DIA1411 DIOO | Alldatasheet
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Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.JiangsuI TemperatureSensorwithI2CandSMBusInterface Features AEC-Q100qualified: − Deviceambienttemperature: -40°C≤TA ≤125°C − Devicejunction temperature: -40°C≤TJ ≤150°C Widesupplyvoltagerange:3.0Vto3.6V Inaccuracy: − ±1°C(Max.) from20°Cto110°C − ±2°C(Max.) from-40°Cto125°C 12-bitresolution:0.0625°C ProgrammableHighLimitandLowLimit( ALERT pin) ProgrammableSMBus(orI2C)address: Selectableby THERM/ADDRpull-upresistance (6Addresses) Operatingtemperaturerange:-40°Cto125°C Applications AutomotiveADASsystem Automotiveinfotainmentsystem Processortemperaturemonitoring PackageInformation Description The DIA1411 is high-precision sensor chip for temperature monitoring in automotive sub-systems. The on-chip 12-bit analog-to-digital converter (ADC) offers resolutions down to 0.0625°C. The device offersatypicalinaccuracyof±0.25°Cwithoutexternal componentsignalconditioning. The DIA1411 is compatible with the System Management Bus (SMBus) and Inter-Integrated Circuit (I2C) communication protocol. The DIA1411 can change the SMbus (or I2C) address by the resistance of different pull-up resistors on______ THERM/ADDRpin. The DIA1411 can operate at ambient temperatures from -40°C to 125°C and have programmable alarm function. SimplifiedSchematic PartNumber Package BodySize DIA1411 MSOP-8 3mm×3mm
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.JiangsuII ■ OrderingInformation OrderingPartNo. TopMarking MSL RoHS TA Package DIA1411MP8 DIAAD1A 3 Green -40to125°C MSOP-8 Tape&Reel,3000 If you encounter any issue in the process of using the device, please contact our customer service at marketing@dioo.com or phone us at (+86)-21-62116882. If you have any improvement suggestions regarding the datasheet, we encourage you to contact our technical writing team at docs@dioo.com. Your feedback is invaluable for us to provide a better user experience.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu III TableofContents
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu IV ListofFigures ListofTables
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 1. PinAssignmentandFunctions Pin Number Pin Name Type Description
1 SMDATA I/O SMBusdatainput/output,requiringpull-upresistor
2 SMCLK I SMBusclockinput,requiringpull-upresistor
ALERT OD Overtemperaturealert.Open-drainoutput;requiresapull-upresistor
4 GND Power Ground
Duringthepower-up,thedeviceselectsSMBus(orI2C)addressbased onthepull-upresistor.Duringthenormaloperation,thispinwillbe assertedtoindicateaThermLimitexceedingevent,requiringapull-up resistor. 6,7 NC - Noconnect. 8 VDD Power Supplyvoltage.Rangefrom3.0Vto3.6V
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 2. AbsoluteMaximumRatings ExceedingthemaximumratingslistedunderAbsoluteMaximumRatingswhendesigningislikelytodamagethe devicepermanently. Donotdesigntothemaximumlimitsbecauselong-timeexposuretothemmightimpactthe device’s reliability. The ratings are obtained over an operating free-air temperature range unless otherwise specified. Symbol Parameter Min Max Unit VDD Supplyvoltage -0.3 4 V V5VT_pin Voltageon5Vtolerantpins(SMCLK,SMDATA,_____ THERM/ADDR,and ALERT) -0.3 5.5 V |V5VT_pin-VDD| Voltageon5Vtolerantpins(SMCLK,SMDATA,_____ THERM/ADDR,and ALERT)(1) 0 3.6 V Vpin Voltageonanyotherpintoground -0.3 VDD + 0.3 V TA Operatingtemperaturerange -40 125 °C TSTG Storagetemperaturerange -55 150 °C TL Leadtemperaturerange RefertoJEDECspec.J-STD-020 Note: (1) Forthe5Vtolerant pinsthat haveapull-upresistor(SMCLK,SMDATA, THERM/ADDR,and ALERT),thepull-upvoltagemust notexceed3.6Vwhenthedeviceisunpowered. 