MAX6697 19-3477 Rev 3 5/09 7-Channel Precision Temperature Monitor General Description Features The MAX6697 precision multichannel temperature sen- Six Thermal-Diode Inputs sor monitors its own temperature and the temperatures Local Temperature Sensor of up to six external diode-connected transistors. All temperature channels have programmable alert thresh- 1C Remote Temperature Accuracy (+60C to olds. Channels 1, 4, 5, and 6 also have programmable +100C) overtemperature thresholds. When the measured tem- Temperature Monitoring Begins at POR for Fail- perature of a channel exceeds the respective thresh- old, a status bit is set in one of the status registers. Two Safe System Protection open-drain outputs, OVERT and ALERT, assert corre- ALERT and OVERT Outputs for Interrupts, sponding to these bits in the status register. Throttling, and Shutdown The 2-wire serial interface supports the standard system Small 20-Pin QSOP and 20-Pin TSSOP Packages management bus (SMBus) protocols: write byte, read byte, send byte, and receive byte for reading the tem- 2-Wire SMBus Interface perature data and programming the alarm thresholds. The MAX6697 is specified for an operating temperature range of -40C to +125C and is available in 20-pin Ordering Information QSOP and 20-pin TSSOP packages. PART TEMP RANGE PIN-PACKAGE Applications 20 QSOP MAX6697EP -40C to +125C Desktop Computers 20 TSSOP MAX6697UP -40C to +125C Notebook Computers *See the Slave Address section. Workstations Servers Pin Configuration appears at end of data sheet. SMBus is a trademark of Intel Corp. Typical Application Circuit CPU +3.3V DXP 4.7k EACH 1 20 DXP1 GND 2200pF 2 19 MAX6697 CLK DXN1 SMBCLK DXN 3 18 DATA DXP2 SMBDATA 2200pF INTERRUPT 4 17 DXN2 ALERT TO P 5 16 DXP3 V CC 0.1F 2200pF 6 15 DXN3 OVERT TO SYSTEM 7 14 DXP4 SHUTDOWN NC1 2200pF 8 13 GPU DXN4 NC2 DXP 9 12 DXP5 DXP6 2200pF 2200pF 10 11 DXN5 DXN6 DXN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.7-Channel Precision Temperature Monitor ABSOLUTE MAXIMUM RATINGS V , SCK, SDA, ALERT, OVERT to GND ................-0.3V to +6V 20-Pin TSSOP CC (derate 11.0mW/C above +70C)..................879.1mW(U20-2) DXP to GND..............................................-0.3V to (V + 0.3V) CC DXN to GND ........................................................-0.3V to +0.8V ESD Protection (all pins, Human Body Model)................2000V Operating Temperature Range .........................-40C to +125C SDA, ALERT, OVERT Current .............................-1mA to +50mA Junction Temperature......................................................+150C DXN Current .......................................................................1mA Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-60C to +150C A Lead Temperature (soldering, 10s) .................................+300C 20-Pin QSOP (derate 9.1mW/C above +70C) ......................727.3mW(E20-1) 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 noted. 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 Standby Supply Current I SMBus static 30 A SS Operating Current I During conversion 500 1000 A CC Channel 1 only 11 Temperature Resolution Bits Other diode channels 8 T = T = +60C to +100C -1.0 +1.0 A RJ T = T = 0C to +125C -3.0 +3.0 A RJ o Remote Temperature Accuracy V = 3.3V C CC DXN grounded, 2.5 T = T = 0C to +85C RJ A T = +60C to +100C -2.0 +2.0 A o Local Temperature Accuracy V = 3.3V C CC T = 0C to +125C -3.0 +3.0 A Supply Sensitivity of Temperature o 0.2 C/V Accuracy Resistance cancellation on 95 125 156 Remote Channel 1 Conversion t ms CONV1 Time Resistance cancellation off 190 250 312 Remote Channels 2 Through 6 t 95 125 156 ms CONV Conversion Time High level 80 100 120 Remote-Diode Source Current I A RJ Low level 8 10 12 Undervoltage-Lockout Threshold UVLO Falling edge of V disables ADC 2.30 2.80 2.95 V CC Undervoltage-Lockout Hysteresis 90 mV Power-On Reset (POR) Threshold V falling edge 1.2 2.0 2.5 V CC POR Threshold Hysteresis 90 mV ALERT, OVERT I = 1mA 0.3 SINK Output Low Voltage V V OL I = 6mA 0.5 SINK Output Leakage Current 1A 2 MAX6697