EVALUATION KIT AVAILABLE MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface General Description Features The MAX1617A is a precise digital thermometer that Two Channels: Measures Both Remote and Local reports the temperature of both a remote sensor and its Temperatures own package. The remote sensor is a diode-connected No Calibration Required transistortypically a low-cost, easily mounted 2N3904 SMBus 2-Wire Serial Interface NPN typethat replaces conventional thermistors or Programmable Under/Overtemperature Alarms thermocouples. Remote accuracy is 3C for multiple transistor manufacturers, with no calibration needed. The Supports SMBus Alert Response remote channel can also measure the die temperature of Supports Manufacturer and Device ID Codes other ICs, such as microprocessors, that contain an on- Accuracy chip, diode-connected transistor. 2C (+60C to +100C, local) The 2-wire serial interface accepts standard System 3C (-40C to +125C, local) Management Bus (SMBus) Write Byte, Read Byte, Send 3C (+60C to +100C, remote) Byte, and Receive Byte commands to program the alarm 3A (typ) Standby Supply Current thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1C, in 70A (max) Supply Current in Auto-Convert Mode twos complement format. Measurements can be done +3V to +5.5V Supply Range automatically and autonomously, with the conversion rate Small 16-Pin QSOP Package 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. Ordering Information The MAX1617A is nearly identical to the popular PART PIN-PACKAGE PIN-PACKAGE MAX1617, but has improved SMBus timing specifications, improved bus collision immunity, software manufacturer MAX1617AMEE+ -55C to +125C 16 QSOP and device identification available via the serial interface, +Denotes a lead(Pb)-free/RoHS-compliant package. and a power-on reset function that can force a reset of the slave address via the serial interface. Applications Desktop and Notebook Central Office Typical Operating Circuit Computers Telecom Equipment Smart Battery Packs Test and Measurement 3V TO 5.5V LAN Servers Multichip Modules 0.1F Industrial Controls V STBY CC Pin Configuration 10k EACH MAX1617A TOP VIEW + N.C. 1 16 N.C. DXP SMBCLK CLOCK V 2 15 STBY CC DATA SMBDATA DXP 3 14 SMBCLK DXN 4 MAX1617A 13 N.C. DXN ALERT INTERRUPT 2N3904 2200pF TO C N.C. 5 12 SMBDATA ADD0 ADD1 GND ADD1 6 11 ALERT GND 7 10 ADD0 GND 9 N.C. 8 QSOP 19-4508 Rev 2 11/16MAX1617A 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, Soldering Temperature (reflow) .......................................+260C 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.) (Note 1) CC A PARAMETER CONDITIONS MIN TYP MAX UNITS ADC AND POWER SUPPLY Temperature Resolution (Note 2) Monotonicity guaranteed 8 Bits T = +60C to +100C -2 2 Initial Temperature Error, A C Local Diode (Note 3) T = 0C to +85C -3 3 A T = +60C to +100C -3 3 Temperature Error, Remote Diode R C (Notes 3 and 4) 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 2 and 3) 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 forced to Hardware or software Standby Supply Current A V or GND CC standby, SMBCLK at 4 10kHz Auto-convert mode, 0.25 conv/sec 35 70 average measured over Average Operating Supply Current A 4sec. Logic inputs forced 2.0 conv/sec 120 180 to V or GND. CC From stop bit to conversion complete Conversion Time 94 125 156 ms (both channels) 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 Maxim Integrated 2 www.maximintegrated.com