ROHM BR34L02FV-W

BR34L02FV-W
Memory ICs
256×8 bit Electrically Erasable PROM
(based on Serial Presence Detect)
BR34L02FV-W
The BR34L02FV-W is a 2k bit EEPROM memory with write-protect function having independent rewrite inhibit area,
developed for a DIMM that uses synchronous DRAM memory, and a RIMM that uses RAMBUS DRAM memory. This is
a memory IC that reads ID in order for the Plug & Play feature to operate.
∗ I C BUS is a registered trademark of Philips.
2
z Applications
General purpose
z Features
1) 256k registers × 8 bits serial architecture
2) Single power supply (1.8V to 5.5V)
3) Two wire serial interface
4) Page Write Function (16byte)
5) Write Protect Mode
Write protect 1 (Onetime Rom)
: 00h to 7Fh
Write protect 2 (Hardwire WP PIN)
: 00h to FFh
6) Low Power consumption
Write (5V)
: 1.2mA (Typ.)
Read (5V)
: 0.2mA (Typ.)
Standby (5V)
: 0.1µA (Typ.)
7) DATA security
Write protect feature (WP pin)
Inhibit to WRITE at low VCC
8) Small package - - - - - - SSOP-B8 pin
9) High reliability fine pattern CMOS technology
10) Endurance : 1,000,000 erase/write cycles
11) Data retention : 40years
12) Filtered inputs in SCL•SDA for noise suppression
13) Initial data FFh in all address
zAbsolute maximum ratings (Ta=25°C)
Parameter
Supply voltage
Power dissipation
Symbol
Limits
VCC
−0.3 to +6.5
Unit
V
∗1
mW
Pd
300(SSOP-B8)
Storage temperature
Tstg
−65 to +125
°C
Operating temperature
Topr
−40 to +85
°C
−
−0.3 to VCC+0.3
V
Terminal voltage
∗1 Reduced by 3.0mW for each increase in Ta of 1°C over 25°C.
Rev.A
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BR34L02FV-W
Memory ICs
zRecommended operating conditions (Ta=25°C)
Symbol
Limits
Unit
Supply voltage
Parameter
VCC
1.8 to 5.5
V
Input voltage
VIN
0 to VCC
V
zDC operating characteristics (Unless otherwise specified Ta= −40 to 85°C, VCC=1.8 to 5.5V)
Symbol
Min.
Typ.
Max.
Unit
"HIGH" input volatge 1
Parameter
VIH1
0.7VCC
−
−
V
"LOW" input volatge 1
VIL1
−
−
0.3VCC
V
2.5V≤VCC≤5.5V
"HIGH" input volatge 2
VIH2
0.8VCC
−
−
V
1.8V≤VCC<2.5V
"LOW" input volatge 2
VIL2
−
−
0.2VCC
V
1.8V≤VCC<2.5V
"LOW" output volatge 1
VOL1
−
−
0.4
V
IOL=3.0mA, 2.5V≤VCC≤5.5V, (SDA)
"LOW" output volatge 2
VOL2
−
−
0.2
V
IOL=0.7mA, 1.8V≤VCC<2.5V, (SDA)
Input leakage current 1
ILI 1
−1
−
+1
µA
VIN=0V to VCC
Input leakage current 2
ILI 2
−1
−
+15
µA
VIN=0V to VCC (WP)
Output leakage current
ILO
−1
−
+1
µA
VOUT=0V to VCC
ICC1
−
−
2.0
mA
VCC=5.5V, fSCL=400kHz, tWR=5ms,
Byte Write, Page Write, Write Protect
ICC2
−
−
0.5
mA
VCC=5.5V, fSCL=400kHz
Random Read, Current Read,
Sequential Read
ISB
−
−
2.0
µA
VCC=5.5V, SDA•SCL=VCC,
A0, A1, A2=GND, WP=GND
Operating current
Standby current
Conditions
2.5V≤VCC≤5.5V
∗This product is not designed for protection against radioactive rays.
zDimension
3.0±0.2
5
1
4
1.15±0.1
0.1
6.4±0.3
4.4±0.2
0.3Min.
8
(0.52)
0.15±0.1
0.1
0.22±0.1
0.65
Fig.1 PHYSICAL DIMENSION SSOP-B8 (Units : mm)
Rev.A
2/24
BR34L02FV-W
Memory ICs
zBlock diagram
1
A0
2kbit EEPROM array
2
A2
3
VCC
7
WP
6
SCL
5
SDA
8bit
8bit
A1
8
Address
decoder
Data
register
Slave word
address register
8bit
START
STOP
Control logic
ACK
GND
4
Vcc level detect
High voltage generator
Fig.2 BLOCK DIAGRAM
zPin configuration
VCC
WP
SCL
SDA
8
7
6
5
BR34L02FV-W
1
2
3
4
A0
A1
A2
GND
Fig.3 PIN LAYOUT
zPin descriptions
Pin name
I/O
VCC
−
Power supply
GND
−
Ground (0V)
A0, A1, A2
IN
Slave address set
SCL
IN
Serial clock input
SDA
IN / OUT
WP
IN
Function
Slave and word address,
serial data input, serial data output
∗1
Write protect input
∗2
∗1 An open drain output requires a pull-up resistor.
