Sanyo LE24CBK222 Triple port eeprom two wire serial interface (2k2k eeprom) Datasheet

Ordering number : EN*A1811A
CMOS IC
LE24CBK222
Triple port EEPROM
Two Wire Serial Interface
(2K+2K EEPROM)
Overview
The triple port EEPROM series consists of two independent banks, and each bank can be controlled separately using
dedicated control pins. The EEPROM also features a control port, which is a third pin separate from the pins used for the
banks, and by accessing the memory areas from this control port, the two-bank configuration (2K bits + 2K bits) can be
used as a pseudo-one-bank configuration (4K bits). Together with the 16-byte page write function, this enables a
reduction in the number of factory write processes.
Furthermore, the EEPROM has a configuration area which is separate from the 2K-bit + 2K-bit area, and by using the
settings stored in this configuration area, it is possible to change the slave address for each port and to set read/write
protection for each port.
This product incorporates SANYO's high performance CMOS EEPROM technology and realizes high-speed operation
and high-level reliability. The interface of this product is compatible with the I2C bus protocol, making it ideal as a
nonvolatile memory for small-scale parameter storage.
In addition, this product also supports DDC2TM, so it can also be used as an EDID data storage memory for display
equipment.
Functions
• Capacity
: Bank1:2K bits (256 × 8 bits) + Bank2:2K bits (256 × 8 bits)
+ configuration area: 128 bits (16 × 8 bits), 4224 bits in total
• Single supply voltage
: 2.5V to 5.5V
• Interface
: Two wire serial interface (I2C Bus*), VESA DDC2TM compliant** 3-port access
• Operating clock frequency : 400kHz (max)
• Low power consumption : Standby: 5μA (max)
: One-bank read: 0.5 mA (max.), Two-bank simultaneous read: 1.0 mA (max.)
* : I2C Bus is a trademark of Philips Corporation.
** : DDC and EDID are trademarks of Video Electronics Standard Association (VESA).
Continued on next page.
* This product is licensed from Silicon Storage Technology, Inc. (USA), and manufactured and sold by
SANYO Semiconductor Co., Ltd.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer' s products or
equipment.
10511 SY/92910 SY No.1811-1/20
LE24CBK222
Continued from preceding page.
• Automatic page write mode: 16 bytes
• Slave address setting
: Slave address can be set for each port.
• Protect function
: Read/write protection can be set for each port.
• Read mode
: Sequential read and random read
• Erase/Write cycles
: 106 cycles
• Data Retention
: 20 years
• High reliability
: Adopts SANYO’s proprietary symmetric memory array configuration (USP6947325)
Noise filters connected to SCL1, SDA1, SCL2, SDA2, SCLC and SDAC pins
Incorporates a feature to prohibit write operations under low voltage conditions.
• Package
: LE24CBK222M
MFP8 (225mil)
: LE24CBK222TT MSOP8 (150mil)
Package Dimensions
unit:mm (typ)
3032E
Package Dimensions
[LE24CBK222M]
unit:mm (typ)
3245B
[LE24CBK222TT]
3.0
5.0
8
3.0
2
1.27
1
0.15
(0.53)
1.7 MAX
0.35
2
0.65
0.125
0.08
0.1
(0.85)
(1.5)
0.25
1.1MAX
1
(0.6)
0.5
0.63
4.9
4.4
6.4
8
SANYO : MFP8(225mil)
SANYO : MSOP8(150mil)
Pin Assignment
Pin Descriptions
SCL1
1
8
VDD
SDA1
2
7
SCL2
SDA2
GND
3
4
6
5
SCLC
SDAC
PIN.1
SCL1
Clock input
PIN.2
SDA1
Data input/output
PIN.3
SDA2
Data input/output
PIN.4
GND
Ground
PIN.5
SDAC
Data input/output
PIN.6
SCLC
Clock input
PIN.7
SCL2
Clock input
PIN.8
VDD
Power supply
Port 1
Port 2
Control port
Port 2
No.1811-2/20
LE24CBK222
Block Diagram
Port 2
SDA2
SCL2
Port
Control
Port
Control
Bank1
(2k EEPROM)
Port
Control
IO Buffer
SCL1
State
Control
IO Buffer
Port 1
SDA1
Low VCC
Detect
IO Buffer
VDD
Control Port
SDAC
SCLC
Bank2
(2k EEPROM)
Configuration Area
Protect info.
Slave Address
Slave Enable
Description of Operation
Access to Bank1 is performed through port 1 (SCL1 / SDA1), and access to Bank2 through port 2 (SCL2 / SDA2).
When read operations are performed, Bank1 and Bank2 can be controlled independently of each other and both banks
can be accessed at the same time. When write operations are performed, it is not possible to access both banks while a
write operation is in progress in one of the banks (including the write wait time).
