MLX90614ESF-BAA-000-TU

Part: MLX90614ESF-BAA-000-TU — Melexis

Type: Single and Dual Zone Infrared Thermometer (digital, TO-39)

Description: Factory-calibrated non-contact IR thermometer in a TO-39 can with a 17-bit ADC, SMBus and PWM outputs, 0.02°C resolution and ±0.5°C accuracy around room temperature. The BAA variant is the 3 V, single-zone version with the standard package.

Operating Conditions:

• Supply voltage: 3 V version (B), operating maximum 3.6 V per the Absolute Maximum Ratings table
• Operating temperature: -40 to +85 °C (E temperature code)
• Calibrated range: -40 to +125 °C for ambient, -70 to +380 °C for object temperature
• Interface: SMBus compatible (factory default at power-on reset) or 10-bit PWM

Absolute Maximum Ratings:

• Max supply voltage (MLX90614ESF-Bxx): 5 V (over-voltage); 3.6 V (operating)
• Reverse voltage: 0.4 V
• Max DC sink/source/clamp current, SDA/PWM pin: 25 mA
• Max DC clamp current, SCL pin: 25 mA
• Max DC current into SCL/Vz (Vz mode): 2 mA
• Storage temperature: -40 to +125 °C
• ESD sensitivity (AEC Q100 002): 2 kV

Key Specs:

• Object temperature calibration range: -70 to +380 °C; ambient: -40 to +125 °C
• Accuracy: ±0.5 °C around room temperature (0 to +50 °C for both Ta and To)
• Measurement resolution: 0.02 °C
• PWM: 10-bit, default period 1.024 ms (±10% over the full operating range), default range -20 to 120 °C with 0.14 °C resolution
• Output valid after power-on reset: 0.25 s typ (Axx table, VDD = 5 V, TA = 25 °C)
• Optical filter pass band: 5.5 to 14 μm
• Emissivity adjustable from 0.1 to 1.0 without blackbody recalibration
• Up to 127 sensors can be read on a common 2-wire bus

Features:

• Small size, low cost, easy to integrate
• Factory calibrated, with a high (medical) accuracy option
• Single and dual zone versions
• SMBus compatible digital interface
• Customizable PWM output for continuous reading
• PWM pin configurable as a thermal relay with a user-programmable threshold
• Available in 3 V and 5 V versions, adaptable to 8 to 16 V applications
• Sleep mode for reduced power consumption
• Integrated long-wave pass optical filter for sunlight immunity
• Automotive grade

Applications:

• High precision non-contact temperature measurement
• Thermal comfort sensing for air conditioning control
• Windshield defogging
• Automotive blind angle detection
• Industrial temperature control of moving parts
• Printers and copiers
• Home appliances
• Healthcare and body temperature measurement
• Livestock monitoring
• Movement detection
• Multi-zone temperature control
• Thermal relay and alert

Package:

• TO-39 (SF), 4 pins: SCL/Vz, SDA/PWM, VDD, VSS

• Small size, low cost
• Easy to integrate
• Factory calibrated in wide temperature range:
• -40°C…+125˚C for sensor temperature and -70°C…+380˚C for object temperature.
• High accuracy of 0.5°C in a wide temperature range (0°C…+50°C for both Ta and To)
• High (medical) accuracy calibration
• Measurement resolution of 0.02°C
• Single and dual zone versions
• SMBus compatible digital interface
• Customizable PWM output for continuous reading
• Available in 3V and 5V versions
• Simple adaptation for 8V…16V applications
• Sleep mode for reduced power consumption
• Different package options for applications and measurements versatility
• Automotive grade

Table 1: Absolute maximum ratings for MLX90614

Exceeding the absolute maximum ratings may cause permanent damage.

Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

The MLX90614 can be configured as a thermo relay with programmable threshold and hysteresis on the PWM/SDA pin. The input for the comparator unit of the relay is the object temperature from sensor 1

The output of the MLX90614 is NOT a relay driver but a logical output which should be connected to a relay driver if necessary.

The output driver is one and the same for PWM and Thermal relay. In order to configure the MLX90614 to work as thermal relay two conditions must be met:

• o Set bit TRPWMB high at address 0x02 in EEPROM
• o Enable PWM output i.e. EN_PWM is set high

The PWM / SDA pin can be programmed as a push-pull or open drain NMOS (via bit PPODB in EEPROM PWMCTRL), which can trigger an external device. The temperature threshold data is determined by EEPROM at address 0x21 (Tomin) and the hysteresis at address 0x020 (Tomax).

The logical state of the PWM/SDA pin is as follows:

PWM / SDA pin is high if hysteresis threshold TO + ≥ 1

PWM / SDA pin is low if hysteresis threshold TO -≤ 1

Figure 21: Thermal relay: 'PWM' pin versus Tobj

Single and Dual Zone Infra Red Thermometer in TO-39

The MLX90614 preserves its normal operation when configured as a thermal relay (PWM configuration and specification applies as a general rule also for the thermal relay) and therefore it can be read using the SMBus (entering the SMBus mode from both PWM and thermal relay configuration is the same).

For example, the MLX90614 can generate a wake-up alert for a system upon reaching a certain temperature and then be read as a thermometer. Reset conditions (enter and exit Sleep, for example) will be needed in order to return to the thermal relay configuration.