Micheliolide_68370-47-8_DataSheet_MedChemExpress

Voltage Monitor with Adjustable HysteresisGeneral Description The MIC2778 is a voltage monitor—uniquely designed to detect two separate voltage thresholds—combined with a delay generator and logic. It is designed for monitoring the battery supply of portable digital systems, particularly PDAs, pagers, and cellular telephones.High- and low-voltage thresholds can be adjusted inde-pendently, allowing for wide hysteresis. Voltage detection thresholds are accurate to 2%.If the battery voltage falls below the low-voltage threshold, the output (RST) is asserted and latched, preventing system operation until the battery is replaced or recharged. Internal logic prevents the output from chattering due to battery recovery or load removal. The output is asserted for 140ms (minimum) when a fresh battery is inserted. For applications not requiring built-in delay, see MIC841.The IC’s power supply input is separate from the detector inputs, allowing the MIC2778 to be powered from a down-stream supply, such a boost converter. Supply current is extremely low (1µA, typical), making it ideal for portable applications.A high-precision 1% grade is available. The MIC2778 is sup-plied in Micrel’s IttyBitty™ 5-lead SOT-23-5 package.Typical ApplicationLi-Ion CellV OUT Cellular Telephone Battery MonitorFeatures• Optimized for PDAs, cellular telephones, pagers, and other battery-powered devices • Independently adjustable high- and low-voltage thresholds• Internal logic prevents battery-voltage-fluctuation chatter • High ±2% voltage threshold accuracy; 1% available • Built in 140ms (minimum) delay deglitches output• Extremely low 1µA typical supply current• For applications not requiring built-in delay, see MIC841• Immune to brief power supply transients • 5-lead SOT-23 packageApplications• PDAs • Pagers• Cordless phones• Consumer electronics • Embedded controllers •Personal electronicsMicrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • IttyBitty™ is a trademark of Micrel, Inc.Ordering InformationPart NumberAccuraryTemperature RangePackageStandard Marking Pb-Free Marking MIC2778-2BM5UFB MIC2778-2YM5UFB*2%-40°C to +85°C SOT-23-5MIC2778-1BM5UFAMIC2778-1YM5UFA*1%-40°C to +85°CSOT-23-5* Underscore indicates a Pb-Free part.Pin DescriptionPin NumberPin Name Pin Function1HTHHigh-Voltage Theshold (Input): Analog input to a comparator. When the level on this pin initially rises above V REF , the delay generator cycles and the RST remains low for a minimum of 140ms.2 GND Ground3LTHLow-Voltage Threshold (Input): Analog input to a comparator. This is the voltage monitor input assigned to detect a low voltage condition. When the level on this pin falls below V REF , RST is asserted and the condition is latched until V HTH > V REF .4 RSTReset (Output): Active-low, open-drain output. This output is asserted and latched when V LTH <V REF , indicating a low voltage condition. This state remains latched until V HTH > V REF .5 VDDPower Supply (Input): Independent supply input for internal circuitry.Pin ConfigurationHTHLTH GND SOT-23-5 (M5)Absolute Maximum Ratings (Note 1)Supply Voltage (V DD ) .......................................–0.3V to +7V Input Voltages (V HI , V LO ) .................................–0.3V to +7V RST Output Current (I RST ) .........................................20mA Storage Temperature (T S ) ........................