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DS1922L Datasheet(PDF) 3 Page - Maxim Integrated Products |
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DS1922L Datasheet(HTML) 3 Page - Maxim Integrated Products |
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3 / 50 page  DS1922L/DS1922T 3 of 50 I/O Pin, 1-Wire Read Standard speed 5 15 - δ Read Low Time (Notes 1, 14) tRL Overdrive speed 1 1.95 - δ µs Standard speed tRL + δ 15 Read Sample Time (Notes 1, 14) tMSR Overdrive speed tRL + δ 1.95 µs Real Time Clock Accuracy See RTC Accuracy Graphs min/ month -40°C to +85°C -300 +60 Frequency Deviation Δ F 0°C to +125°C -600 +60 PPM Temperature Converter tCONV 8-bit mode 30 75 Conversion Time (Note 15) 16-bit mode (11 bits) 240 600 ms Thermal Response Time Constant (Note 16) τ RESP iButton package 130 s Conv. Error Without Software Correction (Notes 17, 19) Δϑ See Temperature Accuracy Graphs °C Conv. Error With Software Correction (Notes 18, 19) Δϑ See Temperature Accuracy Graphs °C Note 1: System Requirement Note 2: Maximum allowable pullup 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 pullup such as that found in the DS2480B may be required. Note 3: Capacitance on the data pin could be 800pF when VPUP is first applied. If a 2.2kΩ resistor is used to pull up the data line, 2.5µs after VPUP has been applied the parasite capacitance will not affect normal communications. Note 4: VTL, VTH are a function of the internal supply voltage. Note 5: Voltage below which, during a falling edge on I/O, a logic '0' is detected. Note 6: The voltage on I/O needs to be less or equal to VILMAX whenever the master drives the line low. Note 7: Voltage above which, during a rising edge on I/O, a logic '1' is detected. Note 8: After VTH is crossed during a rising edge on I/O, the voltage on I/O has to drop by VHY to be detected as logic '0'. Note 9: The I-V characteristic is linear for voltages less than 1V. Note 10: The earliest recognition of a negative edge is possible at tREH after VTH has been previously reached. Note 11: Highlighted numbers are NOT in compliance with the published iButton standards. See comparison table below. Note 12: Interval during the negative edge on I/O at the beginning of a Presence Detect pulse between the time at which the voltage is 90% of VPUP and the time at which the voltage is 10% of VPUP. Note 13: ε represents the time required for the pullup circuitry to pull the voltage on I/O up from V IL to VTH. Note 14: δ represents the time required for the pullup circuitry to pull the voltage on I/O up from V IL to the input high threshold of the bus master. Note 15: To conserve battery power, use 8-bit temperature logging whenever possible. Note 16: This number was derived from a test conducted by Cemagref in Antony, France, in July of 2000. http://www.cemagref.fr/English/index.htm Test Report No. E42. Note 17: Includes +0.1/-0.2 oC calibration chamber measurement uncertainty. Note 18: Assumes using calibration memory with calibration equations for error compensation. Includes +0.1/-0.2 oC calibration chamber measurement uncertainty. Guaranteed by design. Note 19: WARNING: Not for use as the sole method of measuring or tracking temperature and/or humidity in products and articles that could affect the health or safety of persons, plants, animals, or other living organisms, including but not limited to foods, beverages, pharmaceuticals, medications, blood and blood products, organs, flammable, and combustible products. User shall assure that redundant (or other primary) methods of testing and determining the handling methods, quality, and fitness of the articles and products should be implemented. Temperature and/or humidity tracking with this product, where the health or safety of the aforementioned persons or things could be adversely affected, is only recommended when supplemental or redundant information sources are used. Data logger products are 100% tested and calibrated at time of manufacture by Dallas Semiconductor/Maxim to ensure that they meet all data sheet parameters, including temperature accuracy. User shall be responsible for proper use and storage of this product. As with any sensor-based product, user shall also be responsible for occasionally rechecking the temperature accuracy of the product to ensure it is still operating properly. Note 20: Guaranteed by design, not production tested to -40°C or 125°C. STANDARD VALUES DS1922L/T VALUES STANDARD SPEED OVERDRIVE SPEED STANDARD SPEED OVERDRIVE SPEED PARAMETER NAME MIN MAX MIN MAX MIN MAX MIN MAX tSLOT (incl. tREC) 61µs (undef.) 7µs (undef.) 65µs 1) (undef.) 9.5µs (undef.) tRSTL 480µs (undef.) 48µs 80µs 690µs 720µs 70µs 80µs tPDH 15µs 60µs 2µs 6µs 15µs 63.5µs 2µs 7µs tPDL 60µs 240µs 8µs 24µs 60µs 287µs 7µs 28µs tW0L 60µs 120µs 6µs 16µs 60µs 120µs 7.5µs 12µs 1) Intentional change, longer recovery time requirement due to modified 1-Wire front end. |
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