DS28E10_11 datasheet(6/17 Pages) MAXIM

Part #	DS28E10

Description	1-Wire SHA-1 Authenticator Irreversible Write Protection

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Manufacturer	MAXIM [Maxim Integrated Products]

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1-Wire SHA-1 Authenticator

6

ABRIDGED DATA SHEET

64-Bit ROM ID

Each device contains a unique ROM ID 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

last bit of the serial number has been entered, the shift

register contains the CRC value. Shifting in the 8 bits of

the CRC returns the shift register to all 0s.

Memory

The device has three memory areas: user memory, secu-

rity data, and special function registers. 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.

The user-writeable memory is implemented in EPROM

technology. The factory-default state of the memory is

00h. During programming, bits of the target 4-byte block

can be changed to a 1 or a 0. Once a block is written,

the entire 4-byte block becomes automatically write pro-

tected. This means it is not possible to program a block

multiple times, e.g., to change a few bits at a time.

Memory and SHA-1 Function

Commands

This section describes the commands and flowcharts

needed to use the memory and SHA-1 engine of the

device. Refer to the full data sheet for more informa-

tion.

Figure 4. 1-Wire CRC Generator

iButton is a registered trademark of Maxim Integrated

Products, Inc.

1ST

STAGE

2ND

STAGE

3RD

STAGE

4TH

STAGE

7TH

STAGE

8TH

STAGE

6TH

STAGE

5TH

STAGE

X0

X1

X2

X3

X4

POLYNOMIAL = X8 + X5 + X4 + 1

INPUT DATA

X5

X6

X7

X8

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Similar Description - DS28E10_11

Manufacturer	Part #	Datasheet	Description
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