3. RecommendedOperatingConditions Recommendedoperatingconditionsarespecifiedtoensureoptimalperformancetothedatasheetspecifications. Theratingsareobtainedover anoperatingfree-airtemperaturerange unlessotherwisespecified. Symbol Parameter Min Max Unit VDD Supplyvoltage 3.0 3.6 V 4. ESDRatings Whenastatically-chargedperson or objecttouches anelectrostatic discharge sensitive device,the electrostatic charge might be drained through sensitive circuitry in the device. If the electrostatic discharge possesses sufficientenergy,damagemightoccurtothedeviceduetolocalizedoverheating. Model Condition Rating Unit HBM Human-bodymodel(HBM),JEDEC:JS-001 ±8 kV CDM Charged-devicemodel(CDM),JEDEC:JS-002 ±2 kV
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 5. ThermalConsiderations The thermal resistance determines the heat insulation property of a material. The higher the thermal resistance is, the lower the heat loss. Accumulation of heat energy degrades the performance of semiconductor components. Symbol Metric Value Unit RθJA Junction-to-ambientthermalresistance 204 °C/W 6. ElectricalCharacteristics VDD =3.0Vto3.6V,TA =-40°Cto125°C,all typicalvaluesatTA =25°C,unlessotherwisenoted. Symbol Parameter Conditions Min Typ Max Unit Power VDD Supplyvoltage 3.0 3.3 3.6 V IDD Supplycurrent 1conv./sec, dynamicaveragingdisabled 270 µA 4conv./sec, dynamicaveragingenabled 600 16conv./sec, dynamicaveragingenabled 710 IDD Standbysupplycurrent Deviceinstandbymode,no SMBuscommunications, ALERT and THERM/ADDR pinsarenot asserted. 120 µA Internaltemperaturemonitor Temperatureinaccuracy Temperatureresolution 0.0625 °C Conversiontime tCONV Conversiontime Defaultsettings 43 ms ALERT and THERM/ADDR pins VOL Outputlowvoltage ISINK =8mA 0.4 V ILEAK Leakagecurrent ALERT and THERM/ADDR pins devicepoweredorunpowered TA <85°C pull-upvoltage≤3.6V ±5 µA SMBusinterface VIH Inputhighvoltage 5Vtolerant 2.0 VDD V VIL Inputlowvoltage 5Vtolerant -0.3 0.8 V
(1)Guaranteedbydigitaldesign. (3)Specificationssubjecttochangewithoutnotice. Figure 1. Two-wire timing diagram
Figure 2. Internal temperature error vs. Ambient temperature
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 9. FunctionDescription The DIA1411 is a temperature sensor chip compatible with SMBus (or I2C) communication protocols. The chip canmonitortheinternaltemperature.The ALERT or THERM/ADDRpinscanbeassertedtoachievetwolevels ofovertemperaturealarm. 9.1. Operatingmodes TheDIA1411hastwooperatingmodes,standbyandactive. Inthestandbymode,thechipsupportsSMBusandI2Cbutdoesnotconductconsecutivetemperaturedetection. Every timethe one shot register is written (see section 12.7), the device detects temperature for once.After the temperaturedetection iscompleted,thedeviceentersthe standby modeagain. In the active mode, the chip performs consecutive temperature detection and updates the temperature data in theregisters andthevalue ofthe statusregisters(seesection12.2) inreal-time.This isthedefaultstate. 9.2. Overtemperaturealarm The DIA1411 has THERM /ADDR output pin and ALERT output pin for overtemperature alarm. Both______ THERM/ADDRpin and ALERT pinsareopen-drainoutputs andrequirepull-upresistors. 9.2.1. ALERT pin The ALERT pin is an open-drain output, so that a pull-up resistor is needed. It has two modes of operation, named “Interrupt mode” and “Comparator mode”, which can be selected via the ALERT/COMP bit in the configurationregister(seesection 12.3). 