∗2 WP Pin has a Pull-Down resistor. Please be left unconnected or connect to GND
when WP feature is not in use.
Rev.A
3/24
BR34L02FV-W
Memory ICs
zTest circuit
VCC
VCC
IOL
SDA
GND
V
VOL
OUTPUT="L"
Fig.4 "L" OUTPUT VOLTAGE TEST CIRCUIT
VCC
ILI
ILO
VCC
A0, A1, A2
SDA, SCI, WP
A
GND
VOUT=0 to VCC
VIN=0 to VCC
Fig.5 INPUT/OUTPUT CURRENT TEST CIRCUIT
VCC
A
400kHz Clock
SCL
WRITE/READ INPUT
VCC
SDA
ICC
VCC
WP
A0, A1, A2
GND
Fig.6 POWER CONSUMPTION TEST CIRCUIT
VCC
A
VCC
SCL
ISB
VCC
SDA
A0, A1, A2
WP
GND
Fig.7 STANDBY CURRENT VOLTAGE TEST CIRCUIT
Rev.A
4/24
BR34L02FV-W
Memory ICs
zAC operating characteristics (Unless otherwise specified Ta= −40 to 85°C, VCC=1.8 to 5.5V)
Parameter
Symbol
Fast-mode
2.5V ≤ Vcc ≤ 5.5V
Min.
Typ.
Max.
Standard-mode
1.8V ≤ Vcc ≤ 5.5V
Unit
Min.
Typ.
Max.
Clock frequency
fSCL
−
−
400
−
−
100
kHz
Data clock "HIGH" period
tHIGH
0.6
−
−
4.0
−
−
µs
tLOW
1.2
−
−
4.7
−
−
µs
tR
−
−
0.3
−
−
1.0
µs
Data clock "LOW" period
SDA and SCL rise time
∗1
SDA and SCL fall time
∗1
tF
−
−
0.3
−
−
0.3
µs
tHD:STA
0.6
−
−
4.0
−
−
µs
Start condition setup time
tSU:STA
0.6
−
−
4.7
−
−
µs
Input data hold time
tHD:DAT
0
−
−
0
−
−
ns
Input data setup time
tSU:DAT
50
−
−
50
−
−
ns
tPD
0.1
−
0.9
0.2
−
3.5
µs
Start condition hold time
Output data delay time
tDH
0.1
−
−
0.2
−
−
µs
tSU:STO
0.6
−
−
4.7
−
−
µs
Bus free time
tBUF
1.2
−
−
4.7
−
−
µs
Write cycle time
tWR
−
−
5
−
−
5
ms
tl
−
−
0.1
−
−
0.1
µs
Output data hold time
Stop condition setup time
Noise spike width (SDA and SCL)
WP hold time
tHD:WP
0
−
−
0
−
−
ns
WP setup time
tSU:WP
0.1
−
−
0.1
−
−
µs
WP high period
tHIGH:WP
1.0
−
−
1.0
−
−
µs
∗1 Not 100% tested.
Rev.A
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BR34L02FV-W
Memory ICs
zSynchronous data timing
tR
tF
tHIGH
SCL
tHD : STA
tSU : DAT
tLOW
tHD : DAT
SDA
(IN)
tBUF
tPD
tDH
SDA
(OUT)
SCL
tSU : STA
tHD : STA
tSU : STO
SDA
START BIT
STOP BIT
Fig.8 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.
zWrite cycle timing
SCL
SDA
D0
ACK
tWR
WRITE DATA (n)
STOP CONDITION
START CONDITION
Fig.9 WRITE CYCLE TIMING
Rev.A
6/24
BR34L02FV-W
Memory ICs
zWP timing
SCL
DATA (1)
SDA
D1
DATA (n)
D0
ACK
ACK
tWR
STOP BIT
WP
tSU : WP
tHD : WP
Fig.10(a) WP TIMING OF THE WRITE OPERATION
SCL
DATA (1)
SDA
D1
DATA (n)
D0
ACK
ACK
tHIGH : WP
WP
Fig.10(b) WP TIMING OF THE WRITE CANCEL OPERATION
• For the WRITE operation, WP must be “LOW” during the period of time from the rising edge of the clock which takes in
D0 of first byte until the end of tWR. (See Fig.10(a) )
During this period, WRITE operation is canceled by setting WP “HIGH”. (See Fig.10(b))
• In the case of setting WP “HIGH” during tWR, WRITE operation is stopped in the middle and the data of accessing
address is not guaranteed. Please write correct data again in the case.
Rev.A
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BR34L02FV-W
Memory ICs
zDevice operation
1) Start condition (Recognition of 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.8 SYNCHRONOUS DATA TIMING)
2) 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.8 SYNCHRONOUS DATA TIMING)
3) Notice about write command
• In the case that stop condition is not executed in WRITE mode, transferred data will not be written in a memory.
4) Device addressing
• Following a START condition, the master output the device address to be accessed.
The most significant four bits of the slave address are the “device type identifier”.
For the device this is fixed as “1010”.
(In access to WP resister, this code use “0110”.)
