU:STO
0.6
4.0
Bus Free Time
tBUF
1.2
4.7
Write Cycle Time
tWR
5
5
Noise Spike Width (SDA
tI
0.1
0.1
and SCL)
WP Hold Time
tHD：WP
0
0
WP Setup Time
tSU：WP
0.1
0.1
WP High Period
tHIGH：WP
1.0
1.0
-
Unit
kHz
µs
µs
µs
µs
µs
µs
ns
ns
µs
µs
µs
µs
ms
µs
ns
µs
µs
*1：Not 100％ TESTED
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© 2009 ROHM Co., Ltd. All rights reserved.
2/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
■Fast / Standard Modes
Fast mode and Standard mode differ only in operation frequency. Operations performed at 100kHz are considered in
"Standard-mode", while those conducted at 400kHz are in "Fast-mode".
Please note that these clock frequencies are maximum values. At lower power supply voltage it is difficult to operate at high speeds.
The EEPROM can operate at 400kHz, between 2.5V and 3.6V, and at 100kHz from 1.7V-2.5V.
●Synchronous Data Timing
tR
tF
tHIGH
SCL
SCL
tSU:DAT tLOW
tHD:STA
tHD:DAT
tSU:STA
SDA
(IN)
tBUF
tPD
tHD:STA
tSU:STO
SDA
tDH
SDA
(OUT)
START BIT
STOP BIT
Fig.1-(b) Start/Stop Bit Timing
Fig.1-(a) Synchronous Data Timing
○SDA data is latched into the chip at the rising edge ○
of SCL clock.
○Output data toggles at the falling edge of SCL clock.
SCL
SCL
DATA(1)
SDA
SDA
D0
D1
D0
DATA(n)
ACK
ACK
ｔWR
ACK
tWR
WRITE DATA(n)
STOP CONDITION
Stop Condition
WP
START CONDITION
tSU：WP
ｔHD：WP
Fig.1-(d) WP Timing Of The Write Operation
Fig.1-(c) Write Cycle Timing
SCL
DATA(n)
DATA(1)
SDA
D1
D0
ACK
ACK
tHIGH:WP
tWR
WP
Fig.1-(e) WP Timing Of The Write Cancel Operation
○For WRITE operation, WP must be "Low" from the rising edge of the
clock (which takes in D0 of first byte) until the end of tWR. (See
Fig.1-(d) ) During this period, WRITE operation can be canceled by
setting WP "High".（See Fig.1-(e)）
○When WP is set to "High" during tWR, WRITE operation is
immediately ceased, making the data unreliable. It must then be
re-written.
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© 2009 ROHM Co., Ltd. All rights reserved.
3/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Block diagram
PROTECT_MEMORY_ARRY
A0 1
8 VCC
2Kbit_MEMORY_ARRY
8bit
8bit
ADDRESS
DECODER
A1 2
8bit
SLAVE , WORD
ADDRESS
GS
START
A2 3
DATA
REGISTE
7 WP
STOP
6 SCL
CONTOROL LOGIC
ACK
GND 4
HIGH VOLTAGE
5 SDA
VCC LEVEL
Fig.2 Blo
●Pinout diagram and description
A0 1
A1 2
A2 3
Pin Name
Input/Output
VCC
-
Power Supply
GND
-
Ground 0V
A0,A1,A2
IN
Slave Address Set.
SCL
IN
Serial Clock Input
SDA
IN / OUT
WP
IN
8 VCC
BR34E02FVT-W
BR34E02NUX-W
7 WP
Functions
6 SCL
Serial Data Input, Serial Data Output
5 SDA
GND 4
*1
Slave and Word Address,
*2
Write Protect Input
*1 Open drain output requires a pull-up resistor.
*2 WP Pin has a Pull-Down resistor. Please leave unconnected or
connect to GND when not in use.
Fig.3 Pin Configuration
●Electrical characteristics curves
The following characteristic data are typ. value.
6
1
5
0.8
SPEC
3
Ta=85℃
Ta=-40℃
Ta=25℃
2
Ta=85℃
Ta=-40℃
Ta=25℃
0.6
SPEC
0.4
Ta=85℃
Ta=25℃
0.2
1
SPEC
0
0
Fig.4 "H" Input Voltage VIH
(A0,A1,A2,SCL,SDA,WP)
VOL1[V]
VIL1,2[V]
4
1
2
3
Ta=-40℃
0
4
0
1
2
3
4
VCC[V]
IOL1[mA]
Fig.5 "L" Input Voltage VIL
(A0,A1,A2,SCL,SDA,WP)
Fig.6 "L" Output Voltage VOL1-IOL1
(VCC=2.5V)
1
1.2
16
SPEC
SPEC
1
0.8
12
Ta=85℃
0.4
0.6
8
0.4
Ta=25℃
SPEC
ILI2[μA]
ILI1[ μA]
VOL2[V]
0.8
0.6
Ta=85℃
Ta=25℃
Ta=-40℃
4
0.2
Ta=85℃
Ta=25℃
Ta=-40℃
0.2
Ta=-40℃
0
0
0
1
2
3
4
IOL2[mA]
Fig.7 "L" Output Voltage VOL2-IOL2
(VCC=1.7V)
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© 2009 ROHM Co., Ltd. All rights reserved.