9.2.1.1. Interruptmode Inthe interrupt mode,the ALERT pin is assertedwhen thetemperature measuring consecutively out-of-limit(≥ High Limit or < Low Limit) conditions is detected for the programmed number of times. The ALERT pin will remain assertedas long as an out-of-limitcondition remains.Once the out-of-limitcondition has been removed, the ALERT pin will remain asserted until the appropriate status bits are cleared. The appropriate status bits includeHighLimitstatusandLowLimitstatus bits,allofwhicharereadclear. The ALERT pin canbemaskedbysettingthe maskregister.Oncethe ALERT pin has been masked,it will be deassertedand remain deasserted until the maskregister is cleared by the user.No matter maskregister is set ornot,thestatus registers(seesection12.2)willbeupdatednormally. The ALERT pin can be used as an interrupt signal or as an SMBusAlert signal, which allows an SMBus client toreportanerrorconditiontothe host.Oneormore ALERT outputscanbehard-wiredtogether. 9.2.1.2. Comparatormode In the comparator mode, the ALERT pin will be asserted if the measured temperature exceeds the programmedHigh Limitfor the programmed number of times in a consecutive measurements.The ALERT pin willremainasserteduntilthemeasuredtemperaturedropsbelowtheHighLimitminustheThermHysteresis. In the comparator mode, the ALERT pin cannot be masked by mask register. The corresponding High Limit status bits will not be cleared until the ALERT pin is deasserted. Oncethe ALERT pin is deasserted, the High
Limitstatusbitswillbeautomaticallycleared. temperaturedropsbelowtheprogrammedThermLimitminustheThermHysteresis. functioncanreducethepower consumption. rateandthecorrespondingaveragingfactor. Table 1. Conversion rate and current consumption valuesabove127.9375°Carereportedas 127.9375°C.
Table 2. Temperature data format (1)ForDefaultRange,alltemperatures<0°Cwillbereportedas0°C. (2)ForDefaultRange,alltemperatures>127.9375°Cwillbereportedas127.9375°C. (3)ForExtendedRange,alltemperatures<-64°Cwillbereportedas-64°C. (4)ForExtendedRange,alltemperatures>191.9375°Cwillbereportedas191.9375°C. power-upthedevicemaynotrespondtoSMBus (orI2C)communications. Table 3. SMBus (or I2C) address decode
applicationinformation isnotpartofthe specification andis forreferencepurpose only. overtemperaturealarm.Typical applicationdiagramsforthechipisshowninFigure3. Figure 3. System design for DIA1411
- CommunicationProtocolandSMBusProtocol
WRbitcanbeeitherwriting orreadingdate. table3insection9.6"ProgrammingSMBus (orI2C)Address". sentmostsignificantbitatfirst.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 11.1.3. SMBusACKandNACK bits Allreceived databytesareacknowledgedby theSMBusclient.Thisisaccomplishedbytheclientdevicepulling theSMBusdata linelowaftereachsentbyte's eighthbit.This is trueoftheWriteByteprotocol. BykeepingtheSMBusdata linehighafterthe8thdata bithas beensent,thehostwillNACK (notacknowledge) thefinaldatabytethathasbeenreceivedfromtheclient. 11.1.4. SMBus timeout SMBus timeout function is supported by the DIA1411. The device resets its SMBus protocol if the clock line is maintained low for more than 30 ms. Setting the TIMEOUT bit in the consecutive ALERT register (see section 12.10)willenable thisfunction. 