Both Bank1 and Bank2 can be accessed from the control port (SCLC, SDAC). The two-bank configuration (2K bits +
2K bits) can be used as a pseudo-one-bank configuration (4K bits). Data correlation is guaranteed between the mode in
which accesses are made from port1 or port 2 and the mode in which accesses are made from the control port, enabling
operations such as writing data from control port in a lump and reading data from port 1 or port 2.
Access to the configuration area where the slave addresses of the ports and protect information is stored is made from
the control port.
Specifications
Absolute Maximum Ratings
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
-0.5 to +6.5
V
DC input voltage
-0.5 to +5.5
V
Over-shoot voltage
Storage temperature
Below 20ns
Tstg
-1.0 to +6.5
V
-65 to +150
°C
Note: If an electrical stress exceeding the maximum rating is applied, the device may be damaged.
Operating Conditions
Parameter
Operating supply voltage
Operating temperature
Symbol
Conditions
Ratings
Unit
2.5 to 5.5
V
-40 to +85
°C
No.1811-3/20
LE24CBK222
DC Electrical Characteristics
Parameter
Symbol
VDD=2.5V to 5.5V
Conditions
min
Supply current at reading
typ
Unit
max
ICC11
f=400kHz
0.5
mA
ICC12
f=400kHz
1.0
mA
Supply current at writing
ICC2
f=400kHz, tWC=5ms
5
mA
Standby current
ISB
VIN=VDD or GND
5
μA
Input leakage current
ILI
VIN=GND to VDD
-2.0
+2.0
μA
Output leakage current (SDA)
ILO
VOUT=GND to VDD
-2.0
+2.0
μA
Input low voltage
VIL
VDD*0.3
V
Input high voltage
VIH
(when either Bank1 or Bank2 is read)
Supply current at reading
(when both Bank1 and Bank2 are read
simultaneously)
VOL
Output low level voltage
0.7
VDD*0.7
V
IOL=0.7mA, VDD=2.5V
0.2
V
IOL=3.0mA, VDD=2.5V
0.4
V
IOL=3.0mA, VDD=5.5V
0.4
V
IOL=6.0mA, VDD=4.5V
0.6
V
Capacitance/Ta=25°C, f=100kHz
Parameter
Symbol
Conditions
min
typ
max
Unit
In/Output capacitance
CI/O
VI/O=0V (SDA1, SDA2, SDAC)
2
5
pF
Input capacitance
CI
VIN=0V (SCL1, SCL2, SCLC)
2
5
pF
Note: This parameter is sampled and not 100% tested.
AC Electric Characteristics
Fast Mode
Parameter
VDD=2.5V to 5.5V
Symbol
min
typ
unit
max
Slave mode SCL clock frequency
fSCLS
SCL clock low time
tLOW
1200
ns
SCL clock high time
tHIGH
600
ns
SDA output delay time
tAA
100
SDA data output hold time
tDH
100
ns
Start condition setup time
tSU.STA
600
ns
Start condition hold time
tHD.STA
600
ns
Data in setup time
tSU.DAT
100
ns
Data in hold time
tHD.DAT
0
ns
Stop condition setup time
tSU.STO
600
ns
SCL, SDA rise time
tR
300
SCL, SDA fall time
tF
300
Bus release time
tBUF
Noise suppression time
tSP
Write cycle time
tWC
400
900
1200
kHz
ns
ns
ns
ns
100
ns
5
ms
No.1811-4/20
LE24CBK222
Standard Mode
Parameter
VDD=2.5V to 5.5V
Symbol
min
unit
typ
max
Slave mode SCL clock frequency
fSCLS
SCL clock low time
tLOW
4700
100
kHz
SCL clock high time
tHIGH
4000
SDA output delay time
tAA
100
SDA data output hold time
tDH
100
ns
ns
ns
ns
3500
ns
Start condition setup time
tSU.STA
4700
Start condition hold time
tHD.STA
4000
ns
Data in setup time
tSU.DAT
250
ns
ns
Data in hold time
tHD.DAT
0
Stop condition setup time
tSU.STO
4000
SCL, SDA rise time
tR
1000
ns
SCL, SDA fall time
tF
300
ns
Bus release time
tBUF
Noise suppression time
tSP
Write cycle time
tWC
ns
4700
ns
100
ns
5
ms
Bus Timing
tF
tHIGH
tLOW
tR
SCL
tSP
tSU.STA
tHD.STA
tHD.DAT
tHD.STA
tSU.STO
SDA/IN
tSP
tBUF
tDH
tAA
SDA/OUT
Write Timing
tWC
SCL
SDA
D0
Write data
Acknowledge
Stop
condition
Start
condition
No.1811-5/20
LE24CBK222
Pin Functions
(Port1: For Bank1)
SCL1 (serial clock input) pin
The SCL1 pin is the serial clock input pin used to access the Bank1 area, and processes signals at the rising and falling
edges of the SCL1 clock signal.
