|
|
Número de pieza | DS28E02 | |
Descripción | 1-Wire SHA-1 Authenticator 1Kb EEPROM | |
Fabricantes | Maxim Integrated Products | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de DS28E02 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
No Preview Available ! Rev 0: 6/10
ABRIDGED DATA SHEET
www.DataSheet4U.com
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.
1 page ABRIDGED DATA SHEET www.DataSheet4U.com
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
5 Page 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 ______________________________________________________________________________________
11 Page |
Páginas | Total 21 Páginas | |
PDF Descargar | [ Datasheet DS28E02.PDF ] |
Número de pieza | Descripción | Fabricantes |
DS28E01-100 | 1K-Bit Protected 1-Wire EEPROM | Dallas Semiconductor |
DS28E01-100 | 1Kb Protected 1-Wire EEPROM | Maxim Integrated |
DS28E02 | 1-Wire SHA-1 Authenticator 1Kb EEPROM | Maxim Integrated Products |
DS28E04-100 | 4096-Bit Addressable 1-Wire EEPROM with PIO | Dallas Semiconducotr |
Número de pieza | Descripción | Fabricantes |
SLA6805M | High Voltage 3 phase Motor Driver IC. |
Sanken |
SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |