外文翻譯---ds18b20單總線數(shù)字溫度計(jì)(文件)
【正文】 slave present on the bus, a data collision will occur when all the slaves attempt to respond at the same time. (3) MATCH ROM [55H] The match ROM mand followed by a 64bit ROM code sequence allows the bus master to address a specific DS18B20 on a multidrop or singledrop bus. Only the BS18B20 that exactly matches the 64bit ROM code sequence will respond to the function mand issued by the master, all other slaves on the bus will wait for a reset pulse. (4) SKIP ROM [0CCH] The master can use this mand to address all devices on the bus simultaneously without sending out any ROM code information. Note that the Read Scratchpad mand can follow the Skip ROM mand only if there is a single slave device on the bus. In this case time is saved by allowing the master to read from the slave without sending the device’ s 64bit ROM code. A Skip ROM mand followed by a Read Scratchpad mand will cause a data collision on the bus if there is more than one slave since multiple devices will attempt to transmit data simultaneously. (5) ALARM SEARCH [OECH] The operation of this mand is identical to the operation of the Search ROM mand except that only slaves with a set alarm flag will respond. This mand allows the master device to determine if any DS18B20s experienced an alarm condition during the most recent temperature conversion. Refer to the OPERATIONALARM SIGNAING section for an explanation of alarm flag operation. (6) CONNVERTT [44H] This mand initiates a single temperature conversion. Following the conversion, the resulting thermal data is stored in the
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