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 Post subject: ADC- analog to digital converter
PostPosted: Mon Mar 02, 2015 5:39 pm 
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Joined: Sat May 11, 2013 9:52 am
Posts: 304
Location: Over here, doing 'over here' things.
ADC is the analog to digital conversion module used in the processor, which the TMS570LS1224 used on the LAUNCHXL2 board have two of.
The main features of the module are:
• Selectable 10-bit or 12-bit resolution
• Successive-approximation-register architecture
• Three conversion groups – Group1, Group2 and Event Group
• All three conversion groups can be configured to be hardware-triggered; group1 and group2 can also be triggered by software
• Conversion results are stored in a 64-word memory (SRAM)
– These 64 words are divided between the three conversion groups and are configurable by software
– Accesses to the conversion result RAM are protected by parity
• Flexible options for generating DMA requests for transferring conversion results
• Selectable channel conversion order
– Sequential conversions in ascending order of channel number, OR
– User-defined channel conversion order with the Enhanced Channel Selection Mode
• Single or continuous conversion modes
• Embedded self-test logic for input channel failure detection (open / short to power / short to ground)
• Embedded calibration logic for offset error correction
• Enhanced Power-down mode
• External event pin (ADEVT) to trigger conversions
– ADEVT is also programmable as general-purpose I/O
• Eight hardware events to trigger conversions
The two instances of the 12-bit ADC modules on the microcontroller share 16 analog input channels.

In addition, the ADC modules are 5v0 compatible, which should make interfacing to common, off the shelf sensors for automotive use fairly simple since voltage level conversion wouldn't be necessary.

I like the idea of the conversion groups. This means frequently sampled sensors like MAP and TPS, and system voltages used for compensation factors, could be put in one group while less frequently sampled sensors like air and coolant temp and O2 could be put into another, then the respective group can be called for as necessary based on crankshaft position or on demand or even scheduled by a timer.

/me goes off to the corner feeling like Jerry Springer with a mullet.

My O5E candidate: 1982 Honda CX500TC motorcycle.

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