11.1.5. SMBus andI2Ccompatibility SMBus and I2C are both supported by the DIA1411. Here shows the key differences between SMBus and I2C devices. TheDIA1411supportI2Cfastmodeat400kHz,covering100kHz(maximumSMBus time). (1) 10kHzistheminimumfrequencyforSMBuscommunications. (2) The condition of resetting the SMBus client protocol is that the clock is kept at a logic “0” for longer than 30 ms. The timeout functionality is disabled by default while it is enabled by writing to the bit 7 in the consecutive ALERTregister (TIMEOUTbit).I2Cdoesn’thaveatimeout. (3) I2Cdevicescan’tsupporttheALERTresponseaddressfunctionalityand it’soptionalforSMBus. The DIA1411 SMBus interface will not respond to signals sent with an invalid slave address or an invalid protocol, and the register contents will remain unaffected. Stretching of the SMCLK signal is supported if the timingis managedbyotherSMBus components. 11.2. SMBusprotocol The DIA1411 supports various kind of byte protocols: Send bite, Read byte, Write byte, Receive byte andAlert responseaddressas validprotocols. (1) Writebyte:Writingonebyteofdatatotheregisters. (2) Readbyte:Readingonebyteofdata fromtheregisters. (3) Sendbyte:Settingtheinternaladdressregisterpointertothecorrectaddresslocation.Notedthat nodatais transferredduringtheSendbyteprotocol. (4) Receive byte: Reading data from a register when the internal register address pointer is at the correct locationviaSendbyte.Thisis usedforconsecutivereads ofthe sameregister. (5) Alert response address: the ALERT pin output can be interpreted as interrupt or as an SMBusAlert by the host. When the ALERT pin is asserted, the host will send the Alert Response Address (ARA) to the general addressof0001_100xb.TheDIA1411will respondtotheARAintwo steps:sendtheslaveaddressofDIA1411. ThentheMASKbitwillbesetand the ALERT pinwillbedeasserted.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu WriteByteProtocol Start Slave Address WR ACK(1) Register Address ACK(1) Register Data ACK(1) Stop 1->0 YYYY_ YYY 0 0 XXh 0 XXh 0 0->1 ReadByteProtocol Start Slave Address WR ACK(1) Register Address ACK(1) Start Slave Addres s RD ACK(1) Register Data(1) NACK Stop 1->0 YYYY_ YYY 0 0 XXh 0 1->0 YYYY_ YYY 1 0 XXh 1 0->1 SendByteProtocol Start SlaveAddress WR ACK(1) RegisterAddress ACK(1) Stop 1->0 YYYY_YYY 0 0 XXh 0 0->1 ReceiveByteProtocol Start SlaveAddress RD ACK(1) RegisterData(1) NACK Stop 1->0 YYYY_YYY 1 0 XXh 1 0->1 AlertResponseAddressProtocol Start AlertResponse Address RD ACK(1) DeviceAddress(1) NACK Stop 1->0 0001_100 1 0 YYYY_YYY 1 0->1 Note: (1)Dateissenttothehost.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 12.RegisterMaps TheregistersareaccessiblethroughtheSMBus(orI2C).Anentryof“Reserved”indicatesthatthebitisnotused andwillalways read“0”. Addr. R/W RegisterName FunctionDescription Default Value 00h R Internaldatahighbyte Storestheinteger datafortheinternal BJT 00h 02h R Status StoresthestatusbitsfortheinternalBJT 00h(or80h) 03h R/W Configuration Controlsthegeneraloperationofthedevice (mirroredataddress09h) 00h 04h R/W Conversionrate Controlstheconversionrateforupdatingtemperaturedata (mirroredataddress0Ah) 06h(4/sec) 05h R/W InternalHighLimit Storesthe8-bitHighLimitfortheinternalBJT (mirroredataddress0Bh) 55h(85°C) 06h R/W InternalLow Limit Storesthe8-bitLowLimitfortheinternalBJT (mirroredataddress0Ch) 00h(0°C) 09h R/W Configuration Controlsthegeneraloperationofthedevice (mirroredataddress03h) 00h 0Ah R/W Conversionrate Controlstheconversionrateforupdatingtemperaturedata (mirroredataddress04h) 06h(4/sec) 0Bh R/W InternalHighLimit Storesthe8-bitHighLimitfortheinternalBJT (mirroredataddress05h) 55h(85°C) 0Ch R/W InternalLow Limit Storesthe8-bitLowLimitfortheinternalBJT (mirroredataddress06h) 00h(0°C) 0Fh W Oneshot Awritetothisregisterinitiatesaoneshotupdate. 00h 11h R/W Scratchpad Scratchpadregisterforsoftwarecompatibility 00h 12h R/W Scratchpad Scratchpadregisterforsoftwarecompatibility 00h 1Fh R/W Mask Masktheinternal temperature 00h 20h R/W InternalThermLimit Storesthe8-bittemperaturethermallimitfortheinternal BJT 55h(85°C) 21h R/W ThermHysteresis Storesthe8-bithysteresisvaluethatappliestoallThermLimit 0Ah(10°C) 22h R/W ConsecutiveALERT Controlsthenumberofout-of-limitconditionsthatmustoccur beforeaninterruptisasserted 70h 29h R Internaldatalowbyte StoresthefractionaldatafortheinternalBJT 00h
