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PDF DS28E02 Data sheet ( Hoja de datos )

Número de pieza DS28E02
Descripción 1-Wire SHA-1 Authenticator 1Kb EEPROM
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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1-Wire SHA-1 Authenticated 1Kb
EEPROM with 1.8V Operation
General Description
The DS28E02 combines 1024 bits of EEPROM with
challenge-and-response authentication security imple-
mented with the FIPS 180-3 Secure Hash Algorithm
(SHA-1). The 1024-bit EEPROM array is configured as
four pages of 256 bits with a 64-bit scratchpad to per-
form write operations. All memory pages can be write
protected, and one page can be put in EPROM-emula-
tion mode, where bits can only be changed from a 1 to
a 0 state. Each DS28E02 has its own guaranteed
unique 64-bit ROM registration number that is factory
installed into the chip. The DS28E02 communicates
over the single-contact 1-Wire® bus. The communica-
tion follows the standard 1-Wire protocol with the regis-
tration number acting as the node address in the case
of a multidevice 1-Wire network.
Applications
Reference Design License Management
System Intellectual Property Protection
Sensor/Accessory Authentication and Calibration
Medical Consumable Authentication
Printer Cartridge Configuration and Monitoring
Typical Operating Circuit
VCC
μC
RPUP
IO
DS28E02
GND
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 12.5kbps or 35.7kbps Using 1-Wire
Protocol
Switchpoint Hysteresis and Filtering to Optimize
Communication Performance in the Presence of
Noise
Reads and Writes Over 1.75V to 3.65V Voltage
Range from -20°C to +85°C
6-Lead TSOC and TDFN Packages
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS28E02P+
DS28E02P+T&R
-20°C to +85°C
-20°C to +85°C
6 TSOC
6 TSOC
DS28E02Q+T&R
-20°C to +85°C
6 TDFN-EP*
(2.5k pcs)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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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DS28E02 pdf
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1-Wire SHA-1 Authenticated 1Kb
EEPROM with 1.8V Operation
PARASITE POWER
1-Wire NET
1-Wire FUNCTION
CONTROL
64-BIT
ROM
MEMORY AND
SHA-1 FUNCTION
CONTROL UNIT
512-BIT
SECURE HASH
ALGORITHM ENGINE
DS28E02
CRC16
GENERATOR
DATA MEMORY
4 PAGES OF
256 BITS EACH
REGISTER
PAGE
64-BIT
SCRATCHPAD
Figure 1. Block Diagram
or consumable authentication and calibration, and
printer cartridge configuration and monitoring.
Overview
The block diagram in Figure 1 shows the relationships
between the major control and memory sections of the
DS28E02. The DS28E02 has six main data compo-
nents: 64-bit ROM, 64-bit scratchpad, four 256-bit
pages of EEPROM, register page, and a 512-bit SHA-1
engine. Figure 2 shows the hierarchic structure of the
1-Wire protocol. The bus master must first provide one
of the seven ROM function commands: Read ROM,
Match ROM, Search ROM, Skip ROM, Resume
Communication, Overdrive-Skip ROM, or Overdrive-
Match ROM. Upon completion of an Overdrive-Skip
ROM or Overdrive-Match ROM command executed at
standard speed, the device enters overdrive mode
where all subsequent communication occurs at a higher
speed. The protocol required for these ROM function
commands is described in Figure 10. After a ROM
function command is successfully executed, the mem-
ory and SHA-1 functions become accessible and the
master can provide any one of the 9 available function
commands. The function protocols are described in
Figure 8. All data is read and written least signifi-
cant bit first.
64-Bit ROM
Each DS28E02 contains a unique ROM registration num-
ber 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
_______________________________________________________________________________________ 5

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DS28E02 arduino
ABRIDGED DATA SHEET
1-Wire SHA-1 Authenticated 1Kb
EEPROM with 1.8V Operation
www.DataSheet4U.com
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 DS28E02 is
a slave device. The bus master is typically a microcon-
troller. The discussion of this bus system is broken
down into three topics: hardware configuration, trans-
action sequence, and 1-Wire signaling (signal types
and timing). The 1-Wire protocol defines bus transac-
tions in terms of the bus state during specific time slots,
which are initiated on the falling edge of sync pulses
from the bus master.
22 ______________________________________________________________________________________

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