MLX90313

Programmable IR Sensor Interface

MLX90313 Programmable IR sensor Interface

Page 1

Rev 1.0 21-July-2001

3901090313

Features and Benefits

Dual low noise, low offset, fully programmable amplifier chain

12 bit on-chip ADC

Powerful signal conditioning and linearisation unit

Multiple output options: 12 bit digital through SPI, 8 bit resolution analog linear signal outputs or

10 bit PWM, both for ambient and object temperature.

On-chip programmable digital moving average LPF for ultimate low noise performance

ISP I/O-configuration and analog settings, accessible by SPI serial interface.

Wide supply voltage range from 4.5V-80V

Applications

Thermopile + thermistor amplification chain

Digital or analog, linear, ambient-compensated IR sensor interface

General purpose programmable sensor amplifier/ signal conditioner

Ordering Information

Part No.

Temperature Suffix

Package

Temperature Range

MLX90313

K

DF

-40C to 125C Automotive

Functional Diagram

Description

The MLX90313 is a versatile in-circuit

programmable interface, which performs signal

conditioning, linearisation and ambient

temperature compensation, particularly for

infrared sensors combined with a thermistor.

Other types of sensors can also be used in

various configurations. Sensors that can be used

include pressure sensors, strain gauges,

acceleration sensors etc.

The amplifier chains in MLX90313 are

programmable in very broad ranges of gain.

Both chains consist of high performance,

chopper-stabilized amplifiers, providing excellent

noise performance and low offset. The I/O

configuration as well as analog settings are in-

circuit programmable by means of the SPI-serial

interface. This serial link can also be used to

read out the output signals digitally. The circuit

can either provide linear analog or PWM (Pulse

Width Modulated) signal outputs. Additional the

circuit can perform simple control applications

using on-board comparators

PGA

PGA

A/D

12Bit

A/D

12Bit

pwm

lin

non

lin

pwm

lin

non

lin

Configuration eeprom

Digital Control Logic

SPI

interface

IR path

Thermistor

path

IR+

Tinp

Tinn

IRout

Tempout

IR-

SPI

interface

Supply Regulator