MAX30205 MAXIM | Alldatasheet

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Ordering Information appears at end of data sheet. General Description The MAX30205 temperature sensor accurately measures temperature and provide an overtemperature alarm/ interrupt/shutdown output. This device converts the temperature measurements to digital form using a high- resolution, sigma-delta, analog-to-digital converter (ADC). Accuracy meets clinical thermometry specification of the ASTM E1112 when soldered on the final PCB. Communication is through an I 2C-compatible, 2-wire serial interface. The I2C 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 MAX30205 features three address select lines with a total of 32 available addresses. The sensor has a 2.7V to 3.3V supply voltage range, low 600µA supply current, and a lockup-protected I 2C-compatible interface that make it ideal for wearable fitness and medical applications. This device is available in an 8-pin TDFN package and operates over the 0NC to +50NC temperature range.

Applications

  • Fitness
  • Medical Benefits and Features
  • High Accuracy and Low-Voltage Operation Aids Designers in Meeting Error and Power Budgets
  • 0.1°C Accuracy (37°C to 39°C)
  • 16-Bit (0.00390625°C) Temperature Resolution
  • 2.7V to 3.3V Supply Voltage Range
  • One-Shot and Shutdown Modes Help Reduce Power Usage
  • 600μA (typ) Operating Supply Current
  • Digital Functions Make Integration Easier into Any System
  • Selectable Timeout Prevents Bus Lockup
  • Separate Open-Drain OS Output Operates as Interrupt or Comparator/Thermostat Output 19-8505; Rev 0; 3/16 MAX30205 VDD 0.1µF +2.7V TO +3.3V 4.7kΩ SDATO I2C MASTER SCL OS GND Typical Application Circuit MAX30205 Human Body Temperature Sensor

Note 1: Human Body Model, 100pF discharged through a 1.5k I resistor. (All voltages relative to GND.) Continuous Power Dissipation (TA = +70°C) ESD Protection (All Pins, Human Body Model) (Note 1) ... ±4000V (TA = 0°C to +50°C, unless otherwise noted.) (Notes 3, 4) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage VDD 2.7 3.0 3.3 V Input High Voltage VIH VDD x 0.7 V Input Low Voltage VIL VDD x 0.3 V PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Thermometer Error (Note 5) TERR ADC Repeatability Trepeat 1 Sigma 0.009 °C Temperature Data Resolution 16 Bits Conversion Time 44 50 ms First Conversion Completed Data ready after POR 50 ms Package Thermal Characteristics (Note 2) Absolute Maximum Ratings Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. 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. Recommended Operating Conditions

Electrical Characteristics

www.maximintegrated.com Maxim Integrated │ 2 MAX30205 Human Body Temperature Sensor

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Quiescent Supply Current IDD I2C inactive, TA = 0°C to +50°C 600 925 µAShutdown mode, I2C inactive, TA = 0°C to +50°C 1.65 3.5 OS Delay Depends on fault queue setting 1 6 Conversions TOS Default Temperature Factory default setting 80 °C THYST Default Temperature Factory default setting 75 °C POR Voltage Threshold 2.26 V POR Hysteresis 130 mV Input-High Leakage Current IIH VIN = 3.3V (all digital inputs) 0.005 1 µA Input-Low Leakage Current IIL VIN = 0V (all digital inputs ) 0.005 1 µA Input Capacitance All digital inputs 5 pF Output-High Leakage Current VIN = 3.3V (SDA and OS) 1 µA OS Output Saturation Voltage IOUT = 4.0mA 0.8 V Output Low Voltage IOL = 3mA (SDA) 0.4 V PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Serial Clock Frequency fSCL (Note 7) DC 400 kHz Bus Free Time Between STOP and START Conditions tBUF 1.3 Fs START Condition Hold Time tHD:STA 0.6 Fs STOP Condition Setup Time tSU:STO 90% of SCL to 10% of SDA 600 ns Clock Low Period tLOW 1.3 Fs Clock High Period tHIGH 0.6 Fs START Condition Setup Time tSU:STA 90% of SCL to 90% of SDA 100 ns Data Setup Time tSU:DAT 10% of SDA to 10% of SCL 100 ns Data Out Hold Time tDH (Note 8) 100 ns Data In Hold Time tHD:DAT 10% of SCL to 10% of SDA (Note 8) 0 0.9 Fs Maximum Receive SCL/SDA Rise Time tR (Note 9) 300 ns Minimum Receive SCL/SDA Rise Time tR (Note 9) 20 + 0.1CB ns Maximum Receive SCL/SDA Fall Time tF (Note 9) 300 ns Minimum Receive SCL/SDA Fall Time tF (Note 9) 20 + 0.1CB ns Electrical Characteristics (continued) www.maximintegrated.com Maxim Integrated │ 3 MAX30205 Human Body Temperature Sensor

