General DescriptionThe MAX6627/MAX6628 precise digital temperaturesensors report the temperature of a remote sensor. Theremote sensor is a diode-connected transistor, typicallya low-cost, easily mounted 2N3904 NPN type thatreplaces conventional thermistors or thermocouples.The MAX6627/MAX6628 can also measure the die tem-perature of other ICs, such as microprocessors (µPs) ormicrocontrollers (µCs) that contain an on-chip, diode-connected transistor. Remote accuracy is ±1°C when the temperature of theremote diode is between 0°C and +125°C and the tem-perature of the MAX6627/MAX6628 is +30°C. The tem-perature is converted to a 12-bit + sign word with0.0625°C resolution. The architecture of the device iscapable of interpreting data as high as +145°C fromthe remote sensor. The MAX6627/MAX6628 tempera-ture should never exceed +125°C. These sensors are 3-wire serial interface SPI™ compat-ible, allowing the MAX6627/MAX6628 to be readily con-nected to a variety of µCs. The MAX6627/MAX6628 areread-only devices, simplifying their use in systemswhere only temperature data is required.Two conversion rates are available, one that continu-ously converts data every 0.5s (MAX6627), and onethat converts data every 8s (MAX6628). The slower ver-sion provides minimal power consumption under alloperating conditions (30µA, typ). Either device can beread at any time and provide the data from the last con-version.Both devices operate with supply voltages between+3.0V and +5.5V, are specified between -55°C and+125°C, and come in space-saving 8-pin SOT23 andlead-free TDFN packages.ApplicationsHard Disk DriveSmart Battery PacksAutomotiveIndustrial Control SystemsNotebooks, PCsFeatures♦ Accuracy ±1°C (max) from 0°C ≤ TRJ≤ +125°C, TA= +30°C±2.4°C (max) from -55°C ≤ TRJ≤ +100°C,0°C ≤ TA≤ +70°C♦ 12-Bit + Sign, 0.0625°C Resolution♦ Low Power Consumption30µA (typ) (MAX6628)200µA (typ) (MAX6627)♦ Operating Temperature Range (-55°C to +125°C)♦ Measurement Temperature Range, RemoteJunction (-55°C to +145°C)♦ 0.5s (MAX6627) or 8s (MAX6628) Conversion Rate♦ SPI-Compatible Interface♦ +3.0V to +5.5V Supply Range♦ 8-Pin SOT23 and TDFN Packages♦ Lead(Pb)-Free Version Available (TDFN Package)MAX6627/MAX6628Remote ±1°C Accurate Digital TemperatureSensors with SPI-Compatible Serial Interface________________________________________________________________Maxim Integrated Products119-2032; Rev 5; 6/11Ordering InformationPART PIN-PACKAGE TOP MARK MAX6627MKA#TG16 8 SOT23 AEQD MAX6627MTA+T 8 TDFN-EP* AUT MAX6628MTA+T 8 TDFN-EP* AUU SPI is a trademark of Motorola, Inc.Pin Configurations appears at end of data sheet. SDOGND SCKμC+ 3V TO + 5.5VMAX6627MAX6628 CSDXPDXN2200pF0.1μFVCC Typical Operating CircuitNote: All devices are specified over the -55°C to +125°C oper-ating temperature range.#Denotes a RoHS-compliant device that may include lead(Pb)that is exempt under the RoHS requirements.+Denotes a lead-free/RoHS-compliant package.T = Tape and reel.*EP = Exposed pad.For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim's website at www.maxim-ic.com.MAX6627/MAX6628Remote ±1°C Accurate Digital TemperatureSensors with SPI-Compatible Serial Interface2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.(All voltages referenced to GND.)VCC...........................................................................-0.3V to +6VSDO, SCK, DXP, CS ...................................-0.3V to (VCC+ 0.3V)DXN .......................................................................-0.3V to +0.8VSDO Pin Current Range ......................................-1mA to +50mACurrent Into All Other Pins ..................................................10mAESD Protection (Human Body Model) .............................±2000VContinuous Power Dissipation (TA = +70°C)SOT23 (derate 9.7mW/°C above +70°C).....................777mWTDFN (derate 18.5mW/°C above +70°C)................1481.5mWOperating Temperature Range .........................-55°C to +125°CJunction Temperature......................................................+150°CStorage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°CSoldering Temperature (reflow) .......................................+260°CELECTRICAL CHARACTERISTICS(3.0V ≤ VCC≤ 5.5V, -55°C ≤ TA≤ +125°C, unless otherwise noted. Typical values are at TA= +25°C, VCC= +3.3V, unless otherwisenoted.)PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITSTEMPERATURE0°C ≤ TRJ ≤ +125°C, TA = +30°C,VCC = +3.3V-1.0 ±0.5 ±1-55°C ≤ TRJ ≤ +100°C, 0°C ≤ TA ≤ +70°C,VCC = +3.3V-2.4 +2.4-55°C ≤ TRJ ≤ +145°C, 0°C ≤ TA ≤ +70°C,VCC = +3.3V-4.5 +4.5Accuracy (Note 1)-55°C ≤ TRJ ≤ +125°C, -55°C ≤ TA ≤ +125°C,VCC = +3.3V-5.5 +5.5°CPower-Supply Sensitivity 0.25 0.7 °C/VResolution 0.0625 °CMAX6627 0.5Ti m e Betw een C onver si on S tar ts tSAMPLEMAX6628 8sConversion Time tCONV180 250 320 msPOWER SUPPLYSupply Voltage Range VCC3.0 5.5 VISDOShutdown, VCC = +0.8V 5IIDLEADC idle, CS = low 20Supply Current, SCK IdleICONVADC converting 360 600µAMAX6627 200 400Average Operating Current ICCMAX6628 30 50µAPower-On Reset (POR)ThresholdVCC, falling edge 1.6 VHigh level 80 100 120Current Sourcing for DiodeLow level 8 10 12µAMAX6627/MAX6628Remote ±1°C Accurate Digital TemperatureSensors with SPI-Compatible Serial Interface_______________________________________________________________________________________ 3ELECTRICAL CHARACTERISTICS (continued)(3.0V ≤ VCC≤ 5.5V, -55°C ≤ TA≤ +125°C, unless otherwise noted. Typical values are at TA= +25°C, VCC= +3.3V, unless otherwisenoted.)PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITSLOGIC INPUTS (CS, SCK)Logic Input Low Voltage VIL0.3 xVCCVLogic Input High Voltage VIH0.7 xVCCVInput Leakage Current ILEAKVCS = VSCK = GND or VCC1µALOGIC OUTPUTS (SDO)Output Low Voltage VOLISINK = 1.6mA