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DS24B33S+T Datasheet

Download or read online Maxim Integrated DS24B33S+T 4Kb 1-Wire EEPROM with 200k Write/Erase Cycles pdf datasheet.



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19-5759; Rev 1; 5/11
General Description
The DS24B33 is a 4096-bit, 1-Wire
nized as 16 memory pages of 256 bits each. Data is
written to a 32-byte scratchpad, verified, and then
copied to the EEPROM memory. The DS24B33 commu-
nicates over a single-conductor 1-Wire bus. The com-
munication follows the standard 1-Wire protocol. Each
device has its own unalterable and unique 64-bit regis-
tration number that is factory programmed into the chip.
The registration number is used to address the device
in a multidrop 1-Wire net environment. The DS24B33 is
software compatible to the DS2433.
Storage of Calibration Constants
Board Identification
Storage of Product Revision Status
Typical Operating Circuit
V
CC
R
PUP
μC
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1-Wire 4Kb EEPROM
®
EEPROM orga-
♦ 4096 Bits of Nonvolatile EEPROM Partitioned Into
Sixteen 256-Bit Pages
♦ Read and Write Access is Highly Backward-
Compatible to the DS2433
♦ 256-Bit Scratchpad with Strict Read/Write
Protocols Ensures Integrity of Data Transfer
♦ Unique, Factory-Programmed, 64-Bit Registration
Number Ensures Error-Free Device Selection and
Absolute Part Identity
♦ Switchpoint Hysteresis to Optimize Performance
Applications
in the Presence of Noise
♦ Communicates to Host at 15.4kbps or 125kbps
Using 1-Wire Protocol
♦ Low-Cost Through-Hole and SMD Packages
♦ Operating Range: +2.8V to +5.25V, -40°C to +85°C
♦ IEC 1000-4-2 Level 4 ESD Protection (±8kV
Contact, ±15kV Air, Typical) for IO Pin
PART
IO
DS24B33+
DS24B33
DS24B33+T&R
DS24B33S+
DS24B33S+T&R
GND
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
TO-92
-40°C to +85°C
TO-92
-40°C to +85°C
8 SO (208 mils)
-40°C to +85°C
8 SO (208 mils)
1

Summary of Contents

Page 1

... Operating Range: 2.8V to 5.25V, -40°C to 85°C IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, Typical) for IO Pin PART IO DS24B33 DS24B33 DS24B33T&R DS24B33S DS24B33ST&R GND Denotes a lead(Pb)-free/RoHS-compliant package. T&R Tape and reel. Features Ordering Information TEMP RANGE PIN-PACKAGE -40°C to 85°C TO-92 -40° ...

Page 2

EEPROM ABSOLUTE MAXIMUM RATINGS IO Voltage Range to GND ...-0.5V to 6V IO Sink Current...20mA Operating Temperature Range ...-40°C to 85°C Junction Temperature ...150°C Storage Temperature Range ...-55°C to 125°C Stresses beyond those listed under Absolute Maximum Ratings ...

Page 3

ELECTRICAL CHARACTERISTICS (continued -40°C to 85°C.) (Note 1) A PARAMETER SYMBOL IO PIN: 1-Wire WRITE Write-Zero Low Time (Notes 2, 16) Write-One Low Time (Notes 2, 16) IO PIN: 1-Wire READ Read Low Time (Notes 2, 17) Read ...

Page 4

EEPROM ELECTRICAL CHARACTERISTICS (continued -40°C to 85°C.) (Note 1) A Note 20: Write-cycle endurance is degraded as T Note 21: Not 100% production tested; guaranteed by reliability monitor sampling. Note 22: Data retention is degraded as ...

Page 5

TO-92 SO NAME 1 4 GND 58 N.C. Detailed Description The DS24B33 combines 4Kb of data EEPROM with a fully featured 1-Wire interface in a single chip. The memory is organized as 16 pages ...

Page 6

... CRC CODE MSB LSB MSB Figure 3. 64-Bit Registration Number iButton is a registered trademark of Maxim Integrated Products, Inc. 6 ___ Figure 1 shows the parasite power supply. This circuitry steals power whenever the IO input is high. IO pro- vides sufficient power as long as the specified timing and voltage requirements are met ...