–65°C to +150°C ESD Rating, Note 3 .......................................................2kVOperating Ratings (Note 2)Supply Voltage (V DD ) ..................................+1.5V to +5.5VInput Voltages (V RST , V LTH , V HTH ) ................–0.3V to +6.0V Ambient Temperature Range (T A ) ..............–40°C to +85°C Package Thermal Resistance ................................256°C/WElectrical Characteristics1.5V ≤ V DD ≤ 5.5V; T A = +25°C, bold values indicate –40°C ≤ T A ≤ +85°C; unless noted Symbol Parameter Condition Min Typ Max Units I DD Supply Current RST not asserted 1 2 µA I LTH, I HTH Input Leakage Current5pA10 nA V REF Reference Voltage1.240 V MIC2778-2 1.215 1.265 VMIC2778-11.228 1.252 V t DPropagation Delay V LTH = V REF(max) +100mV to 5 µsV REF(min) – 100mV t RESET Reset Pulse Width140 420 ms V RST Voltage-Low Reset RST asserted, I SINK = 1.6mA, V DD ≥ 1.6V 0.3 VRST asserted, I SINK = 100µA, V DD ≥ 1.2V,0.4VNote 1. Exceeding the absolute maximum rating may damage the device.Note 2. The device is not guaranteed to function outside its operating rating.Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.Note 4. V DD operating range is 1.5V to 5.5V. Output is guaranteed to be held low down to V DD = 1.2V.Timing DiagramV BATTV RST Propagation delays not shown for clarity.Note A. The MIC2778 ignores very brief transients.See “Applications Information” for details.Functional DescriptionThe MIC2778 monitors the voltage of a battery and detects when it is discharged below a programmed level. Upon be-ing replaced, or being recharged above a second higher programmed trip point, the output remains low for a minimum of 140ms and then sends a reset signal to a microprocessor or other downstream component.Voltage Low OutputThe voltage-low output (RST) is an active-low, open-drain output which sinks current when the MIC2778 detects a low input voltage.Functional DiagramR S TV V Trip PointsBattery voltage is monitored by a comparator via a voltage divider network. The divided voltage is compared to an in-ternal reference voltage. When the voltage at the LTH input pin drops below the internal reference voltage, the output pulls low. At this point, the voltage at HTH is assumed to be below the reference voltage.DelayAt power-on or when the battery is replaced or recharged, and the voltage at HTH exceeds the reference voltage, the output goes high after a minimum delay of 140ms.Applications InformationOutputSince the MIC2778 output is an open-drain MOSFET, most applications will require a pull-up resistor. The value of the resistor should not be too large or leakage effects may domi-nate. 470kΩ is the maximum recommended value.Programming the ThresholdsThe low-voltage threshold is calculated using:V V R1R2R3R2R3BAT(lo)REF =+++The high-voltage threshold is calculated using:V V R1R2R3R3BAT(hi)REF =++where, for both equations:V 1.240V REF =In order to provide the additional criteria needed to solve for the resistor values, the resistors can be selected such that they have a given total value, that is, R1 + R2 + R3 = R TOTAL . A value such as 1MΩ for R TOTAL is a reasonable value because it draws minimum battery current but has no significant effect on accuracy.When working with large resistors, a small amount of leak-age current can cause voltage offsets that degrade system accuracy. The maximum recommended total resistance from V BAT to ground is 3MΩ.Figure 1. Example CircuitOnce the desired trip points are determined, set the V BAT(hi) threshold first.For example, use a total