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 35h R-C HighLimitstatus StatusbitsfortheHighLimit 00h 36h R-C LowLimitstatus StatusbitsfortheLowLimit 00h 37h R ThermLimitstatus StatusbitsfortheThermLimit 00h FDh R ProductID(DIA1411) Storesafixedvaluethatidentifiesthedevice B3h FEh R ManufacturerID StoresafixedvaluethatidentifiesDIOO DAh FFh R Revision Storesafixedvaluethatrepresentstherevisionnumber 05h Note:R=Read,W= Write,R-C= ReadthenClear. 12.1. Temperaturedataregister The measured temperature is stored as a 12-bit value with the high byte representing the integer data and the lowbyte representingthefractionaldata asshowninthefollowingregistertable. Itshouldbenotedthatwhenthetemperaturehighbyteregisterisread,thecorrespondinglowbyteiscopiedinto aninternal“shadow”register.Theuserisfree toreadthe lowbyteatany time.Nomatter thelowbyteisreador not,readingfromthesamehigh byteregisteragainwillautomatically refreshthisstoredlowbytedata. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default 00h R Internalhigh byte 128 64 32 16 8 4 2 1 00h 29h R Internallowbyte 0.5 0.25 0.125 0.0625 Reserved 00h Note:R=Read. 12.2. Statusregister The status register reports the ADC statues and the general error conditions. Bit 7 (BUSY) indicates that the ADC is currently converting at the time the status register is read. It may be read a “1” or a “0”. To identify the error condition, it is needed to read the High Limit status register, or Low Limit status register, or Therm Limit status register. Once the High Limit, or Low Limit, or Therm Limit register has been read or cleared, all the individualstatus register bitsarecleared andthecorrespondingstatus registerwillbecleared atthe sametime. Addr. Type Register B7 B6 B5 B4 B3 B1 B0 Default 02h R Status BUSY Reserved HIGH LOW THERM Reserved 00H (or80h) Note:R=Read. Bit Name Description 7 BUSY This bit indicates whether theADC is currently converting or not. “1” represents thanADC is currently converting. 6:5 Reserved Donot use.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 4 HIGH This bit will be set if the temperature exceeds its programmed High Limit. The ——— ALERT pin will be assertedoncethisbitisset. 3 LOW This bit will be set if the temperature drops below its programmed Low Limit. The ——— ALERT pin will be assertedoncethisbitisset. 1 THERM ThisbitwillbesetifthetemperatureexceedsitsprogrammedThermLimit.The THERM/ADDRpinwill beassertedoncethisbitisset. 0 Reserved Donot use. 12.3. Configurationregister Theconfigurationregister controlsthebasic operationofthedevice.Itis accessibleateitheraddress. Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 03h R/W Configuration Reserved RUN/ STOP ALERT/ COMP Reserved RANGE DAVG_ DIS Reserved 00h 09h Note:R=Read.W= Write. Bit Name Value Description 7 Reserved - Donotuse.
6 RUN/STOP
0(default) Thedeviceisintheactivemodeanddetectingthetemperatureinrealtime. 1 Thedeviceisinstandbymodeandnotdetectingthetemperatureinrealtime. ALERT/ COMP 0(default) The ——— ALERT pinactsininterruptmode.
1 The
——— ALERT pinactsincomparatormode. 4:3 Reserved - Donotuse.
