BR24L256F-W [ROHM]
EEPROM, 32KX8, Serial, CMOS, PDSO8, ROHS COMPLIANT, SOP-8;
| 型号： | BR24L256F-W |
| 厂家： | 
ROHM |
| 描述： | EEPROM, 32KX8, Serial, CMOS, PDSO8, ROHS COMPLIANT, SOP-8 可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器 光电二极管 |
| 文件： | 总33页 (文件大小：883K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL NOTE
High Reliability Series Serial EEPROM Series
I2C BUS
Serial EEPROMs
BR24L□□-W Series
BR24L01A-W, BR24L02-W, BR24L04-W, BR24L08-W,
BR24L16-W, BR24L32-W, BR24L64-W
BR24S□□□-W Series
BR24S16-W, BR24S32-W, BR24S64-W, BR24S128-W, BR24S256-W
ROHM's series of serial EEPROMs represent the highest level of reliability on the market. A double cell structure provides a
failsafe method of data reliability, while a double reset function prevents data miswriting. In addition, gold pads and gold
wires are used for internal connections, pushing the boundaries of reliability to the limit.
BR24L□□-W Series assort 1Kbit～64Kbit. BR24S□□□-W Series are possible to operate at high speed in low voltage and
assort 16Kbit～256Kbit.
Contents
BR24L□□-W Series
BR24L01A-W, BR24L02-W, BR24L04-W, BR24L08-W,
BR24L16-W, BR24L32-W, BR24L64-W
・・・・P2
BR24S□□□-W Series
BR24S16-W, BR24S32-W, BR24S64-W,
BR24S128-W, BR24S256-W
・・・・P17
Sep. 2008
I2C BUS Serial EEPROMs
BR24L□□-W Series
BR24L01A-W, BR24L02-W, BR24L04-W, BR24L08-W,
BR24L16-W, BR24L32-W, BR24L64-W
●Description
BR24L□□-W series is a serial EEPROM of I2C BUS interface method.
●Features
・ Completely conforming to the world standard I2C BUS. All controls available by 2 ports of serial clock(SCL) and serial
data(SDA)
・ Other devices than EEPROM can be connected to the same port, saving microcontroller port
・ 1.8V~5.5V *1 single power source action most suitable for battery use
・ Page write mode useful for initial value write at factory shipment
・ Highly reliable connection by Au pad and Au wire
・ Auto erase and auto end function at data rewrite
・ Low current consumption
At write operation (5V)
At read operation (5V)
: 1.2mA (Typ.) *2
: 0.2mA (Typ.)
At standby operation (5V) : 0.1μA (Typ.)
・ Write mistake prevention function
Write (write protect) function added
Write mistake prevention function at low voltage
・ SOP8/SOP-J8/SSOP-B8/TSSOP-B8/MSOP8/TSSOP-B8J/VSON008X2030 compact package *3
・ Data rewrite up to 1,000,000 times
・ Data kept for 40 years
Page write
Number of
Pages
・ Noise filter built in SCL / SDA terminal
・ Shipment data all address FFh
8Byte
16Byte
32Byte
*1 BR24L02-W、BR24L16-W、BR24L32-W : 1.7～5.5V
*2 BR24L32-W、BR24L64-W : 1.5mA
*3 Refer to following list
BR24L04-W
BR24L08-W
BR24L16-W
Product
number
BR24L01A-W
BR24L02-W
BR24L32-W
BR24L64-W
●BR24L series
VSON008
X2030
NUX
SOP8
SOP-J8
SSOP-B8 TSSOP-B8 MSOP8 TSSOP-B8J
Power source
Voltage
Capacity Bit format
Type
F
FJ
●
●
●
●
●
●
●
FV
●
●
●
●
●
●
FVT
●
●
●
●
●
●
FVM
●
FVJ
●
●
●
●
●
1Kbit
2Kbit
128×8
256×8
512×8
1K×8
2K×8
4K×8
8K×8
BR24L01A-W 1.8～5.5V
BR24L02-W 1.7～5.5V
BR24L04-W 1.8～5.5V
BR24L08-W 1.8～5.5V
BR24L16-W 1.7～5.5V
BR24L32-W 1.7～5.5V
BR24L64-W 1.8～5.5V
●
●
●
●
●
●
●
●
●
●
●
●
4Kbit
●
8Kbit
●
16Kbit
32Kbit
64Kbit
●
2/32
●Memory cell characteristics (Ta=25℃, Vcc=1.8～5.5V)*1
●Absolute maximum ratings (Ta=25℃)
Unit
V
Parameter
symbol
Limits
Limits
Impressed voltage
VCC
－0.3～+6.5
Parameter
Unit
450 (SOP8) *1
Min.
Typ.
－
Max.
－
450 (SOP-J8) *2
Number of data rewrite times *2
Data hold years *2
1,000,000
Times
Years
300 (SSOP-B8) *3
330 (TSSOP-B8) *4
310 (MSOP8) *5
－
－
40
Permissible
dissipation
mW
Pd
○Shipment data all address FFh
*1
BR24L02/16/32-W : 1.7~5.5V
Not 100% TESTED
*2
310 (TSSOP-B8J) *6
300 (VSON008X2030) *7
Storage
temperature range
Action
temperature range
Terminal voltage
●Recommended operating conditions
Tstg
－65～+125
℃
Parameter
Power source voltage
Input voltage
Symbol
Vcc
Limits
1.8～5.5 *1
0～Vcc
Unit
V
Topr
－40～+85
℃
－
－0.3～Vcc+1.0
V
When using at Ta=25℃ or higher, 4.5mW(*1,*2), 3.0mW(
*3,*7
)
VIN
*1 BR24L02/16/32-W : 1.7~5.5V
*4
3.3mW( ),3.1mW(*5,*6) to be reduced per 1℃
●Electrical characteristics (Unless otherwise specified, Ta=－40～+85℃, VCC=1.8～5.5V) *1
Limits
Parameter
Symbol
Unit
Conditions
Min.
0.7Vcc
－0.3 *2
0.8Vcc
－0.3 *2
0.8Vcc
0.9Vcc
－0.3
－
Typ.
－
－
－
－
－
－
－
－
－
－
－
Max.
Vcc +1.0 *2
0.3 Vcc
Vcc +1.0 *2
0.2 Vcc
Vcc +1.0
Vcc +1.0
0.1 Vcc
0.4
“HIGH” input voltage 1
“LOW” input voltage 1
“HIGH” input voltage 2
“LOW” input voltage 2
“HIGH” input voltage 3 *3
“HIGH” input voltage 3 *4
“LOW” input voltage 3 *2
“LOW” output voltage 1
“LOW” output voltage 2
Input leak current
VIH1
VIL1
VIH2
VIL2
VIH3
VIH3
VIL3
VOL1
VOL2
ILI
V
V
2.5≦Vcc≦5.5V
2.5≦Vcc≦5.5V
1.8≦Vcc＜2.5V
1.8≦Vcc＜2.5V
1.7≦Vcc＜1.8V
1.7≦Vcc＜1.8V
1.7≦Vcc＜1.8V
V
V
V
V
V
V
IOL=3.0mA, 2.5V≦Vcc≦5.5V, (SDA)
IOL=0.7mA, 1.7V≦Vcc＜2.5V, (SDA)
VIN=0V～Vcc
－
0.2
V
－1
1
μA
μA
Output leak current
ILO
－1
1
VOUT=0V～Vcc, (SDA)
2.0 *5
Vcc=5.5V,fSCL=400kHz, tWR=5ms,
Byte write, Page write
ICC1
ICC2
ISB
－
－
－
－
－
－
mA
mA
μA
3.0 *6
Current consumption at
action
Vcc=5.5V,fSCL=400kHz
0.5
Random read, current read, sequential read
Vcc=5.5V, SDA・SCL=Vcc
A0, A1, A2=GND, WP=GND
Standby current
2.0
*1 BR24L02/16/32-W : 1.7～5.5V, *2 BR24L16/32-W, *3 BR24L02/16-W, *4 BR24L32-W
◎Radiation resistance design is not made.
*5 BR24L01A/02/04/08/16-W, *6 BR24L32/64-W
●Action timing characteristics (Unless otherwise specified, Ta=－40～+85℃, VCC=1.8～5.5V)*1
FAST-MODE
STANDARD-MODE
Parameter
Symbol
2.5V≦Vcc≦5.5V
1.8V≦Vcc≦5.5V
Unit
Min.
－
Typ.
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
Max.
400
－
Min.
－
Typ.
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
Max.
100
－
SCL frequency
fSCL
tHIGH
tLOW
tR
kHz
μs
μs
μs
μs
μs
μs
ns
Data clock “HIGH“ time
Data clock “LOW“ time
SDA, SCL rise time *2
SDA, SCL fall time *2
0.6
1.2
－
4.0
4.7
－
－
－
0.3
0.3
－
1.0
0.3
－
tF
－
－
Start condition hold time
Start condition setup time
Input data hold time
tHD:STA
tSU:STA
tHD:DAT
tSU:DAT
tPD
0.6
0.6
0
4.0
4.7
0
－
－
－
－
Input data setup time
100
0.1
0.1
0.6
1.2
－
－
250
0.2
0.2
4.7
4.7
－
－
ns
Output data delay time
Output data hold time
Stop condition setup time
Bus release time before transfer start
Internal write cycle time
Noise removal valid period (SDA, SCL terminal)
WP hold time
0.9
－
3.5
－
μs
μs
μs
μs
ms
μs
ns
tDH
tSU:STO
tBUF
－
－
－
－
tWR
5
5
tI
－
0.1
－
－
0.1
－
tHD:WP
tSU:WP
tHIGH:WP
0
0
WP setup time
0.1
1.0
－
0.1
1.0
－
μs
WP valid time
－-
－
μs
*1 BR24L02/16/32-W : 1.7～5.5V
*2 Not 100% tested
●FAST-MODE and STANDARD-MODE
FAST-MODE and STANDARD-MODE are of same actions, and mode is changed. They are distinguished by action
speeds. 100kHz action is called STANDARD-MODE, and 400kHz action is called FAST-MODE. This action frequency is
the maximum action frequency, so 100kHz clock may be used in FAST-MODE. When power source voltage goes down,
action at high speed is not carried out, therefore, at Vcc=2.5V～5.5V , 400kHz, namely, action is made in FASTMODE.
(Action is made also in STANDARD-MODE) Vcc=1.8V~2.5V is only action in 100kHz STANDARD-MODE.
3/32
●Sync data input / output timing
tR
tF
tSU:DAT tLOW
tPD
tHIGH
SCL
SCL
DATA(1)
D1 D0 ACK
DATA(n)
tHD:STA
tBUF
tHD:DAT
SDA
(input)
ACK
SDA
WP
ｔWR
Stop condition
tDH
SDA
(output)
○Input read at the rise edge of SCL
tSU：WP
ｔHD：WP
○Data output in sync with the fall of SCL
Fig.1-(d) WP timing at write execution
Fig.1-(a) Sync data input / output timing
SCL
SDA
SCL
SDA
tSU:STA
tHD:STA
tSU:STO
DATA(n)
DATA(1)
D1 D0 ACK
ACK
tHIGH:WP
tWR
START BIT
STOP BIT
WP
Fig.1-(b) Start-stop bit timing
○At write execution, in the area from the D0 taken clock rise of the first
DATA(1), to tWR, set WP=“LOW”.
SCL
SDA
○By setting WP “HIGH” in the area, write can be cancelled.
