SN8F5708 datasheet(111/204 Pages) SONIX

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SN8F5708 Series

Comparator

Datasheet Rev. 2.4

111

17 Comparator

The microcontroller builds in two comparator functions. When the positive input voltage is greater

than the negative input voltage, the comparator output is high. When the positive input voltage is

smaller than the negative input voltage, the comparator output is low. Comparator positive voltage

is from internal 2V/3V/4V or CMnP. There is a programmable direction function to decide

comparator trigger edge for indicator function. The comparator has flag indicator, interrupt

function and IDLE Mode weak-up function for different application.

CMnO Pin

CMnG[1:0]

CMnOUT flag

CMnF

Vdd

Vss

V+

V-

CMnP Pin

CMnN Pin

CMnEN/

CMnOEN

CMnEN

Internal reference

voltage source

00=2V

01=3V

10=4V

CMnS[1:0]

17.1

Configurations of Operation

The Comparator pins are shared with GPIO controlled by CMnEN bit. When CMnEN=1,

CMnN/CMnP pin is enabled connected to Comparator negative terminal. CMnOEN controls

Comparator output connected to GPIO or not. When CMnOEN=1, Comparator output terminal is

connected to GPIO pins and isolate GPIO function.

The internal reference has three steps including 2V/3V/4V controlled by CMnS[1:0] bits.

Comparator pins configuration table is as following.

Comparator

N0.

CMnEN

Comparator

Negative

Comparator Positive Pin

(CMnS[1:0])

Comparator Output Pin

(CMnOEN)

CMP0

CM0EN=0

All pins are GPIO mode. Comparator is disabled.

CM0EN=1

CM0N

CM0P

GPIO

CM0O

CMP1

CM1EN=0

All pins are GPIO mode. Comparator is disabled.

CM1EN=1

CM1N

CM1P

GPIO

CM1O

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