• The next three bit (device address) address a particular to the bus.
The device address is defined by the start of A0, A1 and A2 input pins. This IC works only when the device address
inputted from SDA pin correspond to the state of A0, A1 and A2 input pins. Using this address scheme, up to eight
device may be connected, to the bus. The last bit of the stream (R/W - - - READ/WRITE) determines the operation
to the performed.
R/W=0
WRITE (including word address input of Random Read)
R/W=1
READ
Device Type
Device Address
1010
A2
A1
A0
R/W
Access to Memory
0110
A2
A1
A0
R/W
Access to Write Protect Resister
5) Write protect command
• Write Protect Command is to cancel any write command, which access to the address 00 to 7Fh.
Write Protect Resister can be written for once. (Onetime Rom)
Once this command is executed, the data is protected forever.
6) Write protect pin (WP)
• When WP pin set to VCC (H level), write protect is set for 256words (all address).
When WP pin set to GND (L level), it is enable to write 256words (all address).
If permanent protection is done by Write Protect command, lower half area (00 to 7Fh address) is inhibited writing
regardless of WP pin state.
WP pin has a Pull-Down resister. Please be left unconnected or connect to GND when WP feature is not in use.
Rev.A
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BR34L02FV-W
Memory ICs
7) Acknowledge
• Acknowledge is a software convention used to indicate successful data transfers.
The Transmitter device will release the bus after transmitting eight bits.
(When inputting the slave address in the write or read operation, transmitter is µ-COM. When outputting the data in
the read operation, it is this device.)
• During the ninth clock cycle, the receiver will pull the SDA line LOW to acknowledge that the eight bits of data has
been received.
(When inputting the slave address in the write or read operation, receiver is this device. When outputting the data in
the read operation, it is µ-COM.)
• The device will respond with an Acknowledge after recognition of a START condition and its slave address (8bit).
• In the WRITE mode, the device will respond with an Acknowledge, after the receipt of each subsequent 8-bit word
(word address and write data).
• In the READ mode, the device will transmit eight bit 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 the standby mode.
(See Fig.11 ACKNOWLEDGE RESPONSE FROM RECEIVER)
START CONDITION
(START BIT)
SCL
(From µ−COM)
1
8
9
SDA
(µ−COM
OUTPUT DATA)
SDA
(IC OUTPUT DATA)
Acknowledge Signal
(ACK Signal)
Fig.11 ACKNOWLEDGE RESPONSE FROM RECEIVER
Rev.A
9/24
BR34L02FV-W
Memory ICs
zByte write
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
DATA
WA
0
R A
/ C
W K
S
T
O
P
D7
D0
A
C
K
A
C
K
WP
Fig.12 BYTE WRITE CYCLE TIMING
• By using 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.
zPage write
S
T
A
R
T
SDA
LINE
SLAVE
ADDRESS
W
R
I
T
E
WORD
ADDRESS (n)
WA
7
1 0 1 0 A2 A1 A0
R A
/ C
WK
DATA (n)
WA
0
D7
S
T
O
P
DATA (n+15)
D0
A
C
K
D0
A
C
K
A
C
K
WP
Fig.13 PAGE WRITE CYCLE TIMING
• This device is capable of sixteen byte Page Write operation.
• When two or more byte data are inputted, the four low order address bits are internally incremented by one after the
receipt of each word. The four higher order bits of the address (WA7 to WA4) remain constant.
• If the master transmits more than sixteen words, prior to generating the STOP condition, the address counter will “roll
over”, and the previous transmitted data will be overwritten.
Rev.A
10/24
BR34L02FV-W
Memory ICs
zCurrent read
S
T
A
R
T
SDA
LINE
SLAVE
ADDRESS
1
0
1
R
E
A
D
S
T
O
P
DATA
0 A2 A1 A0
D7
D0
R A
/ C
W K
A
C
K
Fig.14 CURRENT READ CYCLE TIMING
• In case that the previous operation is Random or Current Read (which includes Sequential Read respectively), 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 the last command is Byte or Page Write, the internal address counter stays at the last address (n).
Thus Current Read outputs the data of the word address (n).
• If an Acknowledge is detected, and no STOP condition is generated by the master (µ-COM), the device will continue to
transmit the 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 the standby mode.
NOTE) If an Acknowledge is detected with “Low” level, not “High” level, command will become Sequential Read. So the
device transmits the next data, Read is not terminated. In the case of terminating Read, input Acknowledge with
“High” always, then input stop condition.
zRandom read
S
T
A
R
T
SDA
LINE
SLAVE
ADDRESS
W
R
I
T
E
WORD
ADDRESS(n)
WA
7
1 0 1 0 A2A1A0
R A
/ C
W K
S
T
A
R
T
WA
0
SLAVE
ADDRESS
R
E
A
D
1 0 1 0 A2A1A0
A
C
K
S
T
O
P
DATA(n)
D7
R A
/ C
W K
D0
A
C
K
Fig.15 RANDOM READ CYCLE TIMING
• Random Read operation allows the master to access any memory location indicated word address.
• If an Acknowledge is detected, and no STOP condition is generated by the master (µ-COM), the device will continue to
transmit the 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 the standby mode.