of 1MΩ = R1 + R2 + R3. For a typical single-cell lithium ion battery, 3.6V is a good “high threshold” because at 3.6V the battery is moderately charged. Solving for R3:V 1.241M R3BAT(hi)=ΩR3344k =ΩOnce R3 is determined, the equation for V BAT(lo) can be used to determine R2. A single lithium-ion cell should not be discharged below 2.5V. Many applications limit the drain to 3.1V. Using 3.1V for the V BAT(lo) threshold allows calculationof the two remaining resistor values.V 3.1V 1.241M R2344k BAT(lo)==Ω+R256k =ΩR11M R2R3=−−ΩR1600k =ΩThe accuracy of the resistors can be chosen based upon the accuracy required by the system.Input TransientsThe MIC2778 is inherently immune to very short negative-going “glitches.” Very brief transients may exceed the V BAT(lo) threshold without tripping the output.As shown in Figure 2, the narrower the transient, the deeper the threshold overdrive that will be ignored by the MIC2778. The graph represents the typical allowable transient dura-tion for a given amount of threshold overdrive that will not generate a reset.20406080100120140M A X . T R A N S I E N T D U R A T I O N (µs )RESET COMP. OVERDRIVE,V REF –V LTH (mV)Input Trans ient Figure 2. Input Transient ResponseInterfacing to Processors With Bidirectional Reset PinsSome microprocessors have reset signal pins that are bidi-rectional, rather than input only. The Motorola 68HC11 family is one example. Because the MIC2778’s output is open drain, it can be connected directly to the processor’s reset pin using only the pull-up resistor normally required. See Figure 3.Figure 3. Interfacing to Bidirectional Reset PinPackage InformationSOT-23-5 (M5)MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USATEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnifyMicrel for any damages resulting from such use or sale.© 2004 Micrel Incorporated。

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如需更多信息，请通过以下方式联系我们：销售热线：400 810 0126电子邮箱：**********************公司网址：扫描二维码，关注维萨拉企业微信3目 录Indigo系列变送器Indigo200系列数据处理单元 (7)Indigo300数据处理单元 (9)Indigo510数据处理单元 (12)Indigo520数据处理单元 (15)用于抽检和校准的手持设备Indigo80手持式显示表头 (18)HMP80系列手持式湿度和温度探头 (21)DMP80系列手持式露点和温度探头 (23)HM70手持式湿度和温度仪 (26)HUMICAP® 手持式湿度温度仪表HM40系列 (29)DM70手持式露点仪 (33)MM70适用于现场检测的手持式油中微量水分和温度测试仪 (36)湿度和温度用于测量相对湿度的维萨拉HUMICAP® 传感器 (38)如何为高湿度应用选择合适的湿度仪表 (40)Insight PC机软件 (44)HMP1墙面式温湿度探头 (46)HMP3一般用途湿度和温度探头 (48)HMP4相对湿度和温度探头 (51)HMP5相对湿度和温度探头 (54)HMP7相对湿度和温度探头 (57)HMP8相对湿度和温度探头 (60)HMP9紧凑型湿度和温度探头 (63)TMP1温度探头 (66)适用于苛刻环境中湿度测量的HMT330系列温湿度变送器 (68)HMT370EX系列本安型温湿度变送器 (78)HMT310温湿度变送器 (84)HUMICAP® 温湿度变送器HMT120和HMT130 (87)适用于高性能暖通空调应用的HMW90系列湿度与温度变送器 (90)HMD60系列湿度和温度变送器 (92)HMD110/112和HMW110/112湿度和温度变送器 (96)适用于楼宇自动化高精度室外测量的HMS110系列温湿度变送器 (99)HMDW80系列温湿度变送器 (101)适用于楼宇自动化应用室外测量的HMS80系列温湿度变送器 (105)HMM100湿度模块 (107)适用于OEM应用的HMM105数字湿度模块 (109)HMM170温湿度模块 (111)INTERCAP® 温湿度探头HMP60 (113)4INTERCAP® 温湿度探头HMP63 (115)HUMICAP® 温湿度探头HMP110 (117)HUMICAP® 温湿度探头HMP113 (120)SHM40结构湿度测量套件 (122)HMK15湿度校准仪 (125)DTR500太阳辐射和雨水防护罩 (127)HMT330MIK气象安装套件 (129)适用于动力汽轮机进气测量的HMT300TMK汽轮机安装组件 (131)露点Vaisala DRYCAP® 传感器用于测量干燥过程中的湿度 (133)DMP5露点和温度探头 (135)DMP6露点探头 (138)DMP7露点和温度探头 (140)DMP8露点和温度探头 (142)DMT340系列露点和温度变送器 (145)适用于高温应用的DMT345和DMT346露点变送器 (151)DMT152露点变送器 (155)DMT143露点变送器 (157)DMT143L露点变送器 (160)用于冷冻干燥机的DMT132露点变送器 (162)DM70用DSS70A便携式采样系统和采样室 (164)DPT146露点和气压变送器 (166)DPT145多参数变送器 (168)二氧化碳适用于苛刻环境的维萨拉CARBOCAP® 测量传感器 (171)GMP343二氧化碳探头 (173)适用于CO2恒温箱的GMP231二氧化碳探头 (176)GMP251二氧化碳探头 (178)GMP252二氧化碳探头 (181)GM70手持式二氧化碳测试仪 (184)适用于苛刻通风要求应用的GMW90系列二氧化碳及温湿度变送器 (187)适用于智能控制通风系统 (DCV) 的GMW80系列二氧化碳、湿度和温度一体变送器 (190)按需控制通风系统中的GMD20系列二氧化碳变送器 (193)GMD110管道安装式二氧化碳变送器 (195)沼气MGP261多气体探头 (197)MGP262多气体探头 (199)油中水用于测量油中微水的维萨拉HUMICAP® 传感器 (201)MMP8油中水分探头 (203)MMT330系列油中微量水分与温度变送器 (205)5MMT310系列油中微量水分与温度变送器 (209)MMT162油中微量水分和温度变送器 (211)连续监测系统维萨拉viewLinc企业版服务器版本5.1 (213)AP10 VaiNet无线接入点 (215)用于连续监测系统的RFL100无线数据记录仪 (218)HMP115温湿度探头 (223)TMP115宽范围温度探头 (225)维萨拉温度与相对湿度数据记录仪系列DL2000 (227)维萨拉通用输入数据记录仪系列DL4000 (229)维萨拉多应用温度数据记录仪DL1016/1416 (231)维萨拉热电偶数据记录仪系列DL1700 (233)维萨拉中端温度、湿度及触点通道数据记录仪 (235)维萨拉vNet以太网供电数据记录仪接口 (238)溶解气体分析OPT100 Optimus™ 溶解气体分析(DGA)监测系统 (240)MHT410变压器油中微量水分、氢气和温度分析仪 (244)过氧化氢用于测量汽化过氧化氢、相对饱和度和相对湿度的维萨拉PEROXCAP® 传感器 (246)用于过氧化氢、湿度和温度测量的HPP270系列探头 (249)压力用于测量压力的维萨拉BAROCAP® 传感器 (253)PTU300气压、湿度和温度一体变送器 (255)适用于专业气象、航空与工业用户的PTB330数字式气压计 (260)气压传递标准PTB330TS (262)PTB210数字气压计 (265)PTB110气压计 (267)将风引起误差降低的SPH10/20静压头 (269)气象Vaisala用于工业应用测量的风和气象传感器技术 (271)风测量装置WA15 (273)WINDCAP® 超声波风传感器WMT700系列 (276)气象变送器WXT530系列 (278)服务支持面向仪表全生命周期服务 (280)67功能•数据处理单元 USB-C 端口支持使用通用 USB 电缆连接到维萨拉Insight PC 软件•数字和图形彩色显示屏（针对模拟型号提供可选的不带显示屏的款式）•IP65 外壳•24 V AC/DC 电源输入•Indigo201：3 个模拟输出（mA 或 V）•Indigo202：RS-485，带有Modbus ® RTU•2 个可配置的继电器维萨拉 Indigo200 系列数据处理单元是一种主机设备，它显示来自维萨拉 Indigo 兼容探头的测量值，同时也可通过模拟信号、Modbus RTU 通信或继电器将这些测量值传输到自动化系统。

1US Headquarters TEL +(1) 781-935-4850FAX +(1) 781-933-4318 • Europe TEL +(44) 1628 404000FAX +(44) 1628 404090Asia Pacific TEL +(852) 2 428 8008FAX +(852) 2 423 8253South America TEL +(55) 11 3917 1099FAX +(55) 11 3917 0817Superior elongation and tensilestrength help to prevent tearing in use due to mishandling. Typical properties for CHO-SEAL 1310 and 1273 materi-al are shown on pages 33 and 32respectively.High Shielding PerformanceCHO-SEAL 1310 material provides more than 80 dB of shielding effectiv-ness from 100 MHz to 10 GHz, while CHO-SEAL 1273 material provides more than 100 dB.Low Volume ResistivityBoth materials have exceptionally low volume resistivity, which makes them well suited for grounding appli-cations in which a flexible electrical contact is needed.Low Compression GasketSpacer gaskets are typicallydesigned to function under low deflec-tion forces. Chomerics uses design tools such as Finite Element Analysis (FEA) to accurately predict compres-sion-deflection behavior of various cross section options. Refer to page16.LCP Plastic SpacerLiquid crystal polymer (LCP)spacers, including those made with Vectra A130 material, provide aCHO-SEAL ®1310 or 1273Conductive ElastomersWith EMI spacer gaskets, shielding and grounding are provided by Chomerics’CHO-SEAL 1310 and 1273 conductive elastomers, specifi-cally formulated for custom shape molded parts. They provide excellent shielding and isolation against electro-magnetic interference (EMI), or act as a low impedance ground path between PCB traces and shielding media. Physically tough, these elas-tomers minimize the risk of gasket damage, in contrast to thin-walled extrusions or unsupported molded gaskets.Silicone-based CHO-SEAL 1310and 1273 materials offer excellent resistance to compression set over a wide temperature range, resulting in years of continuous service. CHO-SEAL 1310 material is filled with silver-plated-glass particles, while 1273 utilizes silver-plated-copper filler to provide higher levels of EMI shielding effectiveness.EMI Spacer GasketsThe unique design of Chomerics’EMI spacer gaskets features a thin plastic retainer frame onto which a conductive elastomer is molded. The