PIC16F1934-ESLASHML datasheet(157/418 Pages) MICROCHIP

157 / 418 page

Preliminary

DS41364A-page 155

PIC16F193X/LF193X

14.0

FIXED VOLTAGE REFERENCE

The Fixed Voltage Reference, or FVR, is a stable

voltage reference, independent of VDD, with 1.024V,

2.048V or 4.096V selectable output levels. The output

of the FVR can be configured to supply a reference

voltage to the following:

• ADC input channel

• ADC positive reference

• Comparator positive input

• Programmable voltage reference

• LCD bias generator

The FVR can be enabled by setting the FVREN bit of

the FVRCON register.

14.1

Independent Gain Amplifiers

The output of the FVR supplied to the ADC and

comparator

modules

routed

through

two

independent programmable gain amplifiers. Each

amplifier can be configured to amplify the reference

voltage by 1x, 2x or 4x.

The ADFVR<1:0> bits of the FVRCON register are

used to enable and configure the gain amplifier settings

for the reference supplied to the ADC module. Refer-

ence

Section 11.0

“Analog-to-Digital

Converter

(ADC) Module” for additional information on selecting

the appropriate input channel.

The CDAFVR<1:0> bits of the FVRCON register are

used to enable and configure the gain amplifier settings

for the reference supplied to the comparator module.

Reference Section 12.0 “Comparator Module” for

additional information on selecting the appropriate

input channel.

14.2

FVR Stabilization Period

When the fixed voltage reference module is enabled, it

requires time for the reference and amplifier circuits to

stabilize. Once the circuits stabilize and are ready for use,

the FVRRDY bit of the FVRCON register will be set. See

Section 28.0

“Electrical

Specifications”

for

the

minimum delay requirement.

FIGURE 14-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

FIGURE 14-2:

VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE

ADFVR<1:0>

CDAFVR<1:0>

FVR_BUFFER1

(To ADC Module)

FVR_BUFFER2

(To Comparators, DAC)

FVR_VREF

(To LCD Bias Generator)

FVREN

FVRRDY

1.024V Fixed

Reference

Buffered CVREF Output

–

CVREF

Module

Voltage

Reference

Output

Impedance

CVREF

PIC16F193X/

PIC16LF193X

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