Analogue input to LSD output
A fully calibratable electronic module which will convert an analogue input signal into Low Side Driver (LSD) outputs.
Calibration mapping of input signal to control switching of LSD outputs.
- Input range is 0 – 5 volt can be mapped to up to 10 LSD outputs.
- Linear sensors mapped to linear or complex non-linear outputs
How the module works – Input
The module input operating range is 0 to 5 volts analogue.
This input range is then converted to a digital value by dividing the range 0-5 into one of 1024 values.
Each digital valve is to equal 0.0049 of a volt or 4.9mV.
Input analogue to digital conversation:
Analog to Digital Converter (ADC)
10 – bit ADC
210 = 1024 (range = 0 - 1023 as zero is counted as a value)
Input resolution is 5 / 1024 = 0.0049
So
Digital valve 0 = 0V
Digital valve 1 = 4.9mV
Digital valve 2 = 9.8mV
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Digital valve 1023 = 5 V
The ADC converts the analogue input voltage to a highly accurate digital value which can be used with the programming of the module code.
How the module works – Output
The module output is the switching of up to 10 Low Side Drivers (LSD).
A LSD is a power circuit which is switched Low or switched to earth. An LSD is an switch to earth, or a switch in the earth side of the circuit.
The control of the LSD switch is done via the module calibration.
How the module works – Calibration
Mapping allows the input signal digital valves to be mapped to an output duty cycle percentage.
This mapping is done in C programming language but only a very low level of programming knowledge is required to modify the calibration.
For example:
Input digital value 250 – 350 set LSD No 1 to 'ON' & LSD No 2 - 10 to 'OFF'
Input digital value 351 – 450 set LSD No 1 & 2 to 'ON' & LSD No 3 - 10 to 'OFF'
Input digital value 451 – 550 set LSD No 1 & 2 & 3 to 'ON' & LSD No 4 - 10 to 'OFF'
Note:
There are 10 LSDs so mapping points will depend on how many LSD outputs are required.
Each of these operational instructions is independent allowing non linear output to liner input relationships to be established.