2 RANGE
0(default) Thetemperaturemeasurementrangeisdefaultrange:0°Cto127.9375°. 1 Thetemperaturemeasurementrangeisextendedrange:-64°Cto191.9375°C.
1 DAVG_DIS
0(default) The dynamic averaging feature is enabled. The temperature will be converted with an averagingfactorthatisbasedontheconversionrate. 1 Thedynamicaveragingfeatureisdisabled. 0 Reserved - Donotuse. 12.4. Conversionrateregister The conversion rate register determines the updating frequency of temperature measurement. This register is accessibleateitheraddress. Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 04h R/W Conversionrate Reserved CONV[3:0] 06h (4/sec)0Ah Note:R=Read.W= Write.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu Bit Name Description 7:4 Reserved Donot use. 3:0 CONV [3:0] Conversionrate: CONV[3:0] Conversions /secondHex 3 2 1 0 4h 0 1 0 0 1 5h 0 1 0 1 2 6h 0 1 1 0 4(default) 7h 0 1 1 1 8 8h 1 0 0 0 16 0h-3hand 9h-Fh Allothers Notallowed 12.5. Limitregister The device contains both High Limit and Low Limits for the temperature. If the measured temperature exceeds the High Limit, then the corresponding status bit will be set and the ALERT pin is asserted. Likewise, if the measuredtemperature isless than theLow Limit,thecorrespondingstatus bitwill besetand the ALERT pin is asserted. Note that thedata formatforthe limits mustmatchtheselected data formatforthe temperature.If the extended temperaturerangeis used,thelimitsmustbeprogrammedintheextendeddataformat. Thelimitregisterswith multipleaddressesareaccessibleateither address. Whenthedeviceisinthestandbymode,updatingthelimitregisterswillhavenoeffectuntilthenewtemperature measurement results updating. Writing to the one shot register or clearing the RUN/STOP bit will both initiate a newtemperaturemeasurement. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default 05h R/W InternalHigh Limit 128 64 32 16 8 4 2 1 55h(85°C) 0Bh 06h R/W InternalLow Limit 128 64 32 16 8 4 2 1 00h(0°C) 0Ch Note:R=Read.W= Write.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 12.6. Scratchpadregisters Twoscratchpadregistersareusedforplaceholderstobesoftwarecompatible withlegacyprograms. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default 11h R/W Scratchpad 7 6 5 4 3 2 1 0 00h 12h R/W Scratchpad 7 6 5 4 3 2 1 0 00h Note:R=Read.W= Write. 12.7. Oneshotregister When the device is configured in standby mode and the BUSY bit is “0”, writing to the one shot register will immediatelyinitiateanewsingletemperaturemeasurements.However,writingtotheoneshotregisterwhilethe deviceisinactivemodewill havenoeffect. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default 0Fh W Oneshot Writingtothisregisterinitiatesasingleconversioncycle. Dataisnotstoredandalwaysreads00h. 00h Note:W=Write. 12.8. ThermLimitregisters The Therm Limit registers are used to set temperatures for thermal event. Once the measured temperature exceeds the corresponding Therm Limit, the THERM/ADDR pin is asserted. Note that the limit setting data formatmustmatchthechosendataformatofthetemperaturereading registers. The THERM/ADDR pin cannot be masked by the MASK bit. Additionally, the THERM/ADDR pin will be deasserted once the measured temperature drops below the corresponding Therm Limit minus the Therm Hysteresis. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default 20h R/W InternalTherm Limit 128 64 32 16 8 4 2 1 55h (85°C) 21h R/W Therm Hysteresis 128 64 32 16 8 4 2 1 0Ah (10°C) Note:R=Read.W= Write. 12.9. Maskregister The mask register is used to determine whether the temperature is masked or not. When the temperature is masked,the ALERT pin will not beasserted evenwhen the temperatureis out oflimit.Nomatter the MASK bit issetor not,thestatusregisterswillbeupdatednormally.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 1Fh R/W Mask Reserved MASK 00h Note:R=Read.W= Write. Bit Name Value Description 7:1 Reserved - Donotuse.
