PIC16F1526 datasheet(145/354 Pages) MICROCHIP

145 / 354 page

 2011 Microchip Technology Inc.

Preliminary

DS41458A-page 145

PIC16(L)F1526/27

14.0

FIXED VOLTAGE REFERENCE

(FVR)

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

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 module is

routed through two independent programmable gain

amplifiers. Each amplifier can be configured to amplify

the reference voltage by 1x, 2x or 4x, to produce the

three possible voltage levels.

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 16.0 “Analog-to-Digital Converter

(ADC) Module”

for additional information.

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 25.0

“Electrical

Specifications”

for the

minimum delay requirement.

FIGURE 14-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

FVR BUFFER1

(To ADC Module)

1.024V Fixed

Reference

FVREN

FVRRDY

ADFVR<1:0>

Any peripheral requiring

the Fixed Reference

(See Table 14-1)

TABLE 14-1:

PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)

Peripheral

Conditions

Description

HFINTOSC

FOSC<2:0> = 100 and

IRCF<3:0> = 000x

INTOSC is active and device is not in Sleep.

BOR

BOREN<1:0> = 11

BOR always enabled.

BOREN<1:0> = 10 and BORFS = 1

BOR disabled in Sleep mode, BOR Fast Start enabled.

BOREN<1:0> = 01 and BORFS = 1

BOR under software control, BOR Fast Start enabled.

LDO

All PIC16F1526/27 devices, when

VREGPM = 1 and not in Sleep

The device runs off of the low-power regulator when in Sleep

mode.

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