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PDF DS2431 Data sheet ( Hoja de datos )
| Número de pieza | DS2431 | |
| Descripción | 1-Wire EEPROM | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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DS2431
1024-Bit, 1-Wire EEPROM
General Description
The DS2431 is a 1024-bit, 1-Wire® EEPROM chip orga-
nized 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 communi-
cates over the single-conductor 1-Wire bus. The com-
munication follows the standard 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/PCB 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
VCC
µC
RPUP
IO
DS2431
GND
Pin Configurations appear at end of data sheet.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
Benefits and Features
●● Easily Add Traceability and Relevant Information to
Any Individual System
• 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
●● Minimalist 1-Wire Interface Lowers Cost and
Interface Complexity
• IEC 1000-4-2 Level 4 ESD Protection
(±8kV Contact, ±15kV Air, typ)
• Reads and Writes Over a Wide Voltage Range
from 2.8V to 5.25V from -40°C to +85°C
• Communicates to Host with a Single Digital Signal
at 15.4kbps or 125kbps
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
DS2431+
-40°C to +85°C 3 TO-92
DS2431+T&R
-40°C to +85°C 3 TO-92
DS2431P+
-40°C to +85°C 6 TSOC
DS2431P+T&R -40°C to +85°C 6 TSOC
DS2431G+U
-40°C to +85°C 2 SFN (6mm x 6mm)
DS2431G+T&R
-40°C to +85°C
2 SFN (6mm x 6mm)
(2.5k pcs)
DS2431GA+U
-40°C to +85°C 2 SFN (3.5mm x 6.5mm)
DS2431GA+T&R
-40°C to +85°C
2 SFN (3.5mm x 6.5mm)
(2.5k pcs)
DS2431Q+T&R -40°C to +85°C 6 TDFN-EP* (2.5k pcs)
DS2431X-S+
-40°C to +85°C 3x3 UCSPR (2.5k pcs)
DS2431X+
-40°C to +85°C 3x3 UCSPR (10k pcs)
Note: The leads of TO-92 packages on tape and reel are
formed to approximately 100-mil (2.54mm) spacing. For details,
refer to the package outline drawing.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
19-4675; Rev 15; 3/15
1 page  
DS2431
1024-Bit, 1-Wire EEPROM
Pin Description
TSOC
3, 4, 5, 6
2
1
TO-92
3
2
1
PIN
TDFN-EP
1, 4, 5, 6
2
3
———
SFN
—
1
2
—
UCSPR
A2, A3, C2,
C3
C1
A1
—
NAME
FUNCTION
N.C.
IO
GND
EP
Not Connected
1-Wire Bus Interface. Open-drain signal
that requires an external pullup resistor.
Ground Reference
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.
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.
IO
1-Wire
FUNCTION CONTROL
MEMORY
FUNCTION
CONTROL UNIT
CRC-16
GENERATOR
DATA MEMORY
4 PAGES OF
256 BITS EACH
REGISTER PAGE
64 BITS
Figure 1. Block Diagram
PARASITE POWER
64-BIT
LASERED ROM
DS2431
64-BIT
SCRATCHPAD
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
DS2431
1024-Bit, 1-Wire EEPROM
FROM FIGURE 7a
55h
COPY SCRATCHPAD?
N
Y
BUS MASTER Tx
TA1 (T[7:0]), TA2 (T[15:8])
AND E/S BYTE
APPLICABLE TO ALL R/W
MEMORY LOCATIONS.
F0h
READ MEMORY?
N
Y
BUS MASTER Tx
TA1 (T[7:0]), TA2 (T[15:8])
AUTH. CODE
MATCH?
N
BUS MASTER
Rx "1"s
Y
T[15:0] < 0090h?
Y
ADDRESS < 90h?
Y
N DS2431 SETS MEMORY
N ADDRESS = (T[15:0])
N
PF = 0?
Y
Y
COPY PROTECTED?
N
DS2431
INCREMENTS
ADDRESS
COUNTER
BUS MASTER Rx
DATA BYTE FROM
MEMORY ADDRESS
MASTER Tx RESET?
Y
BUS MASTER
Rx "1"s
AA = 1
N
DURATION: tPROG
DS2431 COPIES
SCRATCHPAD
DATA TO ADDRESS
*
Y ADDRESS < 8Fh?
N
N
MASTER Tx RESET?
Y
DS2431 Tx "0"
BUS MASTER
Rx "1"s
N
MASTER Tx RESET?
MASTER Tx RESET?
N
Y MASTER Tx RESET?
Y
YN
DS2431 Tx "1"
TO FIGURE 7a
MASTER Tx RESET?
N
Y
* 1-Wire IDLE HIGH FOR POWER.
Figure 7b. Memory Function Flowchart (continued)
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet DS2431.PDF ] | |
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