DS1977-F5# Maxim Integrated Products, DS1977-F5# Datasheet - Page 28

• Manufacturer Part Number: DS1977-F5#
• Description: IBUTTON EEPROM 32KBit F5
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1977-F5#

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 32KB
• Memory Type: EEPROM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

With only a single DS1977 connected to the bus master, the communication is as follows:
Step 1
Step 2
Step 3
Step 4
Step 5
MASTER MODE
(—)
(—)
(—)
TX
TX
TX
TX
RX
RX
RX
RX
RX
RX
RX
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
(Activate Strong Pullup for t
(Activate Strong Pullup for t
(Activate Strong Pullup for t
<Full-Access Password>
DATA (LSB FIRST)
<Read Password>
<2 Bytes CRC16>
<2 Bytes CRC16>
<10 Data Bytes>
<10 Bytes>
<64 Bytes>
<64 Bytes>
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
AAh
CCh
AAh
CCh
A0h
A0h
A0h
0Fh
00h
00h
29h
99h
00h
29h
69h
80h
00h
28 of 29
PROG
PROG
PROG
)
)
)
Reset Pulse
Presence Pulse
Issue Skip ROM Command
Issue Write Scratchpad Command
TA1, Target Address = A0h (Start Address)
TA2, Target Address = 00A0h
Write Data Bytes to Scratchpad
Reset Pulse
Presence Pulse
Issue Skip ROM Command
Issue Read Scratchpad Command
Read TA1, Target Address = A0h
Read TA2, Target Address = 00A0h
Read E/S-Byte
Read from Scratchpad and Compare to what
was Written
Reset Pulse
Presence Pulse
Issue Skip ROM Command
Issue Copy Scratchpad with Password
Command
TA1, Target Address = A0h
TA2, Target Address = 00A0h
E/S-Byte
Transmit Full-Access Password (8 Bytes)
Supply Power for Programming
Read to Check for Programming Success;
AAh Means Success
Reset Pulse
Presence Pulse
Issue Skip ROM Command
Issue Read Memory with Password
Command
TA1, Target Address = 80h
TA2, Target Address = 0080h
Transmit Read Password (8 Bytes)
Supply Power for Reading
Read Data from Page 2
Read Inverted CRC16
Supply Power for Reading
Read Data from Page 3
Read Inverted CRC16
Reset Pulse
Presence Pulse
COMMENTS
DS1977