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DS28EC20P+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27
DS28EC20: 20Kb 1-Wire EEPROM
25 of 27
COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGEND
SYMBOL DESCRIPTION
RST
1-Wire reset pulse generated by master.
PD
1-Wire presence pulse generated by slave.
Select
Command and data to satisfy the ROM function protocol.
WS
Command "Write Scratchpad".
RS
Command "Read Scratchpad".
CPS
Command "Copy Scratchpad".
RM
Command "Read Memory".
ERM
Command "Extended Read Memory".
TA
Target address TA1, TA2.
TA-E/S
Target address TA1, TA2 with E/S byte.
<data to EOS>
Transfer of as many bytes as needed to reach the end of the scratchpad for a given
target address.
<data to EOM>
Transfer of as many data bytes as are needed to reach the end of the memory.
<data to EOP>
Transfer of as many data bytes as are needed to reach the end of the page for a given
target address.
CRC16\
Transfer of an inverted CRC16.
FF loop
Indefinite loop where the master reads FF bytes.
AA loop
Indefinite loop where the master reads AA bytes.
Programming
Data transfer to EEPROM; no activity on the 1-Wire bus permitted during this time.
COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—COLOR CODES
Master to Slave Slave to Master Programming
WRITE SCRATCHPAD (CANNOT FAIL)
RST PD Select WS TA <Data to EOS> CRC16\ FF Loop
READ SCRATCHPAD
RST PD Select RS TA-E/S <Data to EOS> CRC16\ FF Loop
COPY SCRATCHPAD (SUCCESS)
RST PD Select CPS TA-E/S Programming AA Loop
COPY SCRATCHPAD (BS = 1 OR PF = 1 OR COPY PROTECTED)
RST PD Select CPS TA-E/S FF Loop
DS28EC20: 20Kb 1-Wire EEPROM
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READ MEMORY (CANNOT FAIL)
RST PD Select RM TA <Data to EOM> FF Loop
EXTENDED READ MEMORY (CANNOT FAIL)
RST PD Select ERM TA <Data to EOP> CRC16\ <32 Bytes> CRC16\
PACKAGE INFORMATION
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages.
Note that a “+”, “#”, or “-“ in the package code indicates RoHS status only. Package drawings may show a different
suffix character, but the drawing pertains to the package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
6 TSOC
D6+1
21-0382
90-0321
3 TO-92 (bulk)
Q3+1
21-0248
—
3 TO-92 (tape and reel)
Q3+4
21-0250
—
Loop
DS28EC20: 20Kb 1-Wire EEPROM
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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
© 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
REVISION HISTORY
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 071007 Initial release —
1 091707
TSOC package added; corrected Electrical Characteristics table Note
20
1, 4
2 040109
Updated the text and graphics to mark which features are not
applicable in the low-voltage environment
1, 3, 7, 11,
17, 18, 20,
21
Created a second Electrical Characteristics table for 3.3V V
PUP
(±5%),
operating temp range 0°C to +70°C, no overdrive
4, 5
3 11/11
Removed information about the registration number being factory
lasered into the chip in the General Description section, 64-Bit ROM
section, Figure 3, and CRC Generation section
1, 7, 24
Changed 125kbps to 90kbps in the Features and Hardware
Configuration sections
1, 16
Updated the soldering information and added lead temperature
information in the Absolute Maximum Ratings section
2
Updated the 5.0V/3.0V Supply Electrical Characteristics tables
parameters for C
IO
, I
L
, t
REC
, t
SLOT
, I
PROG
, and related notes
2–5
Replaced the last sentence of the Read Memory [F0h] and Extended
Read Memory [A5h] sections to clarify the command
16
Added the Package Information table 26
4 3/12
Revised the 5.0V Supply Electrical Characteristics table Notes 1, 4,
and 15
3
Revised the 3.3V Supply Electrical Characteristics table Notes 3 and
14
5
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DS28EC20P+

Mfr. #:
Buy DS28EC20P+
Manufacturer:
Maxim Integrated
Description:
EEPROM 20Kb 1-Wire EEPROM
Lifecycle:
New from this manufacturer.
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