MAX1617 19-1265 Rev 1 3/98 Remote/Local Temperature Sensor with SMBus Serial Interface General Description Features The MAX1617 (patents pending) is a precise digital Two Channels: Measures Both Remote and Local thermometer that reports the temperature of both a Temperatures remote sensor and its own package. The remote sensor No Calibration Required is a diode-connected transistortypically a low-cost, easily mounted 2N3904 NPN typethat replaces con- SMBus 2-Wire Serial Interface ventional thermistors or thermocouples. Remote accu- Programmable Under/Overtemperature Alarms racy is 3C for multiple transistor manufacturers, with no calibration needed. The remote channel can also Supports SMBus Alert Response measure the die temperature of other ICs, such as Accuracy: microprocessors, that contain an on-chip, diode-con- nected transistor. 2C (+60C to +100C, local) 3C (-40C to +125C, local) The 2-wire serial interface accepts standard System 3C (+60C to +100C, remote) Management Bus (SMBus) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the 3A (typ) Standby Supply Current alarm thresholds and to read temperature data. The data 70A (max) Supply Current in Auto-Convert Mode format is 7 bits plus sign, with each bit corresponding to 1C, in twos-complement format. Measurements can be +3V to +5.5V Supply Range done automatically and autonomously, with the conver- Small, 16-Pin QSOP Package sion rate programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to control the supply-current drain. The MAX1617 is available in a small, 16-pin QSOP sur- face-mount package. Ordering Information PART* TEMP. RANGE PIN-PACKAGE Applications MAX1617MEE -55C to +125C 16 QSOP Desktop and Notebook Central Office *U.S. and foreign patents pending. Computers Telecom Equipment Smart Battery Packs Test and Measurement LAN Servers Multi-Chip Modules Industrial Controls Pin Configuration Typical Operating Circuit 3V TO 5.5V 0.1F TOP VIEW 200 N.C. 1 16 N.C. V STBY CC V 2 15 STBY CC 10k EACH DXP 3 14 SMBCLK MAX1617 DXP DXN 4 MAX1617 13 N.C. CLOCK SMBCLK N.C. 5 12 SMBDATA DATA SMBDATA ADD1 6 11 ALERT DXN ALERT INTERRUPT 2N3904 2200pF TO C GND 7 10 ADD0 ADD0 ADD1 GND GND 8 9 N.C. QSOP SMBus is a trademark of Intel Corp. Patents Pending Maxim Integrated Products 1 For free samples & the latest literature: Remote/Local Temperature Sensor with SMBus Serial Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC A DXP, ADD to GND ....................................-0.3V to (V + 0.3V) QSOP (derate 8.30mW/C above +70C).....................667mW CC DXN to GND ..........................................................-0.3V to +0.8V Operating Temperature Range .........................-55C to +125C SMBCLK, SMBDATA, ALERT, STBY to GND ...........-0.3V to +6V Junction Temperature......................................................+150C SMBDATA, ALERT Current .................................-1mA to +50mA Storage Temperature Range .............................-65C to +165C DXN Current .......................................................................1mA Lead Temperature (soldering, 10sec) .............................+300C ESD Protection (SMBCLK, SMBDATA, ALERT, human body model).......................................... 4000V ESD Protection (other pins, human body model)...............2000V 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 = +3.3V, T = 0C to +85C, unless otherwise noted.) CC A PARAMETER CONDITIONS MIN TYP MAX UNITS ADC AND POWER SUPPLY Temperature Resolution (Note 1) Monotonicity guaranteed 8 Bits T = +60C to +100C -2 2 Initial Temperature Error, A C Local Diode (Note 2) T = 0C to +85C -3 3 A T = +60C to +100C -3 3 R Temperature Error, Remote Diode C (Notes 2 and 3) T = -55C to +125C -5 5 R T = +60C to +100C -2.5 2.5 Temperature Error, Local Diode A Including long-term drift C (Notes 1 and 2) T = 0C to +85C -3.5 3.5 A Supply-Voltage Range 3.0 5.5 V Undervoltage Lockout Threshold V input, disables A/D conversion, rising edge 2.60 2.80 2.95 V CC Undervoltage Lockout Hysteresis 50 mV Power-On Reset Threshold V , falling edge 1.0 1.7 2.5 V CC POR Threshold Hysteresis 50 mV SMBus static 3 10 Logic inputs Standby Supply Current forced to V A CC Hardware or software standby, SMB- or GND 4 CLK at 10kHz Auto-convert mode, average 0.25 conv/sec 35 70 Average Operating Supply Current measured over 4sec. Logic A inputs forced to V or GND. 2.0 conv/sec 120 180 CC Conversion Time From stop bit to conversion complete (both channels) 94 125 156 ms Conversion Rate Timing Error Auto-convert mode -25 25 % High level 80 100 120 Remote-Diode Source Current DXP forced to 1.5V A Low level 8 10 12 DXN Source Voltage 0.7 V Address Pin Bias Current ADD0, ADD1 momentary upon power-on reset 160 A 2 MAX1617