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DS1921H Datasheet(PDF) 41 Page - Maxim Integrated Products |
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DS1921H Datasheet(HTML) 41 Page - Maxim Integrated Products |
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41 / 45 page  DS1921H/Z 41 of 45 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS NOTES IO pin, 1-Wire Reset, Presence Detect Cycle Reset Low Time tRSTL Standard Speed, VPUP > 4.5V 480 640 µs 1, 15 Standard Speed 540 640 Overdrive Speed 48 80 Presence Detect High tPDH Standard Speed 15 60 µs 15 Time Overdrive Speed 1.1 6 Presence Detect Low tPDL Standard Speed 60 270 µs 15 Time Overdrive Speed 7.5 24 Presence Detect tMSP Standard Speed 60 75 µs 1, 16 Sample Time Overdrive Speed 6 8.6 IO pin, 1-Wire Write Write-0 Low Time tW0L Standard Speed 60 120 µs 1, 15 Overdrive Speed 6 15 Write-1 Low Time tW1L Standard Speed 5 15 - ε µs 1, 11 Overdrive Speed 1 2 - ε IO pin, 1-Wire Read Read Low Time tRL Standard Speed 5 15 - δ µs 1, 12 Overdrive Speed 1 2 - δ Read Sample Time tMSR Standard Speed tRL + δ 15 µs 1, 12 Overdrive Speed tRL + δ 2 Real-Time Clock Frequency Deviation ∆ F -5°C to +46°C -48 +46 PPM Temperature Converter Tempcore Operating TTC DS1921H 15 46 °C Range DS1921Z -5 +26 Conversion Time tCONV 75 360 ms Thermal Response Time Constant τ RESP 130 s 13 Conversion Error ∆ϑ -1 +1 °C 17, 18 Number of Conversions NCONV (see graphs) — 14, 16 NOTES 1) System Requirement. 2) Maximum allowable pull-up resistance is a function of the number of 1-Wire devices in the system and 1-Wire recovery times. The specified value here applies to systems with only one device and with the minimum 1-Wire recovery times. For more heavily loaded systems, an active pull-up such as that found in the DS2480B may be required. 3) Capacitance on IO could be 800pF when power is first applied. If a 2.2k Ω resistor is used to pull up the data line, 2.5µs after VPUP has been applied the parasite capacitor will not affect normal communication. 4) Input load is to ground. 5) All voltages are referenced to ground. 6) VTL, VTH are a function of the internal supply voltage. 7) Voltage below which, during a falling edge on IO, a logic 0 is detected. 8) The voltage on IO needs to be less or equal to VILMAX whenever the master drives the line low. |
Similar Part No. - DS1921H |
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Similar Description - DS1921H |
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