APX-3302 User's Manual (OM110000019A)
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6.6
The noise rejection function of external input signal
APX-3302 carries the noise rejection circuit of external trigger in each channel.
It is possible to cover a digital filter over the selected external trigger, and to remove a single noise and the
noise at the time of level variation.
Input
Ignore
Output
Ignore
Filter time (L)
Filter time (H)
The timing that accept external trigger
Figure6-15: Noise rejection of external trigger
Noise rejection time can be set up per uS.
On the specification of a digital filter,
Keep in mind that the delay for filter settling time occurs in an output.
■
The setting example for software
The sample code that set external trigger noise removing time High and Low as 100us is as follows.
<Sample code>
// Configure noise rejection time as 100us.
AcapSetInfo(hDev, INPUT_CH, ACL_EXT_CHATTER, -1, 100);
// Configure external trigger period (the same value for High and Low period)
AcapSetInfo(hDev, INPUT_CH, ACL_EXT_CHATTER_SEPARATE, -1, 0);
// Reflect setting
AcapReflectParam(hDev, INPUT_CH)
Summary of Contents for APX-3302
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