PIC16LF1902-E/P301 데이터 시트보기 (PDF) - Microchip Technology

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PIC16LF1902-E/P301

28-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

PIC16LF1902/3

13.0 FIXED VOLTAGE REFERENCE

(FVR)

The Fixed Voltage Reference, or FVR, is a stable

voltage reference, independent of VDD, with 1.024V or

2.048V 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.

13.1 Independent Gain Amplifiers

The output of the FVR supplied to the ADC is routed

through two independent programmable gain

amplifiers. Each amplifier can be configured to amplify

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

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.

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

Section 21.0 “Electrical Specifications” for the

minimum delay requirement.

FIGURE 13-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

ADFVR<1:0>

2

x1

FVR BUFFER1

x2

(To ADC Module)

FVREN

Any peripheral requiring

the Fixed Reference

(See Table 13-1)

1.024V Fixed

Reference

+

FVRRDY

-

TABLE 13-1: PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)

Peripheral

Conditions

Description

HFINTOSC

BOR

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

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

 2011 Microchip Technology Inc.

Preliminary

DS41455A-page 109

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