PIC16F1513T-I/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1513T-I/SS

28-Pin Flash Microcontrollers with XLP Technology

Microchip Technology 

PIC16(L)F1512/3

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

• Comparator positive input

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 a programmable gain amplifier. The

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.

To minimize current consumption when the FVR is

disabled, the FVR buffers should be turned off by

clearing the Buffer Gain Selection bits.

FIGURE 14-1:

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.

VOLTAGE REFERENCE BLOCK DIAGRAM

ADFVR<1:0>

2

FVREN

Any peripheral requiring

the Fixed Reference

(See Table 14-1)

x1

x2

x4

1.024V Fixed

Reference

+

FVRRDY

-

FVR BUFFER1

(To ADC Module)

TABLE 14-1: PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)

Peripheral

Conditions

Description

HFINTOSC

BOR

LDO

FOSC<2:0> = 100 and

IRCF<3:0> = 000x

BOREN<1:0> = 11

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

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

All PIC16F1512/3 devices, when

VREGPM = 1 and not in Sleep

INTOSC is active and device is not in Sleep

BOR always enabled

BOR disabled in Sleep mode, BOR Fast Start enabled.

BOR under software control, BOR Fast Start enabled

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

mode.

 2012-2014 Microchip Technology Inc.

DS40001624C-page 119

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