When it is set WP=“HIGH” during tWR, write is forcibly ended, and data of
address under access is not guaranteed, therefore write it once again.
D0
ACK
Write data
ｔWR
Stop condition
(n-th address)
Start condition
Fig.1-(e) WP timing at write cancel
Fig.1-(c) Write cycle timing
●Block diagram
*2
1Kbit~64Kbit EEPROM array
1
2
A0
8
7
Vcc
WP
*1
7bit 11bit
8bit 12bit
9bit 13bit
10bit
8bit
7bit 11bit
8bit 12bit
*2
Data
register
Address
decoder
Slave - word
A1
A2
*1
9bit
10bit
13bit
address register
START
STOP
*2
3
4
6
5
SCL
SDA
Control circuit
ACK
High voltage
generating circuit
Power source
voltage detection
GND
1
＊
＊2 A0=N.C.
A0, A1=N.C.
A0, A1= N.C. A2=Don’t Use
: BR24L04-W
: BR24L08-W
: BR24L16-W
7bit : BR24L01A-W 10bit : BR24L08-W
8bit : BR24L02-W
9bit : BR24L04-W
11bit : BR24L16-W
12bit : BR24L32-W
13bit : BR24L64-W
Fig.2 Block diagram
●Pin assignment and description
Function
Terminal
name
Input /
output
BR24L01A-W
BR24L02-W
BR24L04-W
BR24L08-W
BR24L16-W
BR24L32-W
BR24L64-W
A0
A1
1
2
3
4
8
Vcc
WP
A0
A1
Input
Input
Input
-
Slave address setting
Not connected
Slave address setting
Slave address setting
Slave address setting
BR24L01A-W
BR24L02-W
BR24L04-W
BR24L08-W
BR24L16-W
BR24L32-W
BR24L64-W
Slave address setting
Not connected
Not used
7
6
5
A2
Slave address setting
GND
Reference voltage of all input / output, 0V
A2
SCL
SDA
Input /
output
SDA
Slave and word address, Serial data input serial data output
GND
SCL
WP
Vcc
Input
Input
-
Serial clock input
Write protect terminal
Connect the power source.
4/32
●Characteristic data (The following values are6Typ. ones.)
6
1
0.8
0.6
0.4
0.2
0
5
4
3
2
1
0
5
4
3
2
1
0
Ta=85℃
Ta=-40℃
Ta=25℃
SPEC
SPEC
Ta=85℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
SPEC
Ta=-40℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
6
6
Vcc[V]
IOL1[mA]
Vcc[V]
Fig.3 H input voltage VIH1,2
Fig.4 L input voltageVIL1,2ꢀ(SCL,SDA,WP)
Fig.5 L output voltageꢀVOL1-IOL1ꢀ(VCC=2.5V)
1
1.2
1
1.2
1
SPEC
SPEC
0.8
0.6
0.4
0.2
0
0.8
0.6
0.4
0.2
0
0.8
0.6
0.4
0.2
0
Ta=25℃
Ta=85℃
SPEC
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=-40℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
IOL2[mA]
Vcc[V]
Vcc[V]
Fig.6 L output voltage VOL2-IOL2ꢀ(VCC=1.8V)
Fig.7 Input leak current ILIꢀ(SCL,WP)
Fig.8 Output leak currentꢀILO(SDA)
2.5
3.5
3
0.6
0.5
0.4
0.3
0.2
0.1
0
[BR24L32/64 series]
[BR24L01A/02/04/08/16 series]
SPEC
fSCL=400kHz
SPEC
DATA=AAh
2
1.5
1
fSCL=400kHz
DATA=AAh
fSCL=400kHz
DATA=AAh
SPEC
2.5
2
Ta=85℃
Ta=25℃
1.5
1
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
0.5
0
Ta=-40℃
0.5
0
0
1
2
3
4
5
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Vcc[V]
Vcc[V]
Vcc[V]
Fig.9 Current consumption at WRITE action ICC1
(fscl=400kHz)
Fig.10 Current consumption at WRITE action ICC1
(fSCL=400kHz)
Fig.11 Current consumption at READ action ICC2
(fSCL=400kHz)
2.5
2
3.5
3
0.6
0.5
0.4
0.3
0.2
0.1
0
[BR24L32/64 series]
SPEC
[BR24L01A/02/04/08/16 series]
SPEC
fSCL=100kHz
SPEC
fSCL=100kHz
DATA=AAh
fSCL=100kHz
DATA=AAh
2.5
2
DATA=AAh
1.5
1
1.5
1
Ta=85℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=25℃
Ta=85℃
Ta=-40℃
0.5
0
0.5
0
Ta=-40℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Vcc[V]
Vcc[V]
Vcc[V]
Fig.12 Current consumption at WRITE action ICC1
(fSCL=100kHz)
Fig.13 Current consumption at WRITE action ICC1
(fSCL=100kHz)
Fig.14 Current consumption at READ action ICC2
(fSCL=100kHz)
2.5
10000
1000
100
10
5
4
3
2
1
0
SPEC2
SPEC
2
1.5
1
Ta=85℃
Ta=25℃
Ta=-40℃
SPEC1
SPEC2
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=85℃
SPEC1
0.5
0
Ta=-40℃
Ta=25℃
1
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Vcc[V]
Vcc[V]
Vcc[V]
Fig.15 Standby currentꢀISB
Fig.16 SCL frequencyꢀfSCL
Fig.17 Data clock "H" time tHIGH
5
4
3
2
1
0
6
5
4
3
2
1
0
5
4
3
2
1
0
SPEC2
SPEC2
SPEC2
SPEC1
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC1
SPEC1
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Vcc[V]
Vcc[V]
Vcc[V]
Fig.18 Data clock "L" time tLOW
Fig.19 Start condition hold timeꢀtHD:STA
Fig.20 Start condition setup time tSU:STA
5/32
●Characteristic data (The following values are Typ. ones).
50
300
200
100
0
50
SPEC1,2
SPEC1,2
SPEC2
0
0
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC1
-50
-50
Ta=85℃
Ta=25℃
-100
-150
-200
-100
-150
-200
Ta=85℃
Ta=25℃
Ta=-40℃
-100
-200
Ta=-40℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Vcc[V]
Vcc[V]
Vcc[V]
Fig.21 Input data hold time tHD:DAT(HIGH)
Fig.22 Input data hold timeꢀtHD:DAT(LOW)
Fig.23 Input data setup timeꢀtSU:DAT(HIGH)
300
200
100
0
4
3
2
1
0
4
3
2
1
0
SPEC2
SPEC1
SPEC2
SPEC2
Ta=85℃
Ta=85℃
Ta=25℃
Ta=-40℃
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC1
SPEC1
Ta=-40℃
-100
-200
SPEC2
SPEC1
SPEC2
SPEC1
Ta=25℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
6
6
0
1
2
3
4
5
6
6
6
Vcc[V]
Vcc[V]
Vcc[V]
Fig.24 Input data setup time tSU:DAT(LOW)
Fig.25 Output data delay time tPD0
Fig.26 Output data delay timeꢀtPD1
5
4
3
2
1
0
6
5
4
3
2
1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
SPEC1,2
SPEC2
Ta=25℃
Ta=-40℃
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=85℃
SPEC1,2
Ta=-40℃
SPEC1
Ta=25℃
Ta=85℃
0
1
2
3
4
5
6
0
1
2
3
4
5
0
1
2
3
4
5
Vcc[V]
Vcc[V]
Vcc[V]
Fig.27 Bus release time before transfer start tBUF
Fig.28 Internal write cycle timeꢀtWR
Fig.29 Noise removal valid time tI(SCL H)
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
Ta=25℃
Ta=-40℃
Ta=-40℃
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC1,2
Ta=85℃
Ta=25℃
SPEC1
Ta=85℃
SPEC1
0
1
2
3
4
5
6
0
1
2
3
4
5
0
1
2
3
4
5
Vcc[V]
Vcc[V]
Vcc[V]
Fig.30 Noise removal valid time tI(SCL L)
Fig.31 Noise removal valid time tI(SDA H)
Fig.32 Noise removal valid time tI(SDA L)
1.2
1
0.2
0
SPEC1,2
SPEC1,2
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=25℃
Ta=-40℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Vcc[V]
Vcc[V]
Fig.33 WP setup timeꢀtSU:WP
Fig.34 WP valid timeꢀtHIGH:WP
6/32
●I2C BUS communication
○I2C BUS data communication
I2C BUS data communication starts by start condition input, and ends by stop condition input. Data is always 8bit long, and
acknowledge is always required after each byte. I2C BUS carries out data transmission with plural devices connected by 2
communication lines of serial data (SDA) and serial clock (SCL).
Among devices, there are “master” that generates clock and control communication start and end, and “slave” that is
controlled by address peculiar to devices. EEPROM becomes “slave”. And the device that outputs data to bus during data
communication is called “transmitter”, and the device that receives data is called “receiver”.
SDA
1-7
1-7
1-7
8
9
8
9
8
9
SCL
S
P
START ADDRESS R/W
condition
ACK
DATA
ACK
DATA
ACK
STOP
condition
Fig.35 Data transfer timing
○Start condition (Start bit recognition)
・Before executing each command, start condition (start bit) where SDA goes from 'HIGH' down to 'LOW' when SCL is
'HIGH' is necessary.
・This IC always detects whether SDA and SCL are in start condition (start bit) or not, therefore, unless this confdition is
satisfied, any command is executed.
○Stop condition (stop bit recongnition)
・Each command can be ended by SDA rising from 'LOW' to 'HIGH' when stop condition (stop bit), namely, SCL is 'HIGH'
○Acknowledge (ACK) signal
・This acknowledge (ACK) signal is a software rule to show whether data transfer has been made normally or not. In master
and slave, the device (μ-COM at slave address input of write command, read command, and this IC at data output of read
command) at the transmitter (sending) side releases the bus after output of 8bit data.
・The device (this IC at slave address input of write command, read command, and μ-COM at data output of read
command) at the receiver (receiving) side sets SDA 'LOW' during 9 clock cycles, and outputs acknowledge signal (ACK
signal) showing that it has received the 8bit data.
・This IC, after recognizing start condition and slave address (8bit), outputs acknowledge signal (ACK signal) 'LOW'.
・Each write action outputs acknowledge signal (ACK signal) 'LOW', at receiving 8bit data (word address and write data).
・Each read action outputs 8bit data (read data), and detects acknowledge signal (ACK signal) 'LOW'.
・When acknowledge signal (ACK signal) is detected, and stop condition is not sent from the master (μ-COM) side, this IC
continues data output. When acknowledge signal (ACK signal) is not detected, this IC stops data transfer, and recognizes
stop cindition (stop bit), and ends read action. And this IC gets in status.
○Device addressing
・Output slave address after start condition from master.
・The significant 4 bits of slave address are used for recognizing a device type. The device code of this IC is fixed to '1010'.
・Next slave addresses (A2 A1 A0 --- device address) are for selecting devices, and plural ones can be used on a same bus
according to the number of device addresses.
・The most insignificant bit (R/W --- READ / WRITE) of slave address is used for designating write or read action, and is as
shown below.