NOTE) If an Acknowledge is detected with “Low” level, not “High” level, command will become Sequential Read. So the
device transmits the next data, Read is not terminated. In the case of terminating Read, input Acknowledge with
“High” always, then input stop condition.
Rev.A
11/24
BR34L02FV-W
Memory ICs
zSequential read
S
T
A
R
T
SDA
LINE
R
E
A
D
SLAVE
ADDRESS
1 0 1 0 A2 A1 A0
DATA(n)
D7
DATA(n+x)
D0
R A
/ C
W K
S
T
O
P
D7
A
C
K
D0
A
C
K
A
C
K
Fig.16 SEQUENTIAL READ CYCLE TIMING
(Current Read)
• If an Acknowledge is detected, and no STOP condition is generated by the master (µ-COM), the device will continue to
transmit the 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 the standby mode.
• The Sequential Read operation can be performed with both Current Read and Random Read.
NOTE) If an Acknowledge is detected with “Low” level, not “High” level, command will become Sequential Read. So the
device transmits the next data, Read is not terminated. In the case of terminating Read, input Acknowledge with
“High” always, then input stop condition.
zWrite protect
S
T
A
R
T
SDA
LINE
W
R
I
T
E
SLAVE
ADDRESS
WORD
ADDRESS
∗
0 1 1 0 A2 A1 A0
R A
/ C
W K
S
T
O
P
DATA
∗
∗
A
C
K
∗
A
C
K
WP
Fig.17 WRITE PROTECT CYCLE TIMING
• Using this command, writing is inhibited in lower half area. (00h to 7Fh address) If Write Protect Command is executed,
cannot cancel the protection permanently. (Onetime Rom)
• This Command is cancelled, if Write Protect Command is already executed.
• During this command, please be left WP unconnected or connect WP to GND.
• This command need the period of tWR after stop condition just like Byte or Page Write command. During the tWR, next
command is ignored.
Rev.A
12/24
BR34L02FV-W
Memory ICs
zApplication
1) WP effective timing
WP is fixed to “H” or “L” usually. But in case of controlling WP to cancel the write command, please pay attention to
⎡WP effective timing⎦ as follows.
During write command input, write command is canceled by controlling WP “H” within the WP cancellation effective
period.
The period from the start condition to the rising edge of the clock which take in D0 of the data (the first byte of the data
for Page Write) is the cancellation invalid period. WP input is don’t care during the period. Setup time for rising edge of
the SCL which takes in D0 must be more than 100ns.
The period from the rising edge of SCL which takes in D0 to the end of internal write cycle (tWR) is the cancellation
effective period. In case of setting WP to “H” during tWR, WRITE operation is stopped in the middle and the data of
accessing address is not guaranteed, so that write correct data again please.
It is not necessary waiting tWR (5msmax.) after stopping command by WP, because the device is stand by state.
· The rising edge of the clock
which take in D0
SCL
SDA
SCL
D1
D0
ACK
SDA
AN ENLARGEMENT
SDA
S
T
A
R
T
SLAVE
ADDRESS
A
C
K
L
WORD
ADDRESS
A
C
K
L
D7
D6
· The rising edge
of SDA
D0
ACK
AN ENLARGEMENT
D5
D4
WP cancellation invalid period
D3
D2
D1
D0
A
C
K
L
DATA
A
C
K
L
A
C
K
L
S
T
O
P
tWR
WP cancellation effective period
Stop of the write
operation
No data will be written
Data is not
guaranteed
WP
Fig.18 WP EFFECTIVE TIMING
Rev.A
13/24
BR34L02FV-W
Memory ICs
2) Software reset
Please execute software reset in care that the device is an unexpected state after power up and/or the command
input need to be reset.
There are some kinds of software reset. Here we show three types of example as follows.
During dummy clock, please release SDA bus (tied to VCC by pull up resistor).
During that time, the device may pull the SDA line LOW for acknowledge or outputting or read data.
If the master controls the SDA line HIGH, it will conflict with the device output LOW then it makes a current overload. It
may cause instantaneous power down and may damage the device.
DUMMY CLOCK × 14
SCL
1
2
13
START × 2
14
COMMAND
COMMAND
SDA
Fig.19-(a) DUMMY CLOCK × 14 + START + START
DUMMY CLOCK × 9
START
SCL
1
2
8
START
9
COMMAND
COMMAND
SDA
Fig.19-(b) START+ DUMMY CLOCK × 9 + START
START × 9
SCL
1
2
3
7
8
9
COMMAND
COMMAND
SDA
Fig.19-(c) START × 9
∗ COMMAND starts with start condition.
Rev.A
14/24
BR34L02FV-W
Memory ICs
3) Acknowledge polling
Since the device ignore all input commands during the internal write cycle, no ACK will be returned.
When the master send the next command after the write command, if the device returns the ACK, it means that the
program is completed. If no ACK is returned, it means that the device is still busy.
By using Acknowledge polling, the waiting time is minimized less than tWR=5ms.
In case of operating Write or Current Read right after Write, first, send the slave address (R/W is “HIGH” or “LOW”
respectively). After the device returns the ACK, continue word address input or data output respectively.