0
0
1
2
3
4
VCC[V]
Fig.8 Input Leakage Current ILI1
(A0,A1,A2,SCL,SDA)
4/18
0
1
2
3
4
VCC[V]
Fig.9 Input Leakage Current ILI2
(WP)
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
0.6
2.5
SPEC1
3
2.5
1.5
SPEC2
1
fSCL=100kHz
DATA=AAh
0.3
1.5
1
Ta=85℃
0.2
Ta=25℃
Ta=85℃
Ta=-40℃
0.5
SPEC
2
0.4
ｆSCL=400kHz(VCC≧2.5V)
fSCL=100kHz(1.7V≦Vcc＜２．５V)
DATA=AA
2
ICC3[mA]
ICC1,2[mA]
SPEC
0.5
ISB[μA]
3.5
Ta=25℃
0.5
0.1
Ta=40℃
0
0
0
0
1
2
3
0
4
1
2
3
0
4
VCC[V]
SPEC2
4
4
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
2
10
1
2
3
1
0
0
4
1
2
3
4
0
SPEC1,2
4
1
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC1
0
3
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
2
Ta=-40℃
Ta=25℃
Ta=85℃
1
0
tHD:DAT(HIGH)[μs]
tSU:STA[μs]
2
SPEC1
1
2
3
4
0
1
VCC[V]
2
=85℃
Ta=25℃
Ta=-40℃
-50
-100
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
-150
0
0
4
50
SPEC2
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
3
Fig.15 Data Clock Low Period tLow
5
SPEC2
4
2
VCC[V]
Fig.14 Data Clock High Period tHigh
5
3
1
VCC[V]
VCC[V]
Fig.13 Clock Frequency fSCL
Ta=85℃
Ta=25℃
Ta=-40℃
SPEC1
0
1
tHD:STA[μs]
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
2
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC1
1
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
3
tLOW[μs]
3
tHIGH[μs]
fSCL[kHz]
1000
SPEC1
4
5
SPEC2
SPEC2
3
Fig.12 Standby Current ISB
5
Ta=85℃
Ta=25℃
Ta=-40℃
2
VCC[V]
Fig.11 Read Operating Current ICC3
(fSCL=400kHz)
10000
0
1
VCC[V]
Fig.10 Write Operating Current ICC1,2
(fSCL=100kHz,400kHz)
100
Ta=85℃
Ta=25℃
Ta=-40℃
3
-200
4
0
VCC[V]
1
2
3
4
VCC[V]
Fig.16 Start Condition Hold Time
tHD:STA
Fig.17 Start Condition Setup Time
tSU:STA
FiagmDag.18 ck DiTarata
HoldimtHD:DAT(High)
300
50
300
SPEC2
200
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
-50
-100
Ta=85℃
-150
1
Ta=85℃
SPEC1
Ta=25℃
Ta=-40℃
0
2
3
4
VCC[V]
Fig.19 Data Hold Time
tHD:DAT(LOW)
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© 2009 ROHM Co., Ltd. All rights reserved.
SPEC1
100
Ta=85℃
0
Ta=25℃
-100
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
Ta=-40℃
-200
0
100
-100
Ta=25℃
SPEC2
200
tSU:DAT(LOW)[ns]
SPEC1,2
tSU:DAT(HIGH)[ns]
tHD:DAT(LOW)[μs]
0
Ta=-40℃
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
-200
-200
0
1
2
3
4
VCC[V]
Fig.20 Input Data Setup Time
tSU:DAT(HIGH)
5/18
0
1
2
3
4
VCC[V]
Fig.21 Input Data Setup Time
tSU:DAT(LOW)
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
4
4
5
SPEC2
SPEC2
3
tDH[μs]
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
2
Ta=85℃
Ta=25℃
Ta=-40℃
SPEC1
1
SPEC2
0
2
1
2
3
VCC[V]
Fig.22 Output Data Delay Time
tPD
2
Ta=85℃
Ta=25℃
Ta=-40
℃
SPEC1
3
0
4
1
2
3
4
VCC[V]
Fig.23 Output Data Hold Time
tDH
Fig.24 Stop Condition Setup Time
tSU:STO
0.6
6
SPEC2
SPEC1,2
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0.5
5
4
tWR[ms]
3
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
2
SPEC1
3
Ta=85℃
2
3
4
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0
1
VCC[V]
2
0
3
0
4
0.6
Ta=25℃
Ta=-40℃
Ta=25℃
0.3
Ta=85℃
0.2
Ta=85℃
0.1
SPEC1,2
0
1
2
3
4
0.4
Ta=-40℃
Ta=25℃
0.3
Ta=85℃
0.2
SPEC1,2
0
0
1
2
VCC[V]
3
0
4
1
2
3
4
VCC[V]
VCC[V]
Fig.29 Noise Spike Width
tI(SDA H)
Fig.28 Noise Spike Width
tI(SCL L)
4
0.1
SPEC1,2
0
0
3
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0.5
tI(SDA L)[μs]
tI(SDA H)[μs]
Ta=-40℃
0.4
2
Fig.27 Noise Spike Width
tI(SCL H)
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0.5
0.4
0.1
1
VCC[V]
0.6
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0.2
Ta=85℃
0.2
Fig.26 Write Cycle Time
tWR
0.6
0.3
0.3
VCC[V]
Fig.25 Bus Free Time
tBUF
0.5
Ta=25℃
SPEC1,2
0
1
0.4
0.1
1
Ta=25℃
Ta=-40℃
0
0
Ta=25℃
2
Ta=85℃
1
Ta=-40℃
tI(SCL H)[μs]
Ta=-40℃
4
tBUF[μs]
2
VCC[V]
5
tI(SCL L)[μs]
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0
1
4
3
1
SPEC1
0
1
Ta=85℃
Ta=25℃
Ta=-40℃
SPEC2
0
SPEC1
0
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
tSU:STO[μs]
3
tPD[μs]
4
Fig.30 Noise Spike Width
tI(SDA L)
1.2
0.2
SPEC1,2
SPEC1,2
1