Setting R / W to 0 ------- write (setting 0 to word address setting of random read)
Setting R / W to 1 ------- read
Maximum number of
connected buses
Type
Slave address
A0
A1
1
2
3
4
8
Vcc
WP
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BR24L01A-W
BR24L02-W
BR24L04-W
BR24L08-W
BR24L16-W
BR24L32-W
BR24L64-W
BR24L01A-W
BR24L02-W
BR24L04-W
BR24L08-W
BR24L16-W
BR24L32-W
BR24L64-W
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
A2
A2
A2
A2
P2
A2
A2
A1
A1
A1
P1
P1
A1
A1
A0
A0
PS
P0
P0
A0
A0
8
8
4
2
1
8
8
7
6
5
A2
SCL
SDA
GND
PS, P0～P2 are page select bits.
Note) Up to 4 units BR24L04-W, up to 2 units of BR24L08-W, and one unit of BR24L16-W can be connected.
Device address is set by 'H' and 'L' of each pin of A0, A1, and A2.
7/32
●Write Command
○Write cycle
・Arbitrary data is written to EEPROM. When to write only 1 byte, byte write is normally used, and when to write continuous data of 2 bytes or
more, simultaneous write is possible by page write cycle. The maximum number of write bytes is specified per device of each capacity. Up to
32 arbitrary bytes can be written. (In the case of BR24L32 / L64-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
P
SLAVE
ADDRESS
WORD
ADDRESS
DATA
SDA
LINE
WA
7
WA
0
1
0
1
0 A2A1A0
Note)
D7
D0
A
C
K
A
C
K
R
/
W
A
C
K
*1
*1 As for WA7, BR24L01A-W becomes Don’t care.
Fig.36 Byte write cycle (BR24L01A/02/04/08/16-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
SLAVE
ADDRESS
1st WORD
ADDRESS
2nd WORD
ADDRESS
DATA
P
SDA
LINE
WAWA
WA
1
0
1
0 A2A1A0
Note)
D7
D0
*
*
*
12 11
0
A
C
K
A
C
K
A
C
K
R
/
W
A
C
K
*1
*1 As for WA12, BR24L32-W becomes Don’t care.
Fig.37 Byte write cycle (BR24L32/64-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
P
SLAVE
ADDRESS
W ORD
ADDRESS(n)
*2
DATA(n)
DATA(n+15)
SDA
LINE
W A
7
W A
0
1
0
1
0 A2A1A0
D7
D0
D0
*1 As for WA7, BR24L01A-W becomes Don’t care.
*2 As for BR24L01A/02-W becomes (n+7).
A
C
K
R
/
W
A
C
K
A
C
K
A
C
K
Note)
*1
Fig.38 Page write cycle (BR24L01A/02/04/08/16-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
P
SLAVE
ADDRESS
1st W ORD
ADDRESS(n)
2nd W ORD
ADDRESS(n)
DATA(n)
DATA(n+31)
SDA
LINE
W A W A
W A
1
0
1
0 A2A1A0
D7
D0
D0
*
*
*
12 11
0
A
C
K
R
/
W
A
C
K
A
C
K
A
C
K
A
C
K
*1
Note)
*1 As for WA12, BR24L32-W becomes Don’t care.
Fig.39 Page write cycle (BR24L32/64-W)
・Data is written to the address designated by word address (n-th address)
・By issuing stop bit after 8bit data input, write to memory cell inside starts.
・When internal write is started, command is not accepted for tWR (5ms at maximum).
・By page write cycle, the following can be written in bulk : Up to 8 bytes ( BR24L01A-W, BR24L02-W）
: Up to 16bytes (BR24L04-W, BR24L08-W、BR24L16-W）
: Up to 32bytes (BR24L32-W, BR24L64-W）
And when data of the maximum bytes or higher is sent, data from the first byte is overwritten.
(Refer to "Internal address increment" of "Notes on page write cycle" in P9/32.)
・As for page write cycle of BR24L01A-W and BR24L02-W, after the significant 5 bits (4 significant bits in BR24L01-W) of word address are
designated arbitrarily, and as for page write command of BR24L04-W, BR24L08-W, and BR24L16-W, after page select bit (PS) of slave
address is designated arbitrarily, by continuing data input of 2 bytes or more, the address of insignificant 4 bits (insignificant 3 bit in
BR24L01A-W, and BR24L02-W) is incremented internally, and data up to 16 bytes (up to 8 bytes in BR24L01A-W and BR24L02-W) can
be written.
・As for page write cycle of BR24L32-W and BR24L64-W, after the significant 7 bits (in the case of BR24L32-W) of word address, or the
significant 8 bits (in the case of BR24L64-W) of word address are designated arbitrarily, by continuing data input of 2 byte or more, the
address of insignificant 5 bits is incremented internally, and data up to 32 bytes can be written.
Note)
*1 *2 *3
*1 In BR24L16-W, A2 becomes P2.
A1
1 0 1 0 A2 A0
*2 In BR24L08-W, BR24L16-W, A1 becomes P1.
*3 In BR24L04-W, A0 becomes PS, and in BR24L08-W
and BR24L16-W, A0 becomes P0.
Fig.40 Difference of slave address of each type
8/32
○Notes on write cycle continuous input
At STOP (stop bit),
write starts.
S
T
A
R
T
W
R
I
T
E
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
WORD
ADDRESS（ｎ）
*2
DATA(n+7)
*3
DATA(n)
SDA
LINE
*1
WA
0
WA
7
1
0
1
0 A2A1A0
D7
D0
D0
1 0 1 0
R A
/ C
W K
A
C
K
A
C
K
A
C
K
Next command
Note)
tWR(maximum : 5ms)
Command is not accepted for this period.
*1 BR24L01A-W becomes Don’t care.
Fig.41 Page write cycle
*2 BR24L04-W, BR24L08-W, and BR24L16-W become (n+15).
*3 BR24L32-W and BR24L64-W become (n+31).
Note)
*1 In BR24L16-W, A2 becomes P2.
*1 *2 *3
A1
*2 In BR24L08-W, BR24L16-W, A1 becomes P1.
*3 In BR24L04-W, A0 becomes PS, and in BR24L08-W and
in BR24L16-W, A0 becomes P0.
1 0 1 0 A2 A0
Fig.42 Difference of each type of slave address
○Notes on page write cycle
○Internal address increment
Page write mode (in the case of BR24L02-W)
List of numbers of page write
Number of
WA7 ----- WA4 WA3
WA2 WA1 WA0
8Byte
16Byte
32Byte
0
0
0
-----
-----
-----
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
Pages
Increment
BR24L04-W
BR24L08-W
BR24L16-W
Product
number
BR24L01A-W
BR24L02-W
BR24L32-W
BR24L64-W
The above numbers are maximum bytes for respective types.
Any bytes below these can be written.
0
0
0
-----
-----
-----
0
0
0
0
0
0
1
1
0
1
1
0
0
1
0
06h
In the case BR24L02-W, 1 page=8bytes, but the page
write cycle write time is 5ms at maximum for 8byte bulk write.
It does not stand 5ms at maximum × 8byte=40ms(Max.).
Significant bit is fixed.
No digit up
For example, when it is started from address 06h,
therefore, increment is made as below,
06h → 07h → 00h → 01h ---, which please note.
＊
06h･･･06 in hexadecimal, therefore, 00000110 becomes a
binary number.
○Write protect (WP) terminal
・Write protect (WP) function
When WP terminal is set Vcc (H level), data rewrite of all addresses is prohibited. When it is set GND (L level), data rewrite
of all address is enabled. Be sure to connect this terminal to Vcc or GND, or control it to H level or L level. Do not use it
open.
At extremely low voltage at power ON / OFF, by setting the WP terminal 'H', mistake write can be prevented.
During tWR, set the WP terminal always to 'L'. If it is set 'H', write is forcibly terminated.
9/32
●Read Command
○Read cycle
Data of EEPROM is read. In read cycle, there are random read cycle and current read cycle.
Random read cycle is a command to read data by designating address, and is used generally.
Current read cycle is a command to read data of internal address register without designating address, and is used when to
verify just after write cycle. In both the read cycles, sequential read cycle is available, and the next address data can be read
in succession.
W
R
I
T
E
It is necessary to input 'H' to
the last ACK.
S
T
A
R
T
S
T
A
R
T
R
E
A
D
S
T
O
P
SLAVE
ADDRESS
SLAVE
ADDRESS
W ORD
ADDRESS(n)
DATA(n)
SDA
LINE
W A
7
W A
0
1
0
1
0 A2A1A0
1
0
1
0 A2A1A0
D7
D0
A
C
K
*1
R
/
W K
A
C
A
C
K
R
/
W
A
C
K
Note)
*1 As for WA7, BR24L01A-W become Don’t care.
Fig.43 Random read cycle (BR24L01A/02/04/08/16-W)
S
T
A
R
T
W
R
I
T
E
S
T
A
R
T
R
E
A
D
S
T
O
P
SLAVE
ADDRESS
1st WORD
ADDRESS（ｎ）
2nd WORD
ADDRESS（ｎ）
SLAVE
ADDRESS
DATA(n)
SDA
LINE
WA
0
*
* * WAWA
12 11
A2
1
0
1
0
A1A0
1 0 1 0
A1A0
D7
D0
A2
R
/
W
A
C
K
A
C
K
A
C
K
R
/
W
A
C
K
A
C
K
*1
Note)
*1 As for WA12, BR24L32-W become Don’t care.
Fig.44 Random read cycle (BR24L32/64 -W)
S
R
E
A
D
S
T
O
T
A
R
T
It is necessary to input 'H' to
the last ACK.
SLAVE
ADDRESS
DATA(n)
P
SDA
LINE
1
0
1
0 A2A1A0
Note)
D7
D0
A
C
K
R
/
W
A
C
K
Fig.45 Current read cycle
S
T
A
R
R
E
A
D
S
T
O
P
SLAVE
ADDRESS
DATA(n)
DATA(n+x)
T
SDA
LINE
A2 A0
A1
1
0
1
0
D7
D0
D7
D0
R
/
W
A
C
K
A
C
K
A
C
K
A
C
K
Note）
Fig.46 Sequential read cycle (in the case of current read cycle)
・In random read cycle, data of designated word address can be read.
・When the command just before current read cycle is random read cycle, current read cycle (each including sequential read
cycle), data of incremented last read address (n)-th address, i.e., data of the (n+1)-th address is output.
・When ACK signal 'LOW' after D0 is detected, and stop condition is not sent from master (μ-COM) side, the next address
data can be read in succession.
・Read cycle is ended by stop condition where 'H' is input to ACK signal after D0 and SDA signal is started at SCL signal 'H' .
・When 'H' is not input to ACK signal after D0, sequential read gets in, and the next data is output.
Therefore, read command cycle cannot be ended. When to end read command cycle, be sure input stop condition to input
'H' to ACK signal after D0, and to start SDA at SCL signal 'H'.
・Sequential read is ended by stop condition where 'H' is input to ACK signal after arbitrary D0 and SDA is started at SCL
signal 'H'.
Note)
*1 *2 *3
*1 In BR24L16-W, A2 becomes P2.
A1
1 0 1 0 A2 A0
*2 In BR24L08-W, BR24L16-W, A1 becomes P1.
*3 In BR24L04-W, A0 becomes PS, and in BR24L08-W
and BR24L16-W, A0 becomes P0.
Fig.47 Difference of slave address of each type
10/32
●Software reset
Software reset is executed when to avoid malfunction after power on, and to reset during command input. Software reset has
several kinds, and 3 kinds of them are shown in the figure below. (Refer to Fig.48(a), Fig.48(b), and Fig.48(c).) In dummy
clock input area, release the SDA bus ('H' by pull up). In dummy clock area, ACK output and read data '0' (both 'L' level) may
be output from EEPROM, therefore, if 'H' is input forcibly, output may conflict and over current may flow, leading to
instantaneous power failure of system power source or influence upon devices.
