I want turn on excitation current source 1, but it didn't work:
IEXCON = (BIT1+BIT3) + BIT7; // Enable Excitation Current Source 1 - 1000uA
please help me to make current 1 mA from IEXC 1.
As you have written & as explained in the data-sheet REV. B on page 53 in Table 62.
1mA output @ IEXC1 (pin 16 of ADuC7060)
IEXCON = (1 << 7) // Enable IEXC1 output
| (5 << 1); // 1mA excitation current
If it does not work, please check the disassembly what exactly is written into the MMR - should be 0x0000008A.
I,m sorry. This code is OK. MCU pin doesn't connect to board.
I'm trying to mesure temperature by Pt100 by scheme in datashit page 54. Then I incrise resistor value, Vref is change and current too. Is this right? And current is 810 uA.
Do you use the EVAL-ADUC7060 Board?
Keep in mind - referring to your question about 1mA => 1mA @ 2.5V AVDD => max. resistor <= 2.5k
" Do you use the EVAL-ADUC7060 Board? " - No. Resistor is 2,56 K. What do you advice to me, may be less current?
If topic starter doesn't mind i'll ask my question in current thread.
Can You explain to me Excitation Current Sources output compliance specifications please? Are there MIN and MAX VALUES reversed ? For comparison see attached screenshots from ADuC7060 and ADuC84X series datasheets. ADuC7060 datasheet revision B and C page 7 of 108, ADuC845 datasheet revision B page 7 of 108
Yes, this is a mistake - noted for correction in next revision...
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