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
-0.2
Ta=85℃
Ta=25℃
tHIGH:WP[μs]
tSU:WP[μs]
0
0.8
SPEC1:FAST-MODE
SPEC2:STANDARD-MODE
0.6
0.4
-0.4
Ta=-40℃
Ta=25℃
Ta=85℃
0.2
Ta=-40℃
-0.6
0
0
1
2
3
4
VCC[V]
Fig.31 WP Setup Time
tSU:WP
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© 2009 ROHM Co., Ltd. All rights reserved.
0
1
2
3
4
VCC[V]
Fig.32 WP High Period
tHigh:WP
6/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
2
●Data transfer on the I C BUS
○Data transfer on the I2C BUS
The BUS is considered to be busy after the START condition and free a certain time after the STOP condition.
Every SDA byte must be 8-bits long and requires an ACKNOWLEDGE signal after each byte. The devices have Master
and Slave configurations. The Master device initiates and ends data transfer on the BUS and generates the clock signals
in order to permit transfer.
The EEPROM in a slave configuration is controlled by a unique address. Devices transmitting data are referred to as the
Transmitter. The devices receiving the data are called Receiver.
○START Condition (Recognition of the START bit)
・All commands are proceeded by the start condition, which is a High to Low transition of SDA when SCL is High.
・The device continuously monitors the SDA and SCL lines for the start condition and will not respond to any command
until this condition has been met. (See Fig.1-(b) START/STOP Bit Timing)
○STOP Condition (Recognition of STOP bit)
・All communications must be terminated by a stop condition, which is a Low to High transition of SDA when SCL is High.
(See Fig.1-(b) START/STOP Bit Timing)
○Write Protect By Soft Ware
・Set Write Protect command and permanent set Write Protect command set data of 00h～7Fh in 256 words write
protection block. Clear Write Protect command can cancel write protection block which is set by set write Protect
command. Cancel of write protection block which is set by permanent set Write Protect command at once is
impossibility. When these commands are carried out, WP pin must be OPEN or GND.
○Acknowledge
・Acknowledge is a software used to indicate successful data transfers. The Transmitter device will release the BUS after
transmitting eight bits. When inputting the slave address during write or read operation, the Transmitter is the µ-COM.
When outputting the data during read operation, the Transmitter is the EEPROM.
・During the ninth clock cycle the Receiver will pull the SDA line Low to verify that the eight bits of data have been
received. (When inputting the slave address during write or read operation, EEPROM is the receiver. When outputting
the data during read operation the receiver is the µ-COM.)
・The device will respond with an Acknowledge after recognition of a START condition and its slave address (8bit).
・In WRITE mode, the device will respond with an Acknowledge after the receipt of each subsequent 8-bit word (word
address and write data).
・In READ mode, the device will transmit eight bits of data, release the SDA line, and monitor the line for an Acknowledge.
・If an Acknowledge is detected and no STOP condition is generated by the Master, the device will continue to transmit
the data. If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP
condition before returning to standby mode.
○Device Addressing
・Following a START condition, the Master outputs the Slave address to be accessed. The most significant four bits of the
slave address are the “device type indentifier.” For this EEPROM it is “1010.
” (For WP register access this code is "0110".)
・The next three bits identify the specified device on the BUS (device address).
The device address is defined by the state of the A0,A1 and A2 input pins. This IC works only when the device address
input from the SDA pin corresponds to the status of the A0,A1 and A2 input pins. Using this address scheme allows up
to eight devices to be connected to the BUS.
・The last bit of the stream (R/W…READ/WRITE) determines the operation to be performed.