Dummy clock×14
13
Start×2
Normal command
Normal command
SCL
SDA
2
14
1
Fig.48-(a) The case of dummy clock +START+START+ command input
Start
Start
Dummy clock×9
SCL
SDA
1
Normal command
Normal command
2
8
9
Fig.48-(b) The case of START +9 dummy clocks +START+ command input
Start×9
SCL
SDA
3
7
Normal command
Normal command
2
8
9
1
Fig.48-(c) START×9+ command input
※
Start command from START input.
●Acknowledge polling
During internal write execution, all input commands are ignored, therefore ACK is not sent back. During internal automatic
write execution after write cycle input, next command (slave address) is sent, and if the first ACK signal sends back 'L', then it
means end of write action, while if it sends back 'H', it means now in writing. By use of acknowledge polling, next command
can be executed without waiting for tWR = 5ms.
When to write continuously, R/W = 0, when to carry out current read cycle after write, slave address R/W = 1 is sent, and if
ACK signal sends back 'L', then execute word address input and data output and so forth.
During internal write,
ACK = HIGH is sent back.
First write command
S
T
A
R
T
S
T
A
R
T
S
T
A
R
T
S
T
O
P
A
C
K
H
A
C
K
H
Slave
Slave
Write command
address
address
tWR
Second write command
S
T
A
R
T
S
T
A
R
T
A
C
K
L
A
A
C
K
L
A
C
K
L
S
T
O
P
Slave
C
address
Word
Slave
Data
…
K
H
address
address
tWR
After completion of internal write,
ACK=LOW is sent back, so input next
word address and data in succession.
Fig.49 Case to continuously write by acknowledge polling
11/32
●WP valid timing (write cancel)
WP is usually fixed to 'H' or 'L', but when WP is used to cancel write cycle and so forth, pay attention to the following WP valid
timing. During write cycle execution, in cancel valid area, by setting WP='H', write cycle can be cancelled. In both byte write
cycle and page write cycle, the area from the first start condition of command to the rise of clock to taken in D0 of data(in page
write cycle, the first byte data) is cancel invalid area.
WP input in this area becomes Don't care. Set the setup time to rise of D0 taken SCL 100ns or more. The area from the rise of
SCL to take in D0 to the end of internal automatic write (tWR) is cancel valid area. And, when it is set WP='H' during tWR,
write is ended forcibly, data of address under access is not guaranteed, therefore, write it once again. (Refer to Fig.50.) After
execution of forced end by WP, standby status gets in, so there is no need to wait for tWR (5ms at maximum).
・Rise of D0 taken clock
SCL
・Rise of SDA
SCL
SDA
D1
D0
SDA
ACK
ACK
D0
Enlarged view
Enlarged view
S
A
A
C
K
L
S
T
O
P
A
C
K
L
A
C
K
L
T
A
R
T
tWR
Slave
address
Word
address
C
K
L
SDA
WP
Data
D7 D6 D5
D2 D1 D0
D4 D3
WP cancel invalid area
Write forced end
WP cancel valid area
Data is not written.
Data not guaranteed
Fig.50 WP valid timing
●Command cancel by start condition and stop condition
During command input, by continuously inputting start condition and stop condition, command can be cancelled.
(Refer to Fig. 51.)
However, in ACK output area and during data read, SDA bus may output 'L', and in this case, start condition and stop
condition cannot be input, so reset is not available. Therefore, execute software reset. And when command is cancelled by
start, stop condition, during random read cycle, sequential read cycle, or current read cycle, internal setting address is not
determined, therefore, it is not possible to carry out current read cycle in succession. When to carry out read cycle in
succession, carry out random read cycle.
SCL
SDA
1
0
1
0
Start condition
Stop condition
Fig.51 Case of cancel by start, stop condition during slave address input
12/32
●I/O peripheral circuit
○Pull up resistance of SDA terminal
SDA is NMOS open drain, so requires pull up resistance. As for this resistance value (RPU), select an appropriate value to this resistance
value from microcontroller VIL, IL, and VOL-IOL characteristics of this IC. If RPU is large, action frequency is limited. The smaller the RPU, the
larger the consumption current at action.
○Maximum value of RPU
The maximum value of RPU is determined by the following factors.
(1)SDA rise time to be determined by the capacitance (CBUS) of bus line of RPU and SDA should be tR or below.
And AC timing should be satisfied even when SDA rise time is late.
(2)The bus electric potential
A to be determined by input leak total (IL) of device connected to bus at output of 'H' to SDA bus and RPU
should sufficiently secure the input 'H' level (VIH) of microcontroller and EEPROM including recommended noise margin 0.2Vcc.
Vcc - ILRPU － 0.2Vcc ≧ VIH
Microcontroller
BR24LXX
0.8Vcc－VIH
∴
RPU ＝
IL
RPU
SDA terminal
A
Ex. ) When VCC =3V, IL=10μA, VIH=0.7 VCC
,
from (2)
IL
0.8×3－0.7×3
IL
RPU
≦
Bus line
10×10-6
capacity
CBUS
≦ 300 [kΩ]
Fig.52 I/O circuit diagram
○Minimum value of RPU
The minimum value of RPU is determined by the following factors.
(1)When IC outputs LOW, it should be satisfied that VOLMAX=0.4V and IOLMAX=3mA.
VC－VOL
V
CC－VOL
≦ IOL
∴
RPU ≦
IOL
RPU
(2)VOLMAX=0.4V should secure the input 'L' level (VIL) of microcontroller and EEPROM including recommended noise margin 0.1Vcc.
VOLMAX ≦ VIL－0.1 VCC
Ex. ) When VCC =3V, VOL=0.4V, IOL=3mA, microcontroller, EEPROM VIL=0.3Vcc
from (1)
3－0.4
3×10 -3
RPU ≧
≧
867 [Ω]
And
V
OL = 0.4 [V]
VIL = 0.3×3
= 0.9 [V]
Therefore, the condition (2) is satisfied.
○Pull up resistance of SCL terminal
When SCL control is made at CMOS output port, there is no need, but in the case there is timing where SCL becomes 'Hi-Z', add a pull up
resistance. As for the pull up resistance, one of several kΩ ~ several ten kΩ is recommended in consideration of drive performance of
output port of microcontroller.
●A0, A1, A2, WP process
○Process of device address terminals (A0,A1,A2)
Check whether the set device address coincides with device address input sent from the master side or not, and select one among plural
devices connected to a same bus. Connect this terminal to pull up or pull down, or Vcc or GND. And, pins (N, C, PIN) not used as device
address may be set to any of 'H' , 'L', and 'Hi-Z'.
Types with N.C.PIN
BR24L16/F/FJ/FV/FVT/FVM/FVJ-W
BR24L08/F/FJ/FV/FVT/FVM/FVJ/NUX-W
BR24L04/F/FJ/FV/FVT/FVM/FVJ/NUX-W
A0, A1, A2
A0, A1
A0
○Process of WP terminal
WP terminal is the terminal that prohibits and permits write in hardware manner. In 'H' status, only READ is available and WRITE of all
address is prohibited. In the case of 'L', both are available. In the case of use it as an ROM, it is recommended to connect it to pull up or Vcc.
In the case to use both READ and WRITE, control WP terminal or connect it to pull down or GND.
13/32
●Cautions on microcontroller connection
○Rs
In I2C BUS, it is recommended that SDA port is of open drain input/output. However, when to use CMOS input / output of tri
state to SDA port, insert a series resistance Rs between the pull up resistance Rpu and the SDA terminal of EEPROM. This
is controls over current that occurs when PMOS of the microcontroller and NMOS of EEPROM are turned ON simultaneously.
Rs also plays the role of protection of SDA terminal against surge. Therefore, even when SDA port is open drain input/output,
Rs can be used.
ACK
SCL
RPU
RS
SDA
'H' output of microcontroller
'L' output of EEPROM
Microcontroller
EEPROM
Over current flows to SDA line by 'H'
output of microcontroller and 'L'
output of EEPROM.
Fig.54 Input / output collision timing
Fig.53 I/O circuit diagram
○Maximum value of Rs
The maximum value of Rs is determined by the following relations.
(1)SDA rise time to be determined by the capacity (CBUS) of bus line of Rpu and SDA should be tR or below.
And AC timing should be satisfied even when SDA rise time is late.
(2)The bus electric potential A to be determined by Rpu and Rs the moment when EEPROM outputs 'L' to SDA bus should
sufficiently secure the input 'L' level (VIL) of microcontroller including recommended noise margin 0.1Vcc.
VCC
CC
OL
S
(V －V )×R
OL
CC
IL
+
V
+0.1V ≦V
A
RPU
R
PU
S
+R
RS
VOL
IL
OL
CC
V －V －0.1V
S
R
PU
R
∴
≦
×
IOL
Bus line
CC
IL
1.1V －V
capacity CBUS
Example）When VCC=3V,ꢀVIL=0.3VCC,ꢀVOL=0.4V,ꢀRPU=20kΩ,
0.3×3－0.4－0.1×3
VIL
20×103
EEPROM
S
R
from(2),
≦
×
Microcontroller
1.1×3－0.3×3
*4
Fig.55 I/O circuit diagram
1.67［kΩ］
≦
○Minimum value of Rs
The minimum value of Rs is determined by over current at bus collision. When over current flows, noises in power source
line, and instantaneous power failure of power source may occur. When allowable over current is defined as I, the following
relation must be satisfied. Determine the allowable current in consideration of impedance of power source line in set and so
forth. Set the over current to EEPROM 10mA or below.
CC
V
≦
≧
I
S
R
RPU
RS
'L' output
CC
V
S
∴ R
I
Over currentⅠ
CC
Example）When V =3V, I=10mA
'H' output
3
S
R
≧
≧
10×10-3
EEPROM
Fig.56 I/O circuit diagram
Microcontroller
300［Ω］
14/32
●I2C BUS input / output circuit
○Input (A0,A2,SCL)
Fig.57 Input pin circuit diagram
○Input / output (SDA)
Fig.58 Input / output pin circuit diagram
○Input (A1, WP)
Fig.59 Input pin circuit diagram
●Notes on power ON
At power on, in IC internal circuit and set, Vcc rises through unstable low voltage area, and IC inside is not completely reset,
and malfunction may occur. To prevent this, functions of POR circuit and LVCC circuit are equipped. To assure the action,
observe the following conditions at power on.
1. Set SDA = 'H' and SCL ='L' or 'H'
2. Start power source so as to satisfy the recommended conditions of tR, tOFF, and Vbot for operating POR circuit.
tR
VCC
Recommended conditions of tR, tOFF,Vbot
tR
tOFF
Vbot
10ms or below 10ms or longer 0.3V or below
100ms or below 10ms or longer 0.2V or below
tOFF
Vbot
0
Fig.60 Rise waveform diagram
15/32
3. Set SDA and SCL so as not to become 'Hi-Z'.
When the above conditions 1 and 2 cannot be observed, take the following countermeasures.
a) In the case when the above condition 1 cannot be observed. When SDA becomes 'L' at power on .
→Control SCL and SDA as shown below, to make SCL and SDA, 'H' and 'H'.
