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MLX90308CCC Datasheet(PDF) 14 Page - Micro Electronics

Part # MLX90308CCC
Description  Programmable Sensor Interface
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Manufacturer  MICRO-ELECTRONICS [Micro Electronics]
Direct Link  http://www.microelectr.com.hk
Logo MICRO-ELECTRONICS - 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
7
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).
6
0 = Analog Mode
1 = Digital Mode
Digital mode must be activated when VMO and CMO
both active.
5
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
4
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.
3
0 = Turbo inactive
1 = Turbo active
2
0 = VMO inactive
1 = VMO active
1
0 = Internal temperature sensor active
1 = External temperature sensor
active
0
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
be
used
simultaneously.
Four
bytes
in
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
be
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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