EFM32WG Datasheet, PDF (674/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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BIAS
0b0110
0b0111
0b1000
0b1001
0b1010
0b1011
0b1100
0b1101
0b1110
0b1111
HALFBIAS=0
1.2
1.4
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
Bias Current (µA)
HALFBIAS=1
0.6
0.7
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
27.3.3 Hysteresis
In the voltage supply comparator, hysteresis can be enabled by setting HYSTEN in VCMP_CTRL. When
HYSTEN is set, the digital output will not toggle until the positive input voltage is at least 20mV above
or below the negative input voltage. 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.
Figure 27.2. VCMP 20 mV Hysteresis Enabled
In _POS
In_NEG + 20m V
In _NEG
In_NEG -20m V
Tim e
VCMPOUT wit hout hyst eresis
VCMPOUT wit h hyst eresis
27.3.4 Input Selection
The positive comparator input is always connected to the scaled power supply input. The negative
comparator input is connected to the internal 1.25 V bandgap reference. The V_DD trigger level can be
configured by setting the TRIGLEVEL field in VCMP_CTRL according to the following formula:
VCMP V_DD Trigger Level
V_{DD Trigger Level}= 1.667V + 0.034V × TRIGLEVEL
(27.1)
A low power reference mode can be enabled by setting the LPREF bit in VCMP_INPUTSEL. In this mode,
the power consumption in the reference buffer (V_DD and bandgap) is lowered at the cost of accuracy.
27.3.5 Interrupts and PRS Output
The VCMP includes an edge triggered interrupt flag (EDGE in VCMP_IF). If either IRISE and/or IFALL in
VCMPn_CTRL is set, the EDGE interrupt flag will be set on rising and/or falling edge of the comparator
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
674
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