VCC
tLOW
SCL
SDA
After Vcc becomes stable
After Vcc becomes stable
tDH
tSU:DAT
tSU:DAT
Fig.61 When SCL= 'H' and SDA= 'L'
Fig.62 When SCL='L' and SDA='L'
b) In the case when the above condition 2 cannot be observed.
→After power source becomes stable, execute software reset(P11).
c) In the case when the above conditions 1 and 2 cannot be observed.
→Carry out a), and then carry out b).
●Low voltage malfunction prevention function
LVCC circuit prevents data rewrite action at low power, and prevents wrong write. At LVCC voltage (Typ. =1.2V) or below, it
prevent data rewrite.
●Vcc noise countermeasures
○Bypass capacitor
When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is recommended
to attach a by pass capacitor (0.1μF) between IC Vcc and GND. At that moment, attach it as close to IC as possible.
And, it is also recommended to attach a bypass capacitor between board Vcc and GND.
●Cautions on use
(1)Described 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)Terminal design
In consideration of permissible loss in actual use condition, carry out heat design with sufficient margin.
(6)Terminal to terminal shortcircuit and wrong packaging
When to package LSI onto a board, pay sufficient attention to LSI direction and displacement. Wrong packaging may
destruct LSI. And in the case of shortcircuit 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, therefore, evaluate design sufficiently.
16/32
I2C BUS Serial EEPROMs
BR24S□□□-W Series
BR24S16-W, BR24S32-W, BR24S64-W, BR24S128-W, BR24S256-W
●Description
BR24S□□□-W series is a serial EEPROM of I2C BUS interface method.
●Features
・Completely conforming to the world standard I2C BUS. All controls available by 2 ports of serial clock (SCL) and serial data
(SDA)
・ Other devices than EEPROM can be connected to the same port, saving microcontroller port.
・ 1.7～5.5V single power source action most suitable for battery use.
・ FAST MODE 400kHz at 1.7～5.5V
・ Page write mode useful for initial value write at factory shipment.
・ Highly reliable connection by Au pad and Au wire.
・ Auto erase and auto end function at data rewrite.
・ Low current consumption
At write operation (5V)
At read operation (5V)
: 0.5mA (Typ.)
: 0.2mA (Typ.)
At standby operation (5V) : 0.1μA (Typ.)
・ Write mistake prevention function
Write (write protect) function added
Write mistake prevention function at low voltage
・ SOP8/SOP-J8/SSOP-B8/TSSOP-B8/MSOP8/TSSOP-B8J/VSON008X2030 compact package
・ Data rewrite up to 1,000,000 times
・ Data kept for 40 years
・ Noise filter built in SCL / SDA terminal
・ Shipment data all address FFh
Page write
Number of pages
16Byte
32Byte
64Byte
BR24S32-W
BR24S64-W
BR24S128-W
BR24S256-W
Product number
BR24S16-W
●BR24S series
Capacity Bit format
Power source
voltage
VSON008
X2030
NUX
●
SOP8
SOP-J8
SSOP-B8 TSSOP-B8 MSOP8 TSSOP-B8J
Type
F
FJ
●
●
●
●
●
FV
●
●
●
●
FVT
●
FVM
●
FVJ
●
16Kbit
32Kbit
64Kbit
128Kbit
256Kbit
2K×8
4K×8
8K×8
BR24S16-W
BR24S32-W
BR24S64-W
1.7～5.5V
1.7～5.5V
1.7～5.5V
1.7～5.5V
1.7～5.5V
●
●
●
●
●
●
●
●
●
●
●
●
16K×8 BR24S128-W
32K×8 BR24S256-W
●
17/32
●Absolute maximum ratings (Ta=25℃)
●Memory cell characteristics (Ta=25℃,Vcc=1.7V~5.5V)
Parameter
Symbol
Vcc
Limits
－0.3～+6.5
Unit
V
Impressed voltage
Limits
Parameter
Unit
*1
*2
450(SOP8)
Min.
1,000,000
40
Typ.
Max.
－
450(SOP-J8)
Number of data rewrite
times
Data hold years *1
－
Times
Years
300(SSOP-B8)
330(TSSOP-B8)
310(MSOP8)
*3
*4
*1
Permissible
dissipation
Pd
mW
－
－
*5
*1 : Not 100% TESTED
310(TSSOP-B8J)
300(VSON008X2030)
*6
*7
●Recommended operating condition
Storage
Tstg
－65 ～ +125
℃
temperature range
Action
Parameter
Power source voltage
Input voltage
Symbol
Vcc
Limits
Unit
V
1.7～5.5
0～Vcc
Topr
－40 ～ +85
℃
temperature range
VIN
Terminal Voltage
－
－0.3～Vcc＋1.0
V
* When using at Ta=25℃ or higher, 4.5mW(*1,*2) 3.0mW(*3,*7) 3.3mW(*4) 3.1mW(*5,*6) to be
reduced per 1℃
●Electrical characteristics
(Unless otherwise specified, Ta=
●Action ｔiming characteristics
(Unless otherwise specified, Ta=
－40～+85℃, Vcc=1.7～5.5V)
－
40～+85℃, Vcc=1.7～5.5V)
Limits
Limits
Symbol
VIH1
Unit
Condition
Parameter
Symbol
Unit
Parameter
Min
Typ.
Max.
Min.
Typ.
Max.
SCL Frequency
fSCL
tHIGH
tLOW
tR
－
0.6
1.2
－
－
－
－
－
－
－
－
400
－
kHz
μs
μs
μs
μs
μs
μs
"H" Input Voltage1
0.7Vcc
－
Vcc+1.0
V
Data clock "High" time
Data clock "Low" time
SDA, SCL rise time *1
SDA, SCL fall time *1
Start condition hold time
Start condition setup time
"L" Input Voltage1
"L" Output Voltage1
"L" Output Voltage2
VIL1
VOL1
VOL2
－0.3
－
－
－
－
0.3Vcc
0.4
V
V
V
－
IOL=3.0mA , 2.5V≦Vcc≦5.5V (SDA)
IOL=0.7mA , 1.7V≦Vcc≦2.5V (SDA)
0.3
0.3
－
－
0.2
tF
－
tHD:STA
tSU:STA
0.6
0.6
Input Leakage Current
Output Leakage Current
ILI
－1
－1
－
－
1
1
μA
μA
VIN=0～Vcc
－
ILO
VOUT=0～Vcc (SDA)
Input data hold time
tHD:DAT
0
－
－
ns
Vcc=5.5V , fSCL =400kHz, tWR=5ms
Byte Write, Page Write
－
－
－
－
2.0
2.5
Input data setup time
tSU:DAT
tPD
100
0.1
0.1
0.6
1.2
－
－
－
－
－
－
－
－
－
－
－
－
0.9
－
－
－
5
ns
μs
μs
μs
μs
ms
μs
ns
μs
μs
BR24S16/32/64-W
Output data delay time
Output data hold time
ICC1
mA
Current consumption
at action
Vcc=5.5V , fSCL =400kHz, tWR=5ms
Byte Write, Page Write
tDH
BR24S128/256-W
Stop condition data setup time
Bus release time before transfer start
Internal write cycle time
Noise removal valid period (SDA,SCL terminal)
WP hold time
tSU:STO
tBUF
Vcc=5.5V , fSCL =400kHz
ICC2
－
－
－
－
0.5
2.0
mA
Random read, Current read, Sequential read
Vcc=5.5V , SDA・SCL=Vcc
A0, A1, A2=GND, WP=GND
tWR
Standby Current
ISB
μA
tI
－
0.1
－
－
－
○Radiation resistance design is not made.
tHD:WP
tSU:WP
tHIGH:WP
0
WP setup time
0.1
1.0
WP valid time
*1 : Not 100% TESTED
●Sync data input/output timing
tR
tF
tHIGH
SCL
SCL
tSU:DAT tLOW
tPD
DATA(1)
DATA(n)
tHD:STA
tBUF
tHD:DAT
SDA
(Input)
D1
D0 ACK
ACK
SDA
WP
tDH
ｔWR
SDA
Stop condition
(Output)
○Input read at the rise edge of SCL
○Data output in sync with the fall of SCL
tSU：WP
ｔHD：WP
Fig.1-(d) WP timing at write execution
Fig.1-(a) Sync data input / output timing
SCL
SDA
SCL
tSU:STA
tHD:STA
tSU:STO
DATA(n)
DATA(1)
D1 D0 ACK
ACK
SDA
WP
tWR
tHIGH:WP
START BIT
Fig.1-(b) Start - stop bit timing
STOP BIT
○At write execution, in the area from the D0 taken clock rise of the first DATA(1), to tWR, set
WP= 'LOW'.
SCL
SDA
○By setting WP "HIGH" in the area, write can be cancelled.
When it is set WP = 'HIGH' during tWR, write is forcibly ended, and data of address under access
is not guaranteed, therefore write it once again.
D0
WRITE DATA(n)
ACK
tWR
STOP
CONDITION
START
CONDITION
Fig.1-(e) WP timing at write cancel
Fig.1-(c) Write cycle timing
18/32
●Block diagram
*2A0
1
8
Vcc
16Kbit～256Kbit EEPROM array
*1
11bit
12bit
13bit
14bit
15bit
8bit
*1 11bit
12bit
13bit
14bit
15bit
Data
register
Adddress
decoder
Slave - word
address register
*2A1
*2 A2
GND
2
3
4
7
6
5
WP
START
STOP
SCL
SDA
Control circuit
ACK
High voltage
generating circuit
Power source
voltage detection
＊1 11bit: BR24S16-W
12bit: BR24S32-W
13bit: BR24S64-W
14bit: BR24S128-W
15bit: BR24S256-W
＊2 A0, A1, A2= Don’t use: BR24S16-W
Fig.2 Block diagram
●Pin assignment and description
Terminal Input/
name Output
Function
BR24S32/64/128/256-W
Vcc
8
1
2
3
A0
A1
BR24S16-W
Don't use
Don't use
Don't use
Slave address setting
Slave address setting
Slave address setting
A0
A1
Input
Input
Input
-
WP
7
6
BR24S16-W
BR24S32-W
BR24S64-W
BR24S128-W
BR24S256-W
A2
GND
Reference voltage of all input / output, 0V.
SCL
A2
Input /
Output
Input
Input
-
Slave and word address,
SDA
Serial data input serial data output
4
5
SDA
GND
SCL
WP
Vcc
Serial clock input
Write protect terminal
Connect the power source.
●Characteristic data (The following values are Typ. ones.)
6
5
4
3
2
1
0
6
5
4
3
2
1
0
1
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=-40℃
Ta=25℃
Ta=85℃
0.8
Ta=85℃
0.6
SPEC
0.4
SPEC
0.2
SPEC
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
8
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
L OUTPUT CURRENT : IOL[mA]
Fig.3ꢀ'H' input voltage VIH
Fig.4ꢀ'L' input voltage VIL
Fig.5 'L' output voltage VOL-IOL(Vcc=1.7V)
(A0,A1,A2,SCL,SDA,WP)
(A0,A1,A2,SCL,SDA,WP)
1
0.8
0.6
0.4
0.2
0
1.2
1
1.2
SPEC
SPEC
1
0.8
0.6
0.4
0.2
0
0.8
0.6
0.4
0.2
0
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
L OUTPUT CURRENT : IOL[mA]
SUPPLYVOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.8ꢀOutput leak current ILO(SDA)
Fig.7ꢀInput leak current ILI
Fig.6ꢀ'L' output voltage VOL-IOL(Vcc=2.5V)
(A0,A,A2,SCL,WP)
19/32
●Characteristic data (The following values are Typ. ones.)
