MAX1619 19-1483 Rev 0 4/99 Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface General Description Features The MAX1619 is a precise digital thermometer that reports Two Channels Measure Both Remote and Local the temperature of both a remote sensor and its own Temperatures package. The remote sensor is a diode-connected transis- No Calibration Required tortypically a low-cost, easily mounted 2N3904 NPN typethat replaces conventional thermistors or thermo- SMBus 2-Wire Serial Interface couples. Remote accuracy is 3C for multiple transistor Programmable Under/Overtemperature Alarms manufacturers, with no calibration needed. The remote channel can also measure the die temperature of other OVERT Output for Fan Control ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. Supports SMBus Alert Response The 2-wire serial interface accepts standard System Supports Manufacturer and Device ID Codes Management Bus (SMBus ) Write Byte, Read Byte, Send Accuracy Byte, and Receive Byte commands to program the alarm 2C (+60C to +100C, local) thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1C, in 3C (-40C to +125C, local) twos complement format. Measurements can be done 3C (+60C to +100C, remote) automatically and autonomously, with the conversion rate 3A (typ) Standby Supply Current programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to 70A (max) Supply Current in Auto-Convert Mode control the supply-current drain. +3V to +5.5V Supply Range The MAX1619 is nearly identical to the popular MAX1617A, Write-Once Protection with the additional feature of an overtemperature alarm out- put (OVERT) that responds to the remote temperature this Small 16-Pin QSOP Package is optimal for fan control. Ordering Information Applications PART TEMP. RANGE PIN-PACKAGE Desktop and Notebook Central Office Computers Telecom Equipment MAX1619MEE -55C to +125C 16 QSOP Smart Battery Packs Test and Measurement Typical Operating Circuit LAN Servers Multichip Modules Industrial Controls +3V TO +5.5V 0.1F 200 Pin Configuration V STBY TOP VIEW CC 10k EACH V 1 16 N.C. CC MAX1619 GND 2 15 STBY DXP SMBCLK CLOCK DXP 3 14 SMBCLK DATA SMBDATA DXN 4 MAX1619 13 N.C. INTERRUPT DXN N.C. 5 12 SMBDATA ALERT 2N3904 2200pF TO C FAN ADD1 6 11 ALERT OVERT CONTROL GND 7 10 ADD0 ADD0 ADD1 GND GND 8 9 OVERT QSOP SMBus is a registered trademark of Intel Corp. Maxim Integrated Products 1 For free samples & the latest literature: Remote/Local Temperature Sensor with Dual- Alarm Outputs and 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, OVERT, Junction Temperature......................................................+150C STBY to GND............................................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C SMBDATA, ALERT, OVERT Current....................-1mA to +50mA Lead Temperature (soldering, 10sec) .............................+300C DXN Current .......................................................................1mA ESD Protection (all 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, configuration byte = XCh, 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 A Initial Temperature Error, C Local Diode (Note 2) T = 0C to +85C -3 3 A T = +60C to +100C -3 3 Temperature Error, Remote Diode R C (Notes 2, 3) T = -55C to +125C (Note 4) -5 5 R T = +60C to +100C -2.5 2.5 Temperature Error, Local Diode A Including long-term drift C (Notes 1, 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 310 Logic inputs Standby Supply Current forced to V A CC Hardware or software standby, or GND 5 SMBCLK at 10kHz Autoconvert 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 810 12 DXN Source Voltage 0.7 V Address Pin Bias Current ADD0, ADD1 momentary upon power-on reset 160 A 2 MAX1619