DS2413 Maxim, DS2413 Datasheet
DS2413
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DS2413 Summary of contents
Page 1
... IO and PIO pins are all capable of withstanding continuous application of voltages up to 28V max. Communication and operation of the DS2413 is performed with the single contact Maxim/Dallas 1-Wire serial interface. APPLICATIONS LED Control ...
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... Lead Temperature (soldering, 10s) Soldering Temperature (reflow) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied ...
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... For more heavily loaded systems, an active pullup such as that found in the DS2482-x00 or DS2480B may be required. The DS2482-x00 may not always detect the DS2413 presence pulse. For proper operation it may be necessary to disregard (force to 1) the PPD bit in the DS2482-x00 status register. ...
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... DESCRIPTION The DS2413 combines two PIO pins and a fully featured 1-Wire interface in a single chip. PIO outputs are open- drain, operate 28V and provide an on resistance of 20 max. A robust communication protocol ensures that PIO output changes occur error-free. Each DS2413 has a Registration Number that is 64 bits long. The ...
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... LASERED ROM Each DS2413 has a unique ROM Registration Number that is 64 bits long, as shown in Figure 3. The first eight bits are a 1-Wire family code. The next 48 bits are a unique serial number. The last eight bits are a CRC (Cyclic Redundancy Check) of the first 56 bits. The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates as shown in Figure 4 ...
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... Examples on how to use these functions are included at the end of this document. The communication between master and DS2413 takes place either at standard speed (default Overdrive Speed (OD = 1). If not explicitly set into the Overdrive Mode, the DS2413 powers up in standard speed. ...
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... PIO Output Data Byte Bus Master TX inverted new PIO Output Data Byte Transmission 1) DS2413 Updates PIO Output Latch Bus Master RX Confirmation AAh DS2413 Samples PIO Pin Status Bus Master RX PIO Pin Status Reset ROM Functions Flow Chart (Figure 10) ...
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... PIO 1-Wire BUS SYSTEM The 1-Wire bus is a system that has a single bus master and one or more slaves. In all instances the DS2413 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 types and timing). The 1-Wire protocol defines bus transactions in terms of the bus state during specific time slots, which are initiated on the falling edge of sync pulses from the bus master ...
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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 presence pulse(s) transmitted by the slave(s). The presence pulse lets the bus master know that the DS2413 is on the bus and is ready to operate. For more details, see the 1- Wire Signaling section. ...
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... ID numbers of the remaining devices. Refer to Application Note 187: 1-Wire Search Algorithm for a detailed discussion, including an example. Since with the DS2413 the ROM CRC is not valid if one or more address inputs are tied to GND recommended double search when building a list of devices on the 1-Wire line. ...
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... Search ROM Command ? Command ? DS2413 TX Bit 0 Master TX Bit 0 DS2413 TX Bit 0 Master TX Bit Bit 0 Bit 0 Match ? Match ? Y DS2413 TX Bit 1 Master TX Bit 1 DS2413 TX Bit 1 Master TX Bit Bit 1 Bit 1 Match ? Match ? Y DS2413 TX Bit 63 Master TX Bit 63 DS2413 TX Bit 63 Master TX Bit ...
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Figure 10-2. ROM Functions Flow Chart (continued Figure 10, 1 Part From Figure Part Command ? From Figure Part To Figure Part A5h 3Ch N Resume Overdrive Skip ROM ...
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... Figure 11 shows the initialization sequence required to begin any communication with the DS2413. A Reset Pulse followed by a Presence Pulse indicates the DS2413 is ready to receive data, given the correct ROM and PIO Function command. If the bus master uses slew-rate control on the falling edge, it must pull down the line for compensate for the edge ...
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... Read/Write Time Slots Data communication with the DS2413 takes place in time slots, which carry a single bit each. Write-time slots transport data from bus master to slave. Read-time slots transfer data from slave to master. Figure 12 illustrates the definitions of the write- and read-time slots. ...
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... RL line low; its internal timing generator determines when this pulldown ends and the voltage starts rising again. When responding with a 1, the DS2413 does not hold the data line low at all, and the voltage starts rising as soon as t over. + (rise time) on one side and the internal timing generator of the DS2413 on the other side define ...
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Figure 13. Noise Suppression Scheme V PUP Case A 0V COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGEND SYMBOL RST 1-Wire Reset Pulse generated by master. PD 1-Wire Presence Pulse generated by slave. Select Command and data to satisfy the ...
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... PIO ACCESS WRITE EXAMPLE Set both PIOs to 0 and then set PIOA to 1. Both PIOs are pulled high to V With only a single DS2413 connected to the bus master, the communication looks like this: MASTER MODE ...
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... LF update, delete standard versions (with lead) from ordering info. Added Package Information Table. Added “TDFN Packages Available” within the Features section. Added new TDFN part number “DS2413Q+T&R,” and information to the 11/08 Ordering Information table. Removed the note to “Contact factory for availability of the TDFN package” ...