DS2411 Maxim, DS2411 Datasheet
DS2411
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DS2411 Summary of contents
Page 1
... 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) ...
Page 2
... TSOC, SOT-23-3 Flip Chip 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. ELECTRICAL CHARACTERISTICS (V ...
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... Note 1: System requirement. Note 2: Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and 1-Wire recovery times. The specified value here applies to systems with only one device and with the minimum 1-Wire recovery times. For more heavily loaded systems, an active pullup such as that found in the DS2480B may be required ...
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... BUS SYSTEM The 1-Wire bus has a single bus master and one or more slaves. In all instances, the DS2411 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) ...
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... Figure 2. 1-WIRE CRC GENERATOR 1st 2nd 3rd STAGE STAGE STAGE Figure 3. DS2411 EQUIVALENT CIRCUIT Rx Tx Figure 4. BUS MASTER CIRCUIT R PUP value depends on the 1-Wire communication speed and the bus load characteristics POLYNOMIAL = 4th 5th STAGE ...
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... 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. For more details, see the 1-Wire Signaling section. ...
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... Reset Pulse ? Y DS2411 Tx Presence Pulse F0h N Search ROM Command? Y DS2411 Tx Bit 0 DS2411 Tx Bit 0 Master Tx Bit 0 N Bit 0 Match? Y DS2411 Tx Bit 1 DS2411 Tx Bit 1 Master Tx Bit 1 N Bit 1 Match? Y DS2411 Tx Bit 63 DS2411 Tx Bit 63 Master Tx Bit 63 N Bit 63 Match 3Ch N OD Skip ...
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... Wire devices. Read/Write Time Slots Data communication with the DS2411 takes place in time slots that carry a single bit each. Write time slots transport data from bus master to slave. Read time-slots transfer data from slave to master. The definitions of the write and read time slots are illustrated in Figure 7. ...
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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. Read-data Time Slot ...
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... 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 t The sum δ ...
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... 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 received. If the CRC matches the last 8 bits of the registration number, the transmission is error free. ...
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... © 2011 Maxim Integrated Products DESCRIPTION specification; corrected the t W1L Maxim is a registered trademark of Maxim Integrated Products, Inc. DS2411 PAGES CHANGED — 10, 11 ...