PIC10LF322T-EMCSQTP datasheet(85/210 Pages) MICROCHIP

85 / 210 page

 2011 Microchip Technology Inc.

Preliminary

DS41585A-page 85

PIC10(L)F320/322

12.0

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

The FVR can be enabled by setting the FVREN bit of

the FVRCON register.

12.1

Independent Gain Amplifiers

The output of the FVR supplied to the ADC is routed

through an independent 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 15.0 “Analog-to-Digital Converter

(ADC) Module”

for additional information.

12.2

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 24.0

“Electrical

Specifications”

for the

minimum delay requirement.

FIGURE 12-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

FVR

(To ADC Module)

1.024V Fixed

Reference

FVREN

FVRRDY

ADFVR<1:0>

Any peripheral requiring

the Fixed Reference

(See Table 12-1)

TABLE 12-1:

PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)

Peripheral

Conditions

Description

HFINTOSC

FOSC = 1

EC on CLKIN pin.

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.

IVR

All PIC10F320/322 devices, when

VREGPM1 = 1 and not in Sleep

The device runs off of the Power-Save mode regulator when

in Sleep mode.

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