DS28CN01 Datasheet PDF - Maxim Integrated Products
| Part Number | DS28CN01 | |
| Description | 1Kbit I2C/SMBus EEPROM | |
| Manufacturers | Maxim Integrated Products | |
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Rev 2; 11/09
ABRIDGED DATA SHEET
1Kb I2C/SMBus EEPROM with SHA-1 Engine
General Description
The DS28CN01 combines 1024 bits of EEPROM with
challenge-and-response authentication security imple-
mented with the Federal Information Publications (FIPS)
180-1/180-2 and ISO/IEC 10118-3 Secure Hash
Algorithm (SHA-1). The memory is organized as four
32-byte pages. Data copy protection and EPROM emu-
lation features are supported for each memory page.
Each DS28CN01 has a guaranteed unique factory-pro-
grammed 64-bit registration number. Communication with
the DS28CN01 is accomplished through an industry-
standard I2C-compatible and SMBus™-compatible
interface. The SMBus timeout feature resets the
device’s interface if a bus-timeout fault condition is
detected.
Applications
PCB Unique Serialization
Accessory and Peripheral Identification
Equipment Registration and License
Management
Network Node Identification
Printer Cartridge Configuration and Monitoring
Medical Sensor Authentication and Calibration
System Intellectual Property Protection
Pin Configuration
TOP VIEW
AD0 1
AD1 2
N.C. 3
GND 4
+
DS28CN01
μSOP
8 VCC
7 N.C.
6 SCL
5 SDA
Features
♦ 1024 Bits of EEPROM Memory Partitioned Into
Four Pages of 256 Bits
♦ Dedicated Hardware-Accelerated SHA-1 Engine
for Generating SHA-1 MACs
♦ EEPROM Memory Pages Can Be Individually
Copy Protected or Put Into EPROM Mode
(Program from 1 to 0 Only)
♦ Write Access Requires Knowledge of the Secret
and the Capability of Computing and Transmitting
a 160-Bit MAC as Authorization
♦ Unique, Factory-Programmed, and Tested 64-Bit
Registration Number Assures Absolute
Traceability Because No Two Parts are Alike
♦ Endurance 200,000 Cycles at +25°C
♦ Serial Interface User Programmable for I2C Bus
and SMBus Compatibility
♦ Supports 100kHz and 400kHz I2C Communication
Speeds
♦ +5.5V Tolerant Interface Pins
♦ Operating Ranges: +1.62V to +5.5V, -40°C to +85°C
♦ 8-Pin µSOP Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
DS28CN01U-A00+ -40°C to +85°C 8 μSOP
DS28CN01U-A00+T -40°C to +85°C 8 μSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Circuit appears at end of data sheet.
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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ABRIDGED DATA SHEET
1Kb I2C/SMBus EEPROM with SHA-1 Engine
Block Diagram
VCC
AD_
SCL I2C/SMBUS
SDA FUNCTION
CONTROL
MAC OUTPUT
BUFFER
MEMORY AND
SHA-1 ENGINE
CONTROL
MAC
COMPARATOR
8-BYTE WRITE
BUFFER
DS28CN01
64-BIT UNIQUE
NUMBER
SHA-1
ENGINE
SECRET
MEMORY
REGISTER
PAGE
USER EEPROM
4 PAGES
OF 32 BYTES
Slave Address/Direction Byte
To be individually accessed, each device must have a
slave address that does not conflict with other devices
on the bus. The slave address to which the DS28CN01
responds is shown in Figure 1. The slave address is
part of the slave-address/direction byte. The upper 3
bits of the DS28CN01 slave address are set to 101b.
The AD0 pin controls address A0 and A1; AD1 controls
A2 and A3. AD0 and AD1 can be connected to GND,
VCC, SCL, or SDA. Table 1 shows the translation of
these four pin states to binary addresses. To be select-
ed, the device must be addressed with A0 to A3 match-
ing the binary address of the respective pins.
The last bit of the slave-address/direction byte (R/W)
defines the data direction. When set to a 0, subsequent
data flows from master to slave (write-access mode);
when set to a 1, data flows from slave to master (read-
access mode).
7-BIT SLAVE ADDRESS
A6 A5 A4 A3 A2 A1 A0
101
AD1
AD0 R/W
4-LEVEL PIN STATES
MSB
(SEE THE SLAVE
DETERMINES
ADDRESS/DIRECTION READ OR WRITE
BYTE SECTION)
Table 1. Pin State to Binary Translation
AD1
GND
VCC
SCL
SDA
A3
0
0
1
1
A2
0
1
0
1
AD0
GND
VCC
SCL
SDA
A1
0
0
1
1
A0
0
1
0
1
Figure 1. Slave Address
_______________________________________________________________________________________ 5
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