R/W=0
R/W=1
Slave Address Set Pin
A2
A2
GND
GND
A1
A1
GND
Vcc
A0
A0
VHV
VHV
････
････
WRITE (including word address input of Random Read)
READ
Device Type
1010
0110
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Device Address
A2
A2
0
0
A1
A1
0
1
A0
A0
1
1
Read Write
Mode
―
R/W
―
R/W
―
R/W
―
R/W
7/18
Access Area
2kbit Access to Memory
Access to Permanent Set Write Protect Memory
Access to Set Write Protect Memroy
Access to Clear Write Protect MEmory
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
○WRITE PROTECT PIN(WP)
When WP pin set to Vcc (H level), write protect is set for 256 words (all address). When WP pin set to GND (L level),
it is enable to write 256 words (all address).
If permanent protection is done by Write Protect command, lower half area (00～7Fh address) is inhibited writing
regardless of WP pin state.
WP pin has a Pull-Down resistor. Please be left unconnected or connect to GND when WP feature is not in use.
○Confirm Write Protect Resistor by ACK
According to state of Write Protect Resistor, ACK is as follows.
State of Write
WP Input
Input Command
ACK
Protect Registor
PSWP, SWP, CWP No ACK
In case,
Page or Byte Write
protect by PSWP
ACK
(00～7Fh)
SWP
No ACK
CWP
ACK
0
PSWP
ACK
Page or Byte Write
ACK
In case,
(00～7Fh)
protect by SWP
SWP
No ACK
CSP
ACK
1
PSWP
ACK
Page or Byte Write
ACK
PSWP, SWP, CWP
ACK
0
Page or Byte Write
ACK
In case,
Not protect
PSWP, SWP, CWP
ACK
1
Page or Byte Write
ACK
Address
ACK
-
No ACK
WA7～WA0
ACK
-
No ACK
ACK
ACK
WA7～WA0
ACK
WA7～WA0
WA7～WA0
WA7～WA0
Write
Cycle(tWR)
No ACK
No
Data
ACK
D7～D0 No ACK
-
No
No ACK
ACK
ACK
No
Yes
Yes
D7～D0 No ACK
No
No ACK
No ACK
ACK
No ACK
ACK
No ACK
ACK
D7～D0 No ACK
ACK
ACK
ACK
D7～D0
ACK
ACK
No ACK
ACK
D7～D0 No ACK
No
No
No
No
Yes
Yes
No
No
*- is Don’t Care
State of Write Protect Registor
In case, protect by PSWP
Command
PSWP, SWP, CWP
SWP
CWP
PSWP
PSWP, SWP, CWP
In case, protect by SWP
In case, Not protect
ACK
No ACK
No ACK
ACK
ACK
ACK
Address
-
ACK
No ACK
No ACK
No ACK
No ACK
No ACK
Data
-
ACK
No ACK
No ACK
No ACK
No ACK
No ACK
○Write Cycle
During WRITE CYCLE operation data is written in the EEPROM. The Byte Write Cycle is used to write only one byte. In
the case of writing continuous data consisting of more than one byte, Page Write is used. The maximum bytes that can
be written at one time is 16 bytes.
S
T
A
R
T
SDA
LINE
W
R
I
T
E
SLAVE
ADDRESS
WORD
ADDRESS
WA
7
1 0 1 0 A2 A1 A0
S
T
O
P
DATA
WA
0
D7
D0
A
C
K
R A
/ C
W K
A
C
K
Fig.33 Byte Write Cycle Timing
S
T
A
R
T
SDA
L IN E
S LA V E
ADDRESS
W
R
I
T
E
W ORD
A D D R E S S (n )
WA
7
1 0 1 0 A 2A 1A 0
R A
/ C
W K
D A TA (n)
WA
0
D7
A
C
K
S
T
O
P
D A TA (n + 1 5)
D0
D0
A
C
K
A
C
K
Fig.34 Page Write Cycle Timing
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© 2009 ROHM Co., Ltd. All rights reserved.
8/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
・With this command the data is programmed into the indicated word address.
・When the Master generates a STOP condition, the device begins the internal write cycle to the nonvolatile memory
array.
・Once programming is started no commands are accepted for tWR (5ms max.).
・This device is capable of sixteen-byte Page Write operations.
・If the Master transmits more than sixteen words prior to generating the STOP condition, the address counter will “roll
over” and the previously transmitted data will be overwritten.
・When two or more byte of data are input, the four low order address bits are internally incremented by one after the
receipt of each word, while the four higher order bits of the address (WA7～WA4) remain constant.
○Read Cycle
During Read Cycle operation data is read from the EEPROM. The Read Cycle is composed of Random Read Cycle and
Current Read Cycle. The Random Read Cycle reads the data in the indicated address.
The Current Read Cycle reads the data in the internally indicated address and verifies the data immediately after the
Write Operation. The Sequential Read operation can be performed with both Current Read and Random Read. With the
Sequential Read Cycle it is possible to continuously read the next data.
S
T
A
R
T
SDA
L IN E
W
R
I
T
E
SLAVE
ADDRESS
S
T
A
R
T
W ORD
A D D R E S S (n )
WA
7
1 0 1 0 A 2 A 1A 0
It is necessary to input
“High” at last ACK timing.
