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MAXIM MAX6629 MAX6632 handbook

1. EP temperature sensors can perform conversions more often up to approximately four conversions per sec ond by reading the conversion results more often AX6629MUT 55 C to 125 C 6 SOT23 6 MAX6630 Applications AX6630 Cellular Automotive MAX6631 Hard Disk Drive Industrial Control aca HVAC Systems MAX6632 AX6632 Denotes a lead Pb free ROHS compliant package EP Exposed pad SPI is a trademark of Motorola Inc Typical Application Circuit Pin Configurations 3V TO 5 5V TOE MIEN Voc MAXUM MAX6629 MAX6630 MAX6631 MAXIM MAXIM MAX6632 MAX6629 MAX6630 SO MAX6631 b MAX6632 MIAXIL AVI Maxim Integrated Products 1 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 CEOOXVIN 6C99OXVIN MAX6629 MAX6632 12 Bit Sign Digital Temperature Sensors with Serial Interface ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND JUNCTION Temperat E eiiis onenean 150 C VOC i detinstedtts lt 4 ion cln tatu a a s a 0 3V 6 0V Operating Temperature Range Note 1 55 C to 150 C SO SOK CS raneta e a S 0 3V Vcc 0 3V Storage Temperature Range s s s 65 C to 150 C O E E E 1mA to 50mA Lead Temperature soldering 10S ccceeteeeteeees 300 C CUPERTINO ANY Pisne nre cutee 10mA Soldering Temperature
2. mounted as close as possible to that component and should share supply and ground traces if they are not noisy with that component where possible This maximizes the heat transfer from the com ponent to the sensor The MAX6629 MAX6630 supply current is typically 200UA and the MAX6631 MAX6632 supply current is typically 32uA When used to drive high impedance loads the device dissipates negligible power Therefore the die temperature is essentially the same as the package temperature The rise in die temperature due to self heating is given by the following formula ATJ PDISSIPATION X JA where PDISSIPATION is the power dissipated by the MAX6629 MAX6632 and JA is the package s thermal resistance The typical thermal resistance is 110 C W for the 6 pin SOT23 package To limit the effects of self heat ing minimize the output currents For example if the MAX6629 MAX6632 sink 1mA the output voltage is guaranteed to be less than 0 4V Therefore an addi tional 0 4mW of power is dissipated within the IC This corresponds to a 0 044 C shift in the die temperature in the 6 pin SOT23 MAXIM with Serial Interface Functional Diagram MAXIM MAX6629 MAX6630 MAX6631 MAX6632 TEMPERATURE SENSOR VOLTAGE REFERENCE 12 BIT SIGN XAADC SPI COMPATIBLE 7 intenrace SJ Chip Information PROCESS BiCMOS Package Information For the latest package outline information and land patterns go to ww
3. MAX6629 CONVERSION PERIOD MAX6630 0 5s 0 25s ADC CONVERSION TIME gt MAXIM MAX6631 MAX6632 0 25s ADC CONVERSION TIME gt A CU GC EU bg LUA ECA with Serial Interface LOGIC LINE WHERE Vi gic gt 3V MAXIM MAX6629 MAX6630 MAX6631 MAX6632 Figure 1 Powering the Sensor from a Logic Gate is not noisy as excessive noise on Vcc can affect tem perature measurement accuracy ADC Conversion Sequence The MAX6629 MAX6632 continuously convert temper ature to digital data Setting CS low stops any conver sion in progress places the device in idle mode and makes data available for reading Setting CS high starts a new conversion CS must remain high for at least 0 3s to allow for the conversion to be completed Figure 2 shows the timing relationship between conversion time and conversion rate SPI Digital Interface The MAX6629 MAX6632 are compatible with SPI seri al interface standards Figure 3 and are designed to be read only devices CS s rising edge always starts a new conversion and resets the interface CS must stay high for a minimum of 300ms to allow the conversion to MAXIM MAX6631 MAX6632 lt CONVERSION PERIOD Fa 8s Figure 2 Conversion Time and Rate Relationships MAXIM CE99IXVIN 6Z99XVN MAX6629 MAX6632 12 Bit Sign Digital Temperature Sensors with Serial Interface Figure 3
