MLX90308LDF データシートの表示（PDF） - Melexis Microelectronic Systems

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MLX90308LDF

Programmable Sensor Interface

Melexis Microelectronic Systems  

MLX90308CCC

Programmable Sensor Interface

Alarm Option

This option allows controlling the low and high limits of

the output (See Figure 5.). The output level is set

when the output tries to exceed the programmed

limits. Five bytes are reserved for this option. The first

byte is the low trigger limit and the second the low

output. The third and fourth bytes are used for the high

limit and the output. The fifth byte is the alarm control,

used to select the alarm input. The different levels are

programmed as eight bit numbers. These correspond

to the 8 upper bits of the 10 bit signal measurement.

When the alarm mode is not used, all of the data is 0.

The control code is coded as shown in Table 7. The

six possible signals are listed below and are encoded

on the 4 MSB’s of byte 31 of the EEPROM.

Table 7. Alarm Source Bit Definition

Selected input

TPO

IAO

GNO

VMO

IO1

IO2

MUX Value

0010

0110

0000

0011

0100

0101

IO1 & IO2

IO1 and IO2 are used in the alarm and level steering

modes. For custom firmware, they can be used for a

digital input, an analog input, or a digital output.

Figure 6.

Alarm & Steering

Source Points

VBP

VBN

OFC

FLT

IAO

Offset

VDD1 FET VDD GND

Power Supply

Regulation

GNO

Gain

VM

VMO

TPO

TMP

Temp

Sense

& Amp

IO1

IO2

Bidirectional

I/O

ADC

&

DAC

UART

CM

CMO

CMN

Microcontroller

Core, Memory,

EEPROM

Reset,Test,&

Oscillator

TSTB

Figure 5.

COMS

Alarm Function

OUTPUT

High

Output

MLX90308

Figure 7. Level Steering

Function

IO1, IO2

MLX90308

1 -1

1-0

Low

Output

Low

Trigger

Input Signal

High

Trigger

M39L0X190029x0x3N08ame of Sensor Rev Y.X 22/Aug/98

Rev 004

Page P13age 13

0-1

0-0

(I02,I01)

Level 1

Level 2

Level 3

Aug/02

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