MLX90614红外温度计芯片：高精度非接触测温解决方案

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"MLX90614是一款专用于非接触式温度测量的红外温度计芯片，将红外热电堆探测器与信号调理ASSP集成在同一TO-39封装中。这款芯片拥有低噪声放大器、17位ADC以及内置的DSP单元，确保了高精度和分辨率的温度读数。其出厂时已完成数字脉冲宽度调制和SMBus校准，10位PWM配置可提供在-20...120°C范围内的连续温度测量，分辨率为0.14°C，而默认的POR设置为SMBus接口。该芯片适用于广泛的温度测量应用，如汽车、工业和建筑空调系统等。" MLX90614是Melexis公司推出的一款高效能、低成本的红外温度传感器，主要特点包括： 1. **小型化设计**：MLX90614芯片体积小，易于整合到各种设备中。 2. **宽温范围校准**：传感器自身的工作温度范围为-40...+125°C，测量物体温度范围可达-70...+380°C，确保在不同环境下都能稳定工作。 3. **高精度**：在0...+50°C的温度区间内，无论是环境温度(Ta)还是目标温度(To)，精度均可达0.5°C，适合对精度要求高的应用。 4. **高分辨率**：通过17位ADC，测量分辨率高达0.02°C，提供非常精确的温度数据。 5. **单区和双区版本**：根据需求，MLX90614有单个测量区域和两个独立测量区域的版本，适应不同的应用场景。 6. **SMBus兼容的数字接口**：采用SMBus接口，便于与系统进行通信，简化了系统集成。 7. **可定制的PWM输出**：用户可以根据需求定制PWM输出，实现连续温度读取。 8. **电压版本多样**：提供3V和5V两种电压版本，同时支持简单适配8...16V的应用。 9. **节能模式**：具备睡眠模式，降低功耗，适用于能源效率要求高的系统。 10. **多样化封装选择**：多种封装选项增加了应用的灵活性和测量的多样性。 11. **汽车级品质**：符合汽车行业的严格标准，适用于车载应用。应用实例包括但不限于： - **高精度非接触式温度测量**：如医疗设备、精密仪器等。 - **移动空调的热舒适度传感器**：用于控制车内温度和湿度。 - **建筑空调系统的温度感应元件**：住宅、商业和工业建筑的自动调节。 - **风挡除雾**：监测并控制汽车风挡玻璃的温度，提高驾驶安全性。 - **汽车盲区检测**：通过检测车体周围的温度变化，辅助驾驶员识别盲区。 - **工业温度控制**：监控和控制各种工业生产过程中的温度。 MLX90614是一款极具竞争力的红外温度测量解决方案，尤其适合需要高精度、低功耗和易于集成的非接触式温度测量场合。

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

3901090614 Page 9 of 52 Data Sheet

Rev 009 June 29, 2015

Parameter Symbol Test Conditions Min Typ Max Units

SMBus compatible 2-wire interface

Input high voltage V

(Ta,V) Over temperature and supply VDD-0.1

Input low voltage V

(Ta,V) Over temperature and supply 0.6 V

Output low voltage V

Over temperature and supply,

Isink = 2mA

0.25 V

SCL leakage I

SCL

,leak V

SCL

=3V, Ta=+85°C 20 µA

SDA leakage I

SDA

,leak V

SDA

=3V, Ta=+85°C 0.25 µA

SCL capacitance C

SCL

10 pF

SDA capacitance C

SDA

10 pF

Slave address SA Factory default 5A hex

Wake up request t

wake

SDA low 33 ms

SMBus Request t

REQ

SCL low 1.44 ms

Timeout,low T

imeout,L

SCL low 27 33

Timeout, high T

imeout,H

SCL high 45 55

µs

Acknowledge setup time Tsuac(MD) 8-th SCL falling edge, Master 1.5 µs

Acknowledge hold time Thdac(MD) 9-th SCL falling edge, Master 1.5 µs

Acknowledge setup time Tsuac(SD) 8-th SCL falling edge, Slave 2.5 µs

Acknowledge hold time Thdac(SD) 9-th SCL falling edge, Slave 1.5 µs

EEPROM

Data retention Ta = +85°C 10 years

Erase/write cycles Ta = +25°C 100,000 Times

Erase/write cycles Ta = +125°C 10,000 Times

Erase cell time Terase 5 ms

Write cell time Twrite 5 ms

Table 4: Electrical specification MLX90614Bxx, Dxx

Note: refer to MLX90614Axx notes.

