DS28EA00U+T&R【PDF 19/29 页】IC THERMOMETER 1-WIRE 8-USOP

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Sheet目录40

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Skip ROM [CCh]

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

tem by allowing the bus master to access the control

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 occurs on the bus as

multiple slaves transmit simultaneously (open-drain

pulldowns produce a wired-AND result).

Overdrive-Skip ROM [3Ch]

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

allowing the bus master to access the control functions

without providing the 64-bit ROM code. Unlike the nor-

mal Skip ROM command, the Overdrive-Skip ROM sets

the DS28EA00 in the overdrive mode (OD = 1). All com-

munication following this command has to occur at

overdrive speed until a reset pulse of minimum 480祍

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 has to be

issued followed by a Match ROM or Search ROM com-

mand sequence. This speeds up the time for the

search process. If more than one slave supporting

overdrive is present 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 sequence transmitted at overdrive speed

allows the bus master to address a specific DS28EA00

on a multidrop bus and to simultaneously set it in over-

drive mode. Only the DS28EA00 that exactly matches

the 64-bit ROM sequence responds to the subsequent

control function command. Slaves already in overdrive

mode from a previous Overdrive-Skip ROM or success-

ful Overdrive-Match ROM command remain in over-

drive mode. All overdrive-capable slaves return to

standard speed at the next reset pulse of minimum

480祍 duration. The Overdrive-Match ROM command

can be used with a single device or multiple devices on

the bus.

1-Wire Digital Thermometer with

Sequence Detect and PIO

DS28EA00

Maxim Integrated

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