PIC16F707-ESLASHML datasheet(89/284 Pages) MICROCHIP

89 / 284 page

 2010 Microchip Technology Inc.

Preliminary

DS41418A-page 89

PIC16F707/PIC16LF707

10.0 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

• Digital-to-Analog Converter (DAC)

• Capacitive Sensing Modules (CSM)

The FVR can be enabled by setting the FVREN bit of

the FVRCON register.

10.1

Independent Gain Amplifiers

The output of the FVR supplied to the ADC and

CSM/DAC modules is routed through the 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 9.0 “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 capacitive sensing and

digital-to-analog

converter

modules.

Reference

Section 16.0 “Capacitive Sensing Module” and

Section 11.0 “Digital-to-Analog Converter (DAC)

Module” for additional information.

10.2

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 25.0 “Electrical Specifications” for the

minimum delay requirement.

FIGURE 10-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

ADFVR<1:0>

CDAFVR<1:0>

FVR BUFFER1

(To ADC Module)

FVR BUFFER2

(To Cap Sense, DAC)

FVREN

FVRRDY

1.024V Fixed

Reference

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