During the internal write cycle,
no ACK will be returned.
(ACK=HIGH)
THE FIRST WRITE COMMAND
S
T
A
R
T
WRITE COMMAND
S
T
A
R
T
S
T
O
P
S
T
A
R
T
A
C
K
H
SLAVE
ADDRESS
SLAVE
ADDRESS
A
C
K
H
•••
tWR
THE SECOND WRITE COMMAND
•••
S
T
A
R
T
SLAVE
ADDRESS
S
T
A
R
T
A
C
K
H
A
C
K
L
SLAVE
ADDRESS
WORD
ADDRESS
A
C
K
L
DATA
A
C
K
L
S
T
O
P
tWR
After the internal write cycle
is completed ACK will be returned
(ACK=LOW). Then input next
Word Address and data.
Fig.20 SUCCESSIVE WRITE OPERATION BY ACKNOWLEDGE POLLING
4) Command cancellation by start and stop condition
During a command input, it is canceled by the successive inputs of start condition and stop condition. (Fig.21)
But during ACK or data output, the device may output the SDA line LOW. In such cases, operation of start and stop
condition is impossible, so that the reset can’t work. Execute the software reset in the cases. (See Page14)
Operating the command cancel by start and stop condition during the command of Random Read or Sequential
Read or Current Read, internal address counter is not confirmed.
Therefore operation of Current Read after this is not valid. Operate a Random Read in this case.
SCL
SDA
1
0
1
0
START
CONDITION
STOP
CONDITION
Fig.21 COMMAND CANCELLATION BY START AND STOP CONDITION
DURING THE INPUT OF SLAVE ADDRESS
Rev.A
15/24
BR34L02FV-W
Memory ICs
5) Notes for power supply
VCC rises through the low voltage region in which internal circuit of IC and the controller are unstable, so that device
may not work properly due to an incomplete reset of internal circuit.
To prevent this, the device has the feature of P.O.R. and LVCC.
In the case of power up, keep the following conditions to ensure functions of P.O.R. and LVCC.
(1) It is necessary to be “SDA=’H’” and “SCL=’L’ or ‘H’”
(2) Follow the recommended conditions of tR, tOFF, Vbot for the function of P.O.R. during power up.
tR
VCC
Recommended conditions of tR, tOFF, Vbot
tOFF
Vbot
tR
tOFF
Vbot
Below 10ms
Above 10ms
Below 0.3V
Below 100ms
Above 10ms
Below 0.2V
0
VCC rising wave from
(3) Prevent SDA and SCL from being “Hi-Z”.
In case that condition 1. and/or 2. cannot be met, take following actions.
A) Unable to keep condition 1.(SDA is “LOW” during power up.)
→ Control SDA, SCL to be “HIGH” as figure below.
VCC
tLOW
SCL
SDA
After VCC becomes stable
After VCC becomes stable
tDH
tSU:DAT
a) SCL="H" and SDA="L"
tSU:DAT
b) SCL="L" and SDA="L"
B) Unable to keep condition 2.
→ After power becomes stable, execute software reset. (See Page14)
C) Unable to keep both conditions 1 and 2.
→ Follow the instruction A first, then the instruction B.
• LVCC circuit
LVCC circuit inhibit write operation at low voltage, and prevent an inadvertent write.
Below the LVCC voltage (Typ.=1.2V), write operation is inhibited.
Rev.A
16/24
BR34L02FV-W
Memory ICs
6) I/O circuit
• Pull up resister of SDA pin
The pull up resister is needed because SDA is NMOS open drain. Decide the value of this resister (RPU) properly,
by considering VIL, IL characteristics of a controller which control the device and VOH, IOL characteristics of the
device. If large RPU is chosen, clock frequency need to be slow.
In case of small RPU, the operating current increases.
• Maximum of RPU
Maximum of RPU is determined by following factor.
c SDA rise time determined by RPU and the capacitance of bus line (CBUS) must be less than TR.
And the other timing must keep the conditions of AC spec.
d When SDA bus is HIGH, the voltage A of SDA bus determined by a total input leak (IL) of the all devices
connected to the bus and RPU must be enough higher than input HIGH level of a controller and the device,
including noise margin 0.2VCC.
VCC − ILRPU − 0.2VCC ≥ VIH
MICRO
COMPUTER
RPU ≤
BR24LXX
0.8VCC − VIH
IL
RPU
IL
Examples : When VCC=3V IL=10µA VIH=0.7VCC
A
SDA PIN
IL
THE CAPACITANCE OF
BUS LINE (CBUS)
According to 2
RPU ≤
0.8×3−0.7×3
10×10−6
≤ 300 [kΩ]
Rev.A
17/24
BR34L02FV-W
Memory ICs
• The minimum value RPU
The minimum value of RPU is determined by following factors.
c Meet the condition that VOLMAX=0.4V, IOLMAX=3mA when the device output low on SDA line.
VCC − VOL
≤ IOL
RPU
RPU ≥
VCC − VOL
IOL
d VOLMAX (=0.4V) must be lower than the input LOW level of the controller and the EEPROM including
recommended noise margin (0.1VCC).
