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Numéro de sérieMAX7503
CategorieSensors => Temperature Sensors
DescriptionDigital Temperature Sensors And Thermal Watchdog With Bus Lockup Protection
The MAX7500–MAX7504 temperature sensors accurately measure temperature and provide an overtemperature alarm/interrupt/shutdown output. These devices convert the temperature measurements to digital form using a high-resolution, sigma-delta, analog-todigital converter (ADC). Communication is through an I²C-compatible 2-wire serial interface. The MAX7500/MAX7501/MAX7502 integrate a timeout feature that offers protection against I²C bus lockups. The MAX7503/MAX7504 do not include the timeout feature
SociétéMaxim Integrated Products
DatasheetTélécharger MAX7503 datasheet
 
 
  • Description courte

  • Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection

    The MAX7500­MAX7504 temperature sensors accurately measure temperature and provide an overtemperature alarm/interrupt/shutdown output. These devices convert the temperature measurements to digital form using a high-resolution, sigma-delta, analog-todigital converter (ADC). Communication is through I2C-compatible 2-wire serial interface. The MAX7500/ MAX7501/MAX7502 integrate a timeout feature that offers protection against 2 C bus lockups. The MAX7503/MAX7504 do not include the timeout feature. The 2-wire serial interface accepts standard write byte, read byte, send byte, and receive byte commands to read the temperature data and configure the behavior of the open-drain overtemperature shutdown output. The MAX7500 features three address select lines, while the MAX7501­MAX7504 feature two address select lines and a RESET input. The to 5.5V supply voltage range, low 250µA supply current, and a lockup-protected I2C-compatible interface make them ideal for a wide range of applications, including personal computers (PCs), electronic test equipment, and office electronics. The MAX7500­MAX7504 are available in 8-pin µMAX® and SO packages and operate over the to +125°C temperature range.

    Features

    Timeout Prevents Bus Lockup MAX7501, MAX7502) Hardware Reset for Added Protection I2C Bus Interface to 5.5V Supply Voltage Range 250µA (typ) Operating Supply Current

    3µA (typ) Shutdown Supply Current ±1.5°C (max) Temperature Accuracy +100°C, 3-) µMAX, SO Packages Save Space Separate Open-Drain OS Output Operates as Interrupt or Comparator/Thermostat Input Register Readback Capability Improved LM75 Second Source UL Certified

    PART MAX7500MSA TEMP PINRESET RANGE PACKAGE +125°C X TIMEOUT X
    Applications
    PCs Servers Office Electronics Electronic Test Equipment Industrial Process Control

    Ordering Information/Selector Guide continued at end of data sheet. Pin Configurations appear at end of data sheet.

    µMAX is a registered trademark of Maxim Integrated Products, Inc.

    For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.

    Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection MAX7500­MAX7504

    (Note 1) +VS to GND............................................................. to +6V OS, SDA, SCL to GND.......................................... to +6.0V All Other Pins to GND................................ -0.3V to (+VS + 0.3V) Input Current at Any Pin (Note 2)..................................... +5mA Package Input Current (Note 2)..................................... +20mA ESD Protection (all pins, Human Body Model, Note 3)... ±2000V Continuous Power Dissipation (TA +70°C) 8-Pin µMAX (derate 4.5mW/°C above 8-Pin SO (derate 5.9mW/°C above +70°C)................. 471mW Operating Temperature Range....................... to +125°C Junction Temperature.................................................... +150°C Storage Temperature Range........................... to +150°C Lead Temperature (soldering, 10s)............................... +300°C

    Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: When the input voltage (VI) at any pin exceeds the power supplies (VI < VGND > + VS), the current at that pin should be limited to 5mA. The 20mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current to 4. Note 3: Human Body Model, 100pF discharged through a 1.5k resistor.

    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.

    (+VS to +125°C, unless otherwise noted. Typical values are at +VS = +25°C.) (Notes 4, 5)

    PARAMETER Accuracy, 6- Accuracy, 3- (Note 5) Resolution Conversion Time Quiescent Supply Current +VS Supply Voltage Range OS Output Saturation Voltage OS Delay TOS Default Temperature THYST Default Temperature LOGIC (SDA, SCL, A1, A2) Input High Voltage Input Low Voltage Input High Current Input Low Current Input Capacitance Output High Current Output Low Voltage VIH VIL IIH IIL VIN = 5V VIN = 0V All digital inputs VIN = 5V IOL = 3mA +VS x 0.7 +VS µA V IOUT = 4.0mA (Note 7) (Note 8) (Note 9) (Note 6) I2C inactive Shutdown mode, +VS = 3V Shutdown mode, +VS 5V 3.0 SYMBOL CONDITIONS TA +125°C MIN -1.5°C -2.0°C TYP MAX +1.5°C +2.0°C UNITS

    (+VS to +125°C, unless otherwise noted. Typical values are at +VS = +25°C.) (Notes 4, 5)

    PARAMETER SYMBOL I2C-COMPATIBLE TIMING (Note 10) Serial Clock Frequency Minimum RESET Pulse Width Bus Free Time Between STOP and START Conditions START Condition Hold Time STOP Condition Setup Time Clock Low Period Clock High Period START Condition Setup Time Data Setup Time Data Hold Time Maximum Receive SCL/SDA Rise Time Minimum Receive SCL/SDA Rise Time Maximum Receive SCL/SDA Fall Time Minimum Receive SCL/SDA Fall Time Transmit SDA Fall Time Pulse Width of Suppressed Spike SDA Time Low for Reset of Serial Interface fSCL CONDITIONS Bus timeout inactive MIN DC 1 tBUF tHD:STA tSU:STO tLOW tHIGH tSU:STA tSU:DAT tHD:DAT 90% of SCL 90% of SDA 10% of SDA 10% of SCL 10% of SCL 10% of SDA (Note 90% of SCL 10% of SDA x CB TYP MAX 400 UNITS kHz µs ns

    Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Note 13: Note 14:

    All parameters are measured at +25°C. Values over the temperature range are guaranteed by design. There are no industry-wide standards for temperature accuracy specifications. These values allow comparison to vendors who use 3- limits. This specification indicates how often temperature data is updated. The devices can be read at any time without regard to conversion state, while yielding the last conversion result. For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy due to internal heating. OS delay is user programmable up to six "over-limit" conversions before OS is set to minimize false tripping in noisy environments. Default values set at power-up. All timing specifications are guaranteed by design. A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL's falling edge. CB = total capacitance of one bus line in pF. Tested with = 400pF. Input filters on SDA, SCL, and A_ suppress noise spikes less than 50ns. Holding the SDA line low for a time greater than tTIMEOUT causes the devices to reset SDA to the IDLE state of the serial bus communication (SDA set high).