4. MAX6629 MAX6632 do not draw excessive currents at low supply voltages ensuring reliable operation from a gate output Note 4 Timing characteristics are guaranteed by design and are not production tested Note 5 CLoap total capacitance of one bus line in picofarads MAXI 3 CE99IXVN 6Z99XVN MAX6629 MAX6632 12 Bit Sign Digital Temperature Sensors with Serial Interface Typical Operating Characteristics Vcc 3 3V Ta 25 C unless otherwise noted OPERATING SUPPLY CURRENT vs TEMPERATURE POWER ON RESET POR THRESHOLD vs TEMPERATURE TEMPERATURE ERROR vs TEMPERATURE 400 z 26 a 3 s Vec 5 5V Veg 4 5V g OCSHE Vec 45 0V 24 8 x 350 0 Em 2 6 S 2 lt 2 300 20 18 z ce Vee 3 3V E m 0 5 250 y amp 16 we Vec 3 6V 2 2d jan 14 T 900 Vec 3 0V Z pa B g 12 Z 2 5 10 150 2 3 08 MAX6629 MAX6629 100 0 6 4 55 30 5 20 45 70 95 120 145 55 30 5 20 45 70 95 120 145 55 30 5 20 45 70 95 120 145 TEMPERATURE C TEMPERATURE C TEMPERATURE C TEMPERATURE ERROR vs POWER SUPPLY NOISE FREQUE
5. NCY RESPONSE TO THERMAL SHOCK 12 Tir SaUaRe WAVE 3 APPLIED TO Vcc WITH NO 3 125 3 10 F0 1uF CAPACITOR g 8 Z 7 100 8 2 S poe m 6 g 15 Vin 250mVp p A z 5 4 a 50 a gt a z Bs 2 25 0 0 10 100 4k 10k 100k iM 10M 100M 2 0 2 4 6 8 10 12 14 FREQUENCY Hz TIME s Pin Description FUNCTION MAX6629 MAX6631 MAX6630 MAX6632 No Connect Connect to ground plane for better thermal performance to the PC board Ground Supply Voltage Input Bypass Vcc to GND with a 0 1uF capacitor Vcc can also be powered from a logic output as long as the voltage level is greater than 3 0V and the logic output is not noisy Setting the logic output low provides a hardware shutdown mode Serial Clock Input Chip Select Input Enables the interface A rising edge off CS initiates the next conversion Pulling CS low initiates an idle state Serial Data Output Exposed Pad TDFN only Connect to GND or leave unconnected MAKLM 12 Bit Sign Digital Temperature Sensors Detailed Description The MAX6629 MAX6632 are local digital temperature sensors with a serial bus The MAX6629 MAX6632 are typically interfaced to a uC in temperature sensing and control applications The MAX6629 MAX6632 convert temperature to a 12 bit sign word with a 0 0625 C LSB The data is communicated through a simple serial interface with a CS chip select line SO data line and SCK clock
6. SPI Timing Diagram Table 1 Data Output Format Table 2 Temperature Data Format Two s Complement TEMPERATURE DIGITAL OUTPUT BINARY C D15 D3 D2 D1 D0 0 1001 0110 0000 0 0111 1101 0000 0 0001 1001 0000 O O O O 0 0625 0 0000 0000 0001 XX 0 0000 0000 0000 1 1111 1111 1111 1 1110 0111 0000 1 1100 1001 0000 same BA IE es A E ca O finish CS s falling edge stops any conversion in progress and data is latched into the shift register Then the data clocks out at SO on SCK s falling edge with the sign bit D15 first followed by the MSB Data is sent in one 16 bit word and CS must remain low until all 16 bits are transferred If CS goes high in the middle of a transmission it is necessary to wait the conversion time less than 300ms before attempting a new read The serial data is composed of 12 1 data bits D15 D3 and 3 trailing bits D2 D0 D2 is always low serving as the confirmation bit that the device has been communicated with The last 2 bits DO and D1 are undefined and are always in high impedance mode Table 1 The power up state for SO is high imped ance Figure 3 shows the detailed serial timing specifi cations for the SPI port The temperature data format is in two s complement format Table 2 Power Shutdown Mode The MAX6629 MAX6632 do not have a built in power software shutdown mode However a power shutdown mode is easily implemented utili
