Rainbow-electronics MAX1989 Manual de usuario Pagina 1

________________General DescriptionThe MAX1668/MAX1805/MAX1989 are precise multi-channel digital thermometers that report the tempera-ture of all remo

sion cycle is truncated, and the data from that conversionis not latched into either temperature-reading register. Theprevious data is not changed and

Diode Fault AlarmThere is a continuity fault detector at DXP_ that detectswhether the remote diode has an open-circuit condi-tion. At the beginning of

level sensitive). Successful reading of the alertresponse address clears the interrupt latch. Command Byte FunctionsThe 8-bit command byte register (

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors ________________________________________________________________________________

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors14 ______________________________________________________________________________

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors ________________________________________________________________________________

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors2 _______________________________________________________________________________

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors ________________________________________________________________________________

08416122024MAX1668/1805 toc03FREQUENCY (MHz)TEMPERATURE ERROR (°C)TEMPERATURE ERRORvs. SUPPLY NOISE FREQUENCY100mVP-P0.1 1 10 100WITH VCC 0.1µF CAPACI

020406080100120140160012345STANDBY SUPPLY CURRENTvs. SUPPLY VOLTAGEMAX1668/1805 toc07SUPPLY VOLTAGE (V)SUPPLY CURRENT (µA)STBY = GNDADD0 = ADD1 = HIGH

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors6 _______________________________________________________________________________

MAX1668/MAX1805/MAX1989†Multichannel Remote/Local Temperature Sensors ________________________________________________________________________________

A/D Conversion SequenceIf a start command is written (or generated automaticallyin the free-running autoconvert mode), all channels areconverted, and

be 4in to 8in (typ) or more as long as the worst noisesources (such as CRTs, clock generators, memorybuses, and ISA/PCI buses) are avoided.2) Do not r