PIC16F1507-ESLASHSS. datasheet(113/278 Pages) MICROCHIP

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DS40001586D-page 113

PIC16(L)F1507

13.0

FIXED VOLTAGE REFERENCE

(FVR)

The Fixed Voltage Reference (FVR) is a stable voltage

reference, independent of VDD, with a nominal output

level (VFVR) of 1.024V. The output of the FVR can be

configured to supply a reference voltage to the

following:

• ADC input channel

The FVR can be enabled by setting the FVREN bit of

the FVRCON register.

13.1

Independent Gain Amplifier

The output of the FVR supplied to the peripherals, (listed

above), is routed through a programmable gain amplifier.

Each amplifier can be programmed for a gain of 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 15.0 “Analog-to-Digital Converter

(ADC) Module”

for additional information.

To minimize current consumption when the FVR is

disabled, the FVR buffers should be turned off by

clearing the Buffer Gain Selection bits.

13.2

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 the FVR Stabilization Period characterization

graph, Figure 26-48.

FIGURE 13-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

ADFVR<1:0>

FVR_buffer1

(To ADC Module)

1.024V Fixed

Reference

FVREN

FVRRDY

Rev. 10-000053B

8/2/2013

Note 1

TABLE 13-1:

PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)

Peripheral

Conditions

Description

HFINTOSC

FOSC<2:0> = 010 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 PIC16F1507 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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