DS2417

INITIALIZATION

All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence con-

sists 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 DS2417 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 that

the DS2417 supports. All ROM function commands are eight bits long. A list of these commands

follows (refer to flowchart in Figure 7):

Read ROM [33h]

This command allows the bus master to read the DS2417’s 8-bit family code, unique 48-bit serial num-

ber, and 8-bit CRC. This command should only be used if there is a single slave 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 resultant family code and 48-bit serial number read

by the master will be invalid.

Match ROM [55h]

The match ROM command, followed by a 64-bit ROM sequence, allows the bus master to address a spe-

cific DS2417 on a multidrop bus. Only the DS2417 that exactly matches the 64-bit ROM sequence will

respond to the following clock function command. All slaves that do not match the 64-bit ROM

sequence will wait for a reset pulse. This command can be used with a single or multiple devices on the

bus.

SEARCH ROM [F0h]

When a system is initially brought up, the bus master might not know the number of devices on the 1-

Wire bus or their 64-bit ROM codes. The search ROM command allows the bus master to use a process

of elimination to identify the 64-bit ROM codes of all slave devices on the bus. The search ROM process

is the repetition of a simple 3-step routine: read a bit, read the complement of the bit, then write the de-

sired value of that bit. The bus master performs this three-step routine on each bit of the ROM. After one

complete pass, the bus master knows the 64-bit ROM code of one device. Additional passes will identify

the ROM codes of the remaining devices. See Application Note 187 for a comprehensive discussion of a

search ROM, including an actual example.

Skip ROM [CCh]

This command can save time in a single drop bus system by allowing the bus master to access the clock

functions without providing the 64-bit ROM code. If more than one slave is present on the bus and, for

example, a read command is issued following the Skip ROM command, data collision will occur on the

bus as multiple slaves transmit simultaneously (open-drain pulldowns will produce a wired-AND result).

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