DS1990A Просмотр технического описания (PDF) - Maxim Integrated

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производитель

DS1990A

Serial Number iButton

Maxim Integrated 

Serial Number iButton

Slave-to-Master

A read-data time slot begins like a write-one time slot.

The voltage on the data line must remain below VILMAX

until the read low time tRL is expired. During the tRL

window, when responding with a 0, the DS1990A starts

pulling the data line low; its internal timing generator

determines when this pulldown ends and the voltage

starts rising again. When responding with a 1, the

DS1990A does not hold the data line low at all, and the

voltage starts rising as soon as tRL is over.

The sum of tRL + δ (rise time) on one side and the inter-

nal timing generator of the DS1990A on the other side

define the master sampling window (tMSRMIN to

tMSRMAX) in which the master must perform a read from

the data line. For most reliable communication, tRL

should be as short as permissible and the master should

read close to but no later than tMSRMAX. After reading

from the data line, the master must wait until tSLOT is

expired. This guarantees sufficient recovery time tREC

for the DS1990A to get ready for the next time slot.

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.

PACKAGE TYPE

F3 iButton

F5 iButton

PACKAGE CODE

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DOCUMENT NO.

56-G0CAN-F30

56-G0CAN-F50

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