range are guaranteed by design and characterization. Typical values are not guaranteed. Note 4: All voltages are referenced to ground. Currents entering the IC are specified positive. dered down on the PCB. Sample period > 10s to eliminate self-heating effects. Note 6: All timing specifications are guaranteed by design. bus communication (SDA released). Note 9: CB = total capacitance of one bus line in pF. Tested with CB = 400pF. Note 10: Input filters on SDA and SCL suppress noise spikes less than 50ns. Figure 1. I2C Timing Diagram NOTE: TIMING IS REFERENCED TO VIL(MAX) AND VIH(MIN).

(TA = +25°C, unless otherwise noted.) 500 550 600 650 700 750 -10 10 30 50 IDD (μA) TEMPERATURE (ºC) STATIC QUIESCENT SUPPLY CURRENT vs. TEMPERATURE toc01 3.3V 2.7V 3.0V 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 -10 10 30 50 IDD (μA) TEMPERATURE (ºC) STATIC QUIESCENT SUPPLY CURRENT vs. TEMPERATURE (SHUTDOWN MODE) toc02 3.3V 2.7V 3.0V -0.15 -0.1 -0.05 0.05 0.1 0.15 0 20 40 60 ERROR (ºC) TEMPERATURE (ºC) ACCURACY vs. TEMPERATURE (VDD = 2.7V) toc03 +3 SIGMA ERROR -3 SIGMA ERROR MEAN ERROR -0.15 -0.1 -0.05 0.05 0.1 0.15 0 20 40 60 ERROR (ºC) TEMPERATURE (ºC) ACCURACY vs. TEMPERATURE (VDD = 3.0V) toc04 +3 SIGMA ERROR -3 SIGMA ERROR MEAN ERROR -0.15 -0.1 -0.05 0.05 0.1 0.15 0 20 40 60 ERROR (ºC) TEMPERATURE (ºC) ACCURACY vs. TEMPERATURE (VDD = 3.3V) toc05 +3 SIGMA ERROR -3 SIGMA ERROR MEAN ERROR Typical Operating Characteristics Maxim Integrated │ 5 www.maximintegrated.com MAX30205 Human Body Temperature Sensor

1 SDA Serial-Data Input/Output Line. Open-drain. Connect SDA to a pullup resistor. High impedance for supply voltages from 0 to 3.3V. 2 SCL Serial-Data Clock Input. Open-drain. Connect SCL to a pullup resistor. High impedance for supply voltages from 0 to 3.3V. 3 OS Overtemperature Shutdown Output. Open-drain. Connect OS to a pullup resistor.

4 GND Ground

5 A2 I2C Slave Address Input. Connect A2 to GND or VDD to set the desired I2C bus address. Do not leave unconnected (Table 1). 6 A1 I2C Slave Address Input. Connect A1 to GND, VDD, SDA, or SCL to set the desired I2C bus address. Do not leave unconnected (Table 1). High impedance for supply voltages from 0 to 3.3V. 7 A0 I2C Slave Address Input. Connect A0 to GND, VDD, SDA, or SCL to set the desired I2C bus address. Do not leave unconnected (Table 1). High impedance for supply voltages from 0 to 3.3V. 8 VDD Positive 3.3V Supply Voltage Input. Bypass to GND with a 0.1µF bypass capacitor. — EP Exposed Pad (Bottom-Side of Package). Connect EP to GND. 1 3 4 8 6 5 VDD A1 A2 EP SDA OS GNDSCL TDFN (3mm x 3mm) TOP VIEW MAX30205 Pin Description Pin Configuration www.maximintegrated.com Maxim Integrated │ 6 MAX30205 Human Body Temperature Sensor

