MLX90308CCC datasheet(13/26 Pages) MICRO-ELECTRONICS

13 / 26 page

MLX902xx Name of Sensor

Rev Y.X

22/Aug/98

Page 13

MLX90308CCC

Programmable Sensor Interface

MLX90308CCC Programmable Sensor Interface

Page 13

Rev 2.2

23/Oct/01

Figure 5.

Alarm Function

OUTPUT

Input Signal

MLX90308

Low

Output

Low

Trigger

High

Trigger

High

Output

Selected input

MUX Value

TPO

0010

IAO

0110

GNO

0000

VMO

0011

IO1

0100

IO2

0101

Table 7. Alarm Source Bit Definition

Figure 6.

Alarm & Steering

Source Points

VMO

CMO

CMN

TSTB

Gain

Offset

Power Supply

Regulation

Temp

Sense

& Amp

Bidirectional

I/O

ADC

DAC

UART

Microcontroller

Core, Memory,

EEPROM

Reset,Test,&

Oscillator

OFC

FLT

VDD1 FET VDD GND

COMS

IO2

IO1

TMP

VBN

VBP

IAO

GNO

TPO

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

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.

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

Figure 7. Level Steering

Function

IO1, IO2

MLX90308

Level 1

1 -1

1 - 0

0 - 1

0 - 0

(I02,I01)

Level 2

Level 3

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