Page 7

The shift register bits are initialized to 0. Then, starting with the LSB of the family code, one bit at a time is shifted in. After the 8th bit of the family code has been entered, the serial number is ...

Page 8

EEPROM Memory Access Address Registers and Transfer Status The DS24B33 employs three address registers: TA1, TA2, and E/S (Figure 6). Registers TA1 and TA2 must be loaded with the target address to which the data is written or ...

Page 9

Memory Function Commands The Memory Function Flowchart (Figure 7) describes the protocols necessary for accessing the memory of the DS24B33. The target address registers TA1 and TA2 are used for both read and write. The communica- tion between the master ...

Page 10

EEPROM BUS MASTER Tx MEMORY FUNCTION COMMAND 0Fh WRITE SCRATCHPAD? Y DS24B33 CLEARS PF, AA BUS MASTER Tx EEPROM ARRAY TARGET ADDRESS TA1 (T[7:0]), TA2 (T[15:8]) DS24B33 SETS SCRATCHPAD OFFSET (T[4:0]) MASTER Tx DATA BYTE TO SCRATCHPAD ...

Page 11

FROM FIGURE 7a 55h N COPY SCRATCHPAD? Y BUS MASTER Rx TA1 (T[7:0]), TA2 (T[15:8]), AND E/S BYTE Y AUTHORIZATION CODE MATCH? N BUS MASTER Rx "1"s N MASTER Tx RESET FIGURE 7a 1-Wire IDLE HIGH FOR t ...

Page 12

EEPROM Read Memory [F0h] The Read Memory command is the general function to read from the DS24B33. After issuing the command, the master must provide a 2-byte target address, which should be in the range of 0000h to ...

Page 13

A multidrop bus consists of a 1-Wire bus with multiple slaves attached. The DS24B33 supports both a stan- dard and overdrive communication speed of 15.4kbps (maximum) and 125kbps (maximum), respectively, over the full pullup voltage range. For pullup voltages of ...

Page 14

EEPROM This command can save time in a single-drop bus sys- tem by allowing the bus master to access the memory functions without providing the 64-bit ROM code. If more than one slave is present on the bus ...

Page 15

FROM MEMORY FUNCTIONS FLOWCHART (FIGURE 7) BUS MASTER Tx ROM FUNCTION COMMAND 33h READ ROM COMMAND DS24B33Tx FAMILY CODE (1 BYTE) DS24B33 Tx SERIAL NUMBER (6 BYTES) DS24B33 Tx CRC BYTE Figure 9a. ROM Functions Flowchart ...

Page 16

EEPROM TO FIGURE 9a FROM FIGURE 9a FROM FIGURE 9a TO FIGURE 9a NOTE: THE OD FLAG REMAINS THE DEVICE WAS ALREADY AT OVERDRIVE SPEED BEFORE THE OVERDRIVE-MATCH ROM COMMAND WAS ISSUED. Figure 9b. ROM ...

Page 17

Signaling The DS24B33 requires strict protocols to ensure data integrity. The protocol consists of four types of signaling on one line: reset sequence with reset pulse and pres- ence pulse, write-zero, write-one, and read-data. Except for the presence pulse, ...

Page 18

EEPROM voltage on the data line should not exceed V ing the entire window. After the V W0L W1L WRITE-ONE TIME SLOT t W1L V PUP V IHMASTER ILMAX 0V ...

Page 19

A read-data time slot begins like a write-one time slot. The voltage on the data line must remain below V until the read low time t is expired. During the t RL dow, when responding with a 0, the DS24B33 ...

Page 20

EEPROM 1ST 2ND STAGE STAGE 9TH 10TH 11TH STAGE STAGE STAGE Figure 13. CRC-16 Hardware Description and Polynomial Command-Specific 1-Wire Communication ProtocolLegend SYMBOL RST 1-Wire reset pulse generated ...

Page 21

Command-Specific 1-Wire Communication ProtocolColor Codes Write Scratchpad, Reaching the End of the Scratchpad RST PD Select WS TA Read Scratchpad RST PD Select RS TA-E/S Copy Scratchpad (Success) RST PD Select CPS TA-E/S Copy ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ___Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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