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8. line This interface can be directly connected to and is fully compatible with SPI inter faces This interface can also be connected to virtually any processor which has at least three general pur pose input output GPIO lines available to implement software bit banging The high resolution of the MAX6629 MAX6632 makes them especially useful in thermal control loops HVAC systems or in any system where quick anticipation of temperature trends is useful The MAX6629 MAX6632 can produce temperature data in excess of 150 C although they are specified for a maximum operating temperature of 150 C This extended temperature range makes it especially useful in automotive under hood applications The low power consumption is also ideal in battery operated and portable applications The MAX6631 MAX6632 are optimized for minimum power consumption with their 8s conversions The MAX6629 MAX66380 provide faster conversions 0 5s at the expense of power consumption The low quiescent supply current enables the device to be powered from a logic line or the output of a gate where the high leve exceeds 3V as shown in Figure 1 While the MAX6629 MAX6632 are not specifically equipped with a software shutdown mode the hardware shutdown can easily be implemented by setting the gate output to low Pulling CS low without a clock also puts the device in idle mode Take care to ensure that the logic output MAXIMA MAX6629 MAXIM MAX6630
9. oe nas MAKINI 12 Bit Sign Digital Temperature Sensors with Serial Interface General Description Features The MAX6629 MAX6632 are local digital temperature Low Power Consumption sensors with an SPI compatible serial interface The 324A typ MAX6631 MAX6632 temperature is converted to a 12 bit sign word with a resolution of 0 0625 C LSB An extended temperature 200A typ MAX6629 MAX6630 range provides useful readings up to 150 C 12 Bit Sign Resolution with 0 0625 C LSB These sensors are 3 wire serial interface SPI compati Accuracy ble allowing the MAX6629 MAX6622 to be readily con 1 C max from 0 C to 70 C nected to a variety of microcontrollers uCs The MAX6629 MAX6632 are read only devices simplifying their use in systems where only temperature data is required All four digital temperature sensors require very little supply current making them ideal for portable systems The MAX6631 MAX6632 perform a temperature to digi tal conversion once every 8s and require minimal aver age supply current 32uA typ The MAX6629 MAX6630 perform a conversion once every 0 5s and 150 C Extended Temperature Range SPI Compatible Serial Interface 3 0V to 5 5V Supply Range 6 Pin TDFN and SOT23 Packages Lead Free Version Available TDFN Package gt gt gt OH Ordering Information require only 200A typ supply current Any of these PART TEMP RANGE PIN PACKAGE MAX6629MTT 55 C to 125 C 6 TDFN
10. reflow Continuous Power Dissipation TA 70 C TORNE oinnes E a detent eea 260 C 6 Pin SOT23 derate 9 10mW C above 70 C 727mW SOT23 Ordering Information contains 245 C 6 Pin TDFN derate 24 4mW C above 70 C 1951mW SOT23 Ordering Information contains 240 C Note Itis not recommended to operate the device above 125 C for extended periods of time 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 any 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 ELECTRICAL CHARACTERISTICS Vcc 3 0V to 5 5V Ta 55 C to 125 C unless otherwise noted Typical values are at Vcc 3 3V and Ta 25 C Notes 2 and 3 PARAMETER SYMBOL CONDITIONS TEMPERATURE TA room temp Vcc 3 3V 0 8 0 2 0 8 0 C lt Ta lt 70 C Vcc 3 3V 1 0 0 2 1 0 20 C lt Ta lt 85 C Voc 3 3V 1 6 0 3 1 6 Accuracy 20 C lt Ta lt 100 C Voc 3 3V 2 3 0 5 2 3 40 C lt Ta lt 125 C Vcc 3 3V 3 2 0 8 3 2 Ta 2 55 C Vcc 3 3V 1 0 1 5 3 5 Ta 150 C Vcc 3 3V 5 0 1 5 6 5 Power Supply Sensitivity 0 2 0 6 Resolution 0 0625 Time Be
