DS2401 PDF

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 DS is on the bus and is ready to operate. For more details, see the 1-Wire Signaling section. All ROM function commands are 8 bits long. A list of these commands follows refer to flowchart in Figure 4. This command can only be used if there is a single DS on the bus.

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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 DS is on the bus and is ready to operate. For more details, see the 1-Wire Signaling section.

All ROM function commands are 8 bits long. A list of these commands follows refer to flowchart in Figure 4. This command can only be used if there is a single DS on the bus. If more than one slave is present on the bus, a data collision will occur when all slaves try to transmit at the same time open drain will produce a wired-AND result.

The search ROM command allows the bus master to use a process of elimination to identify the bit ROM codes of all slave devices on the bus. The ROM search process is the repetition of a simple 3-step routine: read a bit, read the complement of the bit, then write the desired value of that bit. The bus master performs this simple 3-step routine on each bit of the ROM. After one complete pass, the bus master knows the contents of the ROM in one device.

The remaining number of devices and their ROM codes may be identified by additional passes. 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 DS is shown in Figure 5. The bus master then releases the line and goes into receive mode RX.

The 1-Wire bus requires a pullup resistor range of 1. All time slots are initiated by the master driving the data line low. The falling edge of the data line synchronizes the DS to the master by triggering a delay circuit in the DS During write time slots, the delay circuit determines when the DS will sample the data line.

If the data bit is a 1, the DS will leave the read data time slot unchanged.

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