SLAVE
ADDRESS
WA
0
R A
/ C
W K
R
E
A
D
S
T
O
P
D A TA (n)
1 0 1 0 A 2 A 1A 0
D7
D0
A
C
K
R A
/ C
W K
A
C
K
Fig.35 Random Read Cycle Timing
S
T
A
R
T
SDA
LINE
R
E
A
D
SLAVE
ADDRESS
1 0 1 0 A2 A1 A0
S
T
O
P
DATA
D7
It is necessary to input
“High” at last ACK timing.
D0
A
C
K
R A
/ C
W K
Fig.36 Current Read Cycle Timing
・ Random Read operation allows the Master to access any memory location indicated by word address.
・ In cases where the previous operation is Random or Current Read (which includes Sequential Read), the internal
address counter is increased by one from the last accessed address (n). Thus Current Read outputs the data of the
next word address (n+1).
・ If an Acknowledge is detected and no STOP condition is generated by the Master (µ-COM), the device will continue to
transmit data. (It can transmit all data (2kbit 256word))
・ If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP condition
before returning to standby mode.
・ If an Acknowledge is detected with the "Low" level (not "High" level), the command will become Sequential Read, and
the next data will be transmitted. Therefore, the Read command is not terminated. In order to terminate Read input
Acknowledge with "High" always, then input a STOP condition.
S
T
A
R
T
SDA
L IN E
R
E
A
D
SLAVE
ADDRESS
1 0 1 0 A 2A 1A 0
D7
R A
/ C
W K
Fig.37
D A T A (n )
S
T
O
P
D A T A (n + x)
D0
D7
A
C
K
A
C
K
It is necessary to
input “High” at
last ACK timing.
D0
A
C
K
Sequential Read Cycle Timing （With Current Read）
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© 2009 ROHM Co., Ltd. All rights reserved.
9/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
○Write Protect Cycle
S
T
A
R
T
SDA
L IN E
W
R
I
T
E
SLAVE
ADDRESS
W ORD
ADDRESS
0 1 1 0 A 2A 1A 0
*
D ATA
*
R A
/ C
W K
WP
S
T
O
P
*
*
A
C
K
A
C
K
*:D O N ’T C A R E
Fig. 38 Permanent Write Protect Cycle
・Permanent set Write Protect command set data of 00h～7Fh in 256 words write protection block. Clear Write Protect
command can cancel write protection block which is set by set write Protect command. Cancel of write protection block
which is set by permanent set Write Protect command at once is impossibility. When these commands are carried out,
WP pin must be OPEN or GND.
・Permanent Set Write Protect command needs tWR from stop condition same as Byete Write and Page Write, During
tWR, input command is canceled.
・Refer to P8/19 about reply of ACK in each protect state.
S
T
A
R
T
SDA
L IN E
SLAVE
ADDRESS
W
R
I
T
E
0 1 1 0 0 0 1
W ORD
ADDRESS
*
D ATA
*
*
R A
/ C
W K
WP
S
T
O
P
*
A
C
K
A
C
K
*:D O N ’T C A R E
Fig. 39 Set Write Protect Cycle
・Permanent set Write Protect command set data of 00h～7Fh in 256 words write protection block. Clear Write Protect
command can cancel write protection block which is set by set write Protect command. Cancel of write protection block
which is set by permanent set Write Protect command at once is impossibility. When these commands are carried out,
WP pin must be OPEN or GND.
・Permanent Set Protect command needs tWR from stop condition same as Byete Write and Page Write, During tWR,
input command is canceled.
・Refer to P8/19 about reply of ACk in each protect state.
S
T
A
R
T
SDA
L IN E
SLAVE
ADDRESS
W
R
I
T
E
0 1 1 0 0 1 1
W ORD
ADDRESS
*
WP
D ATA
*
R A
/ C
W K
S
T
O
P
*
A
C
K
*
A
C
K
*:D O N ’T C A R E
Fig. 40 Clear Write Protect Cycle
・Clear Write Protect command can cancel write protection block which is set by set write Protect command. Cancel of
write protection block which is set by permanent set Write Protect command at once is impossibility. When these
commands are carried out, WP pin must be OPEN or GND.
・Permanent Clear Write Protect command needs tWR from stop condition same as Byete Write and Page Write, During
tWR, input command is canceled.
・Refer to P8/19 about reply of ACk in each protect state.
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© 2009 ROHM Co., Ltd. All rights reserved.
10/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Software Reset
Execute software reset in the event that the device is in an unexpected state after power up and/or the command input
needs to be reset. Below are three types(Fig.39 –(a), (b), (c)) of software reset:
During dummy clock, release the SDA BUS (tied to VCC by a pull-up resistor). During this time the device may pull the SDA
line Low for Acknowledge or the outputting of read data.If the Master sets the SDA line to High, it will conflict with the device
output Low, which can cause current overload and result in instantaneous power down, which may damage the device.
