Rainbow Electronics DS2431 - Manual

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GENERAL DESCRIPTION
The DS2431 is a 1024-bit, 1-Wire
®
EEPROM chip
organized as four memory pages of 256 bits each.
Data is written to an 8-byte scratchpad, verified, and
then copied to the EEPROM memory. As a special
feature, the four memory pages can individually be
write protected or put in EPROM-emulation mode,
where bits can only be changed from a 1 to a 0 state.
The DS2431 communicates over the single-
conductor 1-Wire bus. The communication follows
the standard Dallas Semiconductor 1-Wire protocol.
Each device has its own unalterable and unique 64-
bit ROM registration number that is factory lasered
into the chip. The registration number is used to
address the device in a multidrop 1-Wire net
environment.
APPLICATIONS
Accessory/PC Board Identification
Medical Sensor Calibration Data Storage
Analog Sensor Calibration Including IEEE-
P1451.4 Smart Sensors
Ink and Toner Print Cartridge Identification
After-Market Management of Consumables
TYPICAL OPERATING CIRCUIT
µC
I/O
DS2431
GND
R
PUP
V
CC
FEATURES
!
1024 Bits of EEPROM Memory Partitioned into
Four Pages of 256 Bits
!
Individual Memory Pages can be Permanently
Write Protected or Put in EPROM-Emulation
Mode ("Write to 0")
!
Switchpoint Hysteresis and Filtering to Optimize
Performance in the Presence of Noise
!
IEC 1000-4-2 Level 4 ESD Protection (8kV
Contact, 15kV Air)
!
Reads and Writes Over a Wide Voltage Range of
2.8V to 5.25V from -40°C to +85°C
!
Communicates to Host with a Single Digital
Signal at 15.4kbps or 111kbps Using 1-Wire
Protocol
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS2431 -40°C to 85°C TO-92
DS2431/T&R -40°C to 85°C TO-92, tape & reel
DS2431P -40°C to 85°C TSOC
DS2431P/T&R -40°C to 85°C TSOC, tape & reel
DS2431X -40°C to 85°C CSP, tape & reel
PIN CONFIGURATION
1 2 3
1 2 3
TO-92
TSOC, Top View
1
2
3
6
5
4
TSOC, TO-92 pinout:
Pin 1 -------------
GND
Pin 2 ------------- I/O
All other pins -- NC
CSP, approx. 68
×
68 mil
Top view, bumps not visible
A B
2
1
A1 = NC
A2 = I/O
B1 = NC
B2 = GND
DS2431
1024-Bit 1-Wire EEPROM
www.maxim-ic.com
Commands, Registers, and Modes are capitalized for
clarity.
1-Wire is a registered trademark of Dallas Semiconductor Corp.