PIC16F1933-ESLASHP datasheet(149/418 Pages) MICROCHIP

149 / 418 page

Preliminary

DS41364A-page 147

PIC16F193X/LF193X

12.8

Comparator Response Time

The comparator output is indeterminate for a period of

time after the change of an input source or the selection

of a new reference voltage. This period is referred to as

the response time. The response time of the comparator

differs from the settling time of the voltage reference.

Therefore, both of these times must be considered when

determining the total response time to a comparator

input change. See the Comparator and Voltage Refer-

ence Specifications in Section 28.0 “Electrical Specifi-

cations” for more details.

12.9

Interaction with ECCP Logic

The C1 and C2 comparators can be used as general

purpose comparators. Their outputs can be brought

out to the C1OUT and C2OUT pins. However, when

the ECCP Auto-Shutdown is active it can use one or

both comparators. If auto-restart is also enabled the

comparators can be configured as a closed loop

analog feedback to the ECCP thereby, creating an

analog controlled PWM.

12.10 Analog Input Connection

Considerations

A simplified circuit for an analog input is shown in

Figure 12-3. 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

Ω 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 12-3:

ANALOG INPUT MODEL

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.

2: Analog levels on any pin defined as a

digital input, may cause the input buffer to

consume more current than is specified.

Rs < 10K

CPIN

5 pF

VDD

≈ 0.6V

RIC

ILEAKAGE(1)

Vss

AIN

Legend: CPIN

= Input Capacitance

ILEAKAGE = Leakage Current at the pin due to various junctions

RIC

= Interconnect Resistance

= Source Impedance

= Analog Voltage

= Threshold Voltage

To Comparator

Note 1:

See Section 28.0 “Electrical Specifications”

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