11. tween Conversion ISANPIE MAX6629 MAX6630 CS high 0 37 0 5 0 65 Starts MAX6631 MAX6632 CS high Conversion Time POWER SUPPLY Supply Voltage Range Shutdown Note 3 Vcc 0 8V Supply Current SCK Idle ADC idle Figure 2 CS low ADC converting Figure 2 MAX6629 MAX6630 MAX6631 MAX6632 Average Operating Current Power On Reset POR Threshold Vcc falling 2 MAKINI 12 Bit Sign Digital Temperature Sensors with Serial Interface ELECTRICAL CHARACTERISTICS continued Vcc 3 0V to 5 5V Ta 55 C to 125 C unless otherwise noted Typical values are at Vcc 3 3V and Ta 25 C Notes 2 and 3 PARAMETER SYMBOL CONDITIONS LOGIC INPUTS CS SCK Logic Input Low Voltage VIL Logic Input High Voltage Input Leakage Current VIN VGND or 5 5V LOGIC OUTPUTS SO Output Low Voltage ISINK 1 6mA TIMING CHARACTERISTICS es m a 5 Serial Clock Frequency SCK Pulse Width High SCK Pulse Width Low CS Fall to SCK Rise CLOAD 10pF CS Fall to Output Enable CLOAD 10pF CS Rise to Output Disable ed CLOAD 10pF SCK Fall to Output Data Valid tbo CLoap 10pF Note 2 Tested at a single temperature Specifications over temperature are guaranteed by design Note 3 The MAX6629 MAX6632 are not specifically equipped with a shutdown function Their low supply current permits powering them from the output of a logic gate This specification is given to ensure that the
12. w maxim ic com packages Note that a or in the package code indicates RoHS status only Package drawings may show a different suffix character but the drawing pertains to the package regardless of RoHS status PACKAGE TYPE 6 SOT23 6 TDFN EP PACKAGE CODE U6FH 6 T633 2 DOCUMENT NO 21 0058 21 0137 CEOOXVIN 6C99OXVIN MAX6629 MAX6632 12 Bit Sign Digital Temperature Sensors with Serial Interface Revision History REVISION REVISION DESCRIPTION PAGES CHANGED Initial release of MAX6629 Initial release of MAX3360 MAX3361 and MAX3362 changed Iconv from 600UA max to 650uA max in the Electrical Characteristics table Changed the lead temperature in the Absolute Maximum Ratings section replacing Note 2 with 300 C removed the JEDEC solder reflow boiler plating due to high temp solder paste for flip chips now in production Added the TDFN package Added to TDFN packages in the Ordering Information table Added soldering information to the Absolute Maximum Ratings section Added the TDFN exposed pad information to the Pin Description table Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time 8 Maxim Integrated Products 120 San Gabr
13. zing an unused logic gate A typical CMOS or TTL logic output has enough drive capability to serve as the power source if its out put voltage level exceeds 3V as shown in Figure 1 Drive the logic output low to provide a hardware shut down mode Idle Mode The MAX6629 MAX6632 can be put into idle mode by pulling CS low Data can be clocked out when the device is in idle mode Power On Reset POR The POR supply voltage of the MAX6629 MAX6632 is typically 1 6V Below this supply voltage the interface is inactive and the data register is set to the POR state 0 C When power is first applied and Vcc rises above 1 6V typ the device starts to convert although temperature reading is not recommended at Vcc levels below 3 0V MAKLM 12 Bit Sign Digital Temperature Sensors Applications Information Thermal Considerations The key to accurate temperature monitoring is good thermal contact between the MAX6629 MAX6632 pack age and the object being monitored In some applica tions the 6 pin SOT23 package is small enough to fit underneath a socketed uP allowing the device to moni tor the uP s temperature directly Accurate temperature monitoring depends on the thermal resistance between the object being monitored and the MAX6629 MAX6632 die Heat flows in and out of plastic packages primarily through the leads If the sensor is intended to measure the temperature of a heat generating component on the circuit board it should be

MAXIM MAX6629 MAX6632 handbook

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