EVALUATION KIT AVAILABLE 1C, SMBus-Compatible Remote/ MAX6642 Local Temperature Sensor with Overtemperature Alarm General Description Benefits and Features The MAX6642 precise, two-channel digital temperature Integrated Temperature Sensor Enables Simultaneous sensor accurately measures the temperature of its own Dual Temperature (Remote and Local) Measurements die and a remote PN junction and reports the tempera- Remote Accuracy 1C ture data over a 2-wire serial interface. The remote PN Local Accuracy 2C from +60C to +100C junction is typically a substrate PNP transistor on the Measures Remote Temperature up to +150C die of a CPU, ASIC, GPU, or FPGA. The remote PN 0.25C Resolution junction can also be a discrete diode-connected small- Dual Zone Monitoring Automates Over-Temperature signal transistor. Alarms The 2-wire serial interface accepts standard system Programmable Remote/Local Temperature management bus (SMBus), Write Byte, Read Byte, Thresholds Send Byte, and Receive Byte commands to read the ALERT Output temperature data and to program the alarm thresholds. Small Footprint To enhance system reliability, the MAX6642 includes an 3mm x 3mm TDFN Package with Exposed Pad SMBus timeout. The temperature data format is 10 bit Low Thermal Mass Reduces Measurement Latency with the least significant bit (LSB) corresponding to 2 SMBus/I C Address Hardwired +0.25C. The ALERT output asserts when the local or remote overtemperature thresholds are violated. A fault queue may be used to prevent the ALERT output from Ordering Information setting until two consecutive faults have been detected. PART TEMP RANGE PIN-PACKAGE Measurements can be done autonomously or in a sin- MAX6642ATT90-T -40C to +125C 6 TDFN-EP* gle-shot mode. MAX6642ATT92-T -40C to +125C 6 TDFN-EP* Remote accuracy is 1C maximum error between MAX6642ATT94-T -40C to +125C 6 TDFN-EP* +60C and +100C. The MAX6642 operates from -40C to +125C, and measures remote temperatures MAX6642ATT96-T -40C to +125C 6 TDFN-EP* between 0C and +150C. The MAX6642 is available in MAX6642ATT98-T -40C to +125C 6 TDFN-EP* a 6-pin TDFN package with an exposed pad. MAX6642ATT9A-T -40C to +125C 6 TDFN-EP* MAX6642ATT9C-T -40C to +125C 6 TDFN-EP* Applications MAX6642ATT9E-T -40C to +125C 6 TDFN-EP* Desktop Computers T = Tape and reel. Notebook Computers *EP = Exposed pad. Servers Thin Clients Pin Configuration and Functional Diagram appear at end of data sheet. Test and Measurement Workstations Typical Operating Circuit Graphic Cards 3.3V Selector Guide 0.1F 47 TOP PART MEASURED TEMP RANGE MARK 10k EACH V CC MAX6642ATT90-T 0C to +150C AFC 2200pF MAX6642 MAX6642ATT92-T 0C to +150C AFD SDA DATA DXP MAX6642ATT94-T 0C to +150C AFE SCLK MAX6642ATT96-T 0C to +150C AFF CLOCK MAX6642ATT98-T 0C to +150C AEW ALERT INTERRUPT TO P MAX6642ATT9A-T 0C to +150C AFG GND P MAX6642ATT9C-T 0C to +150C AFH MAX6642ATT9E-T 0C to +150C AFI SMBus is a trademark of Intel Corp. 19-2920 Rev 5 11/151C, SMBus-Compatible Remote/ MAX6642 Local Temperature Sensor with Overtemperature Alarm Absolute Maximum Ratings All Voltages Referenced to GND ESD Protection (all pins, Human Body Model)................2000V V ...........................................................................-0.3V to +6V Junction Temperature......................................................+150C CC DXP.............................................................-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C CC SCLK, SDA, ALERT ..................................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C SDA, ALERT Current...........................................-1mA to +50mA Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) A 6-Pin TDFN (derate 24.4mW/C above +70C) .........1951mW 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 (V = +3.0V to +5.5V, T = -40C to +125C, unless otherwise specified. Typical values are at V = +3.3V and T = +25C.) (Note 1) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.0 5.5 V CC 0.25 C Temperature Resolution 10 Bits T = +60C to +100C, RJ -1.0 +1.0 T = +25C to +85C A Remote Temperature Error V = 3.3V C CC T = 0C to +125C -3.0 +3.0 RJ T = +125C to +150C -3.5 +3.5 RJ T = +60C to +100C -2.0 +2.0 A Local Temperature Error V = 3.3V C CC T = 0C to +125C -3.0 +3.0 A Supply Sensitivity of Temperature 0.2 C/V Error Undervoltage Lockout Threshold UVLO Falling edge of V disables ADC 2.4 2.7 2.95 V CC Undervoltage Lockout Hysteresis 90 mV Power-On-Reset (POR) Threshold V falling edge 1.5 2.0 2.4 V CC POR Threshold Hysteresis 90 mV Standby Supply Current SMBus static 3 10 A Operating Current During conversion 0.5 1.0 mA Average Operating Current 260 A Conversion Time t From stop bit to conversion completion 106 125 143 ms CONV Conversion Rate f 8Hz CONV High level 80 100 120 Remote-Diode Source Current I A RJ Low level 8 10 12 ALERT V = 0.4V 1 OL Output-Low Sink Current mA V = 0.6V 4 OL Output-High Leakage Current V = V 1A OH CC www.maximintegrated.com Maxim Integrated 2