2.5
2
3.5
3
0.6
0.5
0.4
0.3
0.2
0.1
0
SPEC
SPEC
SPEC
2.5
2
1.5
1
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
1.5
1
0.5
0
0.5
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.9 Current consumption at WRITE operation ICC
(fSCL=400kHz BR24S16/32/64-W)
1
Fig.10ꢀCurrent consumption at WRITE operation Icc1
Fig.11 Current consumption at READ operation ICC
(fSCL=400kHz)
2
(fSCL=400kHz BR24S128/256-W)
10000
5
2.5
SPEC
SPEC
2
1000
100
10
4
SPEC
1.5
3
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
1
2
Ta=25℃
Ta=85℃
0.5
1
1
0
0
0.1
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.13ꢀSCL frequency fSCL
Fig.14 Data clock High Period tHIGH
Fig.12ꢀStanby operation ISB
5
4
3
2
1
0
5
4
3
2
1
0
5.9
4.9
SPEC
SPEC
3.9
Ta=-40℃
Ta=25℃
Ta=85℃
2.9
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
1.9
SPEC
0.9
-0.1
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.15 Data clock Low PeriodꢀtLOW
Fig.17ꢀStart Condition Setup TimeꢀtSU : STA
Fig.16 Start Condition Hold Time tHD : STA
50
300
200
100
0
50
SPEC
SPEC
0
-50
0
-50
SPEC
Ta=-40℃
Ta=25℃
Ta=85℃
-100
-150
-200
-100
-150
-200
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
-100
-200
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.18ꢀInput Data Hold Time tHD : DAT（HIGH）
Fig.19ꢀInput Data Hold Time ｔHD : DAT(LOW）
Fig.20ꢀInput Data Setup Time ｔSU: DAT(HIGH)
300
200
100
0
4
3
2
1
0
4
3
2
1
0
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC
SPEC
SPEC
Ta=-40℃
Ta=25℃
Ta=85℃
-100
-200
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.21ꢀInput Data setup time tSU : DAT(LOW)
Fig.22ꢀ'L' Data output delay time tPD
0
Fig.23 'H' Data output delay time ｔPD
1
20/32
●Characteristic data (The following values are Typ. ones.)
5
1
0.8
0.6
0.4
0.2
0
6
SPEC
SPEC
Ta=-40℃
Ta=25℃
Ta=85℃
5
4
3
2
1
0
4
3
2
1
0
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC
Ta=-40℃
Ta=25℃
Ta=85℃
0
1
2
3
4
5
6
0
1
2
3
4
SUPPLY VOLTAGE : Vcc[V]
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
Fig.24 BUS open time before transmissionꢀｔBUF
Fig.25 Internal writing cycle timeꢀｔWR
Fig.26 Noise reduction efection time tl（SCL H）
0.6
0.6
0.6
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
0.5
0.4
0.3
0.2
0.1
0
0.5
0.4
0.3
0.2
0.1
0
0.5
0.4
0.3
0.2
0.1
0
Ta=-40℃
Ta=25℃
Ta=85℃
SPEC
SPEC
SPEC
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
2
4
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLTAGE : Vcc[V]
SUPPLY VOLATGE : Vcc[V]
Fig.28ꢀNoise resuction efecctive timeꢀｔｌ（SDA H）
Fig.27ꢀNoise reduction efective timeꢀtl（SCL L）
Fig.29 Noise reduction efective time t SDA L
（
）
l
1.2
1
0.2
0.1
SPEC
SPEC
0
0.8
0.6
0.4
0.2
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
Ta=-40℃
Ta=25℃
Ta=85℃
Ta=-40℃
Ta=25℃
Ta=85℃
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE : Vcc[V]
SUPPLYVOLTAGE : Vcc[V]
Fig.30 WP setup time tSU : WP
Fig.31 WP efective time
tHIGH : WP
21/32
●I2C BUS communication
○I2C BUS data communication
I2C BUS data communication starts by start condition input, and ends by stop condition input. Data is always 8bit long, and
acknowledge is always required after each byte.
I2C BUS carries out data transmission with plural devices connected by 2 communication lines of serial data (SDA) and serial
clock (SCL).
Among devices, there are “master” that generates clock and control communication start and end, and “slave” that is
controlled by addresses peculiar to devices.
EEPROM becomes “slave”. And the device that outputs data to bus during data communication is called “transmitter”, and
the device that receives data is called “receiver”.
SDA
1-7
1-7
1-7
8
9
8
9
8
9
SCL
S
P
START ADDRESS R/W
condition
ACK
DATA
ACK
DATA
ACK
STOP
condition
Fig.32 Data transfer timing
○Start condition (start bit recognition)
・Before executing each command, start condition (start bit) where SDA goes from 'HIGH' down to 'LOW' when SCL is 'HIGH' is
necessary.
・This IC always detects whether SDA and SCL are in start condition (start bit) or not, therefore, unless this condition is satisfied,
any command is executed.
○Stop condition (stop bit recognition)
・Each command can be ended by SDA rising from 'LOW' to 'HIGH' when stop condition (stop bit), namely, SCL is 'HIGH'
○Acknowledge (ACK) signal
・This acknowledge (ACK) signal is a software rule to show whether data transfer has been made normally or not. In master
and slave, the device (μ-COM at slave address input of write command, read command, and this IC at data output of read
command) at the transmitter (sending) side releases the bus after output of 8bit data.
・The device (this IC at slave address input of write command, read command, and μ-COM at data output of read command)
at the receiver (receiving) side sets SDA 'LOW' during 9 clock cycles, and outputs acknowledge signal (ACK signal) showing
that it has received the 8bit data.
・This IC, after recognizing start condition and slave address (8bit), outputs acknowledge signal (ACK signal) 'LOW'.
・Each write action outputs acknowledge signal) (ACK signal) 'LOW', at receiving 8bit data (word address and write data).
・Each read action outputs 8bit data (read data), and detects acknowledge signal (ACK signal) 'LOW'.
・When acknowledge signal (ACK signal) is detected, and stop condition is not sent from the master (μ-COM) side, this IC
continues data output. When acknowledge signal (ACK signal) is not detected, this IC stops data transfer, and recognizes
stop condition (stop bit), and ends read action. And this IC gets in standby status.
○Device addressing
・Output slave address after start condition from master.
・The significant 4 bits of slave address are used for recognizing a device type. The device code of this IC is fixed to '1010'.
・Next slave addresses (A2 A1 A0 --- device address) are for selecting devices, and plural ones can be used on a same bus
according to the number of device addresses.
・The most insignificant bit (R/W --- READ/WRITE) of slave address is used for designating write or read action, and is as
shown below.
Setting R/W to 0 --- write (setting 0 to word address setting of random read)
Setting R/W to 1 --- read
Vcc
8
1
2
3
A0
A1
Maximum number of
connected buses
1
Type
Slave address
WP
7
6
BR24S16-W
BR24S32-W
BR24S64-W
BR24S128-W
BR24S256-W
BR24S16-W
1 0 1 0 P2
1 0 1 0 A2
P1
A1
P0
A0
R/W
R/W
BR24S32-W,BR24S64-W,
BR24S128-W,BR24S256-W
SCL
A2
8
4
5
SDA
GND
P0～P2 are page select bits.
Note)Up to 1 units of BR24S16-W, and up to 8 units of BR24S32/64/128/256-W can be connected.
Device address is set by 'H' and 'L' of each pin of A0, A1, and A2.
22/32
●Write Command
○Write cycle
・Arbitrary data is written to EEPROM. When to write only 1 byte, byte write normally used, and when to write continuous data
of 2 bytes or more, simultaneous write is possible by page write cycle. The maximum number of write bytes is specified per
device of each capacity.
Up to 64 arbitrary bytes can be written. (In the case of BR24S128/256-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
P
SLAVE
ADDRESS
WORD
ADDRESS
DATA
SDA
LINE
WA
7
WA
0
1
0
1
0 A2A1A0
Note)
D7
D0
A
C
K
A
C
K
R
/
W
A
C
K
Fig.33 Byte write cycle (BR24S16-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
SLAVE
ADDRESS
1st WORD
ADDRESS
2nd WORD
ADDRESS
DATA
P
*1 As for WA12, BR24S32-W becomes Don't care.
As for WA13, BR24S32/64-W becomes Don't care.
As for WA14, BR24S32/64/128-W becomes Don't care.
SDA
LINE
WAWA WAWA
14 13 12 11
WA
0
＊
1
0
1
0 A2A1A0
Note)
D7
D0
A
C
K
A
C
K
A
C
K
R
/
W
A
C
K
*1
Fig.34 Byte write cycle (BR24S32/64/128/256-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
P
SLAVE
ADDRESS
W ORD
ADDRESS(n)
*
DATA(n)
DATA(n+15)
SDA
LINE
W A
7
W A
0
1
0
1
0 A2A1A0
D7
D0
D0
A
C
K
R
/
W
A
C
K
A
C
K
A
C
K
Note)
Fig.35 Page write cycle (BR24S16-W)
S
T
A
R
T
W
R
I
T
E
S
T
O
P
*2
DATA(n+31)
SLAVE
ADDRESS
1st W ORD
ADDRESS(n)
2nd W ORD
ADDRESS(n)
DATA(n)
*1 As for WA12, BR24S32-W becomes Don't care.
As for WA13, BR24S32/64-W becomes Don't care.
As for WA14, BR24S32/64/128-W becomes Don't care.
SDA
LINE
W A W AW A W A
14 13 12 11
W A
＊
1
0
1
0 A2A1A0
D7
D0
D0
0
A
C
K
R
/
W
A
C
K
A
C
K
A
C
K
A
C
K
*1
Note)
*2 As for BR24S128/256-W becomes (n+63).
Fig.36 Page write cycle (BR24S32/64/128/256-W)
・Data is written to the address designated by word address (n-th address).
・By issuing stop bit after 8bit data input, write to memory cell inside starts.
・When internal write is started, command is not accepted for tWR (5ms at maximum).
・By page write cycle, the following can be written in bulk: Up to 16 bytes (BR24S16-W)
: Up to 32 bytes (BR24S32-W, BR24S64-W)
: Up to 64 bytes (BR24S128-W, BR24S256-W)
And when data of the maximum bytes or higher is sent, data from the first byte is overwritten.
(Refer to "Internal address increment of "Notes on page write cycle" in P24/32.)
・As for page write command of BR24S16-W, after page select bit(PS) of slave address is designated arbitrarily, by continuing
data input of 2 bytes or more, the address of insignificant 4 bits is incremented internally, and data up to 16 bytes can be written.
・As for page write cycle of BR24S32-W and BR24S64-W , after the significant 7 bits (in the case of BR24S32-W) of word address,
or the significant 8 bits (in the case of BR24S64-W) of word address are designated arbitrarily, by continuing data input of 2 bytes
or more, the address of insignificant 5 bits is incremented internally, and data up to 32 bytes can be written.
・As for page write cycle of BR24S128-W and BR24S256-W, after the significant 9 bit (in the case of BR24S128-W) of word
address, or the significant 10bit (in the case of BR24S256-W) of word address are designated arbitrarily, by continuing data input
of 64 bytes or more.