This pin must be pulled up by a resistor to the VDD level, and wired-ORed with another open drain (or open collector)
output device for use.
While this product is being accessed from the control port, it cannot be accessed from port 1.
SDA1 (serial data input/output) pin
The SDA1 pin is used to transfer serial data to the input/output of the Bank1 side area and it consists of a signal input
pin and n-channel transistor open drain output pin.
Like the SCL1 line, the SDA1 line must be pulled up by a resistor to the VDD level and wired-ORed with another
open drain (or open collector) output device for use.
While this product is being accessed from the control port, it cannot be accessed from port 1.
(Port2: For Bank2)
SCL2 (serial clock input) pin
The SCL2 pin is the serial clock input pin used to access the Bank2 area, and processes signals at the rising and falling
edges of the SCL2 clock signal.
This pin must be pulled up by a resistor to the VDD level, and wired-ORed with another open drain (or open collector)
output device for use.
While this product is being accessed from the control port, it cannot be accessed from port 2.
SDA2 (serial data input/output) pin
The SDA2 pin is used to transfer serial data to the input/output of the Bank2 side area and it consists of a signal input
pin and n-channel transistor open drain output pin.
Like the SCL2 line, the SDA2 line must be pulled up by a resistor to the VDD level and wired-ORed with another
open drain (or open collector) output device for use.
While this product is being accessed from the control port, it cannot be accessed from port 2.
(Control port: For accessing both banks and for accessing the configuration area)
SCLC (serial clock input) pin
The SCLC pin is the serial clock input pin used for accessing both the Bank1 and Bank2 areas and the configuration
area. The signals are processed at the rising and falling edges of the SCLC clock signal.
The pin must be pulled up by a resistor to the VDD level, and it is wired-ORed with another open drain (or open
collector) output device for use.
SDAC (serial data input/output) pin
The SDAC pin is used to transfer serial data to the input/output of both Bank1 and Bank2 areas and the configuration
area, and it consists of a signal input pin and n-channel transistor open drain output pin.
Like the SCLC line, the SDAC line must be pulled up by a resistor to the VDD level, and it is wired-ORed with another
open drain (or open collector) output device for use.
No.1811-6/20
LE24CBK222
Functional Description
1. Start condition
When the SCL line is at the high level, the start condition is established by changing the SDA line from high to low.
The operation of the EEPROM as a slave starts in the start condition.
2. Stop condition
When the SCL line is at the high level, the stop condition is established by changing the SDA line from low to high.
When the device is set up for the read sequence, the read operation is suspended when the stop condition is received,
and the device is set to standby mode. When it is set up for the write sequence, the capture of the write data is ended
when the stop condition is received, and the EEPROM internal write operation is started.
tSU.STA
tHD.STA
tSU.STO
SCL
SDA
Stop
condition
Start
condition
3. Data transfer
Data is transferred by changing the SDA line while the SCL line is low. When the SDA line is changed while the SCL
line is high, the resulting condition will be recognized as the start or stop condition.
tSU.DAT
tHD.DAT
SCL
SDA
4. Acknowledge
During data transfer, 8 bits are transferred in succession, and then in the ninth clock cycle period the device on the
system bus receiving the data sets the SDA line to low, and sends the acknowledge signal indicating that the data has
been received. The acknowledge signal is not sent during an EEPROM internal write operation.
SCL
(EEPROM input)
1
8
9
SDA
(Master output)
SDA
(EEPROM output)
Start
condition
Acknowledge
bit output
tAA
tDH
No.1811-7/20
LE24CBK222
5. Device addressing
For the purposes of communication, the master device in the system generates the start condition for the slave device.
Communication with a particular slave device is enabled by sending along the SDA bus the device address, which is 7
bits long, and the read/write command code, which is 1 bit long, immediately following the start condition.
The upper four bits of the device address are called the device code which, for this product, are fixed at “1010b.”
The 3-bit slave address (SA2, SA1, and SA0 for access from port 1; SB2, SB1, and SB0 for access from port 2; SC2
and SC1for access from the control port) following the device code are stored in the configuration area, and any
values can be set for these addresses. However, the device address to be used to access the configuration area is fixed
at “1011_100b” and cannot be changed.
When the device code input from SDA and the slave addresses are compared with the product’s device code and
configuration area that were set at the mounting stage and found to match, the product sends the acknowledge signal
during the ninth clock cycle period, and initiates the read or write operation in accordance with the read or write
command code. If they do not match, the EEPROM returns to standby mode. When a read operation is performed
immediately after the slave device has been switched, the random read command must be used.
