Datasheet

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1 of 11

FEATURES

 Upgrade and Drop-In Replacement for

DS2400

Extended 2.8V to 6.0V Range

Multiple DS2401 Devices Can Reside on a

Common 1-Wire



Net

 Unique, Factory-Lasered and Tested 64-Bit

Registration Number (8-Bit Family Code +

48-Bit Serial Number + 8-Bit CRC Tester);

Guaranteed No Two Parts Alike

 Built-In Multidrop Controller Ensures

Compatibility with Other 1-Wire Net

Products

 8-Bit Family Code Specifies DS2401

Communications Requirements to Reader

 Presence Pulse Acknowledges When the

Reader First Applies Voltage

 Low-Cost TO-92, SOT-223, and TSOC

Surface-Mount Packages

 Reduces Control, Address, Data, and Power

to a Single Pin

 Zero Standby Power Required

 Directly Connects to a Single Port Pin of a

Microprocessor and Communicates at Up to

16.3kbps

 TO-92 Tape-and-Reel Version with Leads

Bent to 100-mil Spacing (Default) or with

Straight Leads (DS2401-SL)

 -40°C to +85°C Industrial Temperature

Range

APPLICATIONS

PCB Identification

Network Node ID

Equipment Registration

PIN CONFIGURATIONS

1 2

01rrd

Flip Chip, Top View

with Laser Mark,

Contacts Not Visible.

“rrd” = Revision/Date

PIN DESCRIPTIONS

TO-92,

SOT-223

TSOC

FLIP

CHIP

Ground

Data (DQ)

Ground

No Connect

—

Ground*

No Connect

—

5, 6

—

No Connect

—

*SOT-223 only.

DS2401

Silicon Serial Number

TOP VIEW

BOTTOM VIEW

TO-92

DS2401

1 2 3

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

19-5860; Rev 5/11

TSOC

Summary of content (11 pages)

PAGE 1
9-5860; Rev 5/11 DS2401 Silicon Serial Number FEATURES            PIN CONFIGURATIONS Upgrade and Drop-In Replacement for DS2400 Extended 2.8V to 6.
PAGE 2
DS2401 ORDERING INFORMATION PART DS2401+ DS2401+T&R DS2401-SL+T&R DS2401P+ DS2401P+T&R DS2401Z+ DS2401Z+T&R DS2401X1-S#T TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C +Denotes a lead(Pb)-free/RoHS-compliant package. T&R/T = Tape and reel. SL = Straight leads. #Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.
PAGE 3
DS2401 The idle state for the 1-Wire bus is high. If, for any reason, a transaction needs to be suspended, the bus MUST be left in the idle state if the transaction is to resume. If this does not occur and the bus is left low for more than 120µs, one or more of the devices on the bus may be reset.
PAGE 4
DS2401 TRANSACTION SEQUENCE The sequence for accessing the DS2401 via the 1-Wire port 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 DS2401 is on the bus and is ready to operate.
PAGE 5
DS2401 1-Wire SIGNALING The DS2401 requires a strict protocol 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. All these signals except Presence Pulse are initiated by the bus master. The initialization sequence required to begin any communication with the DS2401 is shown in Figure 5.
PAGE 6
DS2401 ROM FUNCTIONS FLOW CHART Figure 4 6 of 11
PAGE 7
DS2401 INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 5 RESISTOR MASTER DS2401 ∗ 480µs ≤ tRSTL < ∞ * 480µs ≤ tRSTH < ∞ (includes recovery time) 15µs ≤ tPDH < 60µs 60µs ≤ tPDL < 240µs In order not to mask interrupt signaling by other devices on the 1-Wire bus, tRSTL + tR should always be less than 960µs.
PAGE 8
DS2401 READ/WRITE TIMING DIAGRAM (cont’d) Figure 6 Write-zero Time Slot 60µs ≤ tLOW0 < tSLOT < 120µs 1µs ≤ tREC < ∞ Read-data Time Slot RESISTOR MASTER DS2401 60µs ≤ tSLOT < 120µs 1µs ≤ tLOWR < 15µs 0 ≤ tRELEASE < 45µs 1µs ≤ tREC < ∞ tRDV = 15µs tSU < 1µs CRC GENERATION To validate the data transmitted from the DS2401, the bus master may generate a C RC value from the data as it is received. This generated value is compared to the value stored in the last 8 bi ts of the DS2401.
PAGE 9
DS2401 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Lead Temperature (TO-92, TSOC, SOT-223 only; soldering, 10s) Soldering Temperature (reflow) TO-92 TSOC, SOT-223 Flip Chip -0.5V to +7.
PAGE 10
DS2401 NOTES: 1) 2) 3) 4) 5) All voltages are referenced to ground. VPUP = external pullup voltage. Input load is to ground. An additional reset or communication sequence cannot begin until the reset high time has expired. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is guaranteed to be valid within 1µs of this falling edge and will remain valid for 14µs minimum (15µs total from falling edge on 1-Wire bus).
PAGE 11
DS2401 REVISION HISTORY REVISION DATE 040601 022202 122106 5/11 DESCRIPTION Changed MicroLAN to 1-Wire Net; updated ordering information for tape and reel Changed soldering temperature from 260°C for 10 seconds to See J-STD020A Specification Below Figure 3, added a note on the optimal RPUP range; added a similar note before the Read/Write Time Slots section Added notes 11 to 13 to the EC table Added flip chip package; added lead-free ordering information References to the Book of iButton Standards repl