elastomer can be located inside or outside the retainer frame, as well as on its top and bottom surface. EMI spacer gaskets provide a newapproach to designing EMI gaskets into handheld electronics such as dig-ital cellular phones. Board-to-board spacing is custom designed to fit broad application needs. Customized cross sections and spacer shapes allow for very low closure forcerequirements and a perfect fit in any design or device.Robotic InstallationSpacer gaskets can be installed quickly by robotic application. Integral locater pins in the plastic spacer help ensure accuratepositioning in both manual and pick-and-place assembly. Benefits include faster assembly and lower labor costs.The integrated conductive elastomer/plastic spacer gasket is a low cost,easily installed system for providing EMI shielding and grounding in small electronic enclosures.Figure 1Single Piece EMI Gasket/Locator PinsCHO-SEAL 1310 or 1273 Conductive Elastomer (Inside)Plastic Spacer Around Outsideor InsideApplications for EMI Spacer GasketsThe spacer gasket concept is especially suited to digital and dual board telephone handsets or other handheld electronic devices. It provides a low impedance path between peripheral ground traces on printed circuit boards and components such as:•the conductive coating on a plastic housing•another printed circuit board •the keypad assemblyTypical applications for EMI spacer gaskets include:•Digital cellular, handyphone and personal communications services (PCS) handsets •PCMCIA cards•Global Positioning Systems (GPS)•Radio receivers•Other handheld electronics, e.g.,personal digital assistants (PDAs)•Replacements for metal EMI shield-ing “fences” on printedcircuit boards in wireless tele-communications devicesstable platform for direct, highprecision molding of conductive elas-tomers. The Vectra A130 material described in Table 1 has excellent heat deflection temperature character-istics (489°F, 254°C). For weight con-siderations, the LCP has aspecific gravity of only 1.61. This plas-tic is also 100% recyclable.Typical EMI Spacer Gasket Design ParametersThe EMI spacer gasket concept can be considered using the design parameters shown in Table 2. Some typical spacer gasket profiles are shown below.Figure 2Typical Spacer Gasket Profiles3US Headquarters TEL +(1) 781-935-4850FAX +(1) 781-933-4318 • Europe TEL +(44) 1628 404000FAX +(44) 1628 404090Asia Pacific TEL +(852) 2 428 8008FAX +(852) 2 423 8253South America TEL +(55) 11 3917 1099FAX +(55) 11 3917 0817Finite Element AnalysisChomerics, a division of the Parker Hannifin Corporation’s Seal Group, is the headquarters of Parker Seal’s Elastomer Simulation Group. This unit specializes in elastomer finite element analysis (FEA) using MARC K6 series software as a foundation for FEA capability.Benefits of FEA include:•Quickly optimizing elastomer gasket designs•Allowing accurate predictions of alternate elastomer design concepts •Eliminating extensive trial and error prototype evaluationTypical use of FEA in EMI spacer gasket designs is to evaluate the force vs. deflection requirements of alternate designs.For example, onespacer design features a continuous bead of con-ductive elastomer molded onto a plastic spacer. An alternative designemploys an “interrupted bead,” where the interrup-tions (gaps left on the plastic frame) are sized to maintain the requiredlevel of EMI shielding. Figure 4illustrates these alternative designs.Gasket DeflectionFigure 5 compares the