Slave
Address
Device code
Port 1
1
0
MSB
Port 2
1
1
0
SA2
SA1
SA0
LSB
Device Address word
0
1
0
SB2
SB1
SB0
MSB
Control Port
(When you access
Bank1, Bank2)
1
1
MSB
R/W
LSB
0
1
0
SC2
SC1
MSB
Control Port
(When you access
configuration area)
R/W
A8*
R/W
LSB
*A8=0:Bank1 access
A8=1:Bank2 access
0
1
1
1
0
0
R/W
LSB
The slave addresses are set as follows when this product is shipped.
(SA2, SA1, SA0) = (0, 0, 0)
(SB2, SB1, SB0) = (0, 0, 0)
(SC2, SC1) = (0, 0)
No.1811-8/20
LE24CBK222
6 Internal mode
This product functions in bank mode when it is accessed from port 1 or port 2 and in combined mode when it is
accessed from the control port.
6-1. Bank mode
The EEPOM functions in the bank mode when it is accessed from port 1 or port 2. In the bank mode, Bank1 is
controlled from the port 1 pins (SCL1, SDA1), and Bank2 is controlled from the port 2 pins (SCL2, SDA2).
When read operations are performed, the two banks can be controlled independently of each other, and access to
different addresses can be made at the same time. This enables the EEPROM to be handled as two independent
EEPROM devices incorporated in a single package. In turn, this makes it possible for the Bank1 and Bank2 sides to
be connected to the MCU of separate systems.
When write operations are performed, it is not possible to write data in two banks at the same time. After the write
data has been input into one of the banks and the internal rewriting operation has started, access to the two banks is
not possible during the write time tWC period.
LE24CBK222
SCL1
SDA1
00h
Bank1
(2k-bit)
FFh
SCL2
SDA2
00h
Bank2
(2k-bit)
FFh
6-2. Combine mode
The EEPROM functions in the combined mode when it is accessed from the control port. In the combined mode,
Bank1 and Bank2 are controlled from the control port pins (SCLC, SDAC). The combined mode uses the two-bank
configuration (2K bits + 2K bits) as a pseudo-one-bank configuration (4K bits). Since the memory area is processed
as a single 4K-bit bank in this mode, the MSB address changes from A7 to A8. Input A8=0 to control the Bank1 area,
and input A8=1 to control the Bank2 area.
When, in the combined mode, the last address (0FFh) of Bank1 has been reached in a sequential read operation, the
address (100h) in the Bank2 side is sequentially read. Similarly, when the last address (1FFh) of Bank2 has been
reached, it is rolled over to the Bank1 address (000h) and continues to be read into this address.
Data correlation is guaranteed between the bank mode and combined mode, enabling operations while switching the
mode such as performing write in the combined mode and read in the bank mode.
While the EEPROM is functioning in the combined mode, access from port 1 and port 2 is disabled. In the bank
mode, the read operation stops while data is being read from the ports. And, in the bank mode, while the data of one
of the banks is being written, access from the control port is disabled until the internal write operation is completed.
LE24CBK222
SCLC
SDAC
000h
Bank1
(2k-bit)
0FFh
100h
SCL1
SDA1
SCL2
SDA2
Bank2
(2k-bit)
1FFh
No.1811-9/20
LE24CBK222
Fig.: configuration area memory map
address
0h
1h
2h
3h
4h
5h
6h
7h
8h
9h
Ah
Bh
Ch
Dh
Eh
Fh
Bit7
×
×
×
Bit6
×
×
×
Bit5
×
×
×
×
×
×
×
×
×
×
×
×
Bit4
Bit3
Bit2
Slv_ENBC
×
SC2
Slv_ENB1
×
SA2
Slv_ENB2
×
SB2
Reserved R/W
Reserved R/W
Reserved R/W
Reserved R/W
Reserved R/W
×
×
×
×
×
×
×
×
×
Reserved R/W
Reserved R/W
Reserved R/W
Reserved R/W
Device Revision (Reserved R only)
Bit1
SC1
SA1
SB1
Bit0
×
SA0
SB0
PB1C
PB1A
PB1B
PB0C
PB0A
PB0B
7. Configuration area
This product has a configuration area equivalent to 16 addresses that is separate from Bank1 and Bank2. Refer to the
above table for the memory map of the configuration area. Access to the configuration area is performed by inputting
device address “1011_100b” from the control port.
