Page 8
Input Connections
Page 8
Blue Chip Technology Ltd.
01271014.doc
i.
Write the require channel number (0-15) out to Base + 12.
ii.
Start conversion by reading Base + 2 (the resultant data can be
discarded).
iii.
Read Base + 0 until bit 7 goes high indicating end of
conversion. (In basic or other slow languages it is not
necessary to perform this step as conversion only takes 10
microseconds).
iv.
Read Base + 1 for the 4 MSB of the high byte result. (This
MUST be read before the low byte otherwise another
conversion is triggered. The card automatically puts 0’s into
the 4 low bits).
v.
Read Base + 2 for the low byte result.
vi.
Combine the 8 and 4 bits to get the 12 bit result.
4.1.1
Analogue Input Options
The analogue input options on the ADC are as follows:
i.
Input Mode - Single Ended/Differential.
ii.
Differential Mode Termination.
iii.
Input Range - 0-5, 0-10V.
