NRF52811-QCAA-R7 datasheet(99/444 Pages) NORDIC

99 / 444 page

Peripherals

6.5.1 Differential mode

In differential mode, the reference input VIN- is derived directly from one of the AINx pins.

Before enabling the comparator via the ENABLE register, the following registers must be configured for the

differential mode:

• PSEL

• MODE

• EXTREFSEL

Comparator

core

MODE

MUX

VIN+

PSEL

EXTREFSEL

RESULT

Output

0 = BELOW (VIN+ < VIN-)

1 = ABOVE (VIN+ > VIN-)

MUX

VIN-

Figure 34: Comparator in differential mode

Restriction: Depending on the device, not all the analog inputs may be available for each MUX. See

definitions for PSEL and EXTREFSEL for more information about which analog pins are available on a

particular device.

When HYST register is turned on while in this mode, the output of the comparator (and associated events)

will change from ABOVE to BELOW whenever VIN+ becomes lower than VIN- - (VDIFFHYST / 2). It will also

change from BELOW to ABOVE whenever VIN+ becomes higher than VIN- + (VDIFFHYST / 2). This behavior is

illustrated in Hysteresis enabled in differential mode on page 99.

VIN+

BELOW

(VIN+ < (VIN- - VDIFFHYST /2))

ABOVE

(VIN+ > (VIN- + VDIFFHYST /2))

BELOW

ABOVE

(VIN+ > (VIN- + VDIFFHYST /2))

VIN- - (VDIFFHYST / 2)

VIN- + (VDIFFHYST / 2)

Output

Figure 35: Hysteresis enabled in differential mode

6.5.2 Single-ended mode

In single-ended mode, VIN- is derived from the reference ladder.

4454_140 v1.0

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