7-1. Slave address bits (SA2, SA1, SA0, SB2, SB1, SB0, SC2, SC1)
The slave address bits are used to set the slave address in the device address. This product does not have slave
address pins, but has slave address bits inside instead. By changing the values of these bits, it is possible to change
the slave addresses at any time. Each port contains a slave address bit, and a different slave address can be assigned
to the ports.
Port
Port 1
Port 2
Control Port
Slave address bit
SA2, SA1, SA0
SB2, SB1, SB0
SC2, SC1
7-2. Slave address enable bits (Slv_ENB1, Slv_ENB2, Slv_ENBC)
The slave address enable bits (Slv_ENB) are used to enable or disable the slave addresses of the ports, which have
been set in the configuration area. When Slv_ENB=”0,” the slave address bits of the ports which have been set in the
configuration area are disabled, and the slave address value input in the device address is don’t care. When another
slave device exists on the same bus as the EEPROM, Slv_ENB=”1” must be set without fail.
Port
Port 1
Port 2
Control Port
Slave address enable bit
Slv_ENB1
Slv_ENB2
Slv_ENBC
7-3. Protect bits (PB1A, PB0A, PB1B, PB0B, PB1C, PB0C)
The protect bits are used to set the access level. The value of the protect bits determine whether the product is to be
protected against read and write operations. The protect bits can be set for each port.
PB1n
0
0
1
1
PB0n
0
1
0
1
access level
access inhibit
Read write prohibition. Only the acknowledge response.
Write prohibition. Only the read.
Read write possible.
7-4. Reserved R/W
The bits in addresses 3h to 7h and Bh to Eh in the configuration area are reserved bits, and have no significance.
Read and write are possible in the areas with these addresses, but it is recommended that the areas not be used.
7-5. Device revision
The revision code of this product is stored in the Fh address of the configuration area. It is read-only and cannot be
rewritten with a write operation.
No.1811-10/20
LE24CBK222
8 EEPROM write operation
8-1. Byte writing
When the EEPROM receives the 7-bit device address and write command code “0” after the start condition, it
generates an acknowledge signal. After this, if it receives the 8-bit word address, generates an acknowledge signal,
receives the 8-bit write data, generates an acknowledge signal and then receives the stop condition, the internal write
operation of the EEPROM in the designated memory address will start. Rewriting is completed in the tWC period
after the stop condition. During an EEPROM internal write operation, no input is accepted and no acknowledge
signals are generated.
SDA
1
0
1
S0
0 S2 S1 / W
A8
Word Address
Data
A7 A6 A5 A4 A3 A2 A1 A0
D7 D6 D5 D4 D3 D2 D1 D0
Stop
Start
Device Address
ACK
ACK
ACK
R/W
S2, S1, S0 : Slave Address
A8 : Bank selecting address used during control port access
Access from master
8-2. Page writing
This product enables pages with up to 16 bytes to be written. The basic data transfer procedure is the same as for byte
writing: Following the start condition, the 7-bit device address and write command code “0,” word address (n), and
data (n) are input in this order while confirming acknowledge “0” every 9 bits. The page write mode is established if,
after data (n) is input, the write data (n+1) is input without inputting the stop condition. After this, the write data
equivalent to the largest page size can be received by a continuous process of repeating the receiving of the 8-bit
write data and generating the acknowledge signals.
At the point when the write data (n+1) has been input, the lower 4 bits (A0-A3) of the word addresses are
automatically incremented to form the (n+1) address. In this way, the write data can be successively input, and the
word address on the page is incremented each time the write data is input. If the write data exceeds 16 bytes or the
last address of the page is exceeded, the word address on the page is rolled over. Write data will be input into the
same address two or more times, but in such cases the write data that was input last will take effect. Finally, the
EEPROM internal write operation corresponding to the page size for which the write data is received starts from the
designated memory address when the stop condition is received.
SDA
Start
Device Address
1
0
1
Word Address
S0
0 S2 S1 / W
A8
Data(n)
A7 A6 A5 A4 A3 A2 A1 A0
ACK
R/W
Data(n+1)
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6
ACK
ACK
D1 D0
ACK
D7 D6
D1 D0
D7 D6
D1 D0
ACK
S2, S1, S0 : Slave Address
A8 : Bank selecting address used during control port access
D7 D6
D1 D0
D7 D6
ACK
D1 D0
Stop
Data(n+x)
ACK
Access from master
No.1811-11/20
LE24CBK222
8-3. Acknowledge polling
Acknowledge polling is used to find out when the EEPROM internal write operation is completed. When the stop
condition is received and the EEPROM starts rewriting, all operations are prohibited, and no response can be given to
the signals sent by the master device. Therefore, in order to find out when the EEPROM internal write operation is
completed, the start condition, device address and write command code are sent from the master device to the
EEPROM (slave device), and the response of the slave device is detected.
