NRF52820-QDAA-R datasheet(111/437 Pages) NORDIC

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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 37: Comparator in differential mode

Note: 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 the HYST register is turned on during this mode, the output of the comparator and associated

events do the following:

• Change from ABOVE to BELOW when VIN+ drops below VIN- - (VDIFFHYST/2)

• Change from BELOW to ABOVE when VIN+ raises above VIN- + (VDIFFHYST/2)

This behavior is illustrated in the following figure.

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 38: Hysteresis enabled in differential mode

4463_156 v1.0

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NRF52820-QDAA-R Datasheet(PDF) 111 Page - Nordic Semiconductor

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