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PDF DS2431 Data sheet ( Hoja de datos )
| Número de pieza | DS2431 | |
| Descripción | 1024-Bit 1-Wire EEPROM | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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www.maxim-ic.com
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
VCC
RPUP
µC
I/O
DS2431
GND
Commands, Registers, and Modes are capitalized for
clarity.
1-Wire is a registered trademark of Dallas Semiconductor Corp.
DS2431
1024-Bit 1-Wire EEPROM
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
TO-92
1
2
3
6
5
4
TSOC, Top View
TSOC, TO-92 pinout:
Pin 1 ------------- GND
Pin 2 ------------- I/O
All other pins -- NC
123
123
2
1
A
A1 = NC
A2 = I/O
B1 = NC
B B2 = GND
CSP, approx. 68 × 68 mil
Top view, bumps not visible
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
1 of 23
REV: 050704
1 page  
Figure 2. Hierarchical Structure for 1-Wire Protocol
DS2431: 1024-Bit, 1-Wire EEPROM
DS2431 Command Level:
1-Wire ROM Function
Commands (see Figure 9)
Available
Commands:
Read ROM
Match ROM
Search ROM
Skip ROM
Resume
Overdrive Skip
Overdrive Match
Data Field
Affected:
64-bit Reg. #, RC-Flag
64-bit Reg. #, RC-Flag
64-bit Reg. #, RC-Flag
RC-Flag
RC-Flag
64-bit Reg. #, RC-Flag, OD-Flag
64-bit Reg. #, RC-Flag, OD-Flag
DS2431-specific
Memory Function
Commands (see Figure 7)
Write Scratchpad
Read Scratchpad
Copy Scratchpad
Read Memory
64-bit Scratchpad, Flags
64-bit Scratchpad
Data Memory, Register Page
Data Memory, Register Page
64-BIT LASERED ROM
Each DS2431 contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code. The next
48 bits are a unique serial number. The last 8 bits are a CRC (Cyclic Redundancy Check) of the first 56 bits. See
Figure 3 for details. The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and
XOR gates as shown in Figure 4. The polynomial is X8 + X5 + X4 + 1. Additional information about the Dallas 1-Wire
CRC is available in Application Note 27.
The shift register bits are initialized to 0. Then starting with the least significant bit of the family code, one bit at a
time is shifted in. After the 8th bit of the family code has been entered, then the serial number is entered. After the
last bit of the serial number has been entered, the shift register contains the CRC value. Shifting in the 8 bits of the
CRC returns the shift register to all 0s.
Figure 3. 64-Bit Lasered ROM
MSB
8-Bit
CRC Code
MSB
LSB
MSB
Figure 4. 1-Wire CRC Generator
48-Bit Serial Number
Polynomial = X8 + X5 + X4 + 1
LSB
8-Bit Family
Code (2Dh)
LSB MSB
LSB
1st 2nd 3rd 4th
STAGE STAGE STAGE STAGE
X0 X1 X2 X3
5th
STAGE
X4
5 of 23
6th 7th 8th
STAGE STAGE STAGE
X5 X6
X7
INPUT DATA
X8
5 Page 
Figure 7-3. Memory Function Flow Chart (continued)
DS2431: 1024-Bit, 1-Wire EEPROM
From Figure 7
2nd Part
55h
Copy Scratch-
Pad ?
N
Y
Bus Master TX
TA1 (T7:T0), TA2 (T15:T8)
and E/S Byte
Applicable to all R/W
memory locations.
To Figure 7
4th Part
Auth. Code
Match ?
N
Y
T15:T0
< 0090h ?
Y
N
N
PF = 0 ?
Y
Y Copy-
Protected ?
N
AA = 1
DS2431 copies Scratch- *
pad Data to Address
DS2431 TX “0”
Bus Master
RX “1”s
Master
TX Reset ?
N
Y
To Figure 7
2nd Part
* 1-Wire idle high for power
Y Master
TX Reset ?
N
DS2431 TX “1”
Master
TX Reset ?
N
Y
From Figure 7
4th Part
11 of 23
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet DS2431.PDF ] | |
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