mlx90314 Melexis Company, mlx90314 Datasheet - Page 13

• Manufacturer Part Number: mlx90314
• Description: Programmable Sensor Interface
• Manufacturer: Melexis Company

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
MLX902xx Name of Sensor Rev Y.X 22/Aug/98
3901090314
Rev 007
Output
Output
High
Low
Selected input
Figure 5.
Alarm Function
OUTPUT
GNO
VMO
TPO
IAO
IO1
IO2
Trigger
Low
Input Signal
MUX Value
MLX90314
Trigger
High
0010
0110
0000
0011
0100
0101
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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.
Programmable Sensor Interface
VBP
VBN
TMP
IO1
IO2
Bidirectional
Figure 6.
Alarm & Steering
Source Points
Figure 7. Level Steering
Function
IO1, IO2
(I02,I01)
OFC
Offset
& Amp
Sense
Temp
0 - 0
I/O
Level 1
IAO
FLT
0 - 1
TPO
COMS
UART
ADC
DAC
&
Gain
Level 2
VDD1 FET VDD GND
GNO
1 - 0
Power Supply
MLX90314
Microcontroller
Core, Memory,
Regulation
Reset,Test,&
EEPROM
Oscillator
MLX90314
Level 3
CM
VM
1 -1
Nov/04
CMO
VMO
TSTB
CMN