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26.3.2 Response Time
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There is a delay from when the actual input voltage changes polarity, to when the output toggles. This
period is called the response time and can be altered by increasing or decreasing the bias current to
the comparator through the BIASPROG, FULLBIASPROG and HALFBIAS fields in the ACMPn_CTRL
register, as described in Table 26.1 (p. 663) .Setting the HALFBIAS bit in ACMPn_CTRL effectively
halves the current as observed in Table 26.1 (p. 663) . Setting a lower bias current will result in lower
power consumption, but a longer response time.
If the FULLBIAS bit is set, the highest hysteresis level should be used to avoid glitches on the output.
Table 26.1. Bias Configuration
BIASPROG
0b0000
0b0001
0b0010
0b0011
0b0100
0b0101
0b0110
0b0111
0b1000
0b1001
0b1010
0b1011
0b1100
0b1101
0b1110
0b1111
FULLBIAS=0,
HALFBIAS=1
0.05
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Bias Current (µA)
FULLBIAS=0,
HALFBIAS=0
FULLBIAS=1,
HALFBIAS=1
0.1
3.3
0.2
6.5
0.4
13
0.6
20
0.8
26
1.0
33
1.2
39
1.4
46
2.0
65
2.2
72
2.4
78
2.6
85
2.8
91
3.0
98
3.2
104
3.4
111
FULLBIAS=1,
HALFBIAS=0
6.5
13
26
39
52
65
78
91
130
143
156
169
182
195
208
221
26.3.3 Hysteresis
In the analog comparator, hysteresis can be configured to 8 different levels, including off which is level
0, through the HYSTSEL field in ACMPn_CTRL. When the hysteresis level is set above 0, the digital
output will not toggle until the positive input voltage is at a voltage equal to the hysteresis level above
or below the negative input voltage (see Figure 26.2 (p. 664) ). This feature can be used to filter out
uninteresting input fluctuations around zero and only show changes that are big enough to breach the
hysteresis threshold.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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