MLX90314ABLLW datasheet(7/26 Pages) ETC

7 / 26 page

MLX902xx Name of Sensor

Rev Y.X

22/Aug/98

Page 7

MLX90314AB

Programmable Sensor Interface

MLX90314AB Programmable Sensor Interface

Page 7

Rev 2.2

23/Oct/01

Table 2. Absolute Maximum Ratings

Supply voltage (ratiometric) VDD Max

Supply voltage (ratiometric) VDD Min

4.5V

Supply voltage (operating), VDD1 Max

35V

Reverse voltage protection

-0.7V

Supply current, Current Mode, IDD

3.5mA

Supply current, Voltage Mode, IDD

4.5mA

Output current, IVMO

8mA

Output current (short to VDD), ISCVMO

100mA

Output current (short to VSS), ISCVMO

8mA

Output voltage, VVMO

+11V

Power dissipation, PD

71mW

Operating temperature range, TA

-40 to +140°

Storage temperature range, TS

-55 to +150°C

Maximum junction temperature, TJ

150°C

Unique Features

Customization

Melexis can customize the MLX90314 in both

hardware and firmware for unique requirements.

The hardware design provides 64 bytes of RAM, 3

kbytes of ROM, and 48 bytes of EEPROM for use

by the firmware.

Special Information

The output of the sensor bridge is amplified via

offset and gain amplifiers and then converted to the

correct output signal form in one of the output

stages.

The sensitivity and offset of the analog signal chain

are defined by numbers passed to the DAC

interfaces from the microcontroller core (GN[9:0]

and OF[9:0]). The wide range of bridge offset and

gain is accommodated by means of a 2-bit coarse

adjustment DAC in the offset adjustment (CSOF

[1:0]), and a similar one in the gain adjustment

(CSGN[2:0]). The signal path can be directed

through the processor for digital processing. Two I/

O pins are available for analog inputs or digital

outputs. These pins can be used for alarms on

various points on the analog signal path and built-in

or external temperature values.

Programming and Setup

The

MLX90314

needs

have

the

compensation coefficients programmed for a

particular bridge sensor to create the sensor

system. Programming the EEPROM involves

some

minimal

communications

interface

circuitry, Melexis’ setup software, and a PC.

The

communications

interface

circuitry

available in a development board. This circuitry

communicates with the PC via a standard RS-

232 serial communications port.

Cross Reference

There are no known devices which the MLX

90314AB can replace.

ESD Precautions

Observe standard ESD control procedures for

CMOS semiconductors.

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