MLX90308CCC datasheet(14/26 Pages) MICRO-ELECTRONICS

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MLX90308CCC

Programmable Sensor Interface

MLX90308CCC Programmable Sensor Interface

Page 14

Rev 2.2

23/Oct/01

Bit

Function

Remarks

1= EEPROM Checksum test active

0= EEPROM Checksum test inactive

EEPROM Checksum test. Checksum test failure will

force the output to the value programmed in bytes 40

and 41 of the EEPROM (See Table 10).

0 = Analog Mode

1 = Digital Mode

Digital mode must be activated when VMO and CMO

both active.

0 = Alarm function inactive

1 = Alarm function active

Alarm functions are like “limiting functions”:

If defined ADC INPUT is below low alarm trigger,

then DIGMOD becomes active with alarm low

output).

If defined ADC INPUT is above high alarm trigger,

then DIGMOD becomes active with alarm high

output.

Note: Deactivated if the level steering mode is active

0 = IO1/IO2 are not active outputs

1 = level steering: IO1/IO2 are active

outputs

Depending on the sampled input, IO1/IO2 will be a

two bit digital output. If IO1/IO2 are not active

outputs, then they will be analog inputs.

0 = Turbo inactive

1 = Turbo active

0 = VMO inactive

1 = VMO active

0 = Internal temperature sensor active

1 = External temperature sensor

active

0 = CMO inactive

1 = CMO active

CMO has fixed digital value (EEPROM byte - see

below) if both VMO and CMO are active. To activate

this value, the digital mode must be activated.

Table 9. Mode Byte Bit Definition

Level Steering

The level steering option allows configuration of the

IO pins as outputs to indicate the relative level of a

selected signal. See Figure 7. The levels at which

the two outputs change state are programmed by

the user. The programmed levels are set as eight bit

numbers and compared to the upper eight bits of

the digitized signal. This function utilizes the same

resources as the alarm function. The two functions

(level

steering

and

alarm)

can

not

used

simultaneously.

Four

bytes

the

EEPROM

command this option. The first byte is used to select

the input, while the last three comprise the transition

levels. The control byte for the level steering is the

same as for the alarm. The four MSB’s hold the

code for the selected input. The control byte has

several possibilities as designated by the MUX

settings (See Table 8)

Communications

The MLX90308 firmware transfers a complete byte

of data into and from the memory based on a

simple command structure. The commands allow

data to be read and written to and from the

EEPROM and read from the RAM. RAM data that

can

read

includes

the

current

digitized

temperature and digitized GNO. The commands are

described below. Melexis provides setup software

for programming the MLX90308.

Selected input

MUX Value

TPO

0010

IAO

0110

GNO

0000

VMO

0011

Table 8. Level Steering Bit Definitions

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