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Part: MAX1805
Category:
Sensors
-> Temperature Sensors
Description: Multichannel Remote/local Temperature Sensor
Company: Maxim Integrated Products
Datasheet: Download MAX1805 datasheet File size : 750 kB
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Datasheet text preview:
19-1766; Rev 2; 5/03
Multichannel Remote/Local Temperature Sensors
________________General Description
The MAX1668/MAX1805/MAX1989 are precise multichannel digital thermometers that report the temperature of all remote sensors and their own packages. The remote sensors are diode-connected transistors--typically low-cost, easily mounted 2N3904 NPN types--that r e p l a c e conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channels can also measure the die temperature of other ICs, s u c h as microprocessors, that contain an on-chip, diode-connected transistor. The 2-wire serial interface accepts standard system management bus (SMBusTM) write byte, read byte, send byte, and receive byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1°C, in two's-complement format. T h e MAX1668/MAX1805/MAX1989 are available in s m a l l , 16-pin QSOP surface-mount packages. The MAX1989 is also available in a 16-pin TSSOP.
____________________________Features
o Multichannel 4 Remote, 1 Local (MAX1668/MAX1989) 2 Remote, 1 Local (MAX1805) o No Calibration Required o SMBus 2-Wire Serial Interface o Programmable Under/Overtemperature Alarms o Supports SMBus Alert Response o Accuracy ±2°C (+60°C to +100°C, Local) ±3°C (-40°C to +125°C, Local) ±3°C (+60°C to +100°C, Remote) o 3µA (typ) Standby Supply Current o 700µA (max) Supply Current o Small, 16-Pin QSOP/TSSOP Packages
MAX1668/MAX1805/MAX1989
_______________Ordering Information ________________________Applications
Desktop and Notebook Computers LAN Servers Industrial Controls Central-Office Telecom Equipment Test and Measurement Multichip Modules
PART MAX1668MEE MAX1805MEE MAX1989MEE MAX1989MUE TEMP RANGE -55°C to +125°C -55°C to +125°C -55°C to +125°C -55°C to +125°C PIN-PACKAGE 16 QSOP 16 QSOP 16 QSOP 16 TSSOP
Pin Configuration
TOP VIEW
DXP1 1 DXN1 2 DXP2 3 DXN2 4 (N.C.) DXP3 5 (N.C.) DXN3 6 (N.C.) DXP4 7 (N.C.) DXN4 8 16 GND 15 STBY 14 SMBCLK
Typical Operating Circuit
0.1µF 3V TO 5.5V 200 VCC STBY 10k EACH
MAX1668 MAX1805 MAX1989
MAX1668 MAX1805 MAX1989
13 SMBDATA 12 ALERT 11 ADD0 10 ADD1 9 VCC
DXP1 2200pF
SMBCLK SMBDATA ALERT
CLOCK DATA INTERRUPT TO µC
*
DXN1
DXP4 2200pF
*
DXN4 ADD0 ADD1 GND
QSOP/TSSOP
( ) ARE FOR MAX1805.
