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DS28E10_11 Datasheet

Download or read online Maxim Integrated DS28E10_11 1-Wire SHA-1 Authenticator Irreversible Write Protection pdf datasheet.



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ABRIDGED DATA SHEET
219-0009; Rev 2; 4/11
General Description
The DS28E10 combines secure challenge-and-response
authentication functionality based on the FIPS 180-3
specified Secure Hash Algorithm (SHA-1) with 224 bits
of one-time programmable user EPROM in a single
chip. Once written, the memory is automatically write
protected. Additionally, each device has its own guaran-
teed unique 64-bit ROM identification number (ROM ID)
that is factory programmed into the chip. Memory writes
are performed 4 bytes at a time. A secure and low-cost
factory programming service is available to preprogram
device data, including the SHA-1 security data compo-
nents. The device communicates over the single-contact
1-Wire® bus. The communication follows the standard
1-Wire protocol with the ROM ID acting as 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
Ordering Information
PART
TEMP RANGE
DS28E10R+T
-40NC to +85NC
DS28E10P+
-40NC to +85NC
DS28E10P+T
-40NC to +85NC
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
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-Wire SHA-1 Authenticator
Dedicated Hardware-Accelerated SHA-1 Engine
S
for Generating SHA-1 MACs
One Page of 28 Bytes User OTP EPROM
S
Irreversible Write Protection
S
Unique, Factory-Programmed 64-Bit Identification
S
Number
1-Wire Interface for Standard and Overdrive Speed
S
Communicates with Host at Up to 15.4kbps at
S
Standard Speed or Up to 125kbps in Overdrive Mode
Operating Range from 2.8V to 3.6V, -40NC to +85NC
S
3-Lead SOT23, 6-Lead TSOC Package
S
±6kV Human Body Model (HBM) ESD Protection
S
(typ) on 1-Wire and V
Typical Operating Circuit
3.3V
V
CC
µC
PIN-PACKAGE
Px.1
3 SOT23
6 TSOC
6 TSOC
GND
Features
Pin
CC
V
CC
R
PUP
DS28E10
1-Wire
IO
GND

Summary of Contents

Page 1

... DS28E10PT -40NC to 85NC Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. 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 Maxims website at www.maxim-ic.com. 1-Wire SHA-1 Authenticator ...

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SHA-1 Authenticator ABSOLUTE MAXIMUM RATINGS IO Voltage to GND ... -0.5V, 7V IO Sink Current ...20mA V Voltage to GND ... -0.5V, 7V CC Operating Temperature Range ... -40NC to 85NC Stresses beyond those listed under Absolute Maximum Ratings ...

Page 3

ELECTRICAL CHARACTERISTICS (continued -40NC to 85NC, see Note 1.) A PARAMETER SYMBOL IO PIN: 1-Wire READ Read Low Time (Notes 4, 16) Read Sample Time (Notes 4, 16) EPROM Programming Current I Programming Time Programming Voltage Data Retention ...

Page 4

SHA-1 Authenticator TOP VIEW PIN NAME SOT23 TSOC GND — N.C. Detailed Description The DS28E10 combines a 512-bit SHA-1 engine, security data, ...

Page 5

IO (1-Wire) POWER V CC DISTRIBUTION GND DS28E10 Figure 1. Block Diagram COMMAND LEVEL: 1-Wire ROM FUNCTION COMMANDS DEVICE-SPECIFIC MEMORY FUNCTION COMMANDS Figure 2. Hierarchical Structure for 1-Wire Protocol MSB 8-BIT CRC CODE MSB LSB MSB Figure 3. 64-Bit ROM ...

Page 6

... User memory and special function registers are located in a linear address space, as shown in Figure 5. The user memory begins at address 0000h and ends at address 0017h. Refer to the full data sheet for additional information. i Button is a registered trademark of Maxim Integrated Products, Inc ...

Page 7

Bus System The 1-Wire bus is a system that has a single bus master and one or more slaves. In all instances the DS28E10 is a slave device. The bus master is typically a micro- controller. The discussion of ...

Page 8

SHA-1 Authenticator all slaves try to transmit at the same time (open drain produces a wired-AND result). The resultant family code and 48-bit serial number result in a mismatch of the CRC. Match ROM [55h] The Match ROM command, ...

Page 9

FROM MEMORY AND SHA-1 FUNCTION FLOWCHART (FIGURE 6) BUS MASTER Tx ROM FUNCTION COMMAND 33h READ ROM COMMAND DS28E10 Tx FAMILY CODE (1 BYTE) DS28E10 Tx SERIAL NUMBER (6 BYTES) DS28E10 Tx CRC BYTE Figure 8a. ...

Page 10

SHA-1 Authenticator TO FIGURE 8a A5h FROM FIGURE 8a RESUME COMMAND FROM FIGURE 8a TO FIGURE 8a NOTE: THE OD FLAG REMAINS THE DEVICE WAS ALREADY AT OVERDRIVE SPEED BEFORE THE OVERDRIVE-MATCH ROM ...

Page 11

Signaling The DS28E10 requires strict protocols to ensure data integrity. The protocol consists of four types of signaling on one line: reset sequence with reset pulse and pres- ence pulse, write-zero, write-one, and read-data. Except for the presence pulse, ...

Page 12

SHA-1 Authenticator WRITE-ONE TIME SLOT t W1L V PUP V IHMASTER RESISTOR WRITE-ZERO TIME SLOT V PUP V IHMASTER RESISTOR READ-DATA TIME SLOT t RL ...

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For a write-one time slot, the voltage on the data line must have crossed the V threshold before the write- IH one low time ...

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SHA-1 Authenticator Figure 12. Typical Circuit for EPROM Programming V PUP CASE A 0V Figure 13. Noise Suppression Scheme Search ROM command coming to a dead end or cause a device-specific function command to abort. ...

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DS28E10 to determine if the ID has been received error-free. The equivalent polynomial 8 5 function of this CRC received in the true (noninverted) form. The other CRC ...

Page 16

SHA-1 Authenticator Applications Information Power-Up Timing The DS28E10 is sensitive to the power-on slew rate and can inadvertently power up with incomplete initialization. When this occurs, the Read ROM command does not deliver a valid ROM ID and the ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2011 Maxim Integrated Products © ...

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