26 25 24 23 22 21 20 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 STHYST MSB TEMPERATURE SENSOR 16-BIT Σ∆ ADC LSBMS BYTE MSB LSBLS BYTE 26 25 24 23 22 21 20 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 STOS 26 25 24 23 22 21 20 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 TOS REGISTER DIGITAL COMPARATOR 0 1 1 0 1 1 VDD GND VDD TEMP REGISTER THYST REGISTER THERMOSTAT LOGIC FAULT QUEUE BITS COMPARE/ INTERRUPT BIT OS POLARITY BIT OS N OS ACTIVATE ONE SHOT TIMEOUT DATA FORMAT FAULT QUEUE [1] FAULT QUEUE [2] OS POLARITY SHUTDOWN VOLTAGE REFERENCE DIGITAL CONTROL ONE-SHOT BIT SHUTDOWN BIT MAX30205 COMPARATOR/ INTERRUPT Block Diagram www.maximintegrated.com Maxim Integrated │ 7 MAX30205 Human Body Temperature Sensor

(OS) trip thresholds, and configure other characteristics. measurement upon completion of the read operation. temperature rises above the limit set in the T OS register. Figure 2. OS Output Temperature Response Diagram

and from the alarm and configuration registers. selected using the A0, A1, and A2 pins for the MAX30205. determine the slave address. Table 1. MAX30205 Slave Address Selection

read-only temperature register. valid address, additional data writes to the next address. Figure 3. I2C-Compatible Timing Diagram (Write) Table 2. Register Functions and POR State (a) CONFIGURATION REGISTER WRITE.

pointing to a valid address, additional data can be read. is read out in 2 bytes: an upper byte and a lower byte. the sign bit; see Table 3. The MSB is transmitted first. Figure 4. I2C-Compatible Timing Diagram (Read) Table 3. Temperature, THYST, and TOS Register Definition (b) TYPICAL POINTER SET FOLLOWED BY IMMEDIATE READ FOR 2-BYTE REGISTER SUCH AS TEMPERATURE, TOS, AND THYST. (a) TYPICAL POINTER SET FOLLOWED BY IMMEDIATE READ FROM CONFIGURATION REGISTER.

the OS output functions in comparator or interrupt mode. interrupt mode, entering shutdown resets the OS output. all registers remain accessible to the master. are available to read after the max conversion time. below the THYST value. See Figure 2. output a high voltage. See Figure 2. number of faults necessary to trigger an OS condition. prevents OS false tripping in noisy environments. Table 4. Temperature Data Output Format Table 5. Configuration Register Definition

a time equal to twice the max conversion time. Set D6 to 1 to disable bus timeout. SDA is low for more than 50ms (nominal). current when continuous conversions are not necessary.

  • Comparator mode
  • OS active low
  • 1 fault, fault queue
  • Normal data format
  • Timeout enabled for MAX30205 Applications Information The MAX30205 measures the temperature of its own die. The thermal path between the die and the outside world determines the accuracy of temperature measurements. External temperature is conducted to the die primarily through the leads and the exposed pad. Because of this, the device most easily measures the PCB temperature. For ambient temperature measurements, mount the device on a PCB (or a section of the PCB) that is at ambient tempera- ture. Temperature errors due to self-heating of the device die are minimal due to the low supply current. Digital Noise Issues This device features an integrated lowpass filter on the SCL and SDA digital lines to mitigate the effects of bus noise. Although this filtering makes communication robust in noisy environments, good layout practices are always recommended. Minimize noise coupling by keeping digital traces away from switching power supplies. Ensure that digital lines containing high-speed data cross at right angles to the SDA and SCL lines. Excessive noise coupling into the SDA and SCL lines on the device— specifically noise with amplitude greater than 400mV P-P (typical hysteresis), overshoot greater than 300mV above +VDD, and undershoot more than 300mV below GND— can prevent successful serial communication. Serial bus not-acknowledge is the most common symptom, causing unnecessary traffic on the bus. Care must be taken to ensure proper termination within a system with long PCB traces or multiple slaves on the bus. Resistance can be added in series with the SDA and SCL lines to further help filter noise and ringing. If it proves to be necessary, a 5k I resistor should be placed in series with the SCL line, placed as close as possible to the SCL pin. This 5kI resistor, with the 5pF to 10pF stray capacitance of the device provide a 6MHz to 12MHz lowpass filter, which is sufficient filtering in most cases.

Table 6. Configuration Register Fault

+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. PART TEMP RANGE RESET TIMEOUT ENABLED AT POR PIN-PACKAGE MAX30205MTA+ 0NC to +50NC No Yes 8 TDFN-EP* PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.

8 TDFN-EP T833+2 21-0137 90-0059

Ordering Information

Package Information

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. www.maximintegrated.com Maxim Integrated │ 14 MAX30205 Human Body Temperature Sensor

0 3/16 Initial release —

Revision History

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2016 Maxim Integrated Products, Inc. │ 15 MAX30205 Human Body Temperature Sensor For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.