MAX6627/MAX6628 Remote 1C Accurate Digital Temperature Sensors with SPI-Compatible Serial Interface General Description Benefits and Features Accuracy The MAX6627/MAX6628 precise digital temperature 1C (max) from 0C T +125C, T = +30C sensors report the temperature of a remote sensor. The RJ A 2.4C (max) from -55C T +100C, remote sensor is a diode-connected transistor, typically RJ 0C T +70C a low-cost, easily mounted 2N3904 NPN type that A replaces conventional thermistors or thermocouples. The 12-Bit + Sign, 0.0625C Resolution devices can also measure the die temperature of other Low Power Consumption ICs, such as microprocessors (Ps) or microcontrollers 30A (typ) (MAX6628) (Cs) that contain an on-chip, diode-connected transistor. 200A (typ) (MAX6627) Remote accuracy is 1C when the temperature of the remote Operating Temperature Range (-55C to +125C) diode is between 0C and +125C and the temperature of the Measurement Temperature Range, Remote Junction (-55C to +145C) devices is +30C. The temperature is converted to a 12-bit + sign word with 0.0625C resolution. The architecture of the 0.5s (MAX6627) or 8s (MAX6628) Conversion Rate device is capable of interpreting data as high as +145C from SPI-Compatible Interface the remote sensor. The MAX6627/MAX6628 temperature +3.0V to +5.5V Supply Range should never exceed +125C. 8-Pin SOT23 and TDFN Packages These sensors are 3-wire serial interface SPI-compatible, Lead(Pb)-Free Version Available (TDFN Package) allowing the MAX6627/MAX6628 to be readily connected to a variety of Cs. The MAX6627/MAX6628 are read- Ordering Information appears at end of data sheet. only devices, simplifying their use in systems where only temperature data is required. Two conversion rates are available, one that continuously converts data every 0.5s (MAX6627), and one that converts data every 8s (MAX6628). The slower version provides minimal power consumption under all operating conditions Typical Operating Circuit (30A, typ). Either device can be read at any time and + 3V TO + 5.5V provide the data from the last conversion. 0.1F Both devices operate with supply voltages between +3.0V and +5.5V, are specified between -55C and V GND CC +125C, and come in space-saving 8-pin SOT23 and lead-free TDFN packages. MAX6627 MAX6628 Applications SDO Hard Disk Drive DXP Smart Battery Packs C 2200pF CS Industrial Control Systems DXN Notebooks, PCs SCK 19-2032 Rev 7 3/16MAX6627/MAX6628 Remote 1C Accurate Digital Temperature Sensors with SPI-Compatible Serial Interface Absolute Maximum Ratings (All voltages referenced to GND.) Continuous Power Dissipation (T = +70C) A V ..........................................................................-0.3V to +6V SOT23 (derate 9.7mW/C above +70C) ....................777mW CC SDO, SCK, DXP, CS ................................ -0.3V to (V + 0.3V) TDFN (derate 18.5mW/C above +70C) ...............1481.5mW CC DXN ......................................................................-0.3V to +0.8V Operating Temperature Range ......................... -55C to +125C SDO Pin Current Range ..................................... -1mA to +50mA Junction Temperature ......................................................+150C Current Into All Other Pins .................................................10mA Storage Temperature Range ............................ -65C to +150C ESD Protection (Human Body Model).............................2000V Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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 (3.0V V 5.5V, -55C T +125C, unless otherwise noted. Typical values are at T = +25C, V = +3.3V, unless otherwise CC A A CC noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TEMPERATURE 0C T +125C, T = +30C, RJ A -1.0 0.5 1 V = +3.3V CC -55C T +100C, 0C T +70C, RJ A -2.4 +2.4 V = +3.3V CC Accuracy (Note 1) C -55C T +145C, 0C T +70C, RJ A -4.5 +4.5 V = +3.3V CC -55C T +125C, -55C T RJ A -5.5 +5.5 +125C,V = +3.3V CC Power-Supply Sensitivity 0.25 0.7 C/V Resolution 0.0625 C MAX6627 0.5 Time Between Conversion t s SAMPLE Starts MAX6628 8 Conversion Time t 180 250 320 ms CONV POWER SUPPLY Supply Voltage Range V 3.0 5.5 V CC I Shutdown, V = +0.8V 5 SDO CC Supply Current, SCK Idle I ADC idle, CS = low 20 A IDLE I ADC converting 360 600 CONV MAX6627 200 400 Average Operating Current I A CC MAX6628 30 50 Power-On Reset (POR) V , falling edge 1.6 V CC Threshold High level 80 100 120 Current Sourcing for Diode A Low level 8 10 12 Maxim Integrated 2 www.maximintegrated.com