DUMMY CLOCK×14
SCL
1
2
13
START×2
COMMAND
14
SDA
COMMAND
Fig.39-(a) DUMMY CLOCK×14 + START+START
START
1
SCL
START
DUMMY CLOCK×9
2
8
9
COMMAND
SDA
COMMAND
Fig.39-(b) START + DUMMY CLOCK×9 + START
START×9
SCL
1
7
3
2
8
9
COMMAND
SDA
COMMAND
Fig.39-(c) START×9
* COMMAND starts with start condition.
●Acknowledge polling
Since the IC ignores all input commands during the internal write cycle, no ACK signal will be returned.
When the Master sends the next command after the Write command, if the device returns an ACK signal it means that the
program is completed. No ACK signal indicates that the device is still busy.
Using Acknowledge polling decreases the waiting time by tWR=5ms.
When operating Write or Current Read after Write, first transmit the Slave address (R/W is"High" or "Low"). After the device
returns the ACK signal continue word address input or data output.
During the internal write cycle,
no ACK will be returned.
THE FIRST WRITE COMMAND
(ACK=High)
S
T
A
R
T
WRITE COMMAND
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
A
C
K
H
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
H
・・・
tWR
THE SECOND WRITE COMMAND
・・・
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
H
S
T
A
R
T
SLAVE
ADDRESS
tWR
A
C
K
L
WORD
ADDRESS
A
C
K
L
DATA
A
C
K
L
S
T
O
P
After the internal write cycle
is completed, ACK will be returned
(ACK=Low). Then input next
Word Address and data.
Fig.40 Successive Write Operation By Acknowledge Polling
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© 2009 ROHM Co., Ltd. All rights reserved.
11/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●WP effective timing
WP is normally fixed at "H" or "L". However, in case WP needs to be controlled in order to cancel the Write command, pay
attention to “WP effective timing” as follows:
The Write command is canceled by setting WP to "H" within the WP cancellation effective period.
The period from the START condition to the rising edge of the clock (which takes in the data DO - the first byte of the Page
Write data) is the ‘invalid cancellation period’. WP input is considered inconsequential during this period. The setup time for
the rising edge of the SCL, which takes in DO, must be more than 100ns.
The period from the rising edge of SCL (which takes in the data D0) to the end of internal write cycle (tWR) is the ‘effective
cancellation period’. When WP is set to "H" during tWR, Write operation is stopped, making it necessary to rewrite the data.
It is not necessary to wait for tWR (5ms max.) after stopping the Write command by WP because the device is in standby
mode.
・The
rising edge of the clock
which take in D0
SCL
SDA
D1
D0
・The rising edge
・of SDA
SCL
SDA
ACK
D0
AN ENLARGEMENT
AN ENLARGEMENT
SDA
S
A
T SLAVE C WORD
A
K
R ADDRESS L ADDRESS
T
WP
ACK
A
A
C
C
K D7 D6 D5 D4 D3 D2 D1 D0 K
L
L
DATA
A
C
K
L
S
T
O
P
tWR
WP cancellation
WP cancellation
Stop of the write
invalid period
effective period
operation
Data is not
No data will be written
guaranteed
Fig.41 WP effective timing
●Command cancellation from the START and STOP conditions
Command input is canceled by successive inputs of START and STOP conditions. (Refer to Fig.42)
However, during ACK or data output, the device may set the SDA line to Low, making operation of the START and STOP
conditions impossible, and thus preventing reset. In this case execute reset by software. (Refer to Fig.39)
The internal address counter will not be determined when operating the Cancel command by the START and STOP
conditions during Random, Sequential or Current Read. Operate a Random Read in this case.
SCL
SDA
1
0
1
0
START
CONDITION
STOP
CONDITION
Fig.42 Command cancellation by the START and STOP conditions during input of the Slave Address
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© 2009 ROHM Co., Ltd. All rights reserved.
12/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●I/O Circuit
○SDA Pin Pull-up Resistor
A pull-up resistor is required because SDA is an NMOS open drain. Determine the resistor value of (RPU) by considering
the VIL and IL, and VOL-IOL characteristics. If a large RPU is chosen, the clock frequency needs to be slow. A smaller
RPU will result in a larger operating current.
○Maximum RPU
The maximum of RPU can be determined by the following factors.
①The SDA rise time determined by RPU and the capacitance of the BUS line(CBUS) must be less than tR.
In addition, all other timings must be kept within the AC specifications.
A at the SDA BUS is determined from the total input leakage(IL) of all
②When the SDA BUS is High, the voltage ○
devices connected to the BUS. RPU must be higher than the input High level of the microcontroller and the device,
including a noise margin 0.2VCC.
Microcontroller
VCC-ILRPU-0.2 VCC ≧ VIH
RPU ≦
∴
BR34E02
0.8VCC-VIH
IL
RPU
SDA PIN
A
Examples: When VCC =3V, IL=10µA, VIH=0.7 VCC
IL
According to ②
RPU
0.8x3-0.7x3
≦
≦
IL
-6
10x10
THE CAPACITANCE OF BUS
LINE (CBUS)COMPUTER
300 [kΩ]
Fig.43 I/O Circuit
○Minimum RPU
The minimum value of RPU is determined by following factors.
