PIC12LF1501 datasheet(132/352 Pages) MICROCHIP

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PIC16(L)F1503

DS40001607D-page 132

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17.2.5

COMPARATOR OUTPUT POLARITY

Inverting the output of the comparator is functionally

equivalent to swapping the comparator inputs. The

polarity of the comparator output can be inverted by

setting the CxPOL bit of the CMxCON0 register.

Clearing the CxPOL bit results in a non-inverted output.

Table 17-2 shows the output state versus input

conditions, including polarity control.

17.2.6

COMPARATOR SPEED/POWER

SELECTION

The trade-off between speed or power can be opti-

mized during program execution with the CxSP control

bit. The default state for this bit is ‘1’ which selects the

Normal-Speed mode. Device power consumption can

be optimized at the cost of slower comparator propaga-

tion delay by clearing the CxSP bit to ‘0’.

17.3

Analog Input Connection

Considerations

A simplified circuit for an analog input is shown in

Figure 17-3. Since the analog input pins share their

connection with a digital input, they have reverse

biased ESD protection diodes to VDD and VSS. The

analog input, therefore, must be between VSS and VDD.

If the input voltage deviates from this range by more

than 0.6V in either direction, one of the diodes is for-

ward biased and a latch-up may occur.

A maximum source impedance of 10 k

 is recommended

for the analog sources. Also, any external component

connected to an analog input pin, such as a capacitor or

a Zener diode, should have very little leakage current to

minimize inaccuracies introduced.

FIGURE 17-3:

ANALOG INPUT MODEL

TABLE 17-2:

COMPARATOR OUTPUT

STATE VS. INPUT CONDITIONS

Input Condition

CxPOL

CxOUT

CxVN > CxVP

CxVN < CxVP

CxVN > CxVP

CxVN < CxVP

Note 1:

When reading a PORT register, all pins

configured as analog inputs will read as a

‘0’. Pins configured as digital inputs will

convert as an analog input, according to

the input specification.

Analog levels on any pin defined as a

digital input, may cause the input buffer to

consume more current than is specified.

RS < 10K

VDD

Analog

Input pin

CPIN

5pF

0.6V

ILEAKAGE

(1)

VSS

RIC

To Comparator

Legend: CPIN

= Input Capacitance

ILEAKAGE = Leakage Current at the pin due to various junctions

RIC

= Interconnect Resistance

= Source Impedance

= Analog Voltage

= Threshold Voltage

Rev. 10-000071A

8/2/2013

Note 1:

See Section 28.0 “Electrical Specifications”.

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