Datasheet
Detailed Description
The DS2431 combines 1024 bits of EEPROM, an 8-byte
register/control page with up to 7 user read/write bytes,
and a fully featured 1-Wire interface in a single chip. Each
DS2431 has its own 64-bit ROM registration number that
is factory lasered into the chip to provide a guaranteed
unique identity for absolute traceability. Data is transferred
serially through the 1-Wire protocol, which requires only a
single data lead and a ground return. The DS2431 has an
additional memory area called the scratchpad that acts as
a buffer when writing to the main memory or the register
page. Data is first written to the scratchpad from which it
can be read back. After the data has been verified, a Copy
Scratchpad command transfers the data to its final memory
location. The DS2431 applications include accessory/PCB
identification, medical sensor calibration data storage,
analog sensor calibration including IEEE P1451.4 smart
sensors, ink and toner print cartridge identification, and
after-market management of consumables.
Overview
The block diagram in Figure 1 shows the relationships
between the major control and memory sections of the
DS2431. The DS2431 has four main data components:
64-bit lasered ROM, 64-bit scratchpad, four 32-byte
pages of EEPROM, and a 64-bit register page.
Figure 1. Block Diagram
PIN
NAME FUNCTION
TSOC TO-92 TDFN-EP SFN UCSPR
3, 4, 5, 6 3 1, 4, 5, 6 —
A2, A3, C2,
C3
N.C. Not Connected
2 2 2 1 C1 IO
1-Wire Bus Interface. Open-drain signal
that requires an external pullup resistor.
1 1 3 2 A1 GND Ground Reference
— — — — — EP
Exposed Pad (TDFN only). Solder
evenly to the board’s ground plane for
proper operation. Refer to Application
Note 3273: Exposed Pads: A Brief
Introduction for additional information.
MEMORY
FUNCTION
CONTROL UNIT
DATA MEMORY
4 PAGES OF
256 BITS EACH
CRC-16
GENERATOR
64-BIT
SCRATCHPAD
1-Wire
FUNCTION CONTROL
64-BIT
LASERED ROM
PARASITE POWER
IO
REGISTER PAGE
64 BITS
DS2431
DS2431 1024-Bit, 1-Wire EEPROM
www.maximintegrated.com
Maxim Integrated
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5
Pin Description