Note)
*1 In BR24S16-W, A2 becomes P2
*2 In BR24S16-W, A1 becomes P1
*3 In BR24S16-W, A0 becomes P0
*1 *2 *3
A1
1 0 1 0 A2 A0
Fig.37 Difference of slave address each type
23/32
○Notes on write cycle continuous input
At STOP (stop bit)
write starts.
S
T
A
R
T
W
R
I
T
E
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
WORD
ADDRESS（ｎ）
DATA(n)
DATA(n+15)
SDA
LINE
WA
0
WA
7
P2P1P0
1
0
1
0
D7
D0
D0
1 0 1 0
R A
/ C
W K
A
C
K
A
C
K
A
C
K
Next command
tWR(maximum：5ms)
Command is not accepted for this
period.
Fig.38
Page write cycle(BR24S16-W)
At STOP (stop bit)
write starts.
S
T
A
R
W
R
I
T
E
S
T
A
R
T
S
T
O
*1 As for WA12, BR24S32-W becomes Don't care.
As for WA13, BR24S32/64-W becomes Don't care.
As for WA14, BR24S32/64/128-W becomes Don't care.
*2
SLAVE
ADDRESS
1st W ORD
ADDRESS(n)
2nd W ORD
ADDRESS(n)
DATA(n)
DATA(n+31)
SDA
LINE
P
T
W A W AW A W A
14 13 12 11
W A
＊
1 0 1 0
1
0
1
0 A2A1A0
D7
D0
D0
0
*2 As for BR24S128/256-W becomes (n+63).
A
C
K
Next command
R
/
W
A
C
K
A
C
K
A
C
K
A
C
K
*1
tW R(maximum
: 5ms)
Command is not accepted for
this period.
Fig.39
○Notes on page write cycle
List of numbers of page write
Page write cycle(BR24S32/64/128/256-W)
○Internal address increment
Page write mode (in the case of BR24S16-W)
Number of pages
16Byte
32Byte
64Byte
WA7 ----- WA4 WA3 WA2 WA1 WA0
BR24S32-W BR24S128-W
BR24S64-W BR24S256-W
0
0
0
-----
-----
-----
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
Product number
BR24S16-W
Increment
The above numbers are maximum bytes for respective types. Any bytes
below these can be written.
In the case of BR24S256-W, 1 page = 64bytes, but the page write cycle write time is
5ms at maximum for 64byte bulk write.
It does not stand 5ms at maximum × 64byte = 320ms(Max.).
0
0
0
-----
-----
-----
0
0
0
1
1
0
1
1
0
1
1
0
0
1
0
0Eh
Significant bit is fixed.
No digit up
For example, when it is started from address 0Eh,
therefore, increment is made as below,
0Eh→0Fh→00h→01h･･･, which please note.
* 0Eh･･･16 in hexadecimal, therefore, 00001110 becomes a binary
number.
○Write protect (WP) terminal
・Write protect (WP) function
When WP terminal is set Vcc (H level), data rewrite of all address is prohibited. When it is set GND (L level), data rewrite of all
address is enabled. Be sure to connect this terminal to Vcc or GND, or control it to H level or L level. Do not use it open.
At extremely low voltage at power ON/OFF, by setting the WP terminal 'H', mistake write can be prevented.
During tWR, set the WP terminal always to 'L'. If it is set 'H', write is forcibly terminated.
24/32
●Read Command
○Read cycle
Data of EEPROM is read. In read cycle, there are random read cycle and current read cycle.
Random read cycle is a command to read data by designating address, and is used generally.
Current read cycle is a command to read data of internal address register without designating address, and is used when to
verify just after write cycle. In both the read cycles, sequential read cycle is available, and the next address data can be read
in succession.
W
R
I
T
E
S
T
A
R
T
S
T
A
R
T
R
E
A
D
S
T
O
SLAVE
ADDRESS
SLAVE
ADDRESS
W ORD
ADDRESS(n)
It is necessary to input 'H'
to the last ACK.
DATA(n)
P
SDA
LINE
W A
7
W A
0
1
0
1
0 A2A1A0
1
0
1
0 A2A1A0
D7
D0
A
C
K
R A
A
C
K
R
/
W
A
C
K
Note)
/
C
W K
Fig.40 Random read cycle (BR24S16-W)
S
T
A
R
T
W
R
I
T
E
S
T
A
R
T
R
E
A
D
S
T
O
P
SLAVE
ADDRESS
1st WORD
ADDRESS（ｎ）
2nd WORD
ADDRESS（ｎ）
SLAVE
ADDRESS
DATA(n)
SDA
LINE
WA
0
*1 As for WA12, BR24S32-W become Don't care.
As for WA13, BR24S32/64-W become Don't care.
As for WA14, R24S32/64/128-W become Don't care.
WAWAWAWA
＊
14 13 12 11
A2
1 0 1 0
A1A0
1 0 1 0
A1A0
D7
D0
A2
R
/
W
A
C
K
A
C
K
A
C
K
R
A
C
K
A
C
K
*1
Note)
/
W
Fig.41 Random read cycle (BR24S32/64/128/256-W)
S
R
E
A
D
S
T
O
T
A
R
T
It is necessary to input 'H'
to the last ACK.
SLAVE
ADDRESS
DATA(n)
P
SDA
LINE
1
0
1
0 A2A1A0
D7
D0
A
C
K
R
/
W
A
C
K
Note)
Fig.42 Current read cycle
S
T
A
R
T
R
E
A
S
T
O
P
SLAVE
ADDRESS
DATA(n)
DATA(n+x)
D
SDA
LINE
A2 A0
A1
1
0
1
0
D7
D0
D7
D0
R
/
W
A
C
K
A
C
K
A
C
K
A
C
K
Note）
Fig.43 Sequential read cycle (in the case of current read cycle)
・In random read cycle, data of designated word address can be read.
・When the command just before current read cycle is random read cycle, current read cycle (each including sequential read
cycle), data of incremented last read address (n)-th address, i.e., data of the (n+1)-th address is output.
・When ACK signal 'LOW' after D0 is detected, and stop condition is not sent from master (μ-COM) side, the next address data
can be read in succession.
・Read cycle is ended by stop condition where 'H' is input to ACK signal after D0 and SDA signal is started at SCL signal 'H'.
・When 'H' is not input to ACK signal after D0, sequential read gets in, and the next data is output.
Therefore, read command cycle cannot be ended. When to end read command cycle, be sure input stop condition to input 'H'
to ACK signal after D0, and to start SDA at SCL signal 'H'.
・Sequential read is ended by stop condition where 'H' is input to ACK signal after arbitrary D0 and SDA is started at SCL signal
'H'.
Note)
*1 *2 *3
*1 BR24S16-W A2 becomes P2.
*2 BR24S16-W A1 becomes P1.
*3 BR24S16-W A0 becomes P0.
A1
1 0 1 0 A2 A0
Fig.44 Difference of slave address of each type
25/32
●Software reset
Software reset is executed when to avoid malfunction after power on, and to reset during command input. Software reset has
several kinds, and 3 kids of them are shown in the figure below. (Refer to Fig.45(a), Fig.45(b), Fig.45(c).) In dummy clock
input area, release the SDA bus ('H' by pull up). In dummy clock area, ACK output and read data '0' (both 'L' level) may be
output from EEPROM, therefore, if 'H' is input forcibly, output may conflict and over current may flow, leading to instantaneous
power failure of system power source or influence upon devices.
Dummy clock×14
13
Start×2
Normal command
Normal command
2
14
1
SCL
SDA
Fig.45-(a) The case of 14 Dummy clock + START + START+ command inpu
Start
Start
Dummy clock×9
2
1
Normal command
Normal command
8
9
SCL
SDA
Fig.45-(b) The case of START+9 Dummy clock + START + command input
Start×9
Normal command
Normal command
3
7
2
8
9
1
SCL
SDA
Fig.45-(c) START × 9 + command input
* Start command from START input.
●Acknowledge polling
During internal write, all input commands are ignored, therefore ACK is not sent back. During internal automatic write
execution after write cycle input, next command (slave address) is sent, and if the first ACK signal sends back 'L', then it
means end of write action, while if it sends back 'H', it means now in writing. By use of acknowledge polling, next command
can be executed without waiting for tWR = 5ms.
When to write continuously, R/W = 0, when to carry out current read cycle after write, slave address R/W = 1 is sent, and if
ACK signal sends back 'L', then execute word address input and data so forth.
During internal write,
First write command
ACK = HIGH is sent back.
S
T
S
S
T
A
R
T
A
C
K
H
Slave
address
A
S
T
O
P
T
Slave
C
A
A
R
T
Write command
…
K
H
address
R
T
tWR
Second write command
S
S
T
A
R
T
A
C
K
L
A
S
T
O
P
A
A
C
K
L
Slave
Word
T
A
R
T
Slave
C
K
L
C
K
H
Data
…
address
address
address
tWR
After completion of internal
write, ACK=LOW is sent back,
so input next word address and
data in succession.
Fig.46 Case to continuously write by acknowledge polling
26/32
●WP valid timing (write cancel)
WP is usually fixed to 'H' or 'L', but when WP is used to cancel write cycle and so forth, pay attention to the following WP valid
timing. During write cycle execution, in cancel valid area, by setting WP='H', write cycle can be cancelled. In both byte write
cycle and page write cycle, the area from the first start condition of command to the rise of clock to taken in D0 of data(in page
write cycle, the first byte data) is cancel invalid area.
WP input in this area becomes Don't care. Set the setup time to rise of D0 taken 100ns or more. The area from the rise of SCL
to take in D0 to the end of internal automatic write (tWR) is cancel valid area. And, when it is set WP='H' during tWR, write is
ended forcibly, data of address under access is not guaranteed, therefore, write it once again.(Refer to Fig.47.) After
execution of forced end by WP standby status gets in, so there is no need to wait for tWR (5ms at maximum).
・Rise of D0 taken clock
SCL
SDA
SCL
SDA
・Rise of SDA
D1
D0
ACK
D0
ACK
Enlarged view
Enlarged view
S
A
A
S
A
C
K
L
A
C
K
L
T
A
R
T
Slave
Word
tWR
C
K
L
C
K
L
T
O
P
SDA
WP
Data
D7 D6 D5
D2 D1 D0
D4 D3
address
address
WP cancel invalid area
Write forced end
Data not guaranteed
WP cancel valid area
Data is not written.
Fig.47 WP valid timing
●Command cancel by start condition and stop condition
During command input, by continuously inputting start condition and stop condition, command can be cancelled. (Refer to Fig.
48.)
However, in ACK output area and during data read, SDA bus may output 'L', and in this case, start condition and stop
condition cannot be input, so reset is not available. Therefore, execute software reset. And when command is cancelled by
start, stop condition, during random read cycle, sequential read cycle, or current read cycle, internal setting address is not
determined, therefore, it is not possible to carry out current read cycle in succession. When to carry out read cycle in
succession, carry out random read cycle.
SCL
SDA
1
0
1
0
Start condition
Stop condition
Fig.48 Case of cancel by start, stop condition during slave address input
27/32
●I/O peripheral circuit
○Pull up resistance of SDA terminal
SDA is NMOS open drain, so requires pull up resistance. As for this resistance value (RPU), select an appropriate value to this resistance value
from microcontroller VIL, IL, and VOL-IOL characteristics of this IC. If RPU is large, action frequency is limited. The smaller the RPU, the larger the
consumption current at action.
○Maximum value of RPU
The maximum value of RPU is determined by the following factors.