0 MASK
0(default) Thetemperaturemaskisdisabled. 1 Thetemperaturemaskisenabled. 12.10. ConsecutiveALERTregister The consecutiveALERTregister is used to choose how many times an out-of-limit (≥ High Limit or < Low Limit) condition have been detected in consecutive measurements before the ALERT or THERM/ADDR pin is asserted.Additionally,theTIMEOUTbit(B7) is usedtoenable ordisabletheSMBus timeout. When an out-of-limit condition is detected in consecutive measurements, the consecutive alert counter will be increasedby1.Thecounter willberesetifnoout-of-limitconditionoccursinaconsecutivemeasurement. When the ALERT pin is configured in the interrupt mode, if the consecutive alert counter reaches its programmed value, the STATUS bit and the last out-of-limit condition will be set to ‘1’.And the ALERT pin will beasserted.Thentheconsecutivealertcounterwillbecleared. When the ALERT pin is configured in comparator mode, the consecutive alert counter will be increased by 1 only when the measured temperature exceeds the High Limit. Once the consecutive alert counter reaches the programmedlimit,the ALERT pinwillbeasserted.However,theconsecutivealertcounterwillnotbereset.And itwillremainsetuntilthetemperaturedrops belowtheHighLimitminus theThermHysteresis. Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 22h R/W Consecutive ALERT TIME OUT CTHRM[2:0] CALRT[2:0] Reserved 70h Note:R=Read.W=Write. Bit Name Description
7 TIMEOUT
0 (default): The SMBus Timeout function is disabled. The device will not resetting its SMBus protocol eventheSMCLK linebeingheldlowindefinitely. 1:TheSMBusTimeoutfunctionisenabled.ThedevicewillresettheSMBusprotocoliftheSMCLKlineis heldlowformorethan30ms. 6:4 CTHRM [2:0] Determines the number of consecutive temperature measurementsthat mustexceed the corresponding Therm Limit before the THERM/ADDR pin is asserted. The consecutive therm counter will be increased by1wheneverthetemperaturemeasurementexceedtheThermLimit. Oncethemeasuredtemperaturedropsbelow theThermLimit,thecorrespondingthermcounterisreset. Once the THERM/ADDR pin has been asserted, the therm counter will not reset until the measured temperaturedropsbelow theThermLimitminustheThermHysteresis.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu The consecutive alert bits CTHRM[2:0] are decoded as shown in the following table. The default setting is4consecutiveout oflimitmeasurements. 3:1 CALRT [2:0] Determines the number of consecutive temperature measurements that must meet an out of limit condition before the ——— ALERT pin is asserted. The consecutive alert bits CALRT[2:0] are decoded as showninthefollowingtable.Thedefaultsettingis1consecutiveoutoflimitmeasurements. 0 Reserved Donotuse. Consecutivealert/Therm settings 2 1 0 Numberofconsecutiveoutoflimit measurements 0 0 0 1(defaultforCALRT[2:0]) 0 0 1 2 0 1 1 3 1 1 1 4(default forCTHRM[2:0]) 0 1 0 1 0 0 1 0 1 1 1 0 12.11. HighLimitstatusregister In the interrupt mode, the High Limit status register indicates if the measured temperature exceeds the High Limit for the programmed number of times in a consecutive measurements. Reading from the High Limit status registerwillclearall bits.AndtheHIGHstatusbit inthe statusregisterwillalsobecleared. In the comparator mode, the High Limit status register indicates if the measured temperature exceeds the High Limitfortheprogrammednumberoftimesinaconsecutivemeasurements.OncetheHighLimitstatusbitisset, it will remain set until the measured temperature drops below the High Limit minus the Therm Hysteresis. ReadingfromtheHighLimitstatusregisterwillnotclear allbits. In both interrupt mode and comparator mode, the HIGH status bit in the status register will be set if the High Limit status bit is set. The HIGH status bit in the status register will be cleared when High Limit status bit is cleared. Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 35h R-C HighLimit status Reserved IHIGH 00h Note:R-C=ReadthenClear.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu Bit Name Description 7:1 Reserved Donot use. 0 IHIGH ThisbitissetwhenthemeasuredtemperatureexceedsitsprogrammedHighLimit. 12.12. LowLimitstatusregister In the interrupt mode, the Low Limit status register indicates if the measured temperature drops below the Low Limit for the programmed number of times in a consecutive measurements. Reading from the Low Limit status register will clear all bits. And the Lowstatus bit inthe status register willalso be cleared.The LOWstatus bitin thestatusregisterwillbesetiftheLOWstatus bitisset. Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 36h R-C Low Limit status Reserved ILOW 00h Note:R-C=ReadthenClear. Bit Name Description 7:1 Reserved Donotuse.
