DS28E10R+T datasheet(8/17 Pages) MAXIM

Part #	DS28E10R+T

Description	1-Wire SHA-1 Authenticator Irreversible Write Protection

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Manufacturer	MAXIM [Maxim Integrated Products]

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1-Wire SHA-1 Authenticator

14

ABRIDGED DATA SHEET

all slaves try to transmit at the same time (open drain

produces a wired-AND result). The resultant family code

and 48-bit serial number result in a mismatch of the CRC.

Match ROM [55h]

The Match ROM command, followed by a 64-bit ROM ID,

allows the bus master to address a specific DS28E10 on

a multidrop bus. Only the DS28E10 that exactly matches

the 64-bit ROM ID responds to the following memory

or SHA-1 function command. All other slaves 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 ROM ID numbers. By taking advantage of

the wired-AND property of the bus, the master can use

a process of elimination to identify the ID of all slave

devices. For each bit of the ID number, starting with the

least significant bit, the bus master issues a triplet of

time slots. On the first slot, each slave device participat-

ing in the search outputs the true value of its ID number

bit. On the second slot, each slave device participating

in the search outputs the complemented value of its ID

number bit. On the third slot, the master writes the true

value of the bit to be selected. All slave devices that do

not match the bit written by the master stop participat-

ing in the search. If both of the read bits are zero, the

master knows that slave devices exist with both states of

the bit. By choosing which state to write, the bus master

branches in the search tree. After one complete pass,

the bus master knows the ROM ID number of a single

device. Additional passes identify the ID numbers of the

remaining devices. Refer to Application Note 187: 1-Wire

Search Algorithm for a detailed discussion, including an

example.

Skip ROM [CCh]

This command can save time in a single-drop bus sys-

tem by allowing the bus master to access the memory

or SHA-1 functions without providing the 64-bit ROM

ID. 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 occurs on the bus

as multiple slaves transmit simultaneously (open-drain

pulldowns produce a wired-AND result).

Resume Command [A5h]

To maximize the data throughput in a multidrop environ-

ment, the Resume command is available. This command

checks the status of the RC bit and, if it is set, directly

transfers control to the memory and SHA-1 functions,

similar to a Skip ROM command. The only way to set

the RC bit is through successfully executing the Match

ROM, Search ROM, or Overdrive-Match ROM command.

Once the RC bit is set, the device can repeatedly be

accessed through the Resume command. Accessing

another device on the bus clears the RC bit, preventing

two or more devices from simultaneously responding to

the Resume command.

Overdrive-Skip ROM [3Ch]

On a single-drop bus this command can save time by

allowing the bus master to access the memory functions

without providing the 64-bit ROM ID. Unlike the normal

Skip ROM command, the Overdrive-Skip ROM sets the

DS28E10 in the overdrive mode (OD = 1). All communi-

cation following this command must occur at overdrive

speed until a reset pulse of minimum 480Fs duration

resets all devices on the bus to standard speed (OD = 0).

When issued on a multidrop bus, this command sets all

overdrive-supporting devices into overdrive mode. To

subsequently address a specific overdrive-supporting

device, a reset pulse at overdrive speed must be issued

followed by a Match ROM or Search ROM command

sequence. This speeds up the time for the search pro-

cess. If more than one slave supporting overdrive is pres-

ent on the bus and the Overdrive-Skip ROM command

is followed by a read command, data collision occurs on

the bus as multiple slaves transmit simultaneously (open-

drain pulldowns produce a wired-AND result).

Overdrive-Match ROM [69h]

The Overdrive-Match ROM command followed by a

64-bit ROM ID transmitted at overdrive speed allows

the bus master to address a specific DS28E10 on a

multidrop bus and to simultaneously set it in overdrive

mode. Only the DS28E10 that exactly matches the 64-bit

number responds to the subsequent memory or SHA-1

function command. Slaves already in overdrive mode

from a previous Overdrive-Skip ROM or successful

Overdrive-Match ROM command remain in overdrive

mode. All overdrive-capable slaves return to standard

speed at the next reset pulse of minimum 480Fs dura-

tion. The Overdrive-Match ROM command can be used

with a single or multiple devices on the bus.

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