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1、General Description The MAX6627 MAX6628 precise digital temperature sensors report the temperature of a remote sensor The remote sensor is a diode connected transistor typically a low cost easily mounted 2N3904 NPN type that replaces conventional thermistors or thermocouples The MAX6627 MAX6628 can
2、also measure the die tem perature of other ICs such as microprocessors Ps or microcontrollers Cs that contain an on chip diode connected transistor Remote accuracy is 1 C when the temperature of the remote diode is between 0 C and 125 C and the tem perature of the MAX6627 MAX6628 is 30 C The tem per
3、ature is converted to a 12 bit sign word with 0 0625 C resolution The architecture of the device is capable of interpreting data as high as 145 C from the remote sensor The MAX6627 MAX6628 tempera ture should never exceed 125 C These sensors are 3 wire serial interface SPI compat ible allowing the M
4、AX6627 MAX6628 to be readily con nected to a variety of Cs The MAX6627 MAX6628 are read only devices simplifying their use in systems where only temperature data is required Two conversion rates are available one that continu ously converts data every 0 5s MAX6627 and one that converts data every 8s
5、 MAX6628 The slower ver sion provides minimal power consumption under all operating conditions 30 A typ Either device can be read 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 i
6、n the space saving 8 pin SOT23 package Applications Hard Disk Drive Smart Battery Packs Automotive Industrial Control Systems Notebooks PCs Features o 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 o 12 Bit Sign 0 0625 C Resolution o Low Power Consumption 30 A
7、typ MAX6628 200 A typ MAX6627 o Operating Temperature Range 55 C to 125 C o Measurement Temperature Range Remote Junction 55 C to 145 C o 0 5s MAX6627 or 8s MAX6628 Conversion Rate o SPI Compatible Interface o 3 0V to 5 5V Supply Range o 8 Pin SOT23 Package MAX6627 MAX6628 Remote 1 C Accurate Digita
8、l Temperature Sensors with SPI Compatible Serial Interface Maxim Integrated Products1 19 2032 Rev 1 7 01 For pricing delivery and ordering information please contact Maxim Dallas Direct at 1 888 629 4642 or visit Maxim s website at www maxim Ordering Information PARTTEMP RANGE PIN PACKAGE TOP MARK M
9、AX6627MKA T 55 C to 125 C8 SOT23 8AAEQ MAX6628MKA T 55 C to 125 C8 SOT23 8AAER SPI is a trademark of Motorola Inc Pin Configuration appears at end of data sheet SDO GND SCK C 3V TO 5 5V MAX6627 MAX6628 CS DXN 2200pF 2200pF 0 1 F VCC Typical Operating Circuit 元器件交易网w w w c e c b 2 b c o m MAX6627 MAX
10、6628 Remote 1 C Accurate Digital Temperature Sensors with SPI Compatible Serial Interface 2 ABSOLUTE MAXIMUM RATINGS Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or a
11、ny other conditions beyond those indicated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability All Voltages Referenced to GND VCC 0 3V to 6V SO SCK CS 0 3V to VCC 0 3V DXN 0 3V to 0 8V SO P
12、in Current Range 1mA to 50mA Current Into All Other Pins 10mA ESD Protection Human Body Model 2000V Continuous Power Dissipation TA 70 C 8 Pin SOT23 derate 9 7mW C above 70 C 777mW Operating Temperature Range 55 C to 125 C Junction Temperature 150 C Storage Temperature Range 65 C to 150 C Lead Tempe
13、rature soldering 10s Note 1 ELECTRICAL 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 otherwise noted PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS TEMPERATURE 0 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
14、 2 4 55 C TRJ 145 C 0 C TA 70 C VCC 3 3V 4 5 4 5 Accuracy 55 C TRJ 125 C 55 C TA 125 C VCC 3 3V 5 5 5 5 C Power Supply Sensitivity0 250 7 C V Resolution0 0625 C MAX66270 5 Ti m e Betw een C onver si on S tar tstSAMPLE MAX66288 s Conversion TimetCONV180250320ms POWER SUPPLY Supply Voltage RangeVCC3 0
15、5 5V ISDShutdown VCC 0 8V5 IIDLEADC idle CS low20Supply Current SCK Idle ICONVADC converting360600 A MAX6627200400 Average Operating CurrentICC MAX66283050 A Power On Reset POR Threshold VCC falling edge1 6V High level80100120 Current Sourcing for Diode Low level81012 A Note 1 This device is constru
16、cted using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board level solder attach and rework This limit permits only the use of the solder profiles recommended in the industry standard specification JEDEC 020A paragraph 7 6 Table 3 for IR VPR and Convection Reflow Preheating is required Hand or wave soldering is not allowed 元器件交易网w w w c e c b 2 b c o m MAX6627 MAX6628 Remote 1 C Accurate Digital Temperature Sensors w