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

3901090614 Page 10 of 52 Data Sheet

Rev 009 June 29, 2015

8 Detailed description

8.1 Block diagram

Figure 3: Block diagram

8.2 Signal processing principle

The operation of the MLX90614 is controlled by an internal state machine, which controls the

measurements and calculations of the object and ambient temperatures and does the post-processing of the

temperatures to output them through the PWM output or the SMBus compatible interface.

The ASSP supports 2 IR sensors (second one not implemented in the MLX90614xAx).The output of the

IR sensors is amplified by a low noise low offset chopper amplifier with programmable gain, converted by a

Sigma Delta modulator to a single bit stream and fed to a powerful DSP for further processing. The signal is

treated by programmable (by means of EEPROM contend) FIR and IIR low pass filters for further reduction of

the band width of the input signal to achieve the desired noise performance and refresh rate. The output of the

IIR filter is the measurement result and is available in the internal RAM. 3 different cells are available: One for

the on-board temperature sensor and 2 for the IR sensors.

Based on results of the above measurements, the corresponding ambient temperature Ta and object

temperatures To are calculated. Both calculated temperatures have a resolution of 0.01˚C. The data for Ta and

To can be read in two ways: Reading RAM cells dedicated for this purpose via the 2-wire interface (0.02°C

resolution, fixed ranges), or through the PWM digital output (10 bit resolution, configurable range).

In the last step of the measurement cycle, the measured Ta and To are rescaled to the desired output

resolution of the PWM) and the recalculated data is loaded in the registers of the PWM state machine, which

creates a constant frequency with a duty cycle representing the measured data.

81101

OPA

ADC

DSP PWM

STATE MACHINE

t°

Voltage

Regulator

90302

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

3901090614 Page 11 of 52 Data Sheet

Rev 009 June 29, 2015

8.3 Block description

8.3.1 Amplifier

A low noise, low offset amplifier with programmable gain is used for amplifying the IR sensor voltage.

By carefully designing the input modulator and balanced input impedance, the max offset of the system is

0.5µV.

8.3.2 Supply regulator and POR

The module can operate from 3 different supplies:

VDD = 5V  MLX90614Axx

VDD = 3.3V  MLX90614Bxx (battery or regulated supply)

VDD = 8…16V  MLX90614Axx few external components are necessary please refer to “Applications

information” section for information about adopting higher voltage supplies.

The Power On Reset (POR) is connected to Vdd supply. The on-chip POR circuit provides an active (high) level

of the POR signal when the Vdd voltage rises above approximately 0.5V and holds the entire MLX90614 in

reset until the Vdd is higher than the specified POR threshold V

POR

. During the time POR is active, the POR

signal is available as an open drain at the PWM/SDA pin. After the MLX90614 exits the POR condition, the

function programmed in EEPROM takes precedence for that pin.

8.3.3 EEPROM

A limited number of addresses in the EEPROM memory can be changed by the customer. The whole

EEPROM can be read through the SMBus interface.

EEPROM (32X16)

Name Address Write access

max

0x00 Yes

min

0x01 Yes

PWMCTRL 0x02 Yes

Ta range

0x03 Yes

Emissivity correction coefficient 0x04 Yes

Config Register1 0x05 Yes

Melexis reserved 0x06 No

… … …

Melexis reserved 0x0D No

SMBus address (LSByte only) 0x0E Yes

Melexis reserved 0x0F Yes

Melexis reserved 0x10 No

… … …

Melexis reserved 0x18 No

Melexis reserved 0x19 Yes

Melexis reserved 0x1A No

Melexis reserved 0x1B No

ID number 0x1C No

ID number 0x1D No

ID number 0x1E No

ID number 0x1F No

Table 5: EEPROM table

The addresses To

max

, To

min

and Ta range are for customer dependent object and ambient temperature

ranges. For details see section 8.5.3 below in this document

The address Emissivity contains the object emissivity (factory default 1.0 = 0xFFFF), 16 bit.

Emissivity = dec2hex[ round( 65535 x

) ]

Where dec2hex[ round( X ) ] represents decimal to hexadecimal conversion with round-off to nearest value (not

truncation). In this case the physical emissivity values are

= 0.1…1.0.

Erase (write 0) must take place before write of desired data is made.

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