effect of continuous and interrupted elastomer gasket designs in terms of the force required to deflect the conductive elastomer. This actual cellular handset application required a spacer gasket with interrupted bead to meet desired deflection forces.Chomerics Designand Application ServicesChomerics will custom design a spacer for your application. Advice,analysis and design assistance will be provided by Chomerics Applications and Design engineers at no additional fee. Contact Chomerics directlyat the locations listed at the bottom of the page.Figure 3FEA Example of an EMISpacer Gasket Cross SectionFigure 4Continuous (top) and InterruptedElastomer GasketsFigure 5Typical Spacer Gasket Deflection。

1⁄8 DIN Digital Panel Temperature Meters For Thermocouple and RTD InputsSpecificationsDisplay: 5-digit, 14.2 mm (0.56") redLED, (-19999 to 99999)Power:AC Versions:AC Power: 85 to 250 Vac,50/60 Hz, 10 VA Isolation: 2300 Vrms for 1 minuteto all inputs Low Voltage Versions: DC Power: 11 to 36 Vdc, 11 WAC Power: 24 Vac, ± 10%,50/60 Hz, 10 VA Isolation: 500 Vrms for 1 minuteto all inputs (50V working)Keypad: 3 programmable function keys,5 keys total A/D Converter: 16-bit resolutioncapabilities to suit a wide range of industrial applications. These meters accept thermocouple or RTD inputs. The meters provide a maximum and minimum reading time. The capture time is used to prevent detection of false max or min readings which may occur events. These meters have been specifically designed for harsh industrial environments. With extensive testing of noise effects to CE requirements, the DP63400 reliable, application solution.U Thermocouple and RTD Panel MeterU 5-Digit, 14 mm (0.56") LEDU Conforms to ITS-90 StandardsU °F or °C Unit Overlay with BacklightU NEMX 4X (IP65)Update Rates: A/D Conversion Rate: 10 readings/s Step Response: 200 ms max to within 99% of final readout value (digital filter and internal zero correction disabled), 700 ms max (digital filter disabled, internal zero correction enabled) Display Update Rate: 1 to 10 updates/s Max/Min Capture Delay Time: 0 to 3275 s Low-Frequency Noise Rejection: Normal Mode: >60 dB @ 50 or 60 Hz ±1%, digital filter off Common Mode: >100 dB, DC to 120 Hz Memory: Non-volatile E 2PROM retains all programmable parameters and display values Environmental Conditions: Operating Temperature Range: 0 to 50°C (32 to 122°F) Storage Temperature Range: -40 to 60°C (-40 to 140°F) Operating and Storage Humidity: 0 to 85% max RH non-condensing Altitude: Up to 2000 m (6562')Connections: High-compression, cage-clamp terminal block Wire Strip Length: 7.5 mm (0.3")Wire Gage: 30 to 14 AWG copper wire Torque: 0.51 N/m (4.5 lb/in) max Construction: This unit is rated for NEMA 4X (IP65) outdoor use, IP20 touch-safe, Installation Category II, Pollution Degree 2, 1-piece bezel/case, flame-resistant, synthetic rubber keypad—panel gasket and mounting clip includedWeight: 200 g (7 oz)DP63400-T shown smaller than actual size.**Offset Range: -19,999 to 99,999 display units Input Impedance: 20 M ΩLead Resistance Effect: 0.03µV/ΩMaximum Continuous Overvoltage: 30VType: 3- or 4-wire, 2-wire can be compensated for lead wire resistance Excitation Current: 100 Ω Range: 165 µA 10 Ω Range: 2.6 mADirect ReadoutInput Range: -10 to 65 mV 0 to 400 Ω: High range0 to 25 Ω: Low rangeDisplay Range: -19999 to 99999Ordering Example: DP63400-T-LV, temperature input, 11 to 36 Vdc.100 Ω Range: 10 Ω/lead max 10 Ω Range: 3 Ω/lead max。