DS2431+ Maxim Integrated Products, DS2431+ Datasheet - Page 22
DS2431+
Manufacturer Part Number
DS2431+
Description
IC EEPROM 1KBIT TO92-3
Manufacturer
Maxim Integrated Products
Datasheet
1.DS2431X-S.pdf
(26 pages)
Specifications of DS2431+
Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Memory Size
1K (256 x 4)
Interface
1-Wire Serial
Operating Temperature
-40°C ~ 85°C
Package / Case
TO-92-3 (Standard Body), TO-226
Organization
1 K x 1
Interface Type
1-Wire
Supply Voltage (max)
5.25 V
Supply Voltage (min)
2.8 V
Maximum Operating Current
0.8 mA
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Speed
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
1024-Bit, 1-Wire EEPROM
Write to the first 8 bytes of memory page 1. Read the
entire memory.
22
MASTER MODE
______________________________________________________________________________________
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
Tx
Tx
Memory Function Example
DATA (LSB FIRST)
<2 Bytes CRC-16>
<2 Bytes CRC-16>
<1-Wire Idle High>
<144 Data Bytes>
<8 Data Bytes>
<8 Data Bytes>
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
AAh
CCh
AAh
CCh
0Fh
20h
00h
20h
00h
07h
55h
20h
00h
07h
F0h
00h
00h
With only a single DS2431 connected to the bus mas-
ter, the communication looks like this:
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Write Scratchpad” command
TA1, beginning offset = 20h
TA2, address = 0020h
Write 8 bytes of data to scratchpad
Read CRC to check for data integrity
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Read Scratchpad” command
Read TA1, beginning offset = 20h
Read TA2, address = 0020h
Read E/S, ending offset = 111b, AA, PF = 0
Read scratchpad data and verify
Read CRC to check for data integrity
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Copy Scratchpad” command
TA1
TA2
E/S
Wait t
Read copy status, AAh = success
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Read Memory” command
TA1, beginning offset = 00h
TA2, address = 0000h
Read the entire memory
Reset pulse
Presence pulse
PROGMAX
(AUTHORIZATION CODE)
for the copy function to complete
COMMENTS