36.5.4.4 Power control
The ADC module remains in its Idle state until a conversion is initiated. The Idle state
implies that ADC conversion routine is held in reset.
36.5.4.5 Sample time and total conversion time
The total conversion time depends upon:
• The sample time as determined by CFG2[SMPLTS]
• The MCU bus frequency
• The conversion mode, as determined by CFG1[MODE]
• The frequency of the conversion clock, that is, f
ADCK
.
After the module becomes active, sampling of the input begins.
1. CFG2[SMPLTS] selects between sample times based on the conversion mode that is
selected.
2. When sampling is completed, the converter is isolated from the input channel and a
successive approximation algorithm is applied to determine the digital value of the
analog signal.
3. The result of the conversion is transferred to Rn upon completion of the conversion
algorithm.
The maximum total conversion time is determined by the clock source chosen and the
divide ratio selected. The clock source is selectable by CFG1[ADICLK], and the divide
ratio is specified by CFG1[ADIV]. To calculate total conversion time the following
formula is applied:
ADC TOTAL CONVERSION TIME = Sample Phase Time (set by 1) + Hold
Phase (1 ADC Cycle) + Compare Phase Time (8-bit Mode=20 ADC Cycles, 10-bit
Mode=24 ADC Cycles, 12-bit Mode=28 ADC Cycles) + Single or First continuous time
adder (5 ADC 5 bus clock cycles)
36.5.4.6 Hardware average function
The hardware average function can be enabled by setting SC3[AVGE]=1 to perform a
hardware average of multiple conversions. The number of conversions is determined by
the AVGS[1:0] bits, which can select 4, 8, 16, or 32 conversions to be averaged. While
the hardware average function is in progress, SC2[ADACT] will be set.
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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NXP Semiconductors
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