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DS2401-SLT-R Datasheet

Download or read online Maxim Integrated DS2401-SLT-R DS2401 Silicon Serial Number pdf datasheet.



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FEATURES
Upgrade and drop-in replacement for DS2400
— Extended 2.8 to 6.0 voltage range
— Multiple DS2401s 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
16.3kbits/s
TO-92 Tape & Reel version with leads bent
to 100mil spacing (default) or with straight
leads (DS2401T-SL)
Applications
— PCB Identification
— Network Node ID
— Equipment Registration
Operates over industrial temperature range of
-40°C to +85°C
1-Wire is a registered trademark of Dallas Semiconductor.
Silicon Serial Number
PIN ASSIGNMENT
TO-92
DALLAS
DS2401
1
2
3
1
2 3
BOTTOM VIEW
01rrd
1
2
See
56-G7009-001
for package outline.
PIN DESCRIPTION
TO-92,
SOT-223
Pin 1
Ground
Pin 2
Data (DQ)
Pin 3
No Connect
Pin 4
Ground
Pin 5-6
1 of 10
EV Kit Available
DS2401
TSOC PACKAGE
TOP VIEW
3.7mm x 4.0mm x 1.5mm
TOP VIEW
See Mech. Drawings
Section
Flip Chip, Top View
with Laser Mark,
Contacts Not Visible.
“rrd” = Revision/Date
TSOC
Flip Chip
Ground
Data (DQ)
Data (DQ)
Ground
No Connect
No Connect
No Connect
112006

Summary of Contents

Page 1

... FEATURES Upgrade and drop-in replacement for DS2400 Extended 2.8 to 6.0 voltage range Multiple DS2401s 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 ...

Page 2

... The 1-Wire bus is a system which has a single bus master system and one or more slaves. In all instances, the DS2401 is a slave device. The bus master is typically a microcontroller. The discussion of this bus system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire signaling (signal type and timing) ...

Page 3

... DS2401 MEMORY MAP Figure 1 8-Bit CRC Code MSB LSB MSB DS2401 EQUIVALENT CIRCUIT Figure 2 BUS MASTER CIRCUIT Figure 3 Note: Depending on the 1-Wire communication speed and the bus load characteristics, the optimal pullup ) value will be in the 1.5k Ω Ω range. resistor (R ...

Page 4

... 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. For more details, see the 1-Wire Signaling section. ROM FUNCTION COMMANDS Once the bus master has detected a presence, it can issue one of the four ROM function commands ...

Page 5

... DS2401. During write time slots, the delay circuit determines when the DS2401 will sample the data line. For a read data time slot 0” transmitted, the delay circuit determines how long the DS2401 will hold the data line low overriding the 1 generated by the master. ...

Page 6

ROM FUNCTIONS FLOW CHART Figure ...

Page 7

... INITIALIZATION PROCEDURE RESET AND PRESENCE PULSES Figure 5 RESISTOR MASTER DS2401 In order not to mask interrupt signaling by other devices on the 1-Wire bus less than 960 μ s. READ/WRITE TIMING DIAGRAM Figure 6 Write-One Time Slot RESISTOR MASTER 480 μ s t < RSTL 480 μ ...

Page 8

... DS2401 CRC GENERATION To validate the data transmitted from the DS2401, the bus master may generate a CRC value from the data received. This generated value is compared to the value stored in the last 8 bits of the DS2401. If the two CRC values match, the transmission is error-free. ...

Page 9

... Soldering Temperature This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. DC ELECTRICAL CHARACTERISTICS PARAMETER ...

Page 10

... The duration of the low pulse sent by the master should be a minimum of 1μs with a maximum value as short as possible to allow time for the pullup resistor to recover the line to a high level before the 1- Wire device samples in the case of a Write-One Time or before the master samples in the case of a Read-One Time ...

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