* DIODE-CONNECTED TRANSISTOR
Patents Pending 1
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Multichannel Remote/Local Temperature Sensors MAX1668/MAX1805/MAX1989
ABSOLUTE MAXIMUM RATINGS
VCC to GND .....-0.3V to +6V DXP_, ADD_, STBY to GND......-0.3V to (VCC + 0.3V) DXN_ to GND ........-0.3V to +0.8V SMBCLK, SMBDATA, ALERT to GND ....-0.3V to +6V SMBDATA, ALERT Current .........-1mA to +50mA DXN_ Current....±1mA Continuous Power Dissipation (TA = +70°C) QSOP (derate 8.30mW/°C above +70°C) ...........667mW TSSOP (derate 9.40mW/°C above +70°C) .........755mW Operating Temperature Range .......-55°C to +125°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
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
(VCC = +3.3V, STBY = VCC, configuration byte = X0XXXX00, TA = 0°C to +125°C, unless otherwise noted.) PARAMETER ADC AND POWER SUPPLY Temperature Resolution (Note 1) Initial Temperature Error, Local Diode (Note 2) Temperature Error, Remote Diode (Notes 2, 3) Temperature Error, Local Diode (Notes 1, 2) Supply Voltage Range Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Power-On Reset (POR) Threshold POR Threshold Hysteresis Logic inputs forced to VCC or GND SMBus static Hardware or software standby, SMBCLK at 10kHz VCC, falling edge 1.3 VCC input, disables A/D conversion, rising edge Monotonicity guaranteed TA = +60°C to +100°C TA = 0°C to +125°C TR = +60°C to +100°C TR = -55°C to +125°C Including long-term drift TA = +60°C to +100°C TA = 0°C to +85°C 8 -2 -3 -3 -5 -2.5 -3.5 3.0 2.60 2.8 50 1.8 50 3 5 400 260 70 7 320 100 10 200 50 0.7 ADD0, ADD1; momentary upon power-on reset 160 V µA 10 µA 12 700 380 130 13 µA µA ms 2.3 +2 +3 +3 +5 +2.5 +3.5 5.5 2.95 Bits °C °C °C V V mV V mV CONDITIONS MIN TYP MAX UNITS
Standby Supply Current
Average Operating Supply Current Conversion Time
Average measured over 4s; logic inputs forced VCC or GND From stop bit to conversion complete (all channels) High level (POR state) Low level (POR state) Configuration byte = X0XXXX10, high level Configuration byte = X0XXXX01, high level
Remote-Diode Source Current
DXP_ forced to 1.5V
DXN_ Source Voltage Address Pin Bias Current
2
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Multichannel Remote/Local Temperature Sensors
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.3V, STBY = VCC, configuration byte = X0XXXX00, TA = 0°C to +125°C, unless otherwise noted.) PARAMETER SMBus INTERFACE Logic Input High Voltage Logic Input Low Voltage Logic Output Low Sink Current ALERT Output High Leakage Current Logic Input Current SMBus Input Capacitance SMBus Clock Frequency SMBCLK Clock Low Time SMBCLK Clock High Time SMBus Start-Condition Setup Time SMBus Repeated Start-Condition Setup Time SMBus Start-Condition Hold Time SMBus Stop-Condition Setup Time SMBus Data Valid to SMBCLK Rising-Edge Time SMBus Data-Hold Time SMBCLK Falling Edge to SMBus Data-Valid Time tSU:STA, 90% to 90% points tHD:STA, 10% of SMBDATA to 90% of SMBCLK tSU:STO, 90% of SMBCLK to 10% of SMBDATA tSU:DAT, 10% or 90% of SMBDATA to 10% of SMBCLK tHD:DAT, slave receive (Note 5) Master clocking in data STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V ALERT, SMBDATA forced to 0.4V ALERT forced to 5.5V Logic inputs forced to VCC or GND SMBCLK, SMBDATA (Note 4) tLOW, 10% to 10% points tHIGH, 90% to 90% points DC 4.7 4 4.7 250 4 4 250 0 1 -1 5 100 6 1 +1 2.2 0.8 V V mA µA µA pF kHz µs µs µs ns µs µs ns ns µs CONDITIONS MIN TYP MAX UNITS
MAX1668/MAX1805/MAX1989
ELECTRICAL CHARACTERISTICS
(VCC = +5V, STBY = VCC, configuration byte = X0XXXX00, TA = -55°C to +125°C, unless otherwise noted.) (Note 6) PARAMETER ADC AND POWER SUPPLY Temperature Resolution Initial Temperature Error, Local Diode (Note 2) Temperature Error, Remote Diode (Notes 2, 3) Supply-Voltage Range Conversion Time From stop bit to conversion complete (both channels) Monotonicity guaranteed TA = +60°C to +100°C TA = -55°C to +125°C TR = +60°C to +100°C TR = -55°C to +125°C 8 -2 -3 -3 -5 4.5 260 +2 +3 +3 +5 5.5 380 Bits °C °C V ms CONDITIONS MIN TYP MAX UNITS
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