VOLMAX ≤ VIL − 0.1VCC
Examples : VCC=3V, VOL=0.4V, IOL=3mA, the VIL of the controller and the EEPROM is VIL=0.3VCC
According to 1
RPU ≥
3−0.4
3×10−3
≥ 867 [Ω]
and
VOL =0.4[V]
VIL =0.3×3
=0.9[V]
so that condition 2 is met
• Pull up resister of SCL pin
In the case that SCL is controlled by CMOS output, the pull up resister of SCL is not needed.
But in the case that there is a timing at which SCL is Hi-Z, connect SCL to VCC with pull up resister.
Several ∼ several dozen kΩ is recommended as a pull up resister, which is considered with the driving ability of the
output port of the controller.
7) Connections of A0, A1, A2, WP pin
• Connections of device address pin (A0, A1, A2)
The state of device address PIN are compared with the device address send by the master, then one of the devices
which are connected to the identical bus is selected. Pull up or down these pins, or connect them to VCC or GND.
• Connections of WP pin
The WP input allows or inhibits write operations. When WP is HIGH, only READ is available and WRITE to any
address is inhibited. Both Read and Write are available when WP is LOW.
In the case that the device is used as a ROM, it is recommended that WP is pulled up or connected to VCC.
In the case that both READ and WRITE are operated, WP pin must be pulled down or connected to GND,
controlled, or be left unconnected. (WP has a pull down resister. So it is allowed to be left unconnect)
Rev.A
18/24
BR34L02FV-W
Memory ICs
8) Notes for noise on VCC
• About bypass capacitor
Noise and surges on power line may cause the abnormal function. It is recommended that the bypass capacitors
(0.1µF) are attached on the VCC and GND line beside the device.
The attachment of bypass capacitors on the board near by connector is also recommended.
IC
capacitor 0.01 to 0.1µF
PRINT BASE
GND
VCC
capacitor 10 to 100µF
9) The notice about the connection of controller
• About RS
The open drain interface is recommended for SDA port in I2C BUS. But, in the case that Tri-state CMOS interface is
applied to SDA, insert a series resister RS between SDA pin of the device and a pull up resister RPU.
It limits the current from PMOS of controller to NMOS of EEPROM.
RS also protects SDA pin from surges. Therefore, RS is able to be used though SDA port is open drain.
RPU
RS
CONTROLLER
SDA PIN
EEPROM
ACK
SCL
SDA
"H" OUTPUT OF
CONTROLLER
"L" OUTPUT OF
EEPROM
The "H" output of controller
and the "L" output of EEPROM may cause
current overload to SDA line.
Rev.A
19/24
BR34L02FV-W
Memory ICs
• The maximum value of RS
The maximum value of RS is determined by following factors.
c SDA rise time determined by RPU and the capacitance of bus line (CBUS) of SDA must be less than tR. And the
other timing must also keep the conditions of the AC timing.
d When the device outputs LOW on SDA line, the voltage of the bus A determined by RPU and RS must be
lower than the inputs LOW level of the controller, including recommended noise margin (0.1VCC).
(VCC−VOL) × RS
+ VOL+0.1VCC ≤ IOL
RPU+RS
RS ≤
VIL−VOL−0.1VCC
× RPU
1.1VCC−IIL
Examples : When VCC=3V, VIL=0.3VCC, VOL=0.4V, RPU=20kΩ
According to 2
RS ≤
0.3×3−0.4−0.1×3
× 20×103
1.1×3−0.3×3
≤ 1.67 [kΩ]
VCC
RPU
A
RS
VOL
CAPACITANCE OF
BUS LINE (CBUS)
VIL
CONTROLLER
EEPROM
• The minimum value of Rs
The minimum value of RS is determined by the current overload due to the conflict on the bus.
The current overload may cause noises on the power line and instantaneous power down.
The following conditions must be met, where Ι is the maximum permissible current.
The maximum permissible current depends on VCC line impedance and so on. It need to be less than 10mA for
EEPROM.
VCC
≤Ι
RS
RS ≥
VCC
Ι
Examples : When VCC=3V, Ι=10mA
RPU
RS
"L" OUTPUT
RS ≥
3
10×10−3
≥ 300 [Ω]
MAXIMUM
CURRENT Ι
"H" OUTPUT
CONTROLLER
EEPROM
Rev.A
20/24
BR34L02FV-W
Memory ICs
6
5
5
4
SPEC
3
2
Ta=85°C
Ta=−40°C
Ta=25°C
1
1
L OUTPUT VOLTAGE : VOL (V)
6
L INPUT VOLTAGE : VIL (V)
H INPUT VOLTAGE : VIH (V)
10) The special character data
The following characteristic data are typ value.