①Meets the condition that VOLMAX=0.4V, IOLMAX=3mA when the output is Low.
VCC -VOL
≦ IOL
R PU
VCC -VOL
IOL
②VOLMAX=0.4V must be lower than the input Low level of the microcontroller and the EEPROMincluding the
recommended noise margin of 0.1VCC.
VOLMAX ≦ VIL-0.1 VCC
Examples: VCC=3V, VOL=0.4V, IOL=3mA, the VIL of the controller and the EEPROM is VIL=0.3VCC, According to ①
∴
RPU ≧
RPU
≧
3-0.4
3×10 -3
≧ 867 ［Ω］
VOL=0.4［V］
VIL=0.3×3
=0.9［V］
o that condition ② is met
and
and
○SCL Pin Pull-up Resistor
When SCL is controlled by the CMOS output the pull-up resistor at SCL is not required.
However, should SCL be set to Hi-Z, connection of a pull-up resistor between SCL and VCC is recommended.
Several kΩ are recommended for the pull-up resistor in order to drive the output port of the microcontroller.
●A0, A1, A2, WP Pin connections
○Device Address Pin (A0, A1, A2) connections
The status of the device address pins is compared with the device address sent by the Master. One of the devices that is
connected to the identical BUS is selected. Pull up or down these pins or connect them to VCC or GND. Pins that are not
used as device address (N.C.Pins) may be High, Low, or Hi-Z.
○WP Pin connection
The WP input allows or prohibits write operations. When WP is High, only Read is available and Write to all address is
prohibited. Both Read and Write are available when WP is Low.
In the event that the device is used as a ROM, it is recommended that the WP input be pulled up or connected to VCC.
When both READ and WRITE are operated, the WP input must be pulled down or connected to GND or controlled.
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© 2009 ROHM Co., Ltd. All rights reserved.
13/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Microcontroller connection
○Concerning Rs
2
The open drain interface is recommended for the SDA port in the I C BUS. However, if the Tri-state CMOS interface is
applied to SDA, insert a series resistor (Rs) between the SDA pin of the device and the pull up resistor RPU is
recommended, since it will serve to limit the current between the PMOS of the microcontroller, and the NMOS of the
EEPROM. Rs also protects the SDA pin from surges. Therefore, Rs is able to be used though open drain inout of the
SDA port.
ACK
RPU
SCL
RS
SDA
'H'OUTPUT OF
CONTROLLER
“L” OUTPUT OF EEPROM
CONTROLLER
The “H” output of controller and the “L” output of
EEPROM may cause current overload to SDA line.
EEPROM
Fig.44 I/O Circuit
Fig.45 Input/Output Collision Timing
○Rs Maximum
The maximum value of Rs is determined by following factors.
①SDA rise time determined by RPU and the capacitance value of the BUS line (CBUS) of SDA must be less than tR. In
addition, the other timings must be within the timing conditions of the AC.
A is determined by RPU, and Rs must be lower than the
②When the output from SDA is Low, the voltage of the BUS at ○
input Low level of the microcontroller, including recommended noise margin (0.1VCC).
VCC
(VCC -VOL)×R S
RPU +R S
RPU A
RS
VOL
∴
IOL
BUS
CAPACITANCE
VIL
≦
VOL+0.1VCC ≦VIL
VIL-VOL-0.1VCC
1.1VCC -VIL
×
RPU
Examples : When VCC =3V　VIL=0.3VCC VOL=0.4V　R PU =20kΩ
EEPROM
CONTROLLER
RS
+
According to ② RS
≦
0.3×3-0.4-0.1×3
1.1×3-0.3×3
×
20×103
Fig.46 I/O Circuit
≦ 1.67［kΩ］
○Rs Minimum
The minimum value of Rs is determined by the current overload during BUS conflict.
Current overload may cause noises in the power line and instantaneous power down.
The following conditions must be met, where “I” is the maximum permissible current, which depends on the Vcc line
impedance as well as other factors. “I” current must be less than 10mA for EEPROM.
Vcc
≦
RS
RPU
"L" OUTPUT
RS
"H" OUTPUT
∴ RS ≧
I
Vcc
I
Examples: When VCC=3V, I=10mA
MAXIMUM
CURRENT
RS ≧
CONTROLLER
3
10×10-3
EEPROM
≧ 300［Ω］
Fig.47 I/O Circuit
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© 2009 ROHM Co., Ltd. All rights reserved.
14/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●I2C BUS Input / Output equivalent circuits
○Input (A0,A2,SCL)
Fig.48 Input Pin Circuit
○Input / Output (SDA)
Fig.49 Input / Output Pin Circuit
○Input (A1)
Fig.50 Input Pin Circuit
○Input (WP)
Fig.51 Input Pin Circuit
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© 2009 ROHM Co., Ltd. All rights reserved.
15/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Power Supply Notes
VCC increases through the low voltage region where the internal circuit of IC and the microcontroller are unstable. In order
to prevent malfunction, the IC has P.O.R and LVCC functionality. During power up, ensure that the following conditions are
met to guaranty P.O.R. and LVCC operability.