In other words, if the slave device does not send the acknowledge signal, it means that the internal write operation is
in progress; conversely, if it does send the acknowledge signal, it means that the internal write operation has been
completed.
0
1
S0
0 S2 S1 / W
A8
1
During Write
0
1
S0
0 S2 S1 / W
A8
NO ACK
R/W
S2, S1, S0 : Slave Address
A8 : Bank selecting address used during control port access
NO ACK
R/W
End of Write
Start
1
Start
SDA
Start
During Write
1
0
1
S0
0 S2 S1 / W
A8
ACK
R/W
Access from master
No.1811-12/20
LE24CBK222
9 EEPROM read operations
9-1. Current address reading
The address equivalent to the memory address accessed last +1 is held as the internal address of the EEPROM for
both write* and read operations. Therefore, provided that the master device has recognized the position of the
EEPROM address pointer, data can be read from the memory address with the current address pointer without
specifying the word address.
As with writing, current address reading involves receiving the 7-bit device address and read command code “1”
following the start condition, at which time the EEPROM generates an acknowledge signal. After this, the 8-bit data
of the (n+1) address is output serially starting with the highest bits. After the 8 bits have been output, by not sending
an acknowledge signal and inputting the stop condition, the EEPROM completes the read operation and is set to
standby mode.
If the previous read address is the last address, the address for the current address reading is rolled over to become
address 0.
* The current address assigned after a page write is the number of bytes written at the designated word address
plus 1 if the volume of the write data is greater than 1 byte or less than or equal to 16 bytes, and is the designated
word address if the volume of the write data is 16 bytes or more. If the last address of the page (A3 to A0 =
1111b) is specified as the word address for a byte write, the internal address after the write becomes the first
address in that page (A3 to A0 = 0000b).
1
0
1
S0
0 S2 S1 / R
A8
Data(Current Address)
Stop
SDA
Start
Device Address
D7 D6 D5 D4 D3 D2 D1 D0
NO ACK
ACK
R/W
S2, S1, S0 : Slave Address
A8 : Bank selecting address used during control port access
Access from master
9-2. Random read
Random read is a mode in which any memory address is specified and its data read. The address is specified by a
dummy write input.
First, when the EEPROM receives the 7-bit device address and write command code “0” following the start condition,
it generates an acknowledge signal. It then receives the 8-bit word address, and generates an acknowledge signal.
Through these operations, the word address is loaded into the address counter inside the EEPROM.
Next, the start condition is input again and the current read is initiated. This causes the data of the word address that
was input using the dummy write input to be output. If, after the data is output, an acknowledge signal is not sent and
the stop condition is input, reading is completed, and the EEPROM returns to standby mode.
0
1
S0
0 S2 S1 / W
A8
A7 A6 A5 A4 A3 A2 A1 A0
ACK
R/W
Dummy Write
S2, S1, S0 : Slave Address
A8 : Bank selecting address used during control port access
1
ACK
0
1
Data(n)
S0
0 S2 S1 / R
A8
D7
D0
ACK
R/W
Stop
1
Device Address
Word Address
Start
SDA
Start
Device Address
NO ACK
Current Address Read
Access from master
No.1811-13/20
LE24CBK222
9-3. Sequential read
In this mode, the data is read continuously, and sequential read operations can be performed with both current address
read and random read. If, after the 8-bit data has been output, acknowledge “0” is input and reading is continued
without issuing the stop condition, the address is incremented, and the data of the next address is output.
If acknowledge “0” continues to be input after the data has been output in this way, the data is successively output
while the address is incremented. When the last address is reached, it is rolled over to address 0, and the data
continues to be read. As with current address read and random read, the operation is completed by inputting the stop
condition without sending an acknowledge signal.
*: For accesses from port 1 or port 2, the last address is FFh and for accesses to Bank1 or Bank2 from the control port,
it is 1FFh. And, for accesses to the configuration area, the last address is Fh.
1
0
1
S0
0 S2 S1 / R
A8
Data(n)
D7 D6
D1 D0
ACK
R/W
S2, S1, S0 : Slave Address
A8 : Bank selecting address used during control port access
Data(n+x)
Data(n+1)
D7 D6
ACK
D1 D0
D7 D6
ACK
D1 D0
Stop
SDA
Start
Device Address
NO ACK
Access from master
10. Operations during protect
The access level can be set for each port by using the values of the protect bits stored in the configuration area.
However, access to the configuration area from the control port (device address 1011_100b) is always enabled
regardless of the access level of the control port.
10-1. Access disabled state (PB1n=0, PB0n=0)
When the protect bits in the configuration area are set to”00b,” all the operations from the corresponding port are
protected, and the access from the port is disabled. When a read or write operation is input from a port in this state,
the product does not start the operation and enters the standby state. In addition, it does not return an acknowledge
signal.