0 ILOW
This bit will be set if the measured temperature drops below the Low Limit for the programmed numberoftimesinaconsecutivemeasurements. 12.13. ThermLimitstatusregister The Therm Limit status register indicates if the measured temperature exceeds the Therm Limit for the programmednumberoftimesinaconsecutivemeasurements.ReadingfromtheThermLimitstatusregisterwill notclearall bits.TheTHERMstatus bitinthestatusregisterwillbesetiftheThermLimitstatus registerisset. OncetheThermLimitstatusregisterisset,theTHERMstatusbitinthestatusregister willbeset.Readingfrom theThermLimitstatusregisterwillnotclearall bits.OncetheThermLimitstatus registeris set,itwillbecleared when the measured temperature drops below the Therm Limit minus the Therm Hysteresis. The THERM status bitinthestatusregister willbecleared whentheThermLimitstatusregister arecleared. Addr. Type Register B7 B6 B5 B4 B3 B2 B1 B0 Default 37h R-C ThermLimit status Reserved ITHERM 00h Note:R-C=ReadthenClear. Bit Name Description 7:1 Reserved Donotuse.
0 ITHERM This bit will be set if the measured temperature exceeds the Therm Limit for the programmed
numberoftimesinaconsecutivemeasurements.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 12.14. ProductIDregister TheproductIDregisterholdsaspecificvaluethatidentifies thedevice. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default FDh R ProductID (DIA1411) 1 0 1 1 0 0 1 1 B3h Note:R=Read. 12.15. ManufacturerIDregister The manufacturer ID register contains an 8-bit word that identifies the DIOO as the manufacturer of the DIA1411. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default FEh R DIOOID 1 1 0 1 1 0 1 0 DAh Note:R=Read. 12.16. Revisionregister Therevisionregister containsan8-bitwordthatidentifiesthe dierevision. Addr. R/W Register B7 B6 B5 B4 B3 B2 B1 B0 Default FFh R Revision 0 0 0 0 0 1 0 1 05h Note:R=Read.
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu 13.PhysicalDimensions:MSOP8 CommonDimensions (Unitsofmeasure=Millimeter) Symbol Min Nom Max A - - 1.10 A1 0.05 0.10 0.15 A2 0.75 0.85 0.95 A3 0.30 0.35 0.40 b 0.25 - 0.38 b1 0.24 0.30 0.33 c 0.15 - 0.20 c1 0.14 0.15 0.16 D 2.90 3.00 3.10 E 4.75 4.90 5.05 E1 2.90 3.00 3.10 e 0.55 0.65 0.75 L 0.40 0.55 0.70 L1 0.95REF L2 0.25BSC R 0.07 - - R1 0.07 - - θ 0° - 8° θ1 9° 12° 15°
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu
Version1.1,Sep2025 www.dioo.com ©2025DiooMicrocircuitsCo.,Ltd.Jiangsu Disclaimer This specification and information contained herein are provided on an “AS IS” basis and WITHALLFAULTS.Allproductspecifications,statements,information,anddata(collectively, the “Information”) in this datasheet or made available on the website of www.dioo.com are subject to change without notice. The customer is responsible for checking and verifying the extenttowhichtheInformationcontainedinthispublicationisapplicabletohis/herapplication. AllInformationgivenhereinisbelievedtobeaccurateandreliable,butitispresentedwithout guarantee,warranty,orresponsibilityofanykind,expressorimplied.