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DS28E01-100 Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer DS28E01-100
Beschreibung 1Kb Protected 1-Wire EEPROM
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 21 Seiten
DS28E01-100 Datasheet, Funktion
ABRIDGED DATA SHEET
DS28E01-100
1Kb Protected 1-Wire EEPROM
with SHA-1 Engine
General Description
The DS28E01-100 combines 1024 bits of EEPROM with
challenge-and-response authentication security imple-
mented with the ISO/IEC 10118-3 Secure Hash
Algorithm (SHA-1). The 1024-bit EEPROM array is con-
figured as four pages of 256 bits with a 64-bit scratch-
pad to perform write operations. All memory pages can
be write protected, and one page can be put in
EPROM-emulation mode, where bits can only be
changed from a 1 to a 0 state. Each DS28E01-100 has
its own guaranteed unique 64-bit ROM registration num-
ber that is factory lasered into the chip. The DS28E01-
100 communicates over the single-contact 1-Wire® bus.
The communication follows the standard 1-Wire protocol
with the registration number acting as the node address
in the case of a multidevice 1-Wire network.
Applications
Printer Cartridge Configuration and Monitoring
Medical Sensor Authentication and Calibration
System Intellectual Property Protection
Typical Operating Circuit
VCC
μC
RPUP
IO
DS28E01-100
GND
Pin Configurations appear at end of data sheet.
Features
1024 Bits of EEPROM Memory Partitioned Into
Four Pages of 256 Bits
On-Chip 512-Bit SHA-1 Engine to Compute 160-
Bit Message Authentication Codes (MACs) and to
Generate Secrets
Write Access Requires Knowledge of the Secret
and the Capability of Computing and Transmitting
a 160-Bit MAC as Authorization
User-Programmable Page Write Protection for
Page 0, Page 3, or All Four Pages Together
User-Programmable OTP EPROM Emulation Mode
for Page 1 (“Write to 0”)
Communicates to Host with a Single Digital
Signal at 15.3kbps or 90.9kbps Using 1-Wire
Protocol
Switchpoint Hysteresis and Filtering to Optimize
Performance in the Presence of Noise
Reads and Writes Over 2.8V to 5.25V Voltage
Range from -40°C to +85°C
6-Lead TSOC and TDFN or 2-Lead TO-92 and SFN
Packages
Ordering Information
PART
DS28E01-100+
DS28E01P-100+
DS28E01P-100+T
DS28E01G-100+T&R
DS28E01Q-100+T&R
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
2 TO-92
6 TSOC
6 TSOC
2 SFN
6 TDFN-EP*
(2.5k pcs)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T and T&R = Tape and reel.
*EP = Exposed pad.
Note to readers: This document is an abridged version of the full data sheet. To request the full data sheet, go to
www.maximintegrated.com/DS28E01 and click on Request Full Data Sheet.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
219-0007; Rev 8; 9/12






DS28E01-100 Datasheet, Funktion
ABRIDGED DATA SHEET
DS28E01-100
1Kb Protected 1-Wire EEPROM
with SHA-1 Engine
PARASITE POWER
1-Wire NET
1-Wire FUNCTION
CONTROL
64-BIT
LASERED ROM
MEMORY AND
SHA-1 FUNCTION
CONTROL UNIT
512-BIT
SECURE HASH
ALGORITHM ENGINE
DS28E01-100
CRC-16
GENERATOR
DATA MEMORY
4 PAGES OF
256 BITS EACH
REGISTER
PAGE
64-BIT
SCRATCHPAD
SECRETS
MEMORY 64 BITS
Figure 1. Block Diagram
64-Bit Lasered ROM
Each DS28E01-100 contains a unique ROM registration
number that is 64 bits long. The first 8 bits are a 1-Wire
family code. The next 48 bits are a unique serial number.
The last 8 bits are a cyclic redundancy check (CRC) of
the first 56 bits. See Figure 3 for details. The 1-Wire CRC
is generated using a polynomial generator consisting of
a shift register and XOR gates as shown in Figure 4. The
polynomial is X8 + X5 + X4 + 1. Additional information
about the 1-Wire CRC is available in Application Note
27: Understanding and Using Cyclic Redundancy
Checks with Maxim iButton® Products.
The shift register bits are initialized to 0. Then, starting
with the least significant bit of the family code, one bit
at a time is shifted in. After the 8th bit of the family code
has been entered, the serial number is entered. After
the 48th bit of the serial number has been entered, the
iButton is a registered trademark of Maxim Integrated
Products, Inc.
6
shift register contains the CRC value. Shifting in the 8
bits of the CRC returns the shift register to all 0s.
Memory Access
The DS28E01-100 has four memory areas: data memo-
ry, secrets memory, register page with special function
registers and user bytes, and a volatile scratchpad. The
data memory is organized as four pages of 32 bytes.
Secret and scratchpad are 8 bytes each. The scratch-
pad acts as a buffer when writing to the data memory,
loading the initial secret, or when writing to the register
page.
Refer to the full data sheet for this information.
Maxim Integrated

6 Page









DS28E01-100 pdf, datenblatt
ABRIDGED DATA SHEET
DS28E01-100
1Kb Protected 1-Wire EEPROM
with SHA-1 Engine
1-Wire Bus System
The 1-Wire bus is a system that has a single bus master
and one or more slaves. In all instances the DS28E01-
100 is a slave device. The bus master is typically a
microcontroller. The discussion of this bus system is
broken down into three topics: hardware configuration,
transaction sequence, and 1-Wire signaling (signal
types and timing). The 1-Wire protocol defines bus
transactions in terms of the bus state during specific
time slots, which are initiated on the falling edge of
sync pulses from the bus master.
Hardware Configuration
The 1-Wire bus has only a single line by definition; it is
important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device
attached to the 1-Wire bus must have open-drain or
three-state outputs. The 1-Wire port of the DS28E01-
100 is open drain with an internal circuit equivalent to
that shown in Figure 9.
A multidrop bus consists of a 1-Wire bus with multiple
slaves attached. The DS28E01-100 supports both a
standard and overdrive communication speed of
15.3kbps (max) and 90.9kbps (max), respectively. Note
BUS MASTER
Rx
Tx
OPEN-DRAIN
PORT PIN
VPUP
RPUP
Rx = RECEIVE
Tx = TRANSMIT
DS28E01-100 1-Wire PORT
DATA
Rx
IL Tx
100Ω MOSFET
Figure 9. Hardware Configuration
24 Maxim Integrated

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