10-2. Read/write disabled state (PB1n=0, PB0n=1)
When the protect bits in the configuration area are set to “01b,” the read and write operations from the corresponding
port are protected. When a read or write operation is input from a port in this state, the product returns an
acknowledge signal and enters the standby state without initiating a read or write operation.
*: In read operations, the product generates an acknowledge signal on the high-to-low transition of the SCL clock in
the 9th cycle from the start condition. It enters the standby state on the low-to-high transition of the SCL clock in the
same cycle.
10-3. Write prohibited state (PB1n=1, PB0n=0)
When the protect bits in the configuration area are set to “10b,” the write operations from the corresponding port are
protected. When a write operation is input from a port in this state, the product returns an acknowledge signal and
enters the standby state without initiating a write operation.
10-4. Read/write enabled state (PB1n=1, PB0n=1)
When the protect bits in the configuration area are set to “11b,” the read operations and write operations from the
corresponding port are enabled.
No.1811-14/20
LE24CBK222
Application Notes
1) Software reset function
Software reset (start condition + 9 dummy clock cycles + start condition), shown in the figure below, is executed in
order to avoid erroneous operation after power-on and to reset while the command input sequence. During the
dummy clock input period, the SDA bus must be opened (set to high by a pull-up resistor). Since it is possible for
the ACK output and read data to be output from the EEPROM during the dummy clock period, forcibly entering H
will result in an overcurrent flow.
Note that this software reset function does not work during the internal write cycle.
Dummy clock ×9
SCL
1
2
8
9
SDA
Start
condition
Start
condition
2) Pull-up resistor of SDA pin
Due to the demands of the I2C bus protocol function, the SDA pin must be connected to a pull-up resistor (with a
resistance from several kΩ to several tens of kΩ) without fail. The appropriate value must be selected for this
resistance (RPU) on the basis of the VIL and IIL of the microcontroller and other devices controlling this product as
well as the VOL–IOL characteristics of the product. Generally, when the resistance is too high, the operating
frequency will be restricted; conversely, when it is too low, the operating current consumption will increase.
RPU maximum resistance
The maximum resistance must be set in such a way that the bus potential, which is determined by the sum total (IL)
of the input leaks of the devices connected to the SDA bus and by RPU, can completely satisfy the input high level
(VIH min) of the microcontroller and EEPROM. However, a resistance value that satisfies SDA rise time tR and fall
time tF must be set.
RPU maximum value = (VDD - VIH)/IL
Example: When VDD=3.0V and IL= 2μA
RPU maximum value = (3.0V − 3.0V × 0.8)/2μA = 300kΩ
RPU minimum value
A resistance corresponding to the low-level output
voltage (VOL max) of SANYO’s EEPROM must be set.
RPU minimum value = (VDD − VOL)/IOL
RPU
SDA
Master
Device
IL
EEPROM
CBUS
IL
Example: When VDD=3.0V, VOL = 0.4V and IOL = 1mA
RPU minimum value = (3.0V − 0.4)/1mA = 2.6kΩ
Recommended RPU setting
RPU is set to strike a good balance between the operating frequency requirements and power consumption. If it is
assumed that the SDA load capacitance is 50pF and the SDA output data strobe time is 500ns, RPU will be about
RPU = 500ns/50pF = 10kΩ.
No.1811-15/20
LE24CBK222
3) Precautions when turning on the power
This product contains a power-on reset circuit for preventing the inadvertent writing of data when the power is
turned on. The following conditions must be met in order to ensure stable operation of this circuit. No data
guarantees are given in the event of an instantaneous power failure during the internal write operation.
Item
VDD=2.5 to 5.5V
Symbol
min
Power rise time
tRISE
Power off time
tOFF
Power bottom voltage
Vbot
typ
unit
max
100
10
ms
ms
0.2
V
tRISE
VDD
tOFF
Vbot
0V
Notes:
1) The SDA pin must be set to high and the SCL pin to low or high.
2) Steps must be taken to ensure that the SDA and SCL pins are not placed in a high-impedance state.
A. If it is not possible to satisfy the instruction 1 in Note above, and SDA is set to low during power rise
After the power has stabilized, the SCL and SDA pins must be controlled as shown below, with both pins set to high.
VDD
VDD
tLOW
SCL
SCL
SDA
SDA
tDH
tSU.DAT
tSU.DAT
B. If it is not possible to satisfy the instruction 2 in Note above
After the power has stabilized, software reset must be executed.
C. If it is not possible to satisfy the instructions both 1 and 2 in Note above
After the power has stabilized, the steps in A must be executed, then software reset must be executed.
