DS28E01G-100U datasheet(9/21 Pages) MAXIM

Part #	DS28E01G-100U

Description	1Kb Protected 1-Wire EEPROM with SHA-1 Engine

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Manufacturer	MAXIM [Maxim Integrated Products]

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1Kb Protected 1-Wire EEPROM

with SHA-1 Engine

ABRIDGED DATA SHEET

DS28E01-100

10

Maxim Integrated

valued bit of the E/S register, called authorization

accepted (AA), acts as a flag to indicate that the data

stored in the scratchpad has already been copied to

the target memory address. Writing data to the scratch-

pad clears this flag.

Writing with Verification

To write data to the DS28E01-100, the scratchpad must

be used as intermediate storage. First, the master

issues the Write Scratchpad command, which specifies

the desired target address and the data to be written to

the scratchpad. Note that writes to data memory must

be performed on 8-byte boundaries with the three LSBs

of the target address T[2:0] equal to 000b. Therefore, if

T[2:0] are sent with nonzero values, the device sets

these bits to 0 and uses the modified address as the

target address. The master should always send eight

complete data bytes. After the 8 bytes of data have

been transmitted, the master can elect to receive an

inverted CRC-16 of the Write Scratchpad command,

the address as sent by the master, and the data as sent

by the master. The master can compare the CRC to the

value it has calculated itself to determine if the commu-

nication was successful. After the scratchpad has been

written, the master should always perform a Read

Scratchpad to verify that the intended data was in fact

written. During a Read Scratchpad, the DS28E01-100

repeats the target address TA1 and TA2 and sends the

contents of the E/S register. The partial flag (bit 5 of the

E/S register) is set to 1 if the last data byte the

DS28E01-100 received during a Write Scratchpad or

Refresh Scratchpad command was incomplete, or if

there was a loss of power since data was last written to

the scratchpad. The authorization-accepted (AA) flag

(bit 7 of the E/S register) is normally cleared by a Write

Scratchpad or Refresh Scratchpad; therefore, if it is set

to 1, it indicates that the DS28E01-100 did not under-

stand the proceeding Write (or Refresh) Scratchpad

command. In either of these cases, the master should

rewrite the scratchpad. After the master receives the

E/S register, the scratchpad data is received. The

descriptions of Write Scratchpad and Refresh

Scratchpad provide clarification of what changes can

occur to the scratchpad data under certain conditions.

An inverted CRC of the Read Scratchpad command,

target address, E/S register, and scratchpad data fol-

lows the scratchpad data. As with the Write Scratchpad

command, this CRC can be compared to the value the

master has calculated to determine if the communica-

tion was successful. After the master has verified the

data, it can send the Copy Scratchpad to copy the

scratchpad to memory. Alternatively, the Load First

Secret or Compute Next Secret command can be

issued to change the secret. See the descriptions of

these commands for more information.

Refer to the full data sheet for this information.

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DS28E01G-100U Datasheet(PDF) 9 Page - Maxim Integrated Products

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