CXD5602 User Manual
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868/1010
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The maximum value of cnt_out is 32767(2^15-1).
Since the SAMP_RATIO is directly connected from the register to the comparator for comparing the counter
value, when the software is changed, it is immediately reflected.
Counter reset is common to all four channels (reset cannot be done on a counter basis).
Dynamic update of the SAMP_RATIO is not considered (the specification is such that parameters are updated
when the internal counter is reset).
0
cnt_out
LPADC_DATAEN
1
2
3
0
1
2
3
0
1
2
SAMP_RATIO
2
LPADC_DATAEN_SMP
Figure SCU (Sensor Control Unit)-93 Counter Basic Operation
When a reset of the internal counter is not performed, and the sampling frequency is changed from low to high, a
large delay may occur.
The delay until the first datum can be extracted is as follows:
When the first time each channel of LPADC is started up
1/RPOST
(RPOST = RPRE) [seconds]
E.g.: When 256 Hz, approximately 3.9 ms
After the LPADC stops, startup with sampling frequency changed, not resetting the LPADC
In the case of sampling frequency change (High => Low) (SAMP_RATIO Low => High)
Maximum
1/RPOST
[seconds]
Minimum
1/RPOST – 1/RPRE + 1/RADC
[seconds]
In the case of sampling frequency change (Low => High) (SAMP_RATIO High => Low)
Minimum
1/RADC
[seconds]
Maximum
32768/RADC
[seconds]
E.g.: when 256 Hz, 128s
Here,
RADC: Sampling rate of LPADC (Hz)
RPRE: Sampling rate after decimation before change (Hz)
RPOST: Sampling rate after decimation after change (Hz)
Summary of Contents for CXD5602
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