4) Noise filter for the SCL and SDA pins
This product contains a filter circuit for eliminating noise at the SCL and SDA pins. Pulses of 100ns or less are not
recognized because of this function.
5) Function to inhibit writing when supply voltage is low
This product contains a supply voltage monitoring circuit that inhibits inadvertent writing below the guaranteed
operating supply voltage range. The data is protected by ensuring that write operations are not started at voltages
(typ.) of 1.3V and below.
6) Initial values in the configuration
The slave address values as well as the slave address enable bit and protect bit values of the ports are stored in the
configuration area. These values are set as follows when the EEPROM is shipped:
- Slave address values: “000b” for all ports
- Slave address enable bits: “1b” for all ports (enabled)
- Protect bit values: “11b” for all ports (no protection)
When these values are to be changed, input the device address “1011_100b” from the control port, and perform the
write operation.
No.1811-16/20
LE24CBK222
7) Precautions when changing the mode
This product enables to actively change the bank accessing mode during period in which no write operation is
performed between the bank operation mode (access from port 1 or port 2 to Bank1 or Bank2) and the combined
operation mode (access from the control port to both banks). However, the current address value for each mode is not
held internally. When conducting read operations after changing the mode, random access read must be performed
without fail.
When switching the bank accessing mode, start the operations in the next mode after the operations in the previous
mode have been completed (when the stop condition is input or no acknowledge “0” input for a sequential read).
8) Writing with a ROM writer from the control port
This product enables two-bank configuration (2K bits + 2K bits) to be used as a pseudo-one-bank configuration (4K
bits) by accessing the memory areas from the control port (SCLC, SDAC). As a result, data can be written using a
ROM writer with the EEPROM serving as a regular 4K-bit EEPROM. Fix the port 1 and port 2 pins to high or low.
LE24C04x
(Standard 4k-bit EEPROM)
LE24CBK222
SCL1
1
8
VDD
S0
1
8
VDD
SDA1
2
7
SCL2
S1
2
7
WP
SDA2
3
6
SCLC
S2
3
6
SCL
GND
4
5
SDAC
GND
4
5
SDA
ROM writer connection example
LE24CBK222
SCL1
1
8
VDD
SDA1
2
7
SCL2
SDA2
3
6
SCLC
GND
4
5
SDAC
Memory Area (4K-bit)
000h
Bank1
(2k-bit)
A8=0
Bank2
(2k-bit)
A8=1
The MSB address in combined mode is A8. A8 is used to select the
Bank1 or Bank2 area. Set A8 = 0 to control the Bank1 area, or A8 = 1
to control the Bank2 area.
0FFh
100h
1FFh
No.1811-17/20
LE24CBK222
10) System Configuration Image
(HDMI System)
HDMI
connector
This product can support two HDMI ports simultaneously. Both ports can be accessed at the same time when
performing read operations of the ports. All the data can be written together from a image processor into the areas
allocated to the two ports from the control port in a single operation.
DDC
Port 1
LE24CBK222
Port 2
Control Port
I2C
Image
Processor
HDMI Switch
Level Shifter
HDMI
connector
TMDS
DDC
HDMI
Receiver
Level Shifter
TMDS
LCD-TV
No.1811-18/20
LE24CBK222
10) Peripheral Circuit Diagram
Example of connection with HDMI receiver
VDD(3V)*1
*2
DDC+5V
*2
*4 RPU
DDC_CLK
HDMI
Connector
8:VDD
DDC_DAT
LE24CBK222
GND
1:SCL1
VDD(3V)
2:SDA1
*2
6:SCLC
DDC+5V
Controller
*4 RPU
5:SDAC
DDC_CLK
HDMI
Connector
7:SCL2
DDC_DAT
3:SDA2
GND
4:GND
*4 RPU
SCL1
SDA1
SCL2
SDA2
HDMI
Switch
*3
(Level Shifter)
VDD(3V)
HDMI
Recever
SCL(3V)
SDA(3V)
*1: System power supply (3V) for HDMI receiver, etc.
*2: Reverse-current preventing diode
This device can be operated by supplying power from any of the connected HDMI connectors (DDC + 5V) or the
system power supply (3V). However, the supply voltage must be set so that the voltage stepped-down by the
reverse-current preventing diode is within the guaranteed operation voltage range of this device.
*3: Level shifter
When connecting the 5V HDMI connector side with a 3V system, level shifters must generally be inserted. However,
this is not necessary when the HDMI receiver supports 5V input signals.
*4: Pull-up resistors for the I2C and DDC interfaces.
See item 2) in the Application Notes for the resistance value settings.
No.1811-19/20
LE24CBK222
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellectual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of January, 2011. Specifications and information herein are subject
to change without notice.
PS No.1811-20/20