Analog Mode
This box enables the chip to operate with a completely analog signal path from sensor input to
signal output. This provides the best accuracy however signal linearization is not available in
Analog Mode. Analog Mode is mutually exclusive with Digital Mode.
Digital Mode
Digital Mode breaks the signal path by converting the signal to digital data for manipulation by
the internal microcontroller. The signal is then converted back to analog before it is sent to the
output stage of the chip. Both the A to D and the D to A are 10 bits wide. Digital Mode allows
the processor to manipulate the data thus providing signal linearization. Digital Mode has a
smaller bandwidth than Analog Mode and some small quantization noise and error is typical.
Digital Mode is mutually exclusive with Analog Mode.
Level Steering
The Level Steering Mode uses the IO1 and IO2 pins as digital outputs to provide a 2 bit A to D
to an internal analog signal. The analog signal is chosen by the user for the Alarm/Level
Steering Source area of the dialog box. The trigger levels are also defined by the user and are
contained in the same part of the dialog box. This function is mutually exclusive with Alarm
Mode.
Alarm Mode
The Alarm Mode is used to force the output signal to a defined value when an input analog
signal exceeds a user defined range. The input analog signal is chosen from the Alarm/Level
Steering Source area of the dialog box. The defined range is between the upper trigger and the
lower trigger. If the chosen signal exceeds the upper trigger then the output is forced to the value
of the high output. If the chosen signal goes below the low trigger then the output is forced to
the level of the low output. This function is mutually exclusive with Level Steering Mode.
Internal Temp
This box selects the internal temperature sensor for temperature compensating the sensor. The
internal temperature sensor is mutually exclusive with the external temperature sensor.
External Temp
MLX90308CCC & MLX90314AB Software Users Manual
Rev 2.0
8
11/28/01