4
Ta=85°C
Ta=−40°C
Ta=25°C
3
2
1
0.8
0.6
Ta=25°C
0.4
Ta=85°C
SPEC
0.2
SPEC
1
2
3
4
5
0
0
6
2
3
4
5
6
1
3
2
4
SUPPLY VOLTAGE : VCC (V)
L OUTPUT CURRENT : IOL (mA)
Fig.22 High input voltage VIH
(A0,A1,A2,SCL,SDA,WP)
Fig.23 Low input voltage VIL
(A0,A1,A2,SCL,SDA,WP)
Fig.24 Low output voltage VOL−IOL
(VCC=1.8V)
INPUT LEAK CURRENT : ILI (µA)
0.6
SPEC
0.4
Ta=25°C
Ta=85°C
0.2
SPEC
1
0.8
0.6
0.4
Ta=85°C
Ta=25°C
Ta=−40°C
0.2
SPEC
12
8
Ta=85°C
4
Ta=25°C
Ta=−40°C
1
2
3
4
5
Ta=−40°C
0
0
6
L OUTPUT CURRENT : IOL (mA)
2
3
5
0
0
6
0.6
0.4
Ta=85°C
Ta=25°C
Ta=−40°C
1
2
3
4
5
6
fSCL=400kHz
DATA=AAh
1.5
1
Ta=25°C
Ta=85°C
Ta=−40°C
0.5
0
0
3
4
5
6
0.6
CURRENT CONSUMPTION
AT READING : ICC2 (mA)
CURRENT CONSUMPTION
AT WRITING : ICC1 (mA)
0.8
2
2
Fig.27 Input leakage current ILI (WP)
SPEC
1
1
SUPPLY VOLTAGE : VCC (V)
2.5
SPEC
0
0
4
Fig.26 Input leakage current ILI
(A0,A1,A2,SCL,WP)
1.2
OUTPUT LEAK CURRENT : ILO (µA)
1
SUPPLY VOLTAGE : VCC (V)
Fig.25 Low output voltage VOL−IOL
(VCC=2.5V)
0.2
6
16
1.2
0.8
0
0
5
SUPPLY VOLTAGE : VCC (V)
1
L OUTPUT VOLTAGE : VOL (V)
1
Ta=−40°C
0
0
INPUT LEAK CURRENT : ILI (µA)
0
0
1
2
3
4
5
6
SPEC
0.5
0.4
fSCL=400kHz
DATA=AAh
0.3
Ta=25°C
Ta=85°C
0.2
0.1
0
0
Ta=−40°C
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.28 Output leakage current
ILO(SDA)
Fig.29 Write operating current ICC1
(fSCL=400kHz)
Fig.30 Read operating current ICC2
(fSCL=400kHz)
Rev.A
21/24
BR34L02FV-W
Memory ICs
SPEC
2
fSCL=100kHz
DATA=AAh
1.5
1
Ta=25°C
Ta=85°C
Ta=−40°C
0.5
0
0
1
3
2
4
5
2.5
SPEC
0.5
fSCL=100kHz
DATA=AAh
0.4
0.3
Ta=25°C
Ta=85°C
0.2
0.1
1.5
1
0.5
Ta=−40°C
0
0
6
SPEC
2
1
3
2
4
Ta=25°C
Ta=−40°C
Ta=85°C
5
0
0
6
1
3
2
4
5
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.31 Write operating current ICC1
(fSCL=100kHz)
Fig.32 Read operating current ICC2
(fSCL=100kHz)
Fig.33 Standby current ISB
10000
5
1000
SPEC1
100
SPEC2
10
SPEC2
SPEC2
4
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
3
2
1
6
5
DATA CLK L TIME : tLOW (µs)
Ta=85°C
Ta=25°C
Ta=−40°C
DATA CLK H TIME : tHIGH (µs)
SCL FREQUENCY : fSCL (kHz)
0.6
STANDBY CURRENT : ISB (µA)
CURRENT CONSUMPTION
AT READING : ICC2 (mA)
CURRENT CONSUMPTION
AT WRITING : ICC1 (mA)
2.5
Ta=−40°C
Ta=25°C
Ta=85°C
SPEC1
4
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
3
2
SPEC1
1
Ta=85°C
Ta=25°C
Ta=−40°C
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
1
2
3
4
5
0
0
6
SUPPLY VOLTAGE : VCC (V)
5
SPEC2
4
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
3
2
1
0
0
Ta=−40°C
Ta=25°C
Ta=85°C
1
SPEC1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
Fig.37 Start condition hold time tHD:STA
START CONDITION SET UP TIME : tSU:STA (µs)
START CONDITION HOLD TIME : tHD:STA (µs)
Fig.34 Clock frequency fSCL
1
2
3
4
5
0
0
6
4
5
Fig.36 Data clock "L" period tLOW
6
50
SPEC2
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
3
2
SPEC1
0
0
3
Fig.35 Data clock "H" period tHIGH
5
1
2
SUPPLY VOLTAGE : VCC (V)
6
4
1
SUPPLY VOLTAGE : VCC (V)
INPUT DATA HOLD TIME : tHD:DAT (ns)
1
0
Ta=−40°C
Ta=25°C
Ta=85°C
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
Fig.38 Start condition setup time tSU:STA
SPEC1,2
0
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
−50
−100
Ta=85°C
Ta=25°C
Ta=−40°C
−150
−200
0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
Fig.39 Input data hold time
tHD:DAT(HIGH)
Rev.A
22/24
BR34L02FV-W
Memory ICs
SPEC1,2
0
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
−50
Ta=85°C
−100
−150
Ta=25°C
−200
0
1
Ta=−40°C
2
3
4
5
6
300
SPEC2
200
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