(1)SDA rise time to be determined by the capacitance (CBUS) of bus line of RPU and SDA should be tR or below.
And AC timing should be satisfied even when SDA rise time is late.
(2)The bus electric potential A to be determined by input leak total (IL) of device connected to bus output of 'H' to SDA bus and RPU should
sufficiently secure the input 'H' level (VIH) of microcontroller and EEPROM including recommended noise margin 0.2Vcc.
Vcc － ILRPU － 0.2Vcc ≧ VIH
Microcontroller
BR24SXX
CC
IH
0.8V －V
PU
R
∴
≦
IL
RPU
Eｘ.) When Vcc = 3V, IL=10μA, VIH = 0.7Vcc,
SDA terminal
A
from(2)
0.8×3－0.7×3
PU
R
≦
≦
IL
10×10-6
IL
Bus line
capacity
［kΩ］
300
CBUS
○Minimum value of RPU
The minimum value of RPU is determined by the following factors.
(1)When IC outputs LOW, it should be satisfied that VOLMAX=0.4V and IOLMAX=3mA.
Fig.49 I/O circuit diagram
CC
OL
－V
PU
V
OL
≦ I
R
CC
OL
V
－V
OL
PU
∴ R
≧
I
(2)VOLMAX=0.4V should secure the input 'L' level (VIL) of microcontroller and EEPROM including recommended noise margin 0.1Vcc.
VOLMAX ≦ VIL-0.1 Vcc
Ex.) When Vcc= 3V, VOL0.4V, IOL=3mA, microcontroller, EEPROM VIL=0.3Vcc
from(1),
3－0.4
3×10
RPU
≧
≧
-3
［Ω］
867
And
VOL=0.4［V］
VIL=0.3×3
=0.9［V］
Therefore, the condition (2) is satisfied.
○Pull up resistance of SCL terminal
When SCL control is made at CMOS output port, there is no need, but in the case there is timing where SCL becomes 'Hi-Z', add a pull up
resistance. As for the pull up resistance, one of several kΩ ~ several ten kΩ is recommended in consideration of drive performance of output
port of microcontroller.
●A0, A1, A2, WP process
○Process of device address terminals (A0,A1,A2)
Check whether the set device address coincides with device address input sent from the master side or not, and select one among plural
devices connected to a same bus. Connect this terminal to pull up or pull down, or Vcc or GND. And, pins(Don't use PIN) not used as device
address may be set to any of 'H' , 'L', and 'Hi-Z'.
Types with Don't use PIN
BR24S16/F/FJ/FV/FVT/FVM/FVJ/NUX-W
A0, A1, A2
○Process of WP terminal
WP terminal is the terminal that prohibits and permits write in hardware manner. In 'H' status, only READ is available and WRITE of all address
is prohibited. In the case of 'L', both are available. In the case of use it as an ROM, it is recommended to connect it to pull up or Vcc. In the case
to use both READ and WRITE, control WP terminal or connect it to pull down or GND.
28/32
●Cautions on microcontroller connection
○Rs
In I2C BUS, it is recommended that SDA port is of open drain input/output. However, when to use CMOS input / output of tri
state to SDA port, insert a series resistance Rs between the pull up resistance Rpu and the SDA terminal of EEPROM. This is
controls over current that occurs when PMOS of the microcontroller and NMOS of EEPROM are turned ON simultaneously. Rs
also plays the role of protection of SDA terminal against surge. Therefore, even when SDA port is open drain input/output, Rs
can be used.
ACK
SCL
RPU
RS
SDA
'H' output of microcontroller
'L' output of EEPROM
Over current flows to SDA line by 'H'
output of microcontroller and 'L' output
of EEPROM.
Microcontroller
Fig.50 I/O circuit diagram
○Maximum value of Rs
EEPROM
Fig.51 Input/output collision timing
The maximum value of Rs is determined by following relations.
(1)SDA rise time to be determined by the capacity (CBUS) of bus line of Rpu and SDA shoulder be tR or below.
And AC timing should be satisfied even when SDA rise time is late.
(2)The bus electric potential A to be determined by Rpu and Rs the moment when EEPROM outputs 'L' to SDA bus should
sufficiently secure the input 'L' level (VIL) of microcontroller including recommended noise margin 0.1Vcc.
VCC
CC
OL
S
(V －V )×R
OL
CC
IL
+
V
+0.1V ≦V
A
PU
R
S
+R
RPU
RS
VOL
IL
OL
CC
V －V －0.1V
S
R
PU
R
∴
≦
×
CC
IL
1.1V －V
IOL
Bus line
capacity CBUS
Example）When VCC=3V,ꢀVIL=0.3VCC,ꢀVOL=0.4V,ꢀRPU=20kΩ,
0.3×3－0.4－0.1×3
20×103
VIL
S
R
from(2),
≦
×
EEPROM
Microcontroller
1.1×3－0.3×3
Fig.52 I/O circuit diagram
1.67［kΩ］
≦
○Maximum value of Rs
The minimum value of Rs is determined by over current at bus collision. When over current flows, noises in power source line,
and instantaneous power failure of power source may occur. When allowable over current is defined as I, the following relation
must be satisfied. Determine the allowable current in consideration of impedance of power source line in set and so forth. Set
the over current to EEPROM 10mA or below.
CC
V
≦
≧
I
S
R
RPU
RS
'L' output
CC
V
S
∴ R
I
Over currentⅠ
CC
Example）When V =3V, I=10mA
'H' output
3
S
R
≧
≧
10×10-3
EEPROM
Fig.53 I/O circuit diagram
Microcontroller
300［Ω］
29/32
●I2C BUS input / output circuit
○Input (A0, A1, A2, SCL, WP)
Fig.54 Input pin circuit diagram
○Input/Output (SDA)
Fig.55 Input /output pin circuit diagram
30/32
●Notes on power ON
At power on, in IC internal circuit and set, Vcc rises through unstable low voltage area, and IC inside is not completely reset,
and malfunction may occur. To prevent this, functions of POR circuit and LVCC circuit are equipped. To assure the action,
observe the following condition at power on.
1. Set SDA = 'H' and SCL ='L' or 'H'
2. Start power source so as to satisfy the recommended conditions of tR, tOFF, and Vbot for operating POR circuit.
tR
Recommended conditions of tR,tOFF,Vbot
VCC
tR
tOFF
Vbot
10ms or below 10ms or longer 0.3V or below
100ms or below 10ms or longer 0.2V or below
tOFF
Vbot
0
Fig.56 Rise waveform diagram
3. Set SDA and SCL so as not to become 'Hi-Z'.
When the above conditions 1 and 2 cannot be observed, take the following countermeasures.
a) In the case when the above conditions 1 cannot be observed. When SDA becomes 'L' at power on .
→Control SCL and SDA as shown below, to make SCL and SDA, 'H' and 'H'.
VCC
tLOW
SCL
SDA
After Vcc becomes stable
After Vcc becomes stable
tDH tSU:DAT
Fig.57 When SCL='H' and SDA='L'
tSU:DAT
Fig.58 When SCL='H' and SDA='L'
b) In the case when the above condition 2 cannot be observed.
→After power source becomes stable, execute software reset(P26).
c) In the case when the above conditions 1 and 2 cannot be observed.
→Carry out a), and then carry out b).
●Low voltage malfunction prevention function
LVCC circuit prevents data rewrite action at low power, and prevents wrong write.
At LVCC voltage (Typ. =1.2V) or below, it prevent data rewrite.
●Vcc noise countermeasures
○Bypass capacitor
When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is recommended
to attach a by pass capacitor (0.1μF) between IC Vcc and GND. At that moment, attach it as close to IC as possible.
And, it is also recommended to attach a bypass capacitor between board Vcc and GND.
●Cautions on use
(1)Described 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)Terminal design
In consideration of permissible loss in actual use condition, carry out heat design with sufficient margin.
(6)Terminal to terminal shortcircuit and wrong packaging
When to package LSI onto a board, pay sufficient attention to LSI direction and displacement. Wrong packaging may
destruct LSI. And in the case of shortcircuit 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, therefore, evaluate design sufficiently.
31/32
●Selection of order type
B R
2 4
S
2 5
6
F
W
E 2
Double cell
Package
F:SOP8
FJ:SOP-J8
FV : SSOP-B8
Package specifications
E2：reel shape emboss taping
TR：reel shape emboss taping
Operating
Capacity
01=1K 16=16K
02=2K 32=32K
04=4K 64=64K
08=8K 128=128K
256=256K
BUS type
ROHM type
name
24：I2C
temperature
L:-40℃～+85℃
S:-40℃～+85℃
FVT : TSSOP-B8
FVM : MSOP8
FVJ : TSSOP-B8J
NUX : VSON008X2030
●Package specifications
SOP8/SOP-J8/SSOP-B/TSSOP-B8/TSSOP-B8J
〈Package specifications 〉
〈External appearance〉
Package type
Emboss taping
SOP8
SOP-J8
SSOP-B8
TSSOP-B8
3.0±0.1
TSSOP-B8J
Package quantity 2500pcs(SOP8/SOP-J8/SSOP-B8/TSSOP-B8J)
3000pcs(TSSOP-B8)
5.0±0.2
3.0 0.2
4.9 0.2
8
5
8
5
4
Package direction E2
8
5
8
7
6
5
(When the reel is gripped by the left hand,
and the tape is pulled out by the right hand,
No.1 pin of the product is at the left top.）
1
4
0.15 0.1
1
2
3
4
+0.05
0.145
-0.03
1
4
0.2 0.1
0.1
0.595
1
+0.1
-0.05
0.17
0.1
0.22 0.1
(0.52) 0.65
0.08
S
1.27
+0.05
-0.04
1.27
0.42±0.1
0.245
0.65
0.42 0.1
Pulling side
(Unit:mm)
Reel
Pin No.1
※For ordering, specify a number of multiples of the package quantity.
MSOP8
〈External appearance〉
〈Package specifications 〉
Package type Emboss taping
2.9 0.1
8
5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Package quantity 3000pcs
Package direction TR
1
4
+0.05
−0.03
0.145
0.475
Pulling side
+0.05
0.22 −0.04
(When the reel is gripped by the left hand,
and the tape is pulled out by the right hand,
No.1 pin of the product is at the right top.）
Reel
M
0.08
0.65
0.08 S
Pin No.1
(Unit:mm)
※For ordering, specify a number of multiples of the package quantity.
VSON008X2030
〈External appearance〉
〈Package specifications 〉
Package type
Emboss taping
Package quantity 4000pcs
Package direction TR
(When the reel is gripped by the left hand,
and the tape is pulled out by the right hand,
No.1 pin of the product is at the right top.）
Pulling side
Reel
Pin No.1
(Unit:mm)
※ For ordering, specify a number of multiples of the package quantity.
Catalog No.08T504A '08.9 ROHM ©
Appendix
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 re-
sponsibility 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 re-
sponsibility 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, elec-
tronic appliances and amusement devices).
The Products 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 failure of any Product, such as
derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your
use of any Product outside of the prescribed scope or not in accordance with the instruction manual.
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 any of the Products for the above special purposes. If a Product is intend-
ed to be used for any such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may be controlled under
the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact your nearest sales office.
THE AMERICAS / EUROPE / ASIA / JAPAN
ROHM Customer Support System
Contact us : webmaster@ rohm.co.jp
www.rohm.com
TEL : +81-75-311-2121
FAX : +81-75-315-0172
Copyright © 2009 ROHM CO.,LTD.
21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan
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