MAX1668/MAX1805/MAX1989 19-1766 Rev 2 5/03 Multichannel Remote/Local Temperature Sensors General Description Features The MAX1668/MAX1805/MAX1989 are precise multi- Multichannel channel digital thermometers that report the tempera- 4 Remote, 1 Local (MAX1668/MAX1989) ture of all remote sensors and their own packages. The 2 Remote, 1 Local (MAX1805) remote sensors are diode-connected transistorstypi- No Calibration Required cally low-cost, easily mounted 2N3904 NPN typesthat replace conventional thermistors or thermocouples. SMBus 2-Wire Serial Interface Remote accuracy is 3C for multiple transistor manu- Programmable Under/Overtemperature Alarms facturers, with no calibration needed. The remote chan- nels can also measure the die temperature of other ICs, Supports SMBus Alert Response such as microprocessors, that contain an on-chip, Accuracy 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 thresholds and to read temperature data. The data for- 3A (typ) Standby Supply Current mat is 7 bits plus sign, with each bit corresponding to 700A (max) Supply Current 1C, in twos-complement format. The MAX1668/MAX1805/MAX1989 are available in Small, 16-Pin QSOP/TSSOP Packages small, 16-pin QSOP surface-mount packages. The MAX1989 is also available in a 16-pin TSSOP. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE MAX1668MEE -55C to +125C 16 QSOP Desktop and Notebook Central-Office Telecom Computers Equipment MAX1805MEE -55C to +125C 16 QSOP MAX1989MEE -55C to +125C 16 QSOP LAN Servers Test and Measurement MAX1989MUE -55C to +125C 16 TSSOP Industrial Controls Multichip Modules Pin Configuration Typical Operating Circuit 3V TO 5.5V 0.1F 200 TOP VIEW DXP1 1 16 GND V CC STBY 10k EACH DXN1 2 15 STBY MAX1668 MAX1805 DXP2 3 14 SMBCLK MAX1989 DXP1 CLOCK SMBCLK DXN2 4 MAX1668 13 SMBDATA 2200pF MAX1805 DATA SMBDATA (N.C.) DXP3 5 12 ALERT * DXN1 MAX1989 INTERRUPT ALERT (N.C.) DXN3 6 11 ADD0 TO C (N.C.) DXP4 7 10 ADD1 DXP4 2200pF (N.C.) DXN4 8 9 V CC DXN4 * ADD0 ADD1 GND QSOP/TSSOP ( ) ARE FOR MAX1805. * DIODE-CONNECTED TRANSISTOR SMBus is a trademark of Intel Corp. Pg Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Multichannel Remote/Local Temperature Sensors ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Operating Temperature Range .........................-55C to +125C CC DXP , ADD , STBY to GND........................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC DXN to GND ........................................................-0.3V to +0.8V Storage Temperature Range .............................-65C to +150C SMBCLK, SMBDATA, ALERT to GND......................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C SMBDATA, ALERT Current .................................-1mA to +50mA DXN Current......................................................................1mA Continuous Power Dissipation (T = +70C) A QSOP (derate 8.30mW/C above +70C)....................667mW TSSOP (derate 9.40mW/C above +70C) ..................755mW 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, STBY = V , configuration byte = X0XXXX00, T = 0C to +125C, unless otherwise noted.) CC A CC 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 +125C -3 +3 A T = +60C to +100C -3 +3 Temperature Error, Remote Diode R C (Notes 2, 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, 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 2.8 2.95 V CC Undervoltage Lockout Hysteresis 50 mV Power-On Reset (POR) Threshold V , falling edge 1.3 1.8 2.3 V CC POR Threshold Hysteresis 50 mV Logic inputs SMBus static 310 Standby Supply Current forced to V A CC Hardware or software standby, or GND 512 SMBCLK at 10kHz Average measured over 4s logic inputs forced Average Operating Supply Current 400 700 A V or GND CC Conversion Time From stop bit to conversion complete (all channels) 260 320 380 ms High level (POR state) 70 100 130 Low level (POR state) 710 13 Configuration byte = Remote-Diode Source Current DXP forced to 1.5V 200 A X0XXXX10, high level Configuration byte = 50 X0XXXX01, high level DXN Source Voltage 0.7 V Address Pin Bias Current ADD0, ADD1 momentary upon power-on reset 160 A 2 MAX1668/MAX1805/MAX1989