SPEC1
100
0
Ta=85°C
Ta=25°C
Ta=−40°C
−100
−200
0
1
SUPPLY VOLTAGE : VCC (V)
3
4
5
6
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
2
SPEC1
SPEC2
0
0
SPEC1
1
2
3
4
5
SPEC1
100
Ta=85°C
0
Ta=25°C
−100
−200
0
1
2
3
4
5
SPEC2
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
2
Ta=−40°C
Ta=25°C
Ta=85°C
SPEC1
1
SPEC2
SPEC1
1
2
3
4
5
SPEC2
3
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
2
Ta=85°C
Ta=25°C
Ta=−40°C
SPEC2
SPEC1
0
0
6
SPEC1
1
1
2
3
4
5
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.43 Output data delay time tPD0
Fig.44 Output data delay time tPD1
Fig.45 Output data hold time tDH0
3
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
2
Ta=−40°C
Ta=25°C
Ta=85°C
SPEC1
1
SPEC2
0
0
SPEC1
1
2
3
4
5
SUPPLY VOLTAGE : VCC (V)
Fig.46 Output data hold time tDH1
6
SPEC2
4
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
3
2
1
0
0
6
5
5
BUS OPEN TIME
BEFORE TRANSMISSION : tBUF (µs)
SPEC2
STOP CONDITION SET UP TIME : tSU:STO (µs)
SUPPLY VOLTAGE : VCC (V)
4
6
4
3
0
0
6
Ta=−40°C
Fig.42 Input data setup time
tSU:DAT(LOW)
OUTPUT DATA HOLD TIME : tDH (µs)
OUTPUT DATA DELAY TIME : tPD (µs)
SPEC2
3
1
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
SUPPLY VOLTAGE : VCC (V)
4
Ta=85°C
Ta=25°C
Ta=−40°C
SPEC2
200
Fig.41 Input data setup time
tSU:DAT(HIGH)
4
OUTPUT DATA DELAY TIME : tPD (µs)
2
300
SUPPLY VOLTAGE : VCC (V)
Fig.40 Input data hold time
tHD:DAT(LOW)
OUTPUT DATA HOLD TIME : tDH (µs)
INPUT DATA SET UP TIME : tSU:DAT (ns)
INPUT DATA SET UP TIME : tSU:DAT (ns)
INPUT DATA HOLD TIME : tHD:DAT (ns)
50
Ta=85°C
Ta=25°C
Ta=−40°C
1
SPEC1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
Fig.47 Stop condition setup time tSU:STO
SPEC2
4
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
3
2
SPEC1
1
0
0
Ta=−40°C
Ta=25°C
Ta=85°C
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
Fig.48 BUS free time tBUF
Rev.A
23/24
BR34L02FV-W
Memory ICs
0.6
SPEC1,2
5
Ta=−40°C
4
Ta=25°C
3
Ta=85°C
2
1
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
0
0
1
3
2
4
0.5
Ta=−40°C
0.4
Ta=25°C
0.3
Ta=85°C
0.2
0.1
1
3
2
4
0.3
Ta=−40°C
0.2
Ta=25°C
Ta=85°C
0.1
SPEC1,2
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.49 Write cycle time tWR
Fig.50 Noise spike width tI (SCL H)
Fig.51 Noise spike width tI (SCL L)
0.6
0.5
0.4
Ta=−40°C
Ta=25°C
Ta=85°C
0.2
0.1
SPEC1,2
0
0
1
3
2
4
6
5
0.2
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
0.5
WP SET UP TIME : tSU:WP (µs)
NOISE REDUCTION
EFFECTIVE TIME : tI (SDA L) (µs)
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
0.3
0.4
0
0
6
5
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
0.5
SUPPLY VOLTAGE : VCC (V)
0.6
NOISE REDUCTION
EFFECTIVE TIME : tI (SDA H) (µs)
SPEC1,2
0
0
6
5
0.6
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
NOISE REDUCTION
EFFECTIVE TIME : tI (SCL L) (µs)
NOISE REDUCTION
EFFECTIVE TIME : tI (SCL H) (µs)
INTERNAL WRITE CYCLE TIME : tWR (ms)
6
0.4
Ta=−40°C
0.3
Ta=25°C
Ta=85°C
0.2
0.1
SPEC1,2
0
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
−0.2
Ta=85°C
−0.4
0
0
1
2
3
4
Ta=−40°C
Ta=25°C
SPEC1,2
5
6
−0.6
0
1
2
3
4
5
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.52 Noise spike width tI (SDA H)
Fig.53 Noise spike width tI (SDA L)
Fig.54 WP setup time tSU:WP
6
WP EFFECTIVE TIME : tHIGH:WP (µs)
1.2
1
SPEC1,2
0.8
SPEC1 : FAST-MODE
SPEC2 : STANDARD-MODE
0.6
0.4
Ta=−40°C
Ta=25°C
Ta=85°C
0.2
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
Fig.55 WP high period tHIGH:WP
Rev.A
24/24
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.1