1. "SDA='H'" and "SCL='L' or 'H'".
2. Follow the recommended conditions of tR, tOFF, Vbot so that P.O.R. will be activated during power up.
tR
VCC
Recommended conditions of tR, tOFF, Vbot
tOFF
Vbot
0
Fig.52 VCC rising wavefrom
tR
tOFF
Vbot
Below 10ms
Above 10ms
Below 0.3V
Below 100ms
Above 10ms
Below 0.2V
3. Prevent SDA and SCL from being "Hi-Z".
In case that condition 1. and/or 2. cannot be met, take following actions.
A) If unable to keep Condition 1 (SDA is "Low" during power up)
→Make sure that SDA and SCL are "High" as in the figure below.
VCC
tLOW
SCL
SDA
After Vcc becomes stable
After Vcc becomes stable
tDH
tSU:DAT
Fig.53 SCL="H" and SDA="L"
tSU:DAT
Fig.54 SCL="L" and SDA="L"
B) If unable to keep Condition 2
→After the power stabilizes, execute software reset. (See page 9,10)
C) If unable to keep either Condition 1 or 2
→Follow Instruction A first, then B
●LVCC Circuit
The LVCC circuit prevents Write operation at low voltage and prevents inadvertent writing. A voltage below the LVCC voltage
(1.2V typ.) prohibits Write operation.
●VCC Noise
○Bypass Capacitor
Noise and surges on the power line may cause abnormal function. It is recommended that bypass capacitors (0.1µF) be
attached between VCC and GND externally.
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© 2009 ROHM Co., Ltd. All rights reserved.
16/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Notes for Use
1) Descrived numeric values and data are design representative values, and the values are not guaranteed.
2) We believe that application circuit examples are recommendable, however, in actual use, confirm characteristics further
sufficiently. In the case of use by changing the fixed number of external parts, make your decision with sufficient margin
in consideration of static characteristics and transition characteristics and fluctuations of external parts and our LSI.
3) Absolute maximum ratings
If the absolute maximum ratings such as impressed voltage and action temperature range and so forth are exceeded, LSI
may be destructed. Do not impress voltage and temperature exceeding the absolute maximum ratings. In the case of fear
exceeding the absolute maximum ratings, take physical safety countermeasures such as fuses, and see to it that
conditions exceeding the absolute maximum ratings should not be impressed to LSI.
4) GND electric potential
Set the voltage of GND terminal lowest at any action condition. Make sure that each terminal voltage is lower than that of
GND terminal.
5) Heat design
In consideration of permissible dissipation in actual use condition, carry out heat design with sufficient margin.
6) Terminal to terminal short circuit and wrong packaging
When to package LSI on to a board, pay sufficient attention to LSI direction and displacement. Wrong packaging may
destruct LSI. And in the case of short circuit between LSI terminals and terminals and power source, terminal and GND
owing to foreign matter, LSI may be destructed.
7) Use in a strong electromagnetic field may cause malfunction, therfore, evaluate design sufficiently.
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© 2009 ROHM Co., Ltd. All rights reserved.
17/18
2009.04 - Rev.A
Technical Note
BR34E02FVT-W, BR34E02NUX-W
●Ordering part number
B
R
3
ROHM type
4
E
BUS type
0
2
F
Priduct type Capacity
34：I2C
V
T
Packagr
02= 2K
-
W
E
2
W : Double cell
FVT:TSSOP-B8
Packaging and forming specification
NUX:VSON008X2030
E2: Embossed tape and reel
(TSSOP-B8)
TR: Embossed tape and reel
(VSON008X2030)
SSOP-B8
<Tape and Reel information>
3.0 ± 0.2
(MAX 3.35 include BURR)
0.3MIN
4.4±0.2
6.4±0.3
8 76 5
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
1.15±0.1
1 23 4
0.15 ± 0.1
0.1
S
0.1
+0.06
0.22 -0.04
(0.52)
0.08
M
0.65
Direction of feed
1pin
Reel
(Unit : mm)
∗ Order quantity needs to be multiple of the minimum quantity.
VSON008X2030
<Tape and Reel information>
3.0±0.1
2.0±0.1
1.0MAX
1PIN MARK
0.25
TR
The direction is the 1pin of product is at the upper right when you hold
( reel on the left hand and you pull out the tape on the right hand
)
(0.22)
+0.03
0.02 –0.02
1.5±0.1
4000pcs
0.5
1
4
8
5
1.4±0.1
0.3±0.1
C0.25
Embossed carrier tape
Quantity
Direction
of feed
S
0.08 S
Tape
+0.05
0.25 –0.04
1pin
Reel
(Unit : mm)
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© 2009 ROHM Co., Ltd. All rights reserved.
18/18
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2009.04 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
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shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
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The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller,
fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of
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such special purpose, please contact a ROHM sales representative before purchasing.
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Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
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http://www.rohm.com/contact/
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© 2009 ROHM Co., Ltd. All rights reserved.
R0039A