Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsDS2411R+T&R

1-Wire is a registered trademark of Maxim Integrated Products, Inc. 1 of 12

FEATURES

 Unique, Factory-Lasered and Tested 64-Bit

Registration Number (8-Bit Family Code

Plus 48-Bit Serial Number Plus 8-Bit CRC

Tester); Guaranteed No Two Parts Alike

 Standby Current <1μA

 Built-In Multidrop Controller Enables

Multiple DS2411s to Reside on a Common

1-Wire



Network

 Multidrop Compatible with Other 1-Wire

Products

 8-Bit Family Code Identifies Device as

DS2411 to the 1-Wire Master

 Low-Cost TSOC, SOT23-3, and Flip-Chip

Surface-Mount Packages

 Directly Connects to a Single-Port Pin of a

Microprocessor and Communicates at up to

15.4kbps

 Overdrive Mode Boosts Communication

Speed to 125kbps

 Operating Range: 1.5V to 5.25V, -40°C to

+85°C

PIN DESCRIPTION

NAME

SOT23 TSOC

FLIP

CHIP

I/O

GND

N.C.

—

3, 4, 5

PIN CONFIGURATION

SOT23-3, Top View

TSOC, Top View

Flip Chip, Top View with

Laser Mark, Contacts

Not Visible.

“rrd” = Revision/Date

-1rrd

A B

ORDERING INFORMATION

PART

TEMP

RANGE

PIN-

PACKAGE

DS2411R+T&R

-40°C to +85°C

3 SOT23-3

DS2411P+

-40°C to +85°C

6 TSOC

DS2411P+T&R

-40°C to +85°C

6 TSOC

DS2411X

-40°C to +85°C

4 Flip Chip*

+Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

*The DS2411X is RoHS qualified and comes in tape and reel.

DESCRIPTION

The DS2411 silicon serial number is a low-cost, electronic registration number with external power

supply. It provides an absolutely unique identity that can be determined with a minimal electronic

interface (typically, a single port pin of a microcontroller). The DS2411’s registration number is a

factory-lasered, 64-bit ROM that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit

family code (01h). Data is transferred serially through the Maxim 1-Wire protocol. The external power

supply is required, extending the operating voltage range of the device below typical 1-Wire devices.

DS2411

Silicon Serial Number with V

Input

19-6131; Rev 11/11

Summary of content (12 pages)

PAGE 1
9-6131; Rev 11/11 DS2411 Silicon Serial Number with VCC Input FEATURES          PIN CONFIGURATION Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code Plus 48-Bit Serial Number Plus 8-Bit CRC Tester); Guaranteed No Two Parts Alike Standby Current <1μA Built-In Multidrop Controller Enables Multiple DS2411s to Reside on a Common 1-Wire Network Multidrop Compatible with Other 1-Wire Products 8-Bit Family Code Identifies Device as DS2411 to the 1-Wire Master Low-Cost T
PAGE 2
DS2411 ABSOLUTE MAXIMUM RATINGS I/O Voltage to GND VCC Voltage to GND I/O, VCC Current Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (TSOC, SOT23-3 only; soldering, 10s) Soldering Temperature (reflow) TSOC, SOT-23-3 Flip Chip -0.5V to +6V -0.
PAGE 3
PARAMETER CONDITIONS Standard speed Timeslot Duration tSLOT Overdrive VCC ≥ 2.2V Overdrive VCC ≥ 1.5V I/O PIN, 1-Wire RESET, PRESENCE DETECT CYCLE Standard speed Reset Low Time tRSTL Overdrive speed Standard speed Presence-Detect High Time tPDH Overdrive VCC ≥ 2.2V Overdrive VCC ≥ 1.5V Standard speed Presence-Detect Low Time tPDL Overdrive VCC ≥ 2.2V Overdrive VCC ≥ 1.
PAGE 4
DS2411 Note 9: The earliest recognition of a negative edge is possible at tREH after VTH has been reached on the previous edge. Interval during the negative edge on I/O at the beginning of a presence-detect pulse between the time at which the voltage is 90% of VPUP and the time at which the voltage is 10% of VPUP. ε in Figure 7 represents the time required for the pullup circuitry to pull the voltage on I/O up VIL to VTH.
PAGE 5
DS2411 Figure 2. 1-WIRE CRC GENERATOR 8 5 4 POLYNOMIAL = X + X + X + 1 1st STAGE X 0 2nd STAGE X 1 3rd STAGE X 2 4th STAGE X 6th STAGE 5th STAGE 3 X 4 X 5 7th STAGE X 6 8th STAGE X 7 INPUT DATA Figure 3. DS2411 EQUIVALENT CIRCUIT VCC Rx I/O Tx -1µA ≤ IL ≤ 1µA 100Ω MOSFET GROUND Figure 4. BUS MASTER CIRCUIT VCC to DS2411 BUS MASTER DS5000 OR 8051 EQUIVALENT Rx OPEN-DRAIN PORT PIN RPUP I/O to DS2411 Tx Ground to DS2411 RPUP must be between 0.3 kΩ and 2.2 kΩ.
PAGE 6
DS2411 TRANSACTION SEQUENCE The communication sequence for accessing the DS2411 through the 1-Wire bus is as follows:    Initialization ROM Function Command Read Data INITIALIZATION All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a reset pulse transmitted by the bus master followed by a presence pulse(s) transmitted by the slave(s). The presence pulse lets the bus master know that the DS2411 is on the bus and is ready to operate.
PAGE 7
DS2411 Figure 5.
PAGE 8
DS2411 1-WIRE SIGNALING The DS2411 requires strict protocols to ensure data integrity. The protocol consists of four types of signaling on one line: Reset Sequence with Reset Pulse and Presence Pulse, Write 0, Write 1, and Read Data. Except for the presence pulse the bus master initiates all these signals. The DS2411 can communicate at two different speeds: standard speed and Overdrive speed. If not explicitly set into the Overdrive mode, the DS2411 will communicate at standard speed.
PAGE 9
DS2411 INITIALIZATION PROCEDURE Figure 6. Reset and Presence Pulse READ/WRITE TIMING DIAGRAM Figure 7a. Write-One Time Slot Figure 7b. Write-Zero Time Slot Figure 7c.
PAGE 10
DS2411 Slave to Master A read-data time slot begins like a write-one time slot. The voltage on the data line must remain below VTLMIN until the read low time tRL is expired. During the tRL window, when responding with a 0, the DS2411 will start pulling the data line low; its internal timing generator determines when this pull-down ends and the voltage starts rising again. When responding with a 1, the DS2411 will not hold the data line low at all, and the voltage starts rising as soon as tRL is over.
PAGE 11
DS2411 NOISE SUPPRESSION SCHEME Figure 8 tREH VPUP tREH VTH VHY Case A Case B 0V tGL Case C tGL CRC GENERATION To validate the registration number transmitted from the DS2411, the bus master can generate a CRC value from the 8-bit family code and unique 48-bit serial number as it is received. If the CRC matches the last 8 bits of the registration number, the transmission is error free. The equivalent polynomial function of this CRC is: CRC = x8 + x5 + x4 + 1.
PAGE 12
DS2411 REVISION HISTORY REVISION DATE 020703 052003 122106 11/11 DESCRIPTION Initial release Corrected the Flip Chip pin configuration. Section 1-Wire Signaling rewritten. Added section Improved Network Behavior. Added flip chip top marking and URL to package outline drawing. Added SOT23-3 and TSOC lead-free